State system profile

PFAS in California drinking water

Active community water systems with complete EPA UCMR 5 monitoring, summarized using yearly averages from results available through January 15, 2026.

Source EPA UCMR 5 Period 2023–2025 Systems included 623 Release ucmr5-2026-01-15-analysis-v0.2
Systems with a yearly average at or above an EPA-based study benchmark
19.3%120 of 623 active community water systems

All 623 systems had enough required samples to calculate a yearly average. 120 had at least one yearly average at or above a study benchmark; 503 did not.

EPA-based study benchmark: the unrounded cutoff this research uses to reproduce EPA’s January 2026 technical-assistance classification around the April 2024 federal levels. It is not a current standard or compliance finding and cannot determine household exposure or health risk.

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Compound summary

System counts in California

Each count shows how many included water systems had a yearly average at or above the named study benchmark.

Community water systems with yearly averages at or above the EPA-based study benchmarks used in the January 2026 research release for California.
Study benchmarkSystems at or above benchmarkWater systems includedPercent
PFOA: 4.05 ppt study benchmark (reproduces EPA classification around 4 ppt)8262313.2%
PFOS: 4.05 ppt study benchmark (reproduces EPA classification around 4 ppt)10662317.0%
PFHxS: 15 ppt study benchmark (reproduces EPA classification around 10 ppt)106231.6%
PFNA: 15 ppt study benchmark (reproduces EPA classification around 10 ppt)06230.0%
HFPO-DA: 15 ppt study benchmark (reproduces EPA classification around 10 ppt)06230.0%
Hazard Index: 1.5 study benchmark with at least two detected components (reproduces EPA classification around 1)106231.6%
System directory

Community water systems with complete monitoring

“Complete monitoring” means at least one sampling location had all required samples needed for a yearly average. Each PWSID appears once, preventing double counting across ZIP associations.

