Systems with a yearly average above an EPA comparison level
12.7%21 of 166 active community water systems
All 166 systems met the sampling requirement for a yearly average. Of those systems, 21 had at least one yearly average above an EPA comparison level and 145 did not.
EPA-based study benchmark: a fixed, unrounded research cutoff used to reproduce EPA’s final UCMR 5 technical-assistance classification based on the April 2024 federal levels. It is not a current federal or state standard. The label does not determine compliance, household exposure, or health risk.
State rules: The labels on this page use fixed research cutoffs based on the April 2024 federal levels. Arizona may use different current standards or guidance. These UCMR 5 results do not determine current federal or state compliance. Find the official Arizona drinking-water program →
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Find your water system
A ZIP code finds possible public water systems for an area; it cannot identify the supplier for a specific home. Confirm the provider using a water bill or utility record.
Compound summary
System counts in Arizona
Each count shows how many included water systems had a yearly average above the named EPA comparison level.
| EPA rounding cutoff | Systems above comparison level | Water systems included | Percent |
|---|---|---|---|
| PFOA: 4 ppt level; unrounded average ≥4.05 ppt after applying EPA rounding | 15 | 166 | 9.0% |
| PFOS: 4 ppt level; unrounded average ≥4.05 ppt after applying EPA rounding | 18 | 166 | 10.8% |
| PFHxS: 10 ppt level; unrounded average ≥15 ppt after applying EPA rounding | 4 | 166 | 2.4% |
| PFNA: 10 ppt level; unrounded average ≥15 ppt after applying EPA rounding | 0 | 166 | 0.0% |
| HFPO-DA: 10 ppt level; unrounded average ≥15 ppt after applying EPA rounding | 0 | 166 | 0.0% |
| Hazard Index: 1 level; unrounded index ≥1.5 and at least two detected components | 4 | 166 | 2.4% |
System directory
Community water systems with complete monitoring
“Complete monitoring” means at least one sampling location had every required sample needed to calculate a yearly average. It does not mean every location or home was tested. Each PWSID appears once, preventing double counting across ZIP associations.
| Public water system | PWSID | Population served | Primary source | Sampling locations | EPA comparison result |
|---|---|---|---|---|---|
| ADOC EYMAN UNIT | AZ0411705 | 3,969 | Ground water | 1 | No available average above comparison levels |
| ADOC FLORENCE ASP | AZ0411066 | 1,001 | Ground water | 2 | No available average above comparison levels |
| ADOC TUCSON | AZ0420557 | 4,500 | Ground water | 1 | No available average above comparison levels |
| ARIZONA WATER CO - APACHE JUNCTION | AZ0411004 | 62,055 | Ground water | 2 | No available average above comparison levels |
| ARIZONA WATER CO - BISBEE | AZ0402001 | 8,707 | Ground water | 1 | Above an EPA comparison level |
| ARIZONA WATER CO - LAKESIDE | AZ0409003 | 12,191 | Ground water | 5 | No available average above comparison levels |
| ARIZONA WATER CO - MIAMI CLAYPOOL | AZ0404002 | 8,656 | Ground water | 11 | No available average above comparison levels |
| ARIZONA WATER CO - ORACLE | AZ0411019 | 10,585 | Ground water | 4 | No available average above comparison levels |
| ARIZONA WATER CO - OVERGAARD | AZ0409004 | 13,797 | Ground water | 5 | No available average above comparison levels |
| ARIZONA WATER CO - PINAL VALLEY | AZ0411009 | 134,432 | Ground water | 10 | No available average above comparison levels |
