EPA drinking water rule · 121
Surface Water Treatment Rule
See how this rule appears in the reported histories and find systems with unresolved health-based records.
- Violation records shown
- 8,323
- Systems with a linked record
- 1,501
- Unresolved health-based records
- 169
Rule records by EPA-listed state
| Listed state | Systems | Violation records | Unresolved health-based records |
|---|---|---|---|
| Alabama | 1 | 1 | 0 |
| Alaska | 100 | 2,195 | 5 |
| American Samoa | 1 | 23 | 1 |
| Arizona | 42 | 156 | 0 |
| Arkansas | 9 | 29 | 0 |
| California | 57 | 680 | 17 |
| Colorado | 269 | 903 | 0 |
| Connecticut | 3 | 5 | 0 |
| District of Columbia | 2 | 10 | 0 |
| Georgia | 3 | 3 | 0 |
| Idaho | 29 | 60 | 1 |
| Illinois | 3 | 3 | 0 |
| Indiana | 1 | 1 | 0 |
| Iowa | 7 | 9 | 0 |
| Kansas | 36 | 106 | 0 |
| Kentucky | 5 | 13 | 0 |
| Louisiana | 9 | 71 | 0 |
| Maine | 5 | 7 | 0 |
| Maryland | 3 | 3 | 0 |
| Massachusetts | 4 | 5 | 0 |
| Michigan | 7 | 14 | 0 |
| Minnesota | 2 | 7 | 0 |
| Missouri | 21 | 38 | 0 |
| Montana | 24 | 126 | 22 |
| Nebraska | 1 | 2 | 0 |
| Nevada | 1 | 2 | 0 |
| New Hampshire | 6 | 9 | 0 |
| New Jersey | 72 | 142 | 0 |
| New Mexico | 20 | 129 | 2 |
| New York | 27 | 92 | 26 |
| North Carolina | 5 | 8 | 0 |
| North Dakota | 3 | 9 | 0 |
| Ohio | 7 | 10 | 0 |
| Oklahoma | 56 | 319 | 0 |
| Oregon | 107 | 1,661 | 3 |
| Pennsylvania | 204 | 571 | 0 |
| Puerto Rico | 99 | 129 | 69 |
| South Carolina | 15 | 20 | 0 |
| South Dakota | 14 | 38 | 0 |
| Tennessee | 8 | 16 | 0 |
| Texas | 57 | 202 | 4 |
| Virginia | 1 | 1 | 0 |
| Washington | 30 | 123 | 16 |
| West Virginia | 104 | 328 | 2 |
| Wyoming | 21 | 44 | 1 |
Systems with unresolved health-based records for this rule
- ACEITUNA IIPR0476234 · Puerto Rico · 1 unresolved health-based records for this rule
- ACEITUNA IIIPR0476324 · Puerto Rico · 1 unresolved health-based records for this rule
- ACUED. BO. GUAYABOTAPR0677076 · Puerto Rico · 1 unresolved health-based records for this rule
- ACUED. CAÑABON SECTOR EL PARQUEPR0510225 · Puerto Rico · 1 unresolved health-based records for this rule
- ACUED. COM. BO. QUEBRADILLASPR0510095 · Puerto Rico · 1 unresolved health-based records for this rule
- ACUED. COM. BO. SIERRA ALTA SECT. CACAOPR0478114 · Puerto Rico · 1 unresolved health-based records for this rule
- ACUED. COMUNAL SECT. SANTAS PASCUAS, INCPR0458034 · Puerto Rico · 1 unresolved health-based records for this rule
- ACUED. COMUNIDAD 18PR0666116 · Puerto Rico · 1 unresolved health-based records for this rule
- ACUED. DE LA COM. DEL DUQUEPR0653056 · Puerto Rico · 1 unresolved health-based records for this rule
- ACUED. LA GRAMAPR0272082 · Puerto Rico · 1 unresolved health-based records for this rule
- ACUED. RURAL SECT. EL VEINTEPR0677196 · Puerto Rico · 1 unresolved health-based records for this rule
- ACUEDUCTO COMUNAL ELADIO ANDREU INC.PR0724117 · Puerto Rico · 1 unresolved health-based records for this rule
- ACUEDUCTO COMUNAL SAN JOSEPR0457064 · Puerto Rico · 1 unresolved health-based records for this rule
- ACUEDUCTO COMUNIDAD BO. RUBIASPR0478014 · Puerto Rico · 1 unresolved health-based records for this rule
- ACUEDUCTO LA ESTANCIA, INC.PR0272292 · Puerto Rico · 1 unresolved health-based records for this rule
- ACUEDUCTO LA HACIENDA DAMIAN ABAJO, INCPR0455014 · Puerto Rico · 1 unresolved health-based records for this rule
- ACUEDUCTO LA MONTANA INC.PR0478034 · Puerto Rico · 1 unresolved health-based records for this rule