Active community water systems with complete UCMR 5 monitoring in California.
Public water systemPWSIDPopulation servedPrimary sourceSampling locationsStudy benchmark result
ADELANTO, CITY OFCA361000139,930Ground water2At or above a study benchmark
ALAMEDA COUNTY WATER DISTRICTCA0110001344,000Surface water4Below all study benchmarks
ALCO WATER SERVICECA271000156,253Ground water6Below all study benchmarks
AMERICAN VALLEY CSDCA32100043,778Ground water11Below all study benchmarks
AMERICAN WATER O&M, LLC - VAFBCA421070014,971Surface water purchased2Below all study benchmarks
ANGELS, CITY OFCA05100033,836Surface water1Below all study benchmarks
ARCATA, CITY OFCA121000120,875Ground water purchased1Below all study benchmarks
ARMONA COMMUNITY SERVICES DISTCA16100014,143Ground water1Below all study benchmarks
ARROWHEAD VILLAS MUTUAL SERVICE COMPANYCA36100932,654Surface water purchased2Below all study benchmarks
ARROYO GRANDE, WATER DEPARTMENTCA401000117,963Surface water purchased3At or above a study benchmark
ARVIN COMMUNITY SERVICES DISTCA151000119,669Ground water3Below all study benchmarks
ATASCADERO MUTUAL WATER COCA401000230,618Ground water4At or above a study benchmark
ATASCADERO STATE HOSPITALCA40108324,100Ground water1At or above a study benchmark
AVENAL, CITY OFCA161000213,696Surface water2Below all study benchmarks
AVERYDALE MWCCA19100231,023Ground water2Below all study benchmarks
AWA BUCKHORN PLANTCA03100128,791Surface water1Below all study benchmarks
AWA, IONECA03100027,227Surface water1Below all study benchmarks
AZUSA LIGHT AND WATERCA1910007110,044Surface water5Below all study benchmarks
BAKERSFIELD, CITY OFCA1510031160,144Surface water purchased42At or above a study benchmark
BAKMAN WATER COMPANYCA101000117,393Ground water7Below all study benchmarks
BAKMAN WATER-ROLLING HILLSCA20100091,107Ground water3Below all study benchmarks
BANNING, CITY OFCA331000631,680Ground water12Below all study benchmarks
BAR-LEN MWCCA3600025126Ground water1Below all study benchmarks
BASS LAKE WATER COMPANYCA20100034,527Surface water4Below all study benchmarks
BEALE AIR FORCE BASECA58107006,785Ground water1Below all study benchmarks
BEAR VALLEY CSDCA15100385,592Ground water6Below all study benchmarks
BEAUMONT CHERRY VALLEY WDCA331000266,841Ground water10Below all study benchmarks
BELLA VISTA WATER DISTRICTCA451001418,612Surface water6Below all study benchmarks
BELLFLOWER - SOMERSET MWCCA191001346,300Surface water purchased6At or above a study benchmark
BELLFLOWER MUNICIPAL WATER SYSTEMCA19100185,999Surface water purchased2At or above a study benchmark
BEVERLY HILLS-CITY, WATER DEPT.CA191015640,121Surface water purchased2Below all study benchmarks
BIG BEAR CITY CSDCA361000812,738Ground water5At or above a study benchmark
BIG BEAR LAKE DWP - BIG BEAR SYSTEMCA361004426,132Ground water22Below all study benchmarks
BISHOP, CITY OFCA14100013,819Ground water2Below all study benchmarks
BLUE LAKE SPRINGS MUT WTRCA05100094,841Surface water purchased2Below all study benchmarks
BLUE LAKE, CITY OFCA12100021,172Ground water purchased1Below all study benchmarks
BLYTHE - CITY OFCA33100039,798Ground water3Below all study benchmarks
BOLINAS COMMUNITY PUDCA21100052,483Surface water1Below all study benchmarks
BORREGO WDCA37100363,429Ground water9Below all study benchmarks
BRAWLEY, CITY OFCA131000126,862Surface water purchased1Below all study benchmarks
BRENTWOODCA071000464,513Surface water purchased6Below all study benchmarks
BROOKTRAILS TOWNSHIP CSDCA23100093,632Surface water1Below all study benchmarks
BUELLTON WATER DEPARTMENTCA42100185,161Surface water purchased3Below all study benchmarks
BURBANK-CITY, WATER DEPT.CA1910179105,603Surface water purchased1Below all study benchmarks
CAL AM - MEADOWBROOKCA24100085,656Ground water3At or above a study benchmark
CAL AM - OAKHURSTCA20100073,693Ground water4Below all study benchmarks
CAL AM WATER COMPANY - MONTEREYCA271000492,450Groundwater under influence of surface water12At or above a study benchmark
CAL AMERICAN WATER COCA561004066,809Surface water purchased1Below all study benchmarks
CAL-AM WATER COMPANY - DUARTECA191018624,773Ground water8Below all study benchmarks
CAL-WATER SERVICE CO.-CHICOCA0410002114,925Ground water37At or above a study benchmark
CAL-WATER SERVICE CO.-MARYSVILLECA581000112,419Ground water8Below all study benchmarks
CAL-WATER SERVICE CO.-OROVILLECA041000511,106Surface water2Below all study benchmarks
CAL/AM WATER COMPANY - BALDWIN HILLSCA191005220,724Surface water purchased5Below all study benchmarks
CAL/AM WATER COMPANY - SAN MARINOCA191013947,995Surface water purchased7Below all study benchmarks
CALAM - ANTELOPECA341003135,534Surface water purchased15Below all study benchmarks
CALAM - ARDENCA34100454,191Surface water purchased6At or above a study benchmark
CALAM - LINCOLN OAKSCA341001348,094Surface water purchased19Below all study benchmarks
CALAM - PARKWAYCA341001750,573Surface water purchased9At or above a study benchmark
CALAM - WEST PLACERCA31101508,861Surface water purchased1Below all study benchmarks
CALAVERAS PUDCA05100026,286Surface water1Below all study benchmarks
CALIFORNIA CITY, CITY OFCA151003214,198Surface water purchased5Below all study benchmarks
CALIFORNIA INSTITUTION FOR MENCA361085010,667Ground water1Below all study benchmarks
CALIFORNIA REHABILITATION CENTER - NORCOCA33108004,300Surface water purchased1Below all study benchmarks
CALIFORNIA STATE FAIRCA34100269,280Ground water4At or above a study benchmark
CALIFORNIA STATE PRISON - SOLANOCA48108005,100Surface water2Below all study benchmarks
CALIFORNIA STATE UNIVERSITY FRESNOCA101033941,000Ground water3At or above a study benchmark
CALIFORNIA WATER SERVICE - BEAR GULCHCA411000661,431Surface water1Below all study benchmarks
CALIFORNIA WATER SERVICE - LIVERMORECA011000360,414Surface water purchased8At or above a study benchmark
CALIFORNIA WATER SERVICE - SAN CARLOSCA411000735,344Surface water purchased1Below all study benchmarks
CALIFORNIA WATER SERVICE - SAN MATEOCA4110008102,348Surface water purchased1Below all study benchmarks
CALIFORNIA WATER SERVICE - STOCKTONCA3910001176,266Surface water purchased12Below all study benchmarks
CALIFORNIA WATER SERVICE CO - WESTLAKECA561001619,533Surface water purchased1Below all study benchmarks
CALIFORNIA WATER SERVICE CO. - DIXONCA481000210,623Ground water3Below all study benchmarks
CALIFORNIA WATER SERVICE CO. - DOMINGUEZCA1910033143,996Surface water purchased9Below all study benchmarks
CALIFORNIA WATER SERVICE CO. - ELACA1910036152,474Surface water purchased10At or above a study benchmark
CALIFORNIA WATER SERVICE CO. - HERM/REDOCA191013496,853Surface water purchased3Below all study benchmarks
CALIFORNIA WATER SERVICE CO. - PALOS VERCA191010471,452Surface water purchased1Below all study benchmarks
CALIFORNIA WATER SERVICE CO.-LANCASTERCA19100101,387Surface water purchased2Below all study benchmarks
CALIFORNIA WATER SERVICE CO.-TRAVIS AFBCA481070118,111Surface water purchased1Below all study benchmarks
CALIFORNIA WATER SERVICE-S SAN FRANCISCOCA411000964,146Surface water purchased2Below all study benchmarks
CALIFORNIA-AMERICAN GEYSERVILLE (PUC)CA49100241,046Ground water2Below all study benchmarks
CALIFORNIA-AMERICAN LARKFIELD (PUC)CA49100237,913Ground water2Below all study benchmarks
CALISTOGA, CITY OFCA28100025,610Surface water2Below all study benchmarks
CAMARILLO WATER DEPTCA561001946,824Surface water purchased4Below all study benchmarks
CAMP PENDLETON (SOUTH)CA371070242,219Ground water2Below all study benchmarks
CAMROSA WATER DISTRICTCA561006332,700Surface water purchased5At or above a study benchmark