| ARIZONA WATER CO - PINETOP LAKES | AZ0409018 | 3,513 | Ground water | 1 | No available average above comparison levels |
| ARIZONA WATER CO - PINEWOOD | AZ0403002 | 8,089 | Ground water | 3 | No available average above comparison levels |
| ARIZONA WATER CO - RIMROCK | AZ0413046 | 3,423 | Ground water | 5 | No available average above comparison levels |
| ARIZONA WATER CO - SAN MANUEL | AZ0411020 | 4,748 | Ground water purchased | 1 | No available average above comparison levels |
| ARIZONA WATER CO - SEDONA | AZ0403003 | 12,104 | Ground water | 8 | Above an EPA comparison level |
| ARIZONA WATER CO - SIERRA VISTA | AZ0402004 | 9,175 | Ground water | 7 | No available average above comparison levels |
| ARIZONA WATER CO - SUPERIOR | AZ0411021 | 4,393 | Ground water | 1 | No available average above comparison levels |
| ASPC LEWIS COMPLEX WATER SYSTEM | AZ0407555 | 4,300 | Ground water | 1 | No available average above comparison levels |
| ASPC YUMA | AZ0414099 | 4,197 | Ground water | 1 | No available average above comparison levels |
| AVRA WATER COOP INC | AZ0410006 | 6,685 | Ground water | 2 | No available average above comparison levels |
| AZ STATE PRISON - GEO GROUP - KINGMAN | AZ0408184 | 3,500 | Ground water | 1 | No available average above comparison levels |
| AZ Water Co. - White Tanks | AZ0407128 | 18,858 | Surface water purchased | 4 | No available average above comparison levels |
| Ak Chin Village | 090400090 | 11,646 | Surface water | 1 | No available average above comparison levels |
| BEARDSLEY WATER COMPANY 1 | AZ0407007 | 10,263 | Ground water | 3 | No available average above comparison levels |
| BELLA VISTA CITY WATER SYSTEM | AZ0402010 | 20,045 | Ground water | 15 | No available average above comparison levels |
| BENSON, CITY OF WATER SYSTEM | AZ0402005 | 5,355 | Ground water | 4 | No available average above comparison levels |
| BERMUDA WATER COMPANY INC | AZ0408063 | 25,000 | Ground water | 9 | No available average above comparison levels |
| BIA Truxton Agency | 090400063 | 16 | Ground water | 1 | No available average above comparison levels |
| BIG PARK WATER COMPANY | AZ0413012 | 7,392 | Ground water | 5 | Above an EPA comparison level |
| BUCKEYE CITY OF | AZ0407089 | 7,008 | Ground water | 1 | No available average above comparison levels |
| CAMP VERDE WATER SYSTEM | AZ0413015 | 5,013 | Ground water | 1 | No available average above comparison levels |
| CAREFREE WATER COMPANY | AZ0407015 | 3,894 | Surface water purchased | 3 | No available average above comparison levels |
| CAVE CREEK WATER | AZ0407016 | 5,895 | Surface water | 1 | No available average above comparison levels |
| CCA - ELOY COMPLEX | AZ0411115 | 8,852 | Ground water | 2 | No available average above comparison levels |
| CHANDLER CITY OF | AZ0407090 | 247,328 | Surface water | 27 | No available average above comparison levels |
| CITY OF BUCKEYE - VALENCIA TOWN DIVISION | AZ0407078 | 30,377 | Ground water | 1 | No available average above comparison levels |
| CITY OF BUCKEYE SONORA - SUNDANCE | AZ0407154 | 15,783 | Ground water | 2 | No available average above comparison levels |
| CITY OF SHOW LOW | AZ0409026 | 17,139 | Ground water | 10 | No available average above comparison levels |
| CITY OF WILLCOX | AZ0402035 | 3,236 | Ground water | 1 | No available average above comparison levels |
| CLARKDALE MUNICIPAL WATER SYSTEM | AZ0413024 | 4,920 | Ground water | 2 | No available average above comparison levels |
| COMMUNITY WC OF GREEN VALLEY | AZ0410004 | 22,085 | Ground water | 4 | No available average above comparison levels |