- ACUEDUCTO RURAL SAN JOSEPR0754127 · Puerto Rico · 1 unresolved health-based records for this rule
- ADAK UTILITIESAK2260595 · Alaska · 1 unresolved health-based records for this rule
- ALTURAS DE COLLORESPR0238032 · Puerto Rico · 1 unresolved health-based records for this rule
- ALTURAS PIZAPR0238002 · Puerto Rico · 1 unresolved health-based records for this rule
- ANON CARMELITAPR0458194 · Puerto Rico · 1 unresolved health-based records for this rule
- ASOCIACION ACUEDUCTO REVENTONPR0401294 · Puerto Rico · 1 unresolved health-based records for this rule
- BARKSDALE WSCTX0690011 · Texas · 1 unresolved health-based records for this rule
- BO.QUEBRADA ARRIBAPR0556035 · Puerto Rico · 1 unresolved health-based records for this rule
- BRANSCOMB MOBILE HOME PARKCA2300663 · California · 2 unresolved health-based records for this rule
- BURNT RANCH ESTATESCA5304109 · California · 1 unresolved health-based records for this rule
- CANYON CITY WATER DEPARTMENTOR4100165 · Oregon · 1 unresolved health-based records for this rule
- CASSIE WATER SYSTEMTX0270047 · Texas · 2 unresolved health-based records for this rule
- CAZADERO WATER COMPANY, INC. (PUC)CA4900508 · California · 3 unresolved health-based records for this rule
- Central ASGAS9711948 · American Samoa · 1 unresolved health-based records for this rule
- CERROTEPR0478044 · Puerto Rico · 1 unresolved health-based records for this rule
- COM. CACAO - LA SAPIAPR0455044 · Puerto Rico · 1 unresolved health-based records for this rule
- COMUNIDAD CHORRERASPR0272142 · Puerto Rico · 1 unresolved health-based records for this rule
- COMUNIDAD EDEMPR0666126 · Puerto Rico · 1 unresolved health-based records for this rule
- COMUNIDAD EL FRIOPR0476334 · Puerto Rico · 1 unresolved health-based records for this rule
- COMUNIDAD JUAN DIEGOPR0627016 · Puerto Rico · 1 unresolved health-based records for this rule
- COMUNIDAD MENDEZPR0364063 · Puerto Rico · 1 unresolved health-based records for this rule
- COMUNIDAD SANTA BARBARAPR0238072 · Puerto Rico · 1 unresolved health-based records for this rule
- COREA METRALLAPR0457094 · Puerto Rico · 1 unresolved health-based records for this rule
- CORPORACION PRO SALUD Y MEJORAPR0457044 · Puerto Rico · 1 unresolved health-based records for this rule
- CUBUY-MARINESPR0115011 · Puerto Rico · 1 unresolved health-based records for this rule
- DENTON TOWN OFMT0000199 · Montana · 1 unresolved health-based records for this rule
- EL MALTILLOPR0457024 · Puerto Rico · 1 unresolved health-based records for this rule
- EL TESOROPR0458234 · Puerto Rico · 1 unresolved health-based records for this rule
- FLORISTON WATER SYSTEMCA2900502 · California · 1 unresolved health-based records for this rule
- G AND E MHPWV3300201 · West Virginia · 1 unresolved health-based records for this rule
- GUARAGUAOPR0439034 · Puerto Rico · 1 unresolved health-based records for this rule
- HACIENDA PLANELLPR0242032 · Puerto Rico · 1 unresolved health-based records for this rule
- HACIENDA RULLANPR0272102 · Puerto Rico · 1 unresolved health-based records for this rule
- HEART BUTTE SCHOOL083090009 · Montana · 1 unresolved health-based records for this rule
- HERKIMER VILLAGENY2102306 · New York · 21 unresolved health-based records for this rule
- KARLUK WATER SYSTEMAK2250087 · Alaska · 1 unresolved health-based records for this rule
- LA CARMELITAPR0458304 · Puerto Rico · 1 unresolved health-based records for this rule
- LA CASCADA MILAGROSAPR0272162 · Puerto Rico · 1 unresolved health-based records for this rule