CANADA WOODS WCCA2702588356Groundwater under influence of surface water1Below all study benchmarks
CARLSBAD MWDCA371000595,158Surface water purchased4Below all study benchmarks
CARMICHAEL WATER DISTRICTCA341000441,193Groundwater under influence of surface water6Below all study benchmarks
CARPINTERIA VALLEY WATER DISTRICTCA421000115,996Surface water purchased4Below all study benchmarks
CASITAS MUNICIPAL WATER DISTCA561002411,005Surface water2Below all study benchmarks
CASTROVILLE COMMUNITY SERVICES DISTRICTCA27100057,515Ground water2Below all study benchmarks
CCI - TEHACHAPICA15108002,993Ground water1Below all study benchmarks
CCWD - COPPER COVECA05100175,187Surface water1Below all study benchmarks
CCWD - JENNY LINDCA05100069,861Surface water1Below all study benchmarks
CDCR-HIGH DESERT STATE PRISONCA18050043,857Ground water2Below all study benchmarks
CENTERVILLE C.S.D.CA45100114,151Surface water purchased1Below all study benchmarks
CENTINELA STATE PRISONCA13108014,100Surface water purchased1Below all study benchmarks
CERES, CITY OFCA501002854,513Surface water purchased8At or above a study benchmark
CERRITOS - CITY, WATER DEPT.CA191001947,475Surface water purchased4Below all study benchmarks
CHANNEL ISLANDS BEACH CSDCA56100394,560Surface water purchased1Below all study benchmarks
CHINA LAKE NAVAL AIR WEAPONS STATIONCA15107036,600Ground water6Below all study benchmarks
CHINO HILLS, CITY OFCA361003676,414Surface water purchased2Below all study benchmarks
CHINO, CITY OFCA361001286,435Surface water purchased8Below all study benchmarks
CHOWCHILLA CITY WATER DEPTCA201000113,916Ground water6Below all study benchmarks
CHUCKAWALLA VALLEY STATE PRISONCA33108024,090Ground water1Below all study benchmarks
CITRUS HEIGHTS WATER DISTRICTCA341000667,818Surface water purchased5Below all study benchmarks
CITY OF ALHAMBRACA191000179,776Surface water purchased4Below all study benchmarks
CITY OF ALTURASCA25100012,715Ground water4Below all study benchmarks
CITY OF ANAHEIMCA3010001348,593Surface water17At or above a study benchmark
CITY OF ANTIOCHCA0710001115,074Surface water1Below all study benchmarks
CITY OF ARCADIACA191000351,361Ground water9At or above a study benchmark
CITY OF ATWATERCA241000129,479Ground water8At or above a study benchmark
CITY OF BELL GARDENSCA191010811,437Surface water purchased2At or above a study benchmark
CITY OF BENICIACA481000127,131Surface water1Below all study benchmarks
CITY OF BREACA301000248,479Surface water purchased3Below all study benchmarks
CITY OF BUENA PARKCA301000381,998Surface water purchased9At or above a study benchmark
CITY OF CLOVISCA1010003130,130Surface water38At or above a study benchmark
CITY OF COLUSACA06100026,447Ground water5Below all study benchmarks
CITY OF CORNINGCA52100018,244Ground water7Below all study benchmarks
CITY OF CRESCENT CITYCA081000117,262Ground water1Below all study benchmarks
CITY OF CUPERTINOCA431001816,336Surface water purchased2Below all study benchmarks
CITY OF DALY CITYCA4110013104,901Surface water purchased5Below all study benchmarks
CITY OF DAVISCA571000167,457Surface water purchased8Below all study benchmarks
CITY OF DIXONCA481000912,540Ground water4Below all study benchmarks
CITY OF DOS PALOSCA24100027,452Surface water1Below all study benchmarks
CITY OF FAIRFIELDCA4810003120,377Surface water2Below all study benchmarks
CITY OF FOUNTAIN VALLEYCA301006956,747Surface water purchased7Below all study benchmarks
CITY OF FOWLERCA10100067,448Ground water6Below all study benchmarks
CITY OF FRESNOCA1010007545,716Surface water174At or above a study benchmark
CITY OF FULLERTONCA3010010139,461Surface water purchased7At or above a study benchmark
CITY OF GARDEN GROVECA3010062174,226Surface water purchased11At or above a study benchmark
CITY OF GILROYCA431000459,203Ground water7At or above a study benchmark
CITY OF GRIDLEYCA04100047,269Ground water5At or above a study benchmark
CITY OF GUSTINECA24100036,110Ground water4Below all study benchmarks
CITY OF HUNTINGTON BEACHCA3010053201,000Surface water purchased10At or above a study benchmark
CITY OF INDUSTRY WATERWORKS SYSTEMSCA19100296,158Ground water1Below all study benchmarks
CITY OF JACKSONCA03100015,019Surface water purchased1Below all study benchmarks
CITY OF LA HABRACA301001863,118Surface water purchased3Below all study benchmarks
CITY OF LA PALMACA301010015,948Surface water purchased3Below all study benchmarks
CITY OF LATHROPCA391001535,080Surface water purchased2At or above a study benchmark
CITY OF LINCOLNCA311000454,538Surface water purchased3Below all study benchmarks
CITY OF LIVE OAK, CACA51100019,285Ground water4Below all study benchmarks
CITY OF LIVERMORECA011001138,892Surface water purchased1Below all study benchmarks
CITY OF LIVINGSTONCA241000414,894Ground water8Below all study benchmarks
CITY OF LOS BANOSCA241000547,419Ground water13Below all study benchmarks
CITY OF MADERACA201000266,560Ground water9Below all study benchmarks
CITY OF MARTINEZCA071000630,997Surface water purchased1Below all study benchmarks
CITY OF MERCEDCA241000993,692Ground water21At or above a study benchmark
CITY OF MILLBRAECA411001822,795Surface water purchased1Below all study benchmarks
CITY OF MILPITASCA431000581,773Surface water purchased2Below all study benchmarks
CITY OF MODESTO - SALIDACA501000514,537Surface water purchased2Below all study benchmarks
CITY OF MORGAN HILLCA431000647,374Ground water16Below all study benchmarks
CITY OF MOUNTAIN VIEWCA431000781,501Surface water purchased6Below all study benchmarks
CITY OF NEWMAN-WATER DEPARTMENTCA501001312,207Ground water5Below all study benchmarks
CITY OF NEWPORT BEACHCA301002368,572Surface water purchased2Below all study benchmarks
CITY OF ORANGECA3010027120,770Surface water purchased11At or above a study benchmark
CITY OF ORANGE COVECA10100239,525Surface water1Below all study benchmarks
CITY OF ORLANDCA11100018,298Ground water7Below all study benchmarks
CITY OF PALO ALTOCA431000967,231Surface water purchased1Below all study benchmarks
CITY OF PARLIERCA101002514,576Ground water4Below all study benchmarks
CITY OF PITTSBURGCA071000862,500Surface water purchased1Below all study benchmarks
CITY OF PLEASANTONCA011000876,689Surface water purchased3At or above a study benchmark
CITY OF RED BLUFFCA521000414,710Ground water11Below all study benchmarks
CITY OF REDDINGCA451000589,628Surface water11At or above a study benchmark
CITY OF RIO VISTACA481000410,489Ground water7Below all study benchmarks
CITY OF ROSEVILLECA3110008155,612Surface water8Below all study benchmarks
CITY OF SACRAMENTO MAINCA3410020527,979Surface water13At or above a study benchmark
CITY OF SAN BRUNOCA411002342,631Surface water purchased5Below all study benchmarks
CITY OF SAN CLEMENTECA301003651,545Surface water purchased2Below all study benchmarks
CITY OF SAN JOSE - EVG/EDV/COYCA4310020101,265Surface water purchased4Below all study benchmarks
CITY OF SAN JOSE - NSJ/ALVISOCA431001945,559Surface water purchased3Below all study benchmarks
CITY OF SAN JUAN CAPISTRANOCA301003039,684Surface water purchased3Below all study benchmarks
CITY OF SANGERCA101002926,357Ground water10At or above a study benchmark
CITY OF SANTA ANACA3010038310,539Surface water purchased12At or above a study benchmark
CITY OF SANTA BARBARA WATER DEPARTMENTCA421001099,323Surface water2Below all study benchmarks
CITY OF SANTA CLARACA4310012130,746Surface water purchased20Below all study benchmarks
CITY OF SEAL BEACHCA301004124,937Surface water purchased4Below all study benchmarks