| COPPER MOUNTAIN RANCH CFD | AZ0411328 | 1,071 | Ground water | 1 | No available average above comparison levels |
| COTTONWOOD MUNICIPAL WATER CW1 | AZ0413025 | 11,023 | Ground water | 5 | No available average above comparison levels |
| COTTONWOOD MUNICIPAL WATER VV6 | AZ0413106 | 4,509 | Ground water | 6 | No available average above comparison levels |
| Chinle-Many Farms-Del Muerto NTUA | NN0400174 | 8,458 | Ground water | 1 | No available average above comparison levels |
| City of Avondale | AZ0407088 | 96,130 | Surface water purchased | 6 | Above an EPA comparison level |
| City of Lake Havasu | AZ0408022 | 54,610 | Ground water | 1 | No available average above comparison levels |
| Colorado River Regional Water System | 090400051 | 3,476 | Ground water | 1 | No available average above comparison levels |
| DESERT HILLS WATER | AZ0407026 | 4,220 | Surface water purchased | 2 | No available average above comparison levels |
| DESERT OASIS | AZ0407523 | 23,963 | Ground water | 2 | No available average above comparison levels |
| DONEY PARK WATER | AZ0403005 | 8,996 | Ground water | 7 | No available average above comparison levels |
| DOUGLAS CITY OF | AZ0402014 | 16,656 | Ground water | 6 | No available average above comparison levels |
| Dilkon-Indian Wells-Greasewood-White Cone NTUA | NN0400342 | 4,986 | Ground water | 3 | No available average above comparison levels |
| EAGAR TOWN OF | AZ0401004 | 4,590 | Ground water | 6 | No available average above comparison levels |
| EL MIRAGE CITY OF | AZ0407091 | 39,884 | Ground water | 9 | No available average above comparison levels |
| ELOY CITY OF | AZ0411030 | 7,903 | Ground water | 2 | No available average above comparison levels |
| EPCOR - SAN TAN | AZ0411128 | 87,435 | Ground water | 7 | No available average above comparison levels |
| EPCOR WATER - AGUA FRIA | AZ0407695 | 127,718 | Surface water | 9 | No available average above comparison levels |
| EPCOR WATER - ANTHEM | AZ0407504 | 23,826 | Surface water | 1 | No available average above comparison levels |
| EPCOR WATER - CHAPARRAL CITY | AZ0407017 | 26,026 | Surface water | 3 | No available average above comparison levels |
| EPCOR WATER - LAKE HAVASU | AZ0408015 | 4,788 | Ground water | 1 | No available average above comparison levels |
| EPCOR WATER - MOHAVE | AZ0408032 | 36,330 | Ground water | 6 | Above an EPA comparison level |
| EPCOR WATER - NORTH EAST AGUA FRIA | AZ0407531 | 14,723 | Ground water | 2 | No available average above comparison levels |
| EPCOR WATER - NORTH MOHAVE VALLEY | AZ0408068 | 5,190 | Ground water | 2 | Above an EPA comparison level |
| EPCOR WATER - PARADISE VALLEY/SCOTTSDALE | AZ0407056 | 14,107 | Surface water purchased | 1 | No available average above comparison levels |
| EPCOR WATER - SUN CITY | AZ0407099 | 38,016 | Ground water | 7 | No available average above comparison levels |
| EPCOR WATER - SUN CITY WEST | AZ0407150 | 25,796 | Ground water | 2 | No available average above comparison levels |
| EPCOR WATER - TIERRA DEL RIO | AZ0407532 | 4,868 | Ground water | 1 | No available average above comparison levels |
| EPCOR WATER - WILLOW VALLEY/KING STREET | AZ0408040 | 3,408 | Ground water | 1 | No available average above comparison levels |
| FAR WEST WATER & SEWER INC | AZ0414004 | 32,425 | Surface water | 5 | No available average above comparison levels |
| FARMERS WATER CO CONTINENTAL | AZ0410049 | 5,592 | Ground water | 3 | No available average above comparison levels |
| FARMERS WATER CO SANTA RITA SPRINGS | AZ0410213 | 3,990 | Ground water | 1 | Above an EPA comparison level |
