Systems reaching a study comparison level
2.4%5 of 205 active community water systems with complete monitoring
All 205 systems had complete monitoring. 5 reached at least one study comparison level; 200 did not. “Study comparison level” means the dated EPA technical cutoff used in this January 2026 research release. It does not determine household exposure, health risk, or current legal compliance.
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ZIP codes are used only to route visitors to public water systems that reported serving them. Confirm the actual provider using a water bill or utility record.
Compound summary
System counts in Missouri
Each count shows how many included water systems reached the named study level.
| Study comparison | Systems reaching level | Water systems included | Percent |
|---|---|---|---|
| PFOA: study level 4.05 ppt (April 2024 EPA level: 4 ppt) | 1 | 205 | 0.5% |
| PFOS: study level 4.05 ppt (April 2024 EPA level: 4 ppt) | 4 | 205 | 2.0% |
| PFHxS: study level 15 ppt (April 2024 EPA level: 10 ppt) | 0 | 205 | 0.0% |
| PFNA: study level 15 ppt (April 2024 EPA level: 10 ppt) | 0 | 205 | 0.0% |
| HFPO-DA: study level 15 ppt (April 2024 EPA level: 10 ppt) | 0 | 205 | 0.0% |
| Hazard Index: study level 1.5 with at least two detected components (April 2024 EPA level: 1) | 0 | 205 | 0.0% |
System directory
Community water systems with complete monitoring
Each PWSID appears once, preventing double counting across ZIP associations.
| Public water system | PWSID | Population served | Primary source | Sampling locations | Study comparison |
|---|---|---|---|---|---|
| ADAIR COUNTY PWSD 1 | MO2024000 | 7,500 | Surface water purchased | 2 | Below the study levels |
| ANDERSON PWS | MO5010016 | 1,961 | Ground water | 2 | Below the study levels |
| ANDREW COUNTY PWSD 1 | MO1024004 | 6,042 | Ground water purchased | 1 | Below the study levels |
| ANDREW COUNTY PWSD 2 | MO1024005 | 3,580 | Ground water purchased | 2 | Below the study levels |
| ASHLAND PWS | MO3010033 | 4,999 | Ground water | 2 | Below the study levels |
| AURORA VERONA | MO5010038 | 8,529 | Ground water | 4 | Below the study levels |
| BARTON DADE CEDAR JASP COUNTYCONS PWSD 1 | MO5024023 | 9,523 | Ground water | 9 | Below the study levels |
| BELTON PWS | MO1010061 | 23,598 | Surface water purchased | 1 | Below the study levels |
| BLUE SPRINGS PWS | MO1010080 | 61,084 | Surface water purchased | 3 | Below the study levels |
| BOLIVAR PWS | MO5010085 | 11,000 | Ground water | 5 | Below the study levels |
| BONNE TERRE PRISON | MO4061410 | 3,500 | Ground water | 1 | Below the study levels |
| BOONE COUNTY CONS PWSD 1 | MO3024055 | 24,700 | Ground water | 13 | Below the study levels |
| BOONE COUNTY PWSD 4 | MO3024052 | 6,455 | Ground water | 6 | Below the study levels |
| BOONE COUNTY PWSD 9 | MO3024058 | 15,035 | Ground water | 5 | Below the study levels |
| BOONVILLE PWS | MO3010089 | 7,964 | Surface water | 1 | Below the study levels |
| BOWLING GREEN PWS | MO2010093 | 4,195 | Surface water | 2 | Below the study levels |
| BRANSON PWS | MO5010096 | 12,640 | Surface water | 8 | Below the study levels |
| BROOKFIELD PWS | MO2010105 | 4,111 | Surface water | 1 | Below the study levels |
| BUTLER COUNTY PWSD 1 | MO4024070 | 12,000 | Ground water | 5 | Below the study levels |
| BUTLER PWS | MO1010118 | 4,219 | Surface water | 1 | Below the study levels |