CITY OF SHASTA LAKECA451000610,657Surface water1Below all study benchmarks
CITY OF SOUTH PASADENACA191015425,329Surface water purchased2Below all study benchmarks
CITY OF STOCKTONCA3910012191,302Surface water17Below all study benchmarks
CITY OF SUNNYVALECA4310014157,566Surface water purchased8Below all study benchmarks
CITY OF SUSANVILLECA18100017,811Ground water5Below all study benchmarks
CITY OF TUSTINCA301004666,600Surface water purchased5Below all study benchmarks
CITY OF VACAVILLECA481000899,650Surface water9At or above a study benchmark
CITY OF VALLEJOCA4810007121,420Surface water1Below all study benchmarks
CITY OF VALLEJO-LAKES SYSTEMCA48100212,800Surface water1Below all study benchmarks
CITY OF WATERFORDCA50100068,788Ground water4Below all study benchmarks
CITY OF WESTMINSTERCA301006490,911Surface water purchased10At or above a study benchmark
CITY OF WHEATLANDCA58100044,124Ground water6At or above a study benchmark
CITY OF WILLIAMSCA06100045,538Ground water2Below all study benchmarks
CITY OF WINTERSCA57100057,115Ground water5Below all study benchmarks
CITY OF WOODLANDCA571000661,462Surface water purchased8Below all study benchmarks
CLEAR CREEK CSD-ANDERSONCA45100168,900Surface water4Below all study benchmarks
CLOVERDALE, CITY OFCA491000210,398Groundwater under influence of surface water1Below all study benchmarks
COACHELLA VWD: COVE COMMUNITYCA3310001270,000Ground water20Below all study benchmarks
COACHELLA VWD: I.D. NO. 8CA33100484,600Ground water4Below all study benchmarks
COACHELLA WATER AUTHORITYCA331000743,590Ground water6Below all study benchmarks
COALINGA-CITYCA101000417,277Surface water1Below all study benchmarks
COASTSIDE COUNTY WATER DISTRICTCA411001118,940Surface water2Below all study benchmarks
COLTON, CITY OFCA361001446,525Ground water8At or above a study benchmark
COMMERCE-CITY, WATER DEPT.CA19100504,205Surface water purchased3At or above a study benchmark
COMPTON-CITY, WATER DEPT.CA191002674,877Surface water purchased6At or above a study benchmark
CONTRA COSTA WATER DISTRICTCA0710003198,000Surface water3Below all study benchmarks
CORCORAN, CITY OFCA161000422,808Ground water1Below all study benchmarks
CORONA, CITY OFCA3310037168,575Surface water purchased15Below all study benchmarks
CORRECTIONAL TRAINING FACILITY - SOLEDADCA27108504,269Ground water1Below all study benchmarks
COTATI, CITY OFCA49100167,303Ground water5Below all study benchmarks
COTTONWOOD COUNTY WATER DIST.CA45100073,316Ground water5Below all study benchmarks
CRESCENTA VALLEY CWDCA191002835,841Surface water purchased7At or above a study benchmark
CRESTLINE VILLAGE CWD - DIVISION 10CA361001511,650Surface water purchased16At or above a study benchmark
CUCAMONGA VALLEY WATER DISTRICTCA3610018211,069Surface water8Below all study benchmarks
CUTLER PUDCA54100016,200Ground water2Below all study benchmarks
CWS - BAKERSFIELDCA1510003267,881Surface water46At or above a study benchmark
CWS - NORTH GARDENCA151005522,762Surface water9Below all study benchmarks
CWS - SELMACA101002426,517Ground water8Below all study benchmarks
CWS - VISALIACA5410016148,496Ground water43At or above a study benchmark
CWSC KING CITYCA271000916,334Ground water6Below all study benchmarks
CWSC LAS LOMASCA27100132,084Ground water2Below all study benchmarks
CWSC LOS ALTOS SUBURBANCA431000169,973Surface water purchased16Below all study benchmarks
CWSC OAK HILLSCA27100193,161Ground water2Below all study benchmarks
CWSC SALINASCA2710010123,679Ground water20Below all study benchmarks
CWSC SALINAS HILLSCA27100125,293Ground water6Below all study benchmarks
Cache Creek Casino Resort09060510712,800Ground water2Below all study benchmarks
Cal Am - Fruitridge VistaCA341002315,652Surface water purchased9Below all study benchmarks
Cal Am - Suburban RosemontCA341001054,793Surface water purchased20At or above a study benchmark
Colusa Southern System0906050473,474Ground water2Below all study benchmarks
DEL MAR, CITY OFCA37100043,919Surface water purchased1Below all study benchmarks
DEL PASO MANOR COUNTY WATER DICA34100074,854Ground water4Below all study benchmarks
DELANO, CITY OFCA151000551,428Ground water12Below all study benchmarks
DENAIR COMMUNITY SERVICES DISTRICTCA50100215,090Ground water4Below all study benchmarks
DESERT WATER AGENCYCA331000574,807Surface water9Below all study benchmarks
DINUBA, CITY OFCA541000227,281Ground water7Below all study benchmarks
DOWNEY - CITY, WATER DEPT.CA1910034110,556Ground water5At or above a study benchmark
DUBLIN SAN RAMON SERVICES DISTRICTCA011000998,776Surface water purchased1Below all study benchmarks
EARLIMART PUDCA54100217,679Ground water4Below all study benchmarks
EAST BAY MUDCA01100051,442,800Surface water6Below all study benchmarks
EAST NILES CSDCA151000632,517Surface water purchased3Below all study benchmarks
EAST PASADENA WATER CO.CA19100209,949Ground water2Below all study benchmarks
EAST VALLEY WATER DISTRICTCA3610064108,629Surface water13At or above a study benchmark
EASTERN MUNICIPAL WDCA3310009666,581Surface water purchased14Below all study benchmarks
EDWARDS AFB - MAIN BASECA151070111,316Surface water purchased2Below all study benchmarks
EL DORADO ID - MAINCA0910001132,171Surface water3Below all study benchmarks
EL MONTE-CITY, WATER DEPT.CA191003822,968Ground water4Below all study benchmarks
EL TORO WATER DISTRICTCA301007951,800Surface water purchased4Below all study benchmarks
ELK GROVE WATER SERVICECA341000843,813Surface water purchased5Below all study benchmarks
ELSINORE VALLEY MWDCA3310012169,455Surface water8Below all study benchmarks
ESCALON, CITY OFCA39100037,429Ground water3Below all study benchmarks
ESTERO MUNICIPAL IMPROVEMENT DISTRICTCA411002136,556Surface water purchased1Below all study benchmarks
EUREKA, CITY OFCA121000427,078Ground water purchased1Below all study benchmarks
FAIR OAKS WATER DISTRICTCA341000936,226Surface water purchased5Below all study benchmarks
FALLBROOK PUDCA371000835,237Surface water purchased3Below all study benchmarks
FARM MUTUAL W.C. (THE)CA33100464,026Surface water purchased1Below all study benchmarks
FARMERSVILLE, CITY OFCA541000410,243Ground water4Below all study benchmarks
FILLMORE WATER DEPTCA561000216,419Ground water2Below all study benchmarks
FIREBAUGH CITYCA10100058,096Ground water2Below all study benchmarks
FLORIN COUNTY WATER DISTRICTCA34100337,831Ground water10At or above a study benchmark
FOLSOM, CITY OF - ASHLANDCA34100303,317Surface water purchased1Below all study benchmarks
FOLSOM, CITY OF - MAINCA341001480,969Surface water1Below all study benchmarks
FORESTHILL PUBLIC UTILITY DISTCA31100036,782Surface water1Below all study benchmarks
FORT BRAGG, CITY OFCA23100016,919Surface water1Below all study benchmarks
FORTUNA, CITY OFCA121000612,133Ground water1Below all study benchmarks
GEORGETOWN DIVIDE PUDCA09100139,434Surface water2Below all study benchmarks
GLEN HELEN WATER SYSTEMCA36001085,900Ground water5Below all study benchmarks
GLENDALE-CITY, WATER DEPT.CA1910043188,784Surface water purchased5At or above a study benchmark
GLENDORA-CITY, WATER DEPT.CA191004449,934Surface water purchased3Below all study benchmarks
GOLDEN HILLS CSDCA15100459,857Ground water8At or above a study benchmark
GOLDEN STATE WATER CO - APPLE VLY SOUTHCA36101076,208Ground water3Below all study benchmarks
GOLDEN STATE WATER CO - ARDEN WATER SERVCA34100035,658Ground water6Below all study benchmarks
GOLDEN STATE WATER CO - BARSTOWCA361004332,547Ground water4Below all study benchmarks
GOLDEN STATE WATER CO - WRIGHTWOODCA36100474,177Ground water8Below all study benchmarks
GOLDEN STATE WATER CO. - CORDOVACA341001547,161Surface water8Below all study benchmarks