| FESTIVAL RANCH | AZ0407765 | 10,313 | Ground water | 1 | No available average above comparison levels |
| FLAGSTAFF CITY OF | AZ0403008 | 79,796 | Surface water | 10 | No available average above comparison levels |
| FLORENCE WATER COMPANY | AZ0411017 | 15,900 | Ground water | 5 | No available average above comparison levels |
| FLOWING WELLS IRRIGATION DISTRICT | AZ0410051 | 16,000 | Ground water | 6 | Above an EPA comparison level |
| Fort Defiance-Window Rock-St Michaels NTUA | NN0403000 | 12,869 | Ground water | 7 | No available average above comparison levels |
| Fort McDowell Community | 090400088 | 7,260 | Ground water | 2 | No available average above comparison levels |
| GILBERT, TOWN OF | AZ0407092 | 247,600 | Surface water | 19 | Above an EPA comparison level |
| GLEN CANYON NRA WAHWEAP | AZ0403712 | 579 | Ground water | 1 | No available average above comparison levels |
| GLENDALE CITY OF | AZ0407093 | 234,766 | Surface water | 8 | No available average above comparison levels |
| GLOBE CITY OF | AZ0404008 | 7,536 | Ground water | 3 | Above an EPA comparison level |
| GOLDEN SHORES WATER COMPANY | AZ0408024 | 3,970 | Ground water | 1 | No available average above comparison levels |
| GOLDEN VALLEY IMPROVEMENT DISTRICT | AZ0408081 | 3,950 | Ground water | 2 | No available average above comparison levels |
| GOODYEAR WATER DEPARTMENT | AZ0407094 | 50,001 | Surface water | 6 | Above an EPA comparison level |
| GREEN VALLEY DWID | AZ0410157 | 8,687 | Ground water | 1 | No available average above comparison levels |
| GRIC DPW Sacaton | 090400047 | 5,307 | Ground water | 3 | No available average above comparison levels |
| GRIC DPW Wild Horse Pass | 090400692 | 22,795 | Ground water | 2 | No available average above comparison levels |
| GWR - SANTA CRUZ WATER CO. INC. | AZ0411131 | 84,000 | Ground water | 2 | No available average above comparison levels |
| Ganado Public Schools | NN0400289 | 684 | Ground water | 2 | No available average above comparison levels |
| Ganado-Burnside-Cornfield-Steamboat NTUA | NN0403001 | 3,947 | Ground water | 3 | No available average above comparison levels |
| Greasewood Springs Community Boarding School BIA | NN0436008 | 720 | Ground water | 1 | No available average above comparison levels |
| HOLBROOK CITY OF | AZ0409015 | 4,833 | Ground water | 3 | No available average above comparison levels |
| JOHNSON UTIL - ANTHEM AT MERRILL RANCH | AZ0411136 | 10,362 | Ground water | 2 | Above an EPA comparison level |
| KACHINA VILLAGE DWID | AZ0403013 | 3,500 | Ground water | 3 | No available average above comparison levels |
| KATHERINE RESORTS LANDING | AZ0408018 | 58 | Ground water | 1 | No available average above comparison levels |
| KINGMAN MUNICIPAL WATER | AZ0408020 | 45,000 | Ground water | 7 | No available average above comparison levels |
| Kayenta NTUA | NN0403003 | 3,844 | Ground water | 7 | No available average above comparison levels |
| LAGO DEL ORO WATER COMPANY | AZ0411117 | 18,132 | Ground water | 13 | No available average above comparison levels |
| LAS QUINTAS SERENAS WATER COMPANY | AZ0410064 | 3,720 | Ground water | 2 | No available average above comparison levels |
| LIBERTY WATER LPSCO | AZ0407046 | 55,810 | Ground water | 7 | Above an EPA comparison level |
| LIBERTY WATER RIO RICO | AZ0412011 | 17,960 | Ground water | 6 | Above an EPA comparison level |
| MARANA MUNICIPAL - HARTMAN VISTAS | AZ0410329 | 5,248 | Ground water | 3 | Above an EPA comparison level |