| CALIFORNIA PWS | MO3010124 | 4,423 | Ground water | 5 | Below the study levels |
| CALLAWAY 2 WATER DISTRICT | MO3024085 | 13,080 | Ground water | 8 | Below the study levels |
| CALLAWAY COUNTY PWSD 1 | MO3024084 | 9,840 | Ground water | 7 | Below the study levels |
| CAMDEN COUNTY PWSD 4 HORSESHOE BEND | MO3021377 | 7,912 | Ground water | 5 | Below the study levels |
| CAMDENTON PWS | MO3010130 | 3,960 | Ground water | 3 | Reached a study level |
| CAMPBELL PWS | MO4010132 | 1,562 | Ground water | 2 | Below the study levels |
| CANNON PWSD 1 | MO2024500 | 6,482 | Surface water purchased | 2 | Below the study levels |
| CAPE GIRARDEAU PWS | MO4010136 | 39,941 | Ground water | 2 | Below the study levels |
| CAPE PERRY COUNTY PWSD 1 SOUTH | MO4024096 | 8,545 | Ground water | 4 | Below the study levels |
| CARL JUNCTION PWS | MO5010138 | 8,142 | Ground water | 7 | Below the study levels |
| CARROLLTON PWS | MO2010140 | 3,514 | Ground water | 1 | Below the study levels |
| CARTHAGE PWS | MO5010142 | 14,600 | Ground water | 2 | Below the study levels |
| CARUTHERSVILLE PWS | MO4010143 | 5,518 | Ground water | 1 | Below the study levels |
| CASS COUNTY PWSD 2 | MO1024114 | 4,650 | Surface water purchased | 1 | Below the study levels |
| CASS COUNTY PWSD 9 | MO1024118 | 6,063 | Ground water purchased | 1 | Below the study levels |
| CENTRALIA PWS | MO3010152 | 4,027 | Ground water | 1 | Below the study levels |
| CHARITON LINN COUNTY PWSD 3 | MO2024128 | 5,200 | Surface water purchased | 2 | Below the study levels |
| CHARLESTON PWS | MO4010160 | 5,900 | Ground water | 1 | Below the study levels |
| CHILLICOTHE MUNICIPAL UTILITIES PWS | MO2010162 | 10,187 | Ground water | 1 | Below the study levels |
| CIRCLE C MHP | MO6048106 | 75 | Ground water | 1 | Reached a study level |
| CLARK COUNTY CONS PWSD 1 | MO2024138 | 7,140 | Ground water | 1 | Below the study levels |
| CLAY COUNTY PWSD 3 | MO1024143 | 3,447 | Ground water | 2 | Below the study levels |
| CLAY COUNTY PWSD 6 | MO1024146 | 4,912 | Surface water purchased | 1 | Below the study levels |
| CLAY COUNTY PWSD 8 | MO1024149 | 2,243 | Surface water purchased | 1 | Below the study levels |
| COLE CAMP PWS | MO3010180 | 1,150 | Ground water | 1 | Below the study levels |
| COLE COUNTY PWSD 1 | MO3024159 | 16,548 | Ground water | 7 | Below the study levels |
| COLE COUNTY PWSD 2 | MO3024160 | 13,107 | Ground water | 7 | Below the study levels |
| COLUMBIA PWS | MO3010181 | 126,254 | Ground water | 1 | Below the study levels |
| CRYSTAL CITY PWS | MO6010198 | 4,733 | Ground water | 2 | Below the study levels |
| CUBA PWS | MO6010200 | 3,292 | Ground water | 5 | Below the study levels |
| DEKALB COUNTY PWSD 1 | MO1024191 | 7,635 | Ground water purchased | 2 | Below the study levels |
| DESLOGE PWS | MO4011441 | 5,034 | Ground water | 2 | Below the study levels |
| DESOTO PWS | MO6010213 | 6,400 | Ground water | 2 | Below the study levels |
| DEXTER PWS | MO4010216 | 8,200 | Ground water | 2 | Below the study levels |
| DUNKLIN COUNTY PWSD 1 | MO4024206 | 4,307 | Ground water | 2 | Below the study levels |
| EL DORADO SPRINGS PWS | MO5010241 | 3,593 | Ground water | 3 | Below the study levels |
| ELDON PWS | MO3010240 | 4,895 | Ground water | 4 | Below the study levels |
| ELLINGTON PWS | MO4010243 | 790 | Ground water | 1 | Below the study levels |
| EXCELSIOR SPRINGS PWS | MO1010261 | 11,084 | Ground water | 1 | Below the study levels |