- LA CUESTAPR0422074 · Puerto Rico · 1 unresolved health-based records for this rule
- LA JARA WATER USERS ASSOCIATIONNM3509223 · New Mexico · 1 unresolved health-based records for this rule
- LA JULITAPR0476054 · Puerto Rico · 1 unresolved health-based records for this rule
- LAS MESASPR0458004 · Puerto Rico · 1 unresolved health-based records for this rule
- LAUREL COMMUNITY LEAGUECA4400528 · California · 1 unresolved health-based records for this rule
- LISECCWA5343290 · Washington · 1 unresolved health-based records for this rule
- LOS BARROSPR0530045 · Puerto Rico · 1 unresolved health-based records for this rule
- LOS BARROS MARINPR0556045 · Puerto Rico · 1 unresolved health-based records for this rule
- MACANEA / ESPINOPR0666026 · Puerto Rico · 1 unresolved health-based records for this rule
- MCNEIL ISLAND WATERWA5352900 · Washington · 5 unresolved health-based records for this rule
- MESCAL CREEK WATER, INCCA1900147 · California · 1 unresolved health-based records for this rule
- NIKOLSKI VILLAGEAK2260278 · Alaska · 1 unresolved health-based records for this rule
- ORIENT WATER COMPANYWA5364300 · Washington · 10 unresolved health-based records for this rule
- ORLEANS C.S.D.CA1200729 · California · 1 unresolved health-based records for this rule
- PALOMAS IIPR0523025 · Puerto Rico · 1 unresolved health-based records for this rule
- PALOMINO ESTATES WATER COMPANYCA1206002 · California · 1 unresolved health-based records for this rule
- PANDURAPR0457054 · Puerto Rico · 1 unresolved health-based records for this rule
- PELCHASPR0431014 · Puerto Rico · 1 unresolved health-based records for this rule
- PERICHEPR0364013 · Puerto Rico · 1 unresolved health-based records for this rule
- PHILADELPHIA VILLAGENY2202341 · New York · 1 unresolved health-based records for this rule
- PHILIPSBURG TOWN OFMT0000304 · Montana · 18 unresolved health-based records for this rule
- PLATINUM CITY WATER SYSTEMAK2271059 · Alaska · 1 unresolved health-based records for this rule
- PORT PROTECTIONAK2121123 · Alaska · 1 unresolved health-based records for this rule
- PORTILLO - MIRAMARPR0439044 · Puerto Rico · 1 unresolved health-based records for this rule
- PUENTE HOUSING SOLUTIONSCA4100610 · California · 1 unresolved health-based records for this rule
- QUEBRADA ARENASPR0549015 · Puerto Rico · 1 unresolved health-based records for this rule
- RAMBLE RIDGE SUBDIVISIONTX0460243 · Texas · 1 unresolved health-based records for this rule
- REDWOOD HEIGHTS MUTUAL WATER COMPANYCA4900639 · California · 1 unresolved health-based records for this rule
- RICHFIELD SPRINGS VILLAGENY3800156 · New York · 1 unresolved health-based records for this rule
- RIO EMBUDO MDWCANM3500721 · New Mexico · 1 unresolved health-based records for this rule
- ROCK CREEK MUTUAL WATER CO.CA0800529 · California · 2 unresolved health-based records for this rule
- ROSE LAKE WATER ASSNID1280161 · Idaho · 1 unresolved health-based records for this rule
- SALTOS CAGUANAPR0272272 · Puerto Rico · 1 unresolved health-based records for this rule
- SALYER HEIGHTS W.S., INCCA5304502 · California · 1 unresolved health-based records for this rule
- SANTA BARBARA IIPR0238122 · Puerto Rico · 1 unresolved health-based records for this rule
- SANTA ROSAPR0238022 · Puerto Rico · 1 unresolved health-based records for this rule
- SECTOR LAGUNAPR0377023 · Puerto Rico · 1 unresolved health-based records for this rule
- SERVICIO DE AGUAPR0458174 · Puerto Rico · 1 unresolved health-based records for this rule