GOLDEN STATE WATER CO.-CLEARLAKE SYSTEMCA17100024,644Surface water1Below all study benchmarks
GOLDEN STATE WATER COMPANY - BAY POINTCA071000223,731Surface water purchased1Below all study benchmarks
GOLDEN STATE WATER COMPANY - LOS OSOSCA40100175,924Ground water4Below all study benchmarks
GOLDEN STATE WATER COMPANY - NIPOMOCA40100184,506Surface water purchased3Below all study benchmarks
GOLDEN STATE WATER COMPANY - SIMI VALLEYCA561005945,128Surface water purchased2Below all study benchmarks
GOLDEN STATE WC - COWAN HEIGHTSCA30100476,997Surface water purchased2Below all study benchmarks
GOLDEN STATE WC - PLACENTIA/YORBA LINDACA301003550,381Surface water purchased4At or above a study benchmark
GOLDEN STATE WC - WEST ORANGE COUNTYCA3010022114,379Surface water purchased12At or above a study benchmark
GOLETA WATER DISTRICTCA421000484,462Surface water10Below all study benchmarks
GONZALES, CITY OFCA27100078,327Ground water4Below all study benchmarks
GREAT OAKS WC INCCA4310022110,088Ground water19Below all study benchmarks
GREENFIELD COUNTY WDCA151002411,590Ground water6Below all study benchmarks
GREENFIELD, CITY OFCA271000818,967Ground water2Below all study benchmarks
GROVELAND COMMUNITY SERV DISTCA55100093,400Surface water3Below all study benchmarks
GSWC - ARTESIACA191000450,415Ground water5At or above a study benchmark
GSWC - BELL, BELL GARDENSCA191001155,050Surface water purchased5At or above a study benchmark
GSWC - CLAREMONTCA191002439,730Surface water purchased11At or above a study benchmark
GSWC - CULVER CITYCA191003038,233Surface water purchased1Below all study benchmarks
GSWC - FLORENCE/GRAHAMCA191007763,472Surface water purchased3Below all study benchmarks
GSWC - HOLLYDALECA19101958,099Ground water2Below all study benchmarks
GSWC - NORWALKCA191009843,167Surface water purchased6Below all study benchmarks
GSWC - SOUTHWESTCA1910155277,740Surface water purchased8Below all study benchmarks
GSWC - WillowbrookCA191007210,793Surface water purchased2Below all study benchmarks
GSWC-CALIPATRIACA13100037,363Surface water purchased1Below all study benchmarks
GSWC-SOUTH ARCADIACA191021227,072Ground water5At or above a study benchmark
GSWC-SOUTH SAN GABRIELCA191022326,240Surface water purchased3Below all study benchmarks
GUADALUPE VALLEY MIDCA41100051,472Surface water purchased1Below all study benchmarks
Golden State Water Co. - OrcuttCA421001634,102Surface water purchased12Below all study benchmarks
HAWTHORNE-CITY WATER DEPT.CA191004744,718Surface water purchased2Below all study benchmarks
HEALDSBURG, CITY OFCA491000510,985Groundwater under influence of surface water3Below all study benchmarks
HEBER PUBLIC UTILITY DISTRICTCA13100076,979Surface water purchased1Below all study benchmarks
HELENDALE COMMUNITY SERVICE DISTRICTCA36101126,347Ground water2At or above a study benchmark
HELIX WATER DISTRICTCA3710010277,668Surface water1Below all study benchmarks
HEMET, CITY OFCA331001633,828Surface water purchased3Below all study benchmarks
HERITAGE RANCH CSDCA40100122,956Surface water1Below all study benchmarks
HESPERIA WDCA3610024100,744Ground water15At or above a study benchmark
HI DESERT WDCA361007326,411Ground water7Below all study benchmarks
HIDDEN VALLEY LAKE CSDCA17100156,235Ground water1Below all study benchmarks
HIGHLANDS MUTUAL WATER COMPANYCA17100037,772Surface water1Below all study benchmarks
HOLLISTER, CITY OFCA351000126,017Surface water purchased6Below all study benchmarks
HOLTVILLE, CITY OFCA13100056,355Surface water purchased1Below all study benchmarks
HUGHSON, CITY OFCA50100087,481Ground water3Below all study benchmarks
HUMBOLDT C.S.D.CA121000919,807Ground water4Below all study benchmarks
HUNTINGTON PARK-CITY, WATER DEPT.CA191004915,437Surface water purchased6At or above a study benchmark
HURON, CITY OFCA10100449,306Surface water1Below all study benchmarks
Hoopa Valley-Wide System0906051263,500Surface water1Below all study benchmarks
INDIAN WELLS VALLEY W.D.CA151001741,580Ground water8Below all study benchmarks
INDIO WATER AUTHORITYCA331002084,757Ground water13Below all study benchmarks
INGLEWOOD- CITY, WATER DEPT.CA191005180,824Surface water purchased2Below all study benchmarks
IRVINE RANCH WATER DISTRICTCA3010092444,800Surface water8Below all study benchmarks
IVANHOE PUBLIC UTILITY DISTCA54100194,580Ground water4Below all study benchmarks
JACKSON VALLEY IRRIGATION DISTRICTCA03000373,553Surface water1Below all study benchmarks
JOSHUA BASIN WATER DISTRICTCA36100256,640Ground water5Below all study benchmarks
JURUPA COMMUNITY SDCA3310021135,093Surface water purchased8Below all study benchmarks
KELSEYVILLE CO WATERWORKS DISTRICT 3CA17100074,102Ground water4Below all study benchmarks
KERMAN, CITY OFCA101001817,256Ground water5Below all study benchmarks
KERN VALLEY STATE PRISONCA15108025,000Ground water1Below all study benchmarks
KEYES COMMUNITY SERVICES DIST.CA50100095,672Ground water1Below all study benchmarks
KINGSBURG, CITY OFCA101001913,540Ground water7Below all study benchmarks
KONOCTI COUNTY WATER DISTRICTCA17100065,928Surface water1Below all study benchmarks
LA CANADA IRRIGATION DIST.CA19100549,300Surface water purchased1Below all study benchmarks
LA CUMBRE MUTUAL WATER COCA42100244,861Surface water purchased3Below all study benchmarks
LA HABRA HEIGHTS CWDCA19102185,325Surface water purchased2At or above a study benchmark
LA PUENTE VALLEY CWDCA19100608,243Ground water1Below all study benchmarks
LA VERNE, CITY WDCA191006231,334Surface water purchased4Below all study benchmarks
LAGUNA BEACH COUNTY WDCA301001718,404Surface water purchased2Below all study benchmarks
LAKE ALMANOR COUNTRY CLUB MWCCA32100066,000Ground water5Below all study benchmarks
LAKE ARROWHEAD CSDCA36100057,038Surface water2At or above a study benchmark
LAKE HEMET MWDCA331002252,913Ground water10Below all study benchmarks
LAKEPORT, CITY OFCA17100044,762Surface water2Below all study benchmarks
LAKESIDE WDCA371001335,500Surface water purchased2Below all study benchmarks
LAKESIDE WOODS MUTUAL WATER COCA4500013310Ground water1Below all study benchmarks
LAMONT PUBLIC UTILITY DISTCA151001219,057Ground water6Below all study benchmarks
LAS FLORES WATER CO.CA19100614,847Surface water purchased1Below all study benchmarks
LAS VIRGENES MWDCA191022572,602Surface water4Below all study benchmarks
LATON COMMUNITY SERVICES DISTRICTCA10100201,151Ground water3Below all study benchmarks
LEMOORE NAVAL AIR STATIONCA161070015,000Surface water1Below all study benchmarks
LEMOORE, CITY OFCA161000527,185Ground water4Below all study benchmarks
LIBERTY UTILITIES (AV RANCHOS) CORP.CA361000364,469Ground water10Below all study benchmarks
LIBERTY UTILITIES - BELLFLOWER-NORWALKCA191021172,624Surface water purchased7At or above a study benchmark
LIBERTY UTILITIES - COMPTONCA191002126,371Surface water purchased4Below all study benchmarks
LIBERTY UTILITIES - LYNWOODCA191016124,701Surface water purchased3At or above a study benchmark
LINDA COUNTY WATER DISTRICTCA581000221,654Ground water4Below all study benchmarks
LITTLEROCK CREEK IRRIGATION DIST.CA19100643,040Ground water5Below all study benchmarks
LODI, CITY OFCA391000468,272Surface water25At or above a study benchmark
LOMA LINDA UNIVERSITYCA360015215,368Ground water3Below all study benchmarks
LOMA LINDA, CITY OFCA361001325,129Ground water5Below all study benchmarks
LOMPOC-CITY WATER UTILITY DIVCA421000640,473Surface water2Below all study benchmarks
LONG BEACH-CITY, WATER DEPT.CA1910065466,772Surface water purchased2Below all study benchmarks
LOS ANGELES CWWD 36-VAL VERDECA19101856,376Surface water purchased1Below all study benchmarks