| FARMINGTON CORRECTIONAL CENTER | MO4069041 | 3,500 | Ground water | 2 | Below the study levels |
| FARMINGTON PWS | MO4010270 | 18,217 | Ground water | 14 | Below the study levels |
| FESTUS PWS | MO6010276 | 13,000 | Purchased ground water under influence of surface water source | 1 | Below the study levels |
| FORT LEONARD WOOD | MO3079500 | 34,000 | Surface water | 15 | Below the study levels |
| FRANKLIN COUNTY PWSD 1 | MO6024211 | 3,500 | Ground water | 4 | Below the study levels |
| FRANKLIN COUNTY PWSD 3 | MO6024213 | 8,250 | Ground water | 5 | Below the study levels |
| FREDERICKTOWN PWS | MO4010290 | 4,429 | Surface water | 1 | Below the study levels |
| FULTON PWS | MO3010296 | 12,600 | Ground water | 4 | Below the study levels |
| GAINESVILLE PWS | MO5010297 | 742 | Ground water | 4 | Below the study levels |
| GLADSTONE PWS | MO1010307 | 27,000 | Ground water | 1 | Below the study levels |
| GRAIN VALLEY PWS | MO1010320 | 16,000 | Ground water purchased | 2 | Below the study levels |
| GRUNDY COUNTY PWSD 1 | MO2024237 | 3,900 | Surface water purchased | 1 | Below the study levels |
| HANNIBAL PWS | MO2010344 | 17,108 | Surface water | 1 | Below the study levels |
| HARRISON COUNTY PWSD 2 | MO1024242 | 3,740 | Ground water | 1 | Below the study levels |
| HARRISONVILLE PWS | MO1010349 | 10,019 | Surface water | 1 | Below the study levels |
| HENRY COUNTY WATER COMPANY | MO1010177 | 11,373 | Surface water | 1 | Below the study levels |
| HERCULANEUM PWS | MO6010359 | 5,000 | Purchased ground water under influence of surface water source | 3 | Below the study levels |
| HIGGINSVILLE PWS | MO1010363 | 4,800 | Surface water | 1 | Below the study levels |
| HOLIDAY HILLS RESORT | MO5190947 | 2,065 | Ground water | 2 | Below the study levels |
| HOLLISTER PWS | MO5010374 | 4,426 | Ground water | 4 | Below the study levels |
| HOWARD COUNTY PWSD 2 | MO2024261 | 1,165 | Ground water purchased | 1 | Below the study levels |
| INDEPENDENCE PWS | MO1010399 | 120,000 | Ground water | 1 | Below the study levels |
| JACKSON COUNTY PWSD 1 | MO1024275 | 24,500 | Ground water purchased | 1 | Below the study levels |
| JACKSON COUNTY PWSD 12 | MO1024278 | 5,705 | Surface water purchased | 2 | Below the study levels |
| JACKSON COUNTY PWSD 13 | MO1024279 | 9,700 | Ground water purchased | 1 | Below the study levels |
| JACKSON COUNTY PWSD 15 | MO1024281 | 8,772 | Ground water purchased | 1 | Below the study levels |
| JACKSON COUNTY PWSD 16 | MO1020869 | 4,075 | Ground water purchased | 1 | Below the study levels |
| JACKSON COUNTY PWSD 2 | MO1024276 | 16,440 | Surface water purchased | 2 | Below the study levels |
| JACKSON PWS | MO4010404 | 15,000 | Ground water | 3 | Below the study levels |
| JASPER COUNTY PWSD 1 | MO5024286 | 5,500 | Ground water | 4 | Below the study levels |
| JEFFERSON CO PWSD 8 | MO6024300 | 4,733 | Ground water | 3 | Below the study levels |
| JEFFERSON COUNTY CONS PWSD C 1 | MO6024295 | 37,000 | Surface water purchased | 1 | Below the study levels |
| JEFFERSON COUNTY PWSD 5 | MO6024296 | 8,000 | Ground water | 5 | Below the study levels |
| JEFFERSON COUNTY PWSD 6 | MO6024298 | 7,500 | Ground water | 5 | Below the study levels |
| JEFFERSON COUNTY PWSD 7 | MO6024299 | 6,100 | Ground water | 5 | Below the study levels |
| JEFFERSON COUNTY PWSD 1 | MO6024292 | 21,113 | Surface water purchased | 1 | Below the study levels |