- SIERRITAPR0476204 · Puerto Rico · 1 unresolved health-based records for this rule
- SIST. RURAL GRAULAUPR0272252 · Puerto Rico · 1 unresolved health-based records for this rule
- SIX ACRES WATER COMPANYCA4900608 · California · 1 unresolved health-based records for this rule
- SUMNER WATER CORPORATIONOR4100209 · Oregon · 1 unresolved health-based records for this rule
- TICONDEROGA WDNY1500293 · New York · 1 unresolved health-based records for this rule
- TURNERVILLE WATER AND SEWER DISTRICTWY5601115 · Wyoming · 1 unresolved health-based records for this rule
- VACAS IIPR0476124 · Puerto Rico · 1 unresolved health-based records for this rule
- VACAS IIIPR0476134 · Puerto Rico · 1 unresolved health-based records for this rule
- VECINOS CAMINO LUIS LEBRON INCPR0518075 · Puerto Rico · 1 unresolved health-based records for this rule
- VEGUITAPR0272262 · Puerto Rico · 1 unresolved health-based records for this rule
- VEGUITAS GRIPINASPR0238082 · Puerto Rico · 1 unresolved health-based records for this rule
- VILLA BLANCAPR0476064 · Puerto Rico · 1 unresolved health-based records for this rule
- VISTA ALEGREPR0476154 · Puerto Rico · 1 unresolved health-based records for this rule
- VIVI ABAJOPR0272012 · Puerto Rico · 1 unresolved health-based records for this rule
- WARDENSVILLE, TOWN OFWV3301603 · West Virginia · 1 unresolved health-based records for this rule
- WATSONVILLE WATER SYSTEMOR4105302 · Oregon · 1 unresolved health-based records for this rule
- WELLESLEY ISLAND WATER CORP.NY2220914 · New York · 1 unresolved health-based records for this rule
- WESTCHESTER JOINT WATER WORKSNY5903435 · New York · 1 unresolved health-based records for this rule
- WILSALL WATER DISTRICTMT0000362 · Montana · 1 unresolved health-based records for this rule
- WORDEN BALLANTINE YELLOWSTONEMT0000022 · Montana · 1 unresolved health-based records for this rule
- ZAMASPR0238012 · Puerto Rico · 1 unresolved health-based records for this rule
EPA data and scope
How to read the records
The enforcement snapshot is federal fiscal 2026Q3. The EPA archive labels its violation file October 13, 2026. EPA says federal reporting can lag by several months. For current advisories, check your utility or local drinking-water authority.
- We matched active community water systems by public water system ID between EPA’s system search and SDWIS inventory. We show violations with a recorded noncompliance, initial reporting or return-to-compliance date from 2021 onward, plus earlier records listed as Addressed or Unaddressed.
- EPA’s health-based flag identifies violations of contaminant or disinfectant limits or treatment requirements. Monitoring and reporting violations describe required tests or reports. Neither category measures household exposure.
- Addressed means EPA records formal enforcement on a violation that remains unresolved in the snapshot. Unaddressed means no formal action is recorded for an unresolved violation. Resolved can mean compliance was restored, the rule ceased to apply, or further action was unnecessary. Archived is a separate status.
- We count a violation once per water system and group its distinct linked actions. Conflicting records are set aside. Places are EPA-listed search locations and can include mailing locations. Use the provider name and system ID to identify your service.
EPA data dictionary and files · EPA reporting and enforcement FAQ · Find an annual water quality report · How to get the report from your utility