LOS ANGELES CWWD 37-ACTONCA19102484,805Surface water purchased1Below all study benchmarks
LOS ANGELES CWWD 40, REG. 38-LAKE LACA191000512,568Surface water purchased2Below all study benchmarks
LOS ANGELES CWWD 40,REG 4 & 34-LANCASTERCA1910070208,129Surface water purchased10Below all study benchmarks
LOS ANGELES-CITY, DEPT. OF WATER & POWERCA19100673,875,566Surface water4Below all study benchmarks
LOS OSOS COMMUNITY SERVICES DISTRICTCA40100167,086Ground water7At or above a study benchmark
LUCERNE WATER CO. - CAL WATER SERVICECA17100052,129Surface water1Below all study benchmarks
LYNWOOD-CITY, WATER DEPT.CA191007966,967Surface water purchased6At or above a study benchmark
MADERA VALLEY WATER COMPANYCA20100106,494Ground water5Below all study benchmarks
MALAGA COUNTY WATER DISTRICTCA10100425,979Ground water3Below all study benchmarks
MAMMOTH CWDCA26100018,234Surface water4Below all study benchmarks
MANHATTAN BEACH-CITY, WATER DEPT.CA191008332,697Surface water purchased2Below all study benchmarks
MANTECA, CITY OFCA391000584,928Surface water purchased11At or above a study benchmark
MARIN MUNICIPAL WATER DISTRICTCA2110002186,895Surface water3Below all study benchmarks
MARINA COAST WATER DISTRICTCA271001738,377Ground water3Below all study benchmarks
MAYWOOD MUTUAL WATER CO. #1CA19100845,500Surface water purchased2At or above a study benchmark
MAYWOOD MUTUAL WATER CO. #2CA19100856,349Surface water purchased2Below all study benchmarks
MAYWOOD MUTUAL WATER CO. #3CA19100866,059Surface water purchased3At or above a study benchmark
MCFARLAND, CITY OFCA151001314,161Ground water3Below all study benchmarks
MCKINLEYVILLE C.S.D.CA121001616,900Ground water purchased1Below all study benchmarks
MEINERS OAKS CWDCA56100054,200Surface water purchased4Below all study benchmarks
MENDOTA, CITY OFCA101002111,404Ground water1Below all study benchmarks
MENLO PARK MUNICIPAL WATERCA411001722,362Surface water purchased1Below all study benchmarks
MESA WATER DISTRICTCA3010004110,000Surface water purchased9Below all study benchmarks
MID-PENINSULA WATER DISTRICTCA411000130,609Surface water purchased1Below all study benchmarks
MILLVIEW COUNTY WATER DISTRICTCA23100065,500Surface water3Below all study benchmarks
MISSION HILLS CSDCA42100193,600Ground water1Below all study benchmarks
MISSION SPRINGS WDCA331000843,484Ground water7Below all study benchmarks
MODESTO, CITY OFCA5010010218,771Surface water purchased42At or above a study benchmark
MOJAVE PUDCA15100144,699Surface water purchased5Below all study benchmarks
MONROVIA-CITY, WATER DEPT.CA191009037,931Ground water1At or above a study benchmark
MONTARA WATER AND SANITARY DISTRICTCA41100106,078Surface water3Below all study benchmarks
MONTE VISTA CWDCA361002956,017Surface water purchased9At or above a study benchmark
MONTEBELLO LAND & WATER CO.CA191009126,554Ground water3At or above a study benchmark
MONTEBELLO-CITY, WATER DEPT.CA19101177,330Surface water purchased2Below all study benchmarks
MONTECITO WATER DISTCA421000711,962Surface water7Below all study benchmarks
MONTEREY PARK-CITY, WATER DEPT.CA191009262,183Ground water1Below all study benchmarks
MORRO BAY PW DEPT - WATER DIVISIONCA401001113,757Surface water purchased1Below all study benchmarks
MOULTON NIGUEL WATER DISTRICTCA3010073170,236Surface water purchased2Below all study benchmarks
MOUNTAIN HOUSE COMMUNITY SERVICES DIST.CA391002724,948Surface water1Below all study benchmarks
MT. KONOCTI MUTUAL WATER COMPANYCA17100144,360Surface water1Below all study benchmarks
MT. SHASTA, CITY OFCA47100083,642Ground water3Below all study benchmarks
MUSCOY MWC NO. 1CA361003113,000Ground water1Below all study benchmarks
MYOMA DUNES MUTUAL WATER COMPANYCA33100519,445Ground water5Below all study benchmarks
Morongo09060014216,000Ground water5Below all study benchmarks
NEEDLES, CITY OFCA36100328,766Ground water3Below all study benchmarks
NEVADA ID - LAKE OF PINESCA29100146,870Surface water1Below all study benchmarks
NEVADA ID - LAKE WILDWOODCA29100239,108Surface water1Below all study benchmarks
NEVADA ID - NORTH AUBURNCA31100266,870Surface water1Below all study benchmarks
NIPOMO COMM SERVICES DISTCA401002613,771Surface water purchased5Below all study benchmarks
NORCO, CITY OFCA331002525,068Surface water purchased6At or above a study benchmark
NORTH COAST COUNTY WATER DISTCA411002538,546Surface water purchased1Below all study benchmarks
NORTH MARIN WATER DISTRICTCA211000361,691Surface water2Below all study benchmarks
NORTH TAHOE PUD - MAINCA31100016,321Surface water2Below all study benchmarks
NORTHSTAR C.S.D.CA311002815,452Surface water1Below all study benchmarks
NORWALK - CITY, WATER DEPT.CA191019120,283Surface water purchased6At or above a study benchmark
NPS GGNRACA211035018,447Surface water purchased1Below all study benchmarks
NUEVO WATER COMPANYCA33100266,733Surface water purchased1At or above a study benchmark
OAK PARK WATER SERVICECA561004313,898Surface water purchased1Below all study benchmarks
OAKDALE, CITY OFCA501001423,235Ground water7Below all study benchmarks
OCEANO COMM SERVICES DIST.CA40100057,601Surface water purchased3Below all study benchmarks
OCEANSIDE, CITY OFCA3710014171,483Surface water purchased2Below all study benchmarks
OILDALE MWCCA151001544,899Surface water purchased3Below all study benchmarks
OLIVEHURST PUBLIC U.D.CA581000316,595Ground water3Below all study benchmarks
OLIVENHAIN MWDCA371002986,458Surface water purchased1Below all study benchmarks
OLYMPIA MOBILODGECA3410022450Ground water1Below all study benchmarks
ONTARIO MUNICIPAL UTILITIES COMPANYCA3610034185,010Surface water purchased17At or above a study benchmark
ORANGE VALE WATER COMPANYCA341001616,861Surface water purchased1Below all study benchmarks
ORCHARD DALE WATER DISTRICTCA191010125,000Ground water purchased1At or above a study benchmark
OROSI PUBLIC UTILITY DISTRICTCA54100088,300Ground water4Below all study benchmarks
OTAY WATER DISTRICTCA3710034238,008Surface water purchased2Below all study benchmarks
OXNARD WATER DEPTCA5610007200,232Surface water purchased3Below all study benchmarks
PADRE DAM MWDCA371003793,980Surface water purchased2Below all study benchmarks
PAJARO COMMUNITY SERVICES DISTRICTCA27100206,500Ground water1Below all study benchmarks
PALM RANCH IRRIGATION DIST.CA19101035,507Surface water purchased1Below all study benchmarks
PALMDALE WATER DIST.CA1910102126,804Surface water5Below all study benchmarks
PARADISE IRRIGATION DISTRICTCA04100079,142Surface water2Below all study benchmarks
PARAMOUNT - CITY, WATER DEPT.CA191010555,200Surface water purchased2Below all study benchmarks
PASADENA-CITY, WATER DEPT.CA1910124164,344Surface water purchased4Below all study benchmarks
PASO ROBLES WATER DEPARTMENTCA401000731,176Surface water12At or above a study benchmark
PATTERSON TRACT CSDCA5402038550Ground water1Below all study benchmarks
PATTERSON, CITY OFCA501001724,977Ground water6Below all study benchmarks
PETALUMA, CITY OFCA491000660,781Ground water1Below all study benchmarks
PETER PITCHESS HONOR RANCHO DETN. CTRCA19000467,000Ground water1At or above a study benchmark
PHELAN PINON HILLS CSDCA361012024,285Ground water7Below all study benchmarks
PICO RIVERA - CITY, WATER DEPT.CA191004240,600Ground water8At or above a study benchmark
PICO WDCA191012522,051Ground water4At or above a study benchmark
PINEDALE COUNTY WATER DISTRICTCA101002616,736Ground water5At or above a study benchmark
PISMO BEACH WATER DEPARTMENTCA40100088,036Surface water purchased3Below all study benchmarks
PLACER CWA - AUBURN/BOWMANCA311000527,294Surface water2Below all study benchmarks