| JEFFERSON COUNTY PWSD 10 | MO6024302 | 10,000 | Surface water purchased | 1 | Below the study levels |
| JEFFERSON COUNTY PWSD 2 | MO6024293 | 16,548 | Surface water | 2 | Below the study levels |
| JEFFERSON COUNTY PWSD 3 | MO6024294 | 17,000 | Surface water purchased | 1 | Below the study levels |
| JOHNSON COUNTY PWSD 1 | MO1024309 | 3,730 | Ground water | 1 | Below the study levels |
| JOHNSON COUNTY PWSD 2 | MO1024310 | 12,490 | Ground water | 1 | Below the study levels |
| JOHNSON COUNTY PWSD 3 | MO1024311 | 4,700 | Ground water | 2 | Below the study levels |
| KANSAS CITY PWS | MO1010415 | 553,295 | Surface water | 2 | Below the study levels |
| KEARNEY PWS | MO1010416 | 11,500 | Surface water purchased | 2 | Below the study levels |
| KENNETT PWS | MO4010417 | 10,200 | Ground water | 1 | Below the study levels |
| KIRKSVILLE PWS | MO2010429 | 17,566 | Surface water | 1 | Below the study levels |
| KIRKWOOD PWS | MO6010430 | 28,000 | Surface water purchased | 1 | Below the study levels |
| KNOX COUNTY PUBLIC WATER & SEWER DIST 1 | MO2024313 | 3,947 | Surface water purchased | 3 | Below the study levels |
| LACLEDE COUNTY PWSD 1 | MO5024317 | 8,550 | Ground water | 5 | Below the study levels |
| LACLEDE COUNTY PWSD 3 | MO5024319 | 6,075 | Ground water | 7 | Below the study levels |
| LAF JO SALINE COUNTY CONS PWSD 2 | MO1024326 | 7,180 | Surface water purchased | 5 | Below the study levels |
| LAFAYETTE COUNTY PWSD 1 | MO1024324 | 8,250 | Ground water purchased | 1 | Below the study levels |
| LAMAR PWS | MO5010446 | 4,500 | Surface water | 1 | Below the study levels |
| LEBANON PWS | MO5010458 | 15,442 | Ground water | 6 | Below the study levels |
| LEES SUMMIT PWS | MO1010459 | 99,400 | Surface water purchased | 2 | Below the study levels |
| LEXINGTON PWS | MO1010464 | 4,729 | Ground water | 1 | Below the study levels |
| LINCOLN COUNTY PWSD 1 | MO6024340 | 14,000 | Ground water | 5 | Below the study levels |
| MACON CO PWSD 1 | MO2024363 | 12,865 | Surface water purchased | 4 | Below the study levels |
| MACON PWS | MO2010487 | 5,489 | Surface water | 1 | Below the study levels |
| MALDEN PWS | MO4010490 | 3,706 | Ground water | 3 | Below the study levels |
| MARION COUNTY PWSD 1 | MO2024377 | 4,900 | Surface water purchased | 4 | Below the study levels |
| MARSHALL PWS | MO2010502 | 12,934 | Ground water | 1 | Below the study levels |
| MARSHFIELD PWS | MO5010503 | 7,425 | Ground water | 3 | Below the study levels |
| MERCER COUNTY PWSD 1 | MO2024382 | 3,200 | Surface water purchased | 3 | Below the study levels |
| MO AMERICAN JEFFERSON CITY DISTRICT | MO3010409 | 30,075 | Surface water | 1 | Below the study levels |
| MO AMERICAN JOPLIN | MO5010413 | 73,728 | Surface water | 8 | Below the study levels |
| MO AMERICAN MEXICO | MO2010519 | 13,000 | Ground water | 1 | Below the study levels |
| MO AMERICAN PLATTE COUNTY | MO1010625 | 16,645 | Ground water | 1 | Below the study levels |
| MO AMERICAN ST JOSEPH | MO1010714 | 89,171 | Ground water | 1 | Below the study levels |
| MO AMERICAN ST LOUIS ST CHARLES COUNTIES | MO6010716 | 1,111,000 | Surface water | 6 | Below the study levels |
| MO AMERICAN TRI STATE | MO5024601 | 8,680 | Ground water | 3 | Below the study levels |
| MO AMERICAN WARRENSBURG | MO1010833 | 18,500 | Ground water | 1 | Below the study levels |
| MOBERLY PWS | MO2010533 | 13,783 | Surface water | 1 | Below the study levels |