| MARANA MUNICIPAL - MARANA | AZ0410150 | 15,162 | Ground water | 2 | Above an EPA comparison level |
| MARANA MUNICIPAL - PICTURE ROCKS | AZ0410092 | 5,278 | Ground water | 1 | No available average above comparison levels |
| MESA CITY OF | AZ0407095 | 466,000 | Surface water | 31 | No available average above comparison levels |
| METROPOLITAN DWID | AZ0410076 | 45,570 | Ground water | 21 | No available average above comparison levels |
| METROPOLITAN DWID - DIABLO VILLAGE | AZ0410357 | 5,542 | Ground water | 2 | No available average above comparison levels |
| METROPOLITAN DWID - HUB | AZ0410060 | 4,252 | Ground water | 5 | No available average above comparison levels |
| MISSION PALMS APARTMENTS | AZ0420570 | 720 | Ground water | 1 | No available average above comparison levels |
| MORENCI WATER ELEC CO MAIN | AZ0406003 | 4,108 | Surface water | 1 | No available average above comparison levels |
| NOGALES CITY OF | AZ0412004 | 22,000 | Ground water | 5 | No available average above comparison levels |
| OLD CONCHO WATER USERS | AZ0401011 | 40 | Ground water purchased | 1 | No available average above comparison levels |
| ORO VALLEY WATER COUNTRYSIDE | AZ0410175 | 4,534 | Ground water | 1 | No available average above comparison levels |
| ORO VALLEY WATER UTILITY | AZ0410164 | 42,316 | Ground water | 14 | No available average above comparison levels |
| PAGE CITY OF | AZ0403017 | 7,420 | Surface water | 1 | No available average above comparison levels |
| PATAGONIA WATER DEPARTMENT | AZ0412006 | 819 | Ground water | 1 | No available average above comparison levels |
| PAYSON TOWN OF | AZ0404032 | 17,682 | Ground water | 25 | Above an EPA comparison level |
| PEORIA CITY OF | AZ0407096 | 187,676 | Surface water | 17 | No available average above comparison levels |
| PHOENIX CITY OF | AZ0407025 | 1,695,000 | Surface water | 21 | No available average above comparison levels |
| PIMA UTILITIES | AZ0407120 | 20,000 | Ground water | 3 | No available average above comparison levels |
| PINE STRAWBERRY DWID | AZ0404034 | 8,013 | Ground water | 12 | No available average above comparison levels |
| PONDEROSA DWID | AZ0409023 | 5,375 | Ground water | 5 | No available average above comparison levels |
| PONDEROSA PARK DWID | AZ0413044 | 602 | Ground water | 2 | No available average above comparison levels |
| PRESCOTT CITY OF | AZ0413045 | 42,217 | Ground water | 4 | Above an EPA comparison level |
| PUEBLO DEL SOL WATER COMPANY | AZ0402044 | 12,804 | Ground water | 4 | No available average above comparison levels |
| Pinon-District 4 NTUA | NN0403004 | 5,195 | Ground water | 4 | No available average above comparison levels |
| Polacca | 090400106 | 3,890 | Ground water purchased | 1 | No available average above comparison levels |
| QUAIL CREEK WATER COMPANY | AZ0410262 | 6,812 | Ground water | 1 | No available average above comparison levels |
| QUEEN CREEK TOWN OF | AZ0407033 | 95,502 | Ground water | 19 | No available average above comparison levels |
| Quechan Utility | 090400089 | 5,660 | Ground water | 2 | No available average above comparison levels |
| RAY WATER COMPANY INC | AZ0410095 | 4,495 | Ground water | 3 | No available average above comparison levels |
| RIO VERDE UTILITIES | AZ0407121 | 5,330 | Ground water | 1 | No available average above comparison levels |
| ROSE VALLEY WATER COMPANY | AZ0407065 | 6,202 | Ground water | 1 | No available average above comparison levels |
| SAFFORD CITY OF | AZ0405005 | 20,600 | Ground water | 6 | No available average above comparison levels |