PLACER CWA - FOOTHILLCA311002589,544Surface water2Below all study benchmarks
PLACERVILLE, CITY OF - MAINCA09100039,224Surface water purchased1Below all study benchmarks
PLANADA CSDCA24100074,164Ground water6At or above a study benchmark
PLEASANT VALLEY MUTUAL WATER COCA56100085,000Surface water purchased2At or above a study benchmark
PLUMAS LAKECA580500110,464Ground water2Below all study benchmarks
POMONA - CITY, WATER DEPT.CA1910126151,713Surface water10At or above a study benchmark
PORT HUENEME WATER DEPTCA561000921,407Surface water purchased1Below all study benchmarks
PORTERVILLE, CITY OFCA541001063,487Ground water30At or above a study benchmark
PORTERVILLE-JONES CORNERCA5410048339Ground water2Below all study benchmarks
POWAY, CITY OFCA371001549,888Surface water1Below all study benchmarks
Pala North09060515314,280Ground water4At or above a study benchmark
Pauma0906050125,700Ground water2Below all study benchmarks
Pechanga09060501329,100Surface water purchased5Below all study benchmarks
QUARTZ HILL WATER DIST.CA191013019,100Surface water purchased4Below all study benchmarks
RAMONA MUNICIPAL WDCA371001937,047Surface water purchased1Below all study benchmarks
RANCHERITOS MWCCA3600200487Ground water3Below all study benchmarks
RANCHO CALIFORNIA WATER DISTRICTCA3310038146,147Surface water purchased38At or above a study benchmark
RANCHO MURIETA COMMUNITY SERVICA34100055,728Surface water2Below all study benchmarks
REDLANDS CITY MUD-WATER DIVCA361003778,025Surface water18At or above a study benchmark
REDWOOD VALLEY COUNTY WATER DISTRICTCA23100085,200Surface water1Below all study benchmarks
REEDLEY, CITY OFCA101002726,076Ground water7Below all study benchmarks
RIALTO, CITY OFCA361003854,453Surface water purchased9Below all study benchmarks
RIO DELL, CITY OFCA12100123,300Surface water2Below all study benchmarks
RIO LINDA/ELVERTA COMMUNITY WATER DISTCA341001815,460Ground water12Below all study benchmarks
RIPON, CITY OFCA391000715,741Ground water5At or above a study benchmark
RIVERBANK, CITY OFCA501001824,834Ground water9Below all study benchmarks
RIVERSIDE CSA #122-MESA VERDECA3310028766Ground water1Below all study benchmarks
RIVERSIDE HIGHLAND WATER COMPANYCA361005720,188Ground water3At or above a study benchmark
RIVERSIDE, CITY OFCA3310031298,398Groundwater under influence of surface water1Below all study benchmarks
ROHNERT PARK, CITY OFCA491001443,821Ground water8Below all study benchmarks
ROSAMOND CSDCA151001817,711Surface water purchased2Below all study benchmarks
ROWLAND WATER DISTRICTCA191019456,100Surface water purchased4Below all study benchmarks
RUBIDOUX COMMUNITY SDCA331004436,827Ground water2Below all study benchmarks
RUBIO CANON LAND & WATER ASSOCIATIONCA19101409,215Surface water5At or above a study benchmark
RUNNING SPRINGS WATER DISTRICTCA36100625,268Surface water purchased10At or above a study benchmark
RUSSIAN RIVER COUNTY WATER DISTRICTCA49100084,150Ground water1Below all study benchmarks
Rincon Northern0906001477,003Ground water3At or above a study benchmark
SACRAMENTO SUBURBAN WATER DISTRICTCA3410001194,444Surface water purchased57Below all study benchmarks
SALINAS VALLEY STATE PRISONCA27108512,930Ground water2Below all study benchmarks
SAN ANTONIO WATER COMPANYCA36100853,441Ground water4Below all study benchmarks
SAN BERNARDINO CITYCA3610039214,665Ground water22Below all study benchmarks
SAN DIEGO, CITY OFCA37100201,385,379Surface water4Below all study benchmarks
SAN DIEGUITO WDCA371002140,405Surface water purchased1Below all study benchmarks
SAN FERNANDO-CITY, WATER DEPT.CA191014323,946Ground water4Below all study benchmarks
SAN FRANCISCO REGIONAL WATER SYSTEMCA3810001600Surface water3Below all study benchmarks
SAN GABRIEL COUNTY WDCA191014439,345Ground water5Below all study benchmarks
SAN GABRIEL VALLEY WATER CO.-MONTEBELLOCA19101899,630Ground water purchased1Below all study benchmarks
SAN GABRIEL VALLEY WC - FONTANACA3610041237,700Surface water11Below all study benchmarks
SAN JACINTO, CITY OFCA331003218,950Ground water3Below all study benchmarks
SAN JOAQUIN COUNTY - LINCOLN VILLAGECA39100105,841Surface water purchased1Below all study benchmarks
SAN JOAQUIN COUNTY-MOKELUMNE ACRESCA39100173,802Ground water5At or above a study benchmark
SAN JOAQUIN RIVER CLUB INCCA3910018600Ground water1Below all study benchmarks
SAN JOAQUIN, CITY OFCA10100344,060Ground water3Below all study benchmarks
SAN JOSE WATERCA43100111,039,920Surface water19Below all study benchmarks
SAN JUAN WATER DISTRICTCA341002129,598Surface water1Below all study benchmarks
SAN LORENZO VALLEY WATER DISTCA441001421,145Surface water8Below all study benchmarks
SAN LUIS OBISPO WATER DEPARTMENTCA401000947,788Surface water1Below all study benchmarks
SANTA ANA RIVER WATER COMPANYCA33100335,848Ground water1Below all study benchmarks
SANTA CLARITA VALLEY W.A.-VALENCIA DIVISCA1910240294,090Surface water9At or above a study benchmark
SANTA CRUZ WATER DEPARTMENTCA441001094,626Surface water3Below all study benchmarks
SANTA FE I.D.CA371002321,578Surface water1Below all study benchmarks
SANTA FE SPRINGS - CITY, WATER DEPT.CA191024519,219Surface water purchased2At or above a study benchmark
SANTA MARGARITA WATER DISTRICTCA3010101168,289Surface water purchased2Below all study benchmarks
SANTA MARIA WATER DEPARTMENTCA4210011109,477Surface water purchased1Below all study benchmarks
SANTA MONICA-CITY, WATER DIVISIONCA191014689,947Surface water purchased3Below all study benchmarks
SANTA PAULA WATER SYSTEMCA561001131,018Ground water3Below all study benchmarks
SANTA ROSA, CITY OFCA4910009175,396Ground water2Below all study benchmarks
SANTA YNEZ RIVER WATER CONS. DIST. ID#1CA42100207,022Surface water purchased9Below all study benchmarks
SBDNO COUNTY SERVICE AREA 64CA361012114,911Ground water2Below all study benchmarks
SBNDO COUNTY SERVICE AREA 70JCA361012512,843Ground water2Below all study benchmarks
SCOTTS VALLEY WATER DISTRICTCA441001311,197Ground water3Below all study benchmarks
SCWA - ARDEN PARK VISTACA341000210,101Ground water10At or above a study benchmark
SCWA - LAGUNA/VINEYARDCA3410029184,896Surface water19At or above a study benchmark
SCWA MATHER-SUNRISECA341070430,825Surface water purchased3Below all study benchmarks
SEA RANCH WATER COMPANY,THE (PUC)CA49100071,160Surface water2Below all study benchmarks
SEBASTOPOL, CITY OFCA49100117,522Ground water4Below all study benchmarks
SERRANO WATER DISTRICTCA30100825,659Surface water purchased2Below all study benchmarks
SFPUC CITY DISTRIBUTION DIVISIONCA3810011848,019Surface water purchased6Below all study benchmarks
SFWP-MINERS RANCHCA041000622,664Surface water1Below all study benchmarks
SHAFTER, CITY OFCA151001921,915Ground water6Below all study benchmarks
SIERRA MADRE-CITY, WATER DEPT.CA191014811,000Surface water purchased2Below all study benchmarks
SIGNAL HILL - CITY, WATER DEPT.CA191014911,848Surface water purchased3Below all study benchmarks
SLVWD - FELTON WATER SYSTEMCA44100024,340Surface water2Below all study benchmarks
SO. CAL. EDISON CO.-SANTA CATALINACA19100063,822Surface water8Below all study benchmarks
SOLEDAD, CITY OFCA271001119,455Ground water5Below all study benchmarks
SOLVANG WATER DIVISIONCA42100136,126Surface water purchased9Below all study benchmarks
SONOMA STATE UNIVERSITYCA491002710,986Ground water1Below all study benchmarks
SONOMA, CITY OFCA491001211,725Ground water6At or above a study benchmark
SOQUEL CREEK WATER DISTRICTCA441001740,809Surface water purchased14Below all study benchmarks
SOUTH COAST WATER DISTRICTCA301004241,118Surface water purchased3Below all study benchmarks