| MONETT PWS | MO5010537 | 9,789 | Ground water | 11 | Below the study levels |
| MONROE CITY PWS, MO | MO2010538 | 2,500 | Surface water | 1 | Below the study levels |
| MONROE COUNTY PWSD 2 | MO2024402 | 6,700 | Surface water purchased | 1 | Below the study levels |
| MOUND CITY PWS | MO1010548 | 1,159 | Ground water | 1 | Below the study levels |
| MOUNT VERNON PWS | MO5010553 | 4,575 | Ground water | 5 | Below the study levels |
| NEVADA PWS | MO5010562 | 8,198 | Ground water | 1 | Below the study levels |
| NIXA PWS | MO5010576 | 24,532 | Ground water | 9 | Below the study levels |
| NODAWAY COUNTY PWSD 1 | MO1024428 | 6,428 | Surface water purchased | 1 | Below the study levels |
| NORTH KANSAS CITY PWS | MO1010580 | 4,500 | Ground water | 1 | Below the study levels |
| OAK GROVE PWS | MO1010589 | 8,289 | Ground water purchased | 1 | Below the study levels |
| ODESSA PWS | MO1010599 | 5,202 | Ground water | 1 | Below the study levels |
| OFALLON PWS | MO6010588 | 32,515 | Surface water purchased | 5 | Below the study levels |
| OZARK PWS | MO5010619 | 22,000 | Ground water | 12 | Below the study levels |
| PACIFIC PWS | MO6010620 | 6,000 | Ground water | 3 | Below the study levels |
| PALMYRA PWS | MO2010623 | 3,595 | Ground water | 1 | Below the study levels |
| PARK HILLS PWS | MO4010279 | 8,587 | Ground water | 1 | Below the study levels |
| PARK PLACE MASTER ASSN | MO3282326 | 545 | Ground water | 1 | Below the study levels |
| PECULIAR PWS | MO1010633 | 6,226 | Surface water purchased | 1 | Below the study levels |
| PEMISCOT COUNTY CON PWSD 1 | MO4024448 | 6,042 | Ground water | 4 | Below the study levels |
| PERRYVILLE PWS | MO4010636 | 8,555 | Surface water | 5 | Below the study levels |
| PIKE COUNTY PWSD 1 | MO2024471 | 7,590 | Surface water purchased | 2 | Below the study levels |
| PILOT GROVE PWS | MO3010642 | 768 | Ground water | 1 | Below the study levels |
| PLATTE CITY PWS | MO1010646 | 4,691 | Surface water purchased | 1 | Below the study levels |
| PLATTE CO PWSD 4 | MO1024478 | 9,552 | Surface water purchased | 2 | Below the study levels |
| PLATTE COUNTY CONS PWSD 1 | MO1024479 | 7,074 | Surface water purchased | 1 | Below the study levels |
| PLEASANT HILL PWS | MO1010649 | 8,262 | Surface water purchased | 2 | Below the study levels |
| POPLAR BLUFF PWS | MO4010656 | 17,043 | Surface water | 1 | Below the study levels |
| PULASKI COUNTY PWSD 1 | MO3024490 | 4,000 | Ground water | 5 | Below the study levels |
| PULASKI COUNTY PWSD 2 | MO3024491 | 8,038 | Ground water | 6 | Below the study levels |
| RAY COUNTY CONS PWSD 2 | MO1024511 | 9,360 | Ground water | 1 | Below the study levels |
| RAYMORE PWS | MO1010675 | 21,517 | Surface water purchased | 2 | Below the study levels |
| RAYTOWN WATER COMPANY | MO1010676 | 17,066 | Surface water purchased | 1 | Below the study levels |
| REPUBLIC PWS | MO5010681 | 16,100 | Ground water | 4 | Below the study levels |
| RICHMOND PWS | MO1010685 | 5,797 | Ground water | 1 | Below the study levels |
| ROLLA PWS | MO3010700 | 20,800 | Ground water | 18 | Below the study levels |
| S K & M WATER AND SEWER COMPANY | MO4036226 | 750 | Ground water | 2 | Below the study levels |
| SALEM PWS | MO4010721 | 4,736 | Ground water | 4 | Below the study levels |
| SAVANNAH PWS | MO1010724 | 5,249 | Ground water | 1 | Below the study levels |
| SCHUYLER COUNTY CONSOLIDATED PWSD 1 | MO2024559 | 3,482 | Surface water purchased | 1 | Below the study levels |