| SAHUARITA WATER COMPANY | AZ0410312 | 18,178 | Ground water | 1 | No available average above comparison levels |
| SAN LUIS CITY OF | AZ0414005 | 39,705 | Ground water | 6 | No available average above comparison levels |
| SCOTTSDALE CITY OF | AZ0407098 | 241,361 | Surface water | 7 | No available average above comparison levels |
| SCUA Upper Seven Mile | 090400114 | 8,478 | Ground water | 4 | No available average above comparison levels |
| SNOWFLAKE TOWN OF | AZ0409029 | 5,590 | Ground water | 3 | No available average above comparison levels |
| SOMERTON CITY OF | AZ0414015 | 14,197 | Ground water | 1 | No available average above comparison levels |
| ST JOHNS CITY OF | AZ0401012 | 3,500 | Ground water | 1 | No available average above comparison levels |
| SUNRISE WATER COMPANY | AZ0407070 | 6,490 | Ground water | 3 | No available average above comparison levels |
| SURPRISE CITY OF - MOUNTAIN VISTA | AZ0407500 | 40,007 | Ground water | 4 | No available average above comparison levels |
| Salt River Public Works | 090400109 | 20,951 | Ground water | 2 | No available average above comparison levels |
| Sells Intertie | 090400042 | 4,000 | Ground water | 1 | No available average above comparison levels |
| TEMPE CITY OF | AZ0407100 | 165,000 | Surface water | 10 | Above an EPA comparison level |
| TIERRA MESA ESTATES WATER COMPANY | AZ0414080 | 632 | Ground water | 1 | No available average above comparison levels |
| TOLLESON CITY OF | AZ0407101 | 9,300 | Surface water purchased | 3 | No available average above comparison levels |
| TOWN OF PRESCOTT VALLEY | AZ0413048 | 57,048 | Ground water | 19 | No available average above comparison levels |
| TUCSON CITY OF | AZ0410112 | 732,906 | Ground water | 83 | No available average above comparison levels |
| TUCSON WATER CORONA DE TUCSON | AZ0410169 | 10,217 | Ground water | 3 | No available average above comparison levels |
| Tuba City NTUA | NN0400206 | 6,276 | Ground water | 1 | No available average above comparison levels |
| US ARMY FORT HUACHUCA | AZ0402078 | 15,603 | Ground water | 5 | Above an EPA comparison level |
| USAF DAVIS MONTHAN AFB | AZ0420549 | 18,640 | Ground water | 5 | No available average above comparison levels |
| USAF LUKE AIR FORCE BASE | AZ0407305 | 8,440 | Surface water purchased | 4 | Above an EPA comparison level |
| USMC YUMA MAIN SYSTEM | AZ0414082 | 8,353 | Surface water | 1 | No available average above comparison levels |
| VAIL WATER COMPANY | AZ0410041 | 17,500 | Ground water | 1 | No available average above comparison levels |
| VALLEY PIONEERS WATER COMPANY INC | AZ0408038 | 6,063 | Ground water | 1 | No available average above comparison levels |
| VALLEY UTILITIES WATER COMPANY GLENDALE | AZ0407079 | 5,940 | Ground water | 4 | No available average above comparison levels |
| VOYAGER WATER COMPANY | AZ0410035 | 3,209 | Ground water | 3 | No available average above comparison levels |
| Vaya Chin Intertie | 090400020 | 1,151 | Ground water | 2 | No available average above comparison levels |
| WICKENBURG TOWN OF | AZ0407045 | 6,481 | Ground water | 5 | No available average above comparison levels |
| WINSLOW CITY OF | AZ0409035 | 9,789 | Ground water | 1 | No available average above comparison levels |
| WMATUA Miner Flat | 090400693 | 15,570 | Surface water | 2 | No available average above comparison levels |
| YUMA CITY OF | AZ0414024 | 103,264 | Surface water | 2 | No available average above comparison levels |
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. Private wells are excluded, and UCMR 5 did not comprehensively monitor every small system.