SOUTH GATE-CITY, WATER DEPT.CA191015276,443Surface water purchased5At or above a study benchmark
SOUTH MESA WCCA331001710,108Ground water8Below all study benchmarks
SOUTH MONTEBELLO IRRIGATION DIST.CA191015315,021Ground water2At or above a study benchmark
SOUTH TAHOE PUD - MAINCA0910002100,000Ground water14At or above a study benchmark
ST. HELENA, CITY OFCA28100045,386Surface water3Below all study benchmarks
STALLION SPRINGS CSDCA15100254,910Ground water4Below all study benchmarks
STANFORD UNIVERSITYCA431001335,853Surface water purchased1Below all study benchmarks
SUBURBAN WATER SYSTEMS-GLENDORACA19100465,249Surface water purchased1Below all study benchmarks
SUBURBAN WATER SYSTEMS-LA MIRADACA191005956,793Surface water purchased3At or above a study benchmark
SUBURBAN WATER SYSTEMS-SAN JOSECA1910205168,843Surface water purchased7Below all study benchmarks
SUISUN-SOLANO WATER AUTHORITYCA481000529,105Surface water1Below all study benchmarks
SUNNY SLOPE WATER CO.CA191015725,252Ground water2Below all study benchmarks
SWEETWATER AUTHORITYCA3710025191,282Surface water3At or above a study benchmark
Suburban Water Systems - WhittierCA191017466,045Ground water1At or above a study benchmark
Sycuan09060502412,350Surface water purchased1Below all study benchmarks
TAHOE CITY PUD - MAINCA31100105,661Ground water5Below all study benchmarks
TEMESCAL VALLEY WATER DISTRICTCA331007421,971Surface water purchased1Below all study benchmarks
TEMPLETON CSDCA40100198,011Ground water5Below all study benchmarks
THERMALITO WATER & SEWER DISTCA041000812,136Surface water5Below all study benchmarks
THOUSAND OAKS WATER DEPTCA561002053,157Surface water purchased1Below all study benchmarks
THOUSAND TRAILS SAN BENITO PRESERVECA35005051,017Ground water2Below all study benchmarks
TIPTON COMMUNITY SERVICES DISTCA54100142,543Ground water3Below all study benchmarks
TORRANCE-CITY, WATER DEPT.CA1910213106,183Surface water purchased3Below all study benchmarks
TOWN OF DISCOVERY BAYCA071000916,790Ground water2Below all study benchmarks
TOWN OF HILLSBOROUGHCA411001611,766Surface water purchased1Below all study benchmarks
TRACT 180 MUTUAL WATER CO.CA191015914,000Ground water2At or above a study benchmark
TRACT 349 MUTUAL WATER CO.CA19101608,700Ground water2At or above a study benchmark
TRACY, CITY OFCA391001196,609Surface water6Below all study benchmarks
TROUT GULCH MUTUAL WATER COMPANYCA4400502614Ground water1Below all study benchmarks
TRUCKEE-DONNER PUD, MAINCA291000336,730Ground water10Below all study benchmarks
TUD - COLUMBIA WATER SYSTEMCA55100135,463Surface water2Below all study benchmarks
TUD - SONORA/JAMESTOWN WATER SYSTEMCA551000111,054Surface water1Below all study benchmarks
TUD - UPPER BASIN WATER SYSTEMCA551001213,280Surface water3Below all study benchmarks
TUD-WARDS FERRY RANCHESCA550036362Ground water1Below all study benchmarks
TULARE, CITY OFCA541001572,241Ground water22Below all study benchmarks
TURLOCK, CITY OFCA501001972,682Surface water purchased5Below all study benchmarks
TWENTYNINE PALMS WATER DISTRICTCA361004918,795Ground water7Below all study benchmarks
Table Mountain Rancheria09060015410,675Surface water1Below all study benchmarks
UC DavisCA571000949,616Surface water purchased7Below all study benchmarks
UKIAH, CITY OFCA231000316,607Surface water6At or above a study benchmark
UNION PUBLIC UTILITY DISTRICTCA05100014,774Surface water1Below all study benchmarks
UPLAND, CITY OFCA361005078,376Surface water10Below all study benchmarks
US ARMY FORT IRWINCA361070515,701Ground water1Below all study benchmarks
USMC - 29 PALMSCA361070316,067Ground water1Below all study benchmarks
VALENCIA HEIGHTS WATER CO.CA19101637,775Surface water purchased2Below all study benchmarks
VALLECITOS WDCA3710002113,500Surface water purchased2Below all study benchmarks
VALLEY COUNTY WATER DIST.CA191000968,871Ground water3Below all study benchmarks
VALLEY OF THE MOON WATER DISTRICTCA491001323,107Ground water7At or above a study benchmark
VALLEY VIEW MUTUAL WATER CO.CA19101654,613Ground water1Below all study benchmarks
VALLEY WATER CO.CA191016610,070Surface water purchased1Below all study benchmarks
VANDENBERG VILLAGE COMM. SERV. DIST.CA42100177,308Ground water1Below all study benchmarks
VAUGHN WC INCCA151002937,189Ground water13Below all study benchmarks
VENTURA CWWD NO. 1 - MOORPARKCA561001835,514Surface water purchased4Below all study benchmarks
VENTURA RIVER WATER DISTRICTCA56100226,100Surface water purchased3Below all study benchmarks
VENTURA WATER DEPARTMENTCA5610017113,500Surface water4Below all study benchmarks
VENTURA WWD NO. 8 - SIMI VALLEYCA561002394,738Surface water purchased2Below all study benchmarks
VERNON-CITY, WATER DEPT.CA191016728,112Surface water purchased8Below all study benchmarks
VICTORVILLE WATER DISTRICTCA3610052135,983Surface water purchased15Below all study benchmarks
VISTA IRRIGATION DISTRICTCA3710027132,430Surface water2Below all study benchmarks
Viejas Community System0906001589,600Ground water2Below all study benchmarks
WALNUT PARK MUTUAL WATER CO.CA191016916,180Ground water1Below all study benchmarks
WALNUT VALLEY WATER DISTRICTCA1910234100,941Surface water purchased2Below all study benchmarks
WASCO ST. PRISON RECEPTION CTRCA15108015,124Ground water1Below all study benchmarks
WASCO, CITY OFCA151002122,757Ground water6Below all study benchmarks
WATSONVILLE, CITY OFCA441001165,231Surface water14At or above a study benchmark
WEAVERVILLE C.S.D.CA53100013,975Surface water3At or above a study benchmark
WEST KERN WATER DISTRICTCA151002220,500Ground water1Below all study benchmarks
WEST VALLEY WATER DISTRICTCA3610004104,498Surface water9Below all study benchmarks
WESTBOROUGH COUNTY WATER DISTCA411002713,486Surface water purchased1Below all study benchmarks
WESTERN HEIGHTS WATER COMPANYCA36100537,705Surface water purchased1Below all study benchmarks
WESTERN MWDCA331004986,062Surface water purchased3Below all study benchmarks
WESTERN MWD - MURRIETA DIVISIONCA331003617,453Surface water purchased3At or above a study benchmark
WILLITS, CITY OFCA23100046,175Surface water1Below all study benchmarks
WILLOW COUNTY WATER DISTRICTCA23100053,797Surface water purchased1Below all study benchmarks
WINDSOR, TOWN OFCA491001725,561Ground water2Below all study benchmarks
WINE COUNTRY APARTMENTSCA390055940Ground water1Below all study benchmarks
WINTON WATER & SANITARY DISTCA24100109,745Ground water3Below all study benchmarks
WOODLAKE, CITY OFCA54100207,846Ground water7Below all study benchmarks
YORBA LINDA WATER DISTRICTCA301003784,292Surface water purchased3Below all study benchmarks
YOSEMITE SPRING PARK UTIL COCA20100055,300Ground water9At or above a study benchmark
YREKA, CITY OFCA47100117,825Surface water1Below all study benchmarks
YUCAIPA VALLEY WATER DISTRICTCA361005552,010Surface water16Below all study benchmarks
How the count works

What is included

Each active community water system with enough required samples for a yearly average is counted once, even if it is linked with several ZIP codes. This does not mean every home was tested. Private wells are excluded, and UCMR 5 did not comprehensively monitor every small system. This page does not apply California's state-specific standards or determine compliance. Use the official state or territory drinking-water program for current regulatory information.

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Related links

PFAS Estimator system lookupNational state comparison tableFull methodology and limitationsCurrent EPA UCMR 5 Data FinderOfficial state and territory drinking-water programs