| SCOTLAND COUNTY CONS PWSD 1 | MO2024565 | 3,360 | Surface water purchased | 1 | Below the study levels |
| SEDALIA PWS | MO3010728 | 21,725 | Ground water | 5 | Below the study levels |
| SHELBYVILLE PWS | MO2010737 | 552 | Surface water purchased | 1 | Below the study levels |
| SIKESTON PWS | MO4010743 | 16,291 | Ground water | 3 | Below the study levels |
| SPRINGFIELD PWS | MO5010754 | 210,898 | Surface water | 3 | Below the study levels |
| ST CHARLES CO PWSD #2 WRIGHT CITY | MO6010874 | 3,550 | Ground water | 2 | Below the study levels |
| ST CHARLES COUNTY PWSD 2 | MO6024530 | 100,587 | Surface water purchased | 4 | Below the study levels |
| ST CHARLES PWS | MO6010707 | 78,961 | Surface water purchased | 2 | Below the study levels |
| ST CLAIR PWS | MO6010708 | 4,700 | Ground water | 7 | Below the study levels |
| ST JAMES PWS | MO3010712 | 3,935 | Ground water | 4 | Reached a study level |
| ST LOUIS CITY PWS | MO6010715 | 304,709 | Surface water | 2 | Below the study levels |
| ST PETERS PWS | MO6010719 | 52,575 | Surface water purchased | 2 | Reached a study level |
| ST ROBERT PWS | MO3010720 | 5,192 | Ground water | 6 | Reached a study level |
| STE GENEVIEVE COUNTY PWSD 1 SC | MO4024543 | 3,718 | Ground water | 5 | Below the study levels |
| STE GENEVIEVE PWS | MO4010710 | 4,999 | Ground water | 1 | Below the study levels |
| SULLIVAN PWS | MO6010775 | 7,081 | Ground water | 7 | Below the study levels |
| TANEY COUNTY PWSD 2 | MO5024600 | 6,250 | Ground water | 5 | Below the study levels |
| TANEY COUNTY PWSD 3 | MO5024602 | 6,000 | Ground water | 10 | Below the study levels |
| TIPTON PWS | MO3010791 | 2,861 | Ground water | 2 | Below the study levels |
| TREEHOUSE CONDOMINIUMS | MO5036352 | 445 | Ground water | 2 | Below the study levels |
| TRENTON MUNICIPAL UTILITIES PWS | MO2010796 | 5,600 | Surface water | 1 | Below the study levels |
| TROY PWS | MO6010798 | 15,000 | Ground water | 5 | Below the study levels |
| UNION PWS | MO6010801 | 12,348 | Ground water | 6 | Below the study levels |
| UNIVERSITY OF MISSOURI COLUMBIA | MO3069001 | 40,000 | Ground water | 5 | Below the study levels |
| VERNON COUNTY CONS PWSD 1 | MO5024618 | 9,615 | Ground water | 4 | Below the study levels |
| WARRENTON PWS | MO6010834 | 8,208 | Ground water | 5 | Below the study levels |
| WASHINGTON PWS | MO6010838 | 14,068 | Ground water | 10 | Below the study levels |
| WAYNESVILLE PWS | MO3010841 | 5,460 | Ground water | 7 | Below the study levels |
| WEBB CITY PWS | MO5010844 | 13,404 | Surface water purchased | 7 | Below the study levels |
| WEST PLAINS PWS | MO4010853 | 12,864 | Groundwater under influence of surface water | 1 | Below the study levels |
| WESTMIER SUBDIVISION | MO6031324 | 90 | Ground water | 1 | Below the study levels |
| WHITEMAN AIR BASE | MO1079501 | 10,106 | Ground water | 1 | Below the study levels |
| WILLARD PWS | MO5010860 | 8,400 | Ground water | 4 | Below the study levels |
| Wentzville | MO6010849 | 41,784 | Ground water | 3 | Below the study levels |
How the count works
What is included
Each active community water system with complete monitoring 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. This page does not apply Missouri's state-specific standards or determine compliance. Use the official state or territory drinking-water program for current regulatory information.