Sistemas de agua de California con más infracciones relacionadas con la salud sin resolver — 2026
Empresas de agua comunitarias de California clasificadas por infracciones federales relacionadas con la salud del agua potable abiertas en los registros de cumplimiento SDWIS de la EPA, con contexto demográfico de la Encuesta sobre la Comunidad Estadounidense del Censo.
clasificados
con datos demográficos
Censo ACS
de CWS (marzo de 2026)
These 48 California water utilities carry the most open federal health-based violations in EPA's enforcement records. Sorted by unresolved count; demographic context from the U.S. Census is shown alongside but is not a ranking input.
| Rank | Water System | State | Pop served | Unresolved health violations | Health viol. (5yr) | % PoC served | % Below 200% FPL | Last violation |
|---|---|---|---|---|---|---|---|---|
| 1 | City of Lindsay | California | 10,929 | 32 | 33 | 86% | 51% | 2025-10-01 |
| 2 | City of Hughson | California | 6,241 | 21 | 21 | 44% | 23% | 2025-07-01 |
| 3 | City of Dos Palos | California | 7,477 | 14 | 14 | 82% | 52% | 2025-07-01 |
| 4 | City of Lemoore | California | 25,315 | 13 | 13 | 63% | 34% | 2025-07-02 |
| 5 | City of Avenal | California | 4,483 | 6 | 6 | 92% | 58% | 2024-10-17 |
| 6 | City of Calistoga | California | 5,264 | 5 | 8 | 45% | 21% | 2025-06-01 |
| 7 | Oildale Mwc | California | 27,600 | 5 | 5 | 44% | 43% | 2024-10-01 |
| 8 | Suisun-Solano Water Authority | California | 28,675 | 3 | 11 | 78% | 24% | 2024-10-17 |
| 9 | Signal Hill - City, Water Department | California | 5,254 | 2 | 5 | 75% | 28% | 2025-04-01 |
| 10 | City of Stockton | California | 178,113 | 2 | 2 | 79% | 33% | 2024-01-01 |
| 11 | Yucaipa Valley Water District | California | 60,758 | 2 | 2 | 45% | 25% | 2024-07-01 |
| 12 | City of Livingston | California | 12,677 | 2 | 2 | 90% | 42% | 2024-10-17 |
| 13 | Winton Water & Sanitary District | California | 8,672 | 2 | 2 | 83% | 43% | 2024-10-17 |
| 14 | Yosemite Spring Park Util Company | California | 3,941 | 1 | 8 | 27% | 22% | 2025-10-06 |
| 15 | East Niles Csd | California | 31,094 | 1 | 3 | 78% | 45% | 2024-10-17 |
| 16 | Scwa - Laguna/Vineyard | California | 145,429 | 1 | 1 | 69% | 19% | 2024-10-17 |
| 17 | City of Fairfield | California | 101,593 | 1 | 1 | 72% | 25% | 2024-10-17 |
| 18 | City of Porterville | California | 48,713 | 1 | 1 | 79% | 49% | 2024-10-17 |
| 19 | City of Los Banos | California | 43,989 | 1 | 1 | 80% | 39% | 2024-10-17 |
| 20 | City of Ceres | California | 36,788 | 1 | 1 | 78% | 39% | 2024-10-17 |
| 21 | City of Calexico | California | 36,151 | 1 | 1 | 98% | 49% | 2024-10-17 |
| 22 | Monterey Park-City, Water Department | California | 34,690 | 1 | 1 | 94% | 35% | 2024-10-17 |
| 23 | City of Sanger | California | 24,321 | 1 | 1 | 75% | 34% | 2024-10-17 |
| 24 | City of Riverbank | California | 23,782 | 1 | 1 | 67% | 32% | 2021-11-01 |
| 25 | San Lorenzo Valley Water District | California | 22,610 | 1 | 1 | 23% | 15% | 2024-10-17 |
| 26 | City of Dinuba | California | 22,497 | 1 | 1 | 89% | 51% | 2024-10-17 |
| 27 | City of Oakdale | California | 21,894 | 1 | 1 | 39% | 24% | 2024-10-17 |
| 28 | City of Norco | California | 19,642 | 1 | 1 | 52% | 15% | 2025-07-01 |
| 29 | City of West Sacramento | California | 17,951 | 1 | 1 | 60% | 31% | 2024-10-17 |
| 30 | Bakman Water Company | California | 15,252 | 1 | 1 | 82% | 35% | 2024-10-17 |
| 31 | City of Imperial | California | 13,335 | 1 | 1 | 89% | 33% | 2024-10-17 |
| 32 | City of Parlier | California | 12,388 | 1 | 1 | 97% | 58% | 2024-10-17 |
| 33 | City of Tehachapi | California | 12,224 | 1 | 1 | 45% | 25% | 2024-10-17 |
| 34 | City of Anderson | California | 10,358 | 1 | 1 | 26% | 35% | 2024-10-17 |
| 35 | Arvin Community Services District | California | 9,637 | 1 | 1 | 96% | 64% | 2024-10-17 |
| 36 | City of Orange Cove | California | 7,563 | 1 | 1 | 95% | 58% | 2024-10-17 |
| 37 | City of Farmersville | California | 7,495 | 1 | 1 | 84% | 57% | 2024-10-17 |
| 38 | Earlimart PUD | California | 7,202 | 1 | 1 | 98% | 58% | 2024-10-17 |
| 39 | Yreka, City of | California | 6,610 | 1 | 1 | 22% | 43% | 2024-10-17 |
| 40 | City of Fort Bragg | California | 6,417 | 1 | 1 | 33% | 40% | 2024-10-17 |
| 41 | City of Gridley | California | 6,034 | 1 | 1 | 41% | 39% | 2024-10-17 |
| 42 | Awa, Ione | California | 5,156 | 1 | 1 | 34% | 15% | 2024-12-01 |
| 43 | Folsom State Prison | California | 5,008 | 1 | 1 | 85% | 0% | 2024-10-17 |
| 44 | Solvang Water Division | California | 4,913 | 1 | 1 | 28% | 15% | 2024-03-27 |
| 45 | City of Gustine | California | 4,752 | 1 | 1 | 70% | 39% | 2024-10-17 |
| 46 | Ivanhoe Public Utility District | California | 4,086 | 1 | 1 | 88% | 47% | 2024-10-17 |
| 47 | Bear Valley Csd | California | 4,007 | 1 | 1 | 31% | 24% | 2024-10-17 |
| 48 | Slvwd - Felton Water System | California | 3,530 | 1 | 1 | 23% | 16% | 2025-09-01 |
How to read this ranking
Each row links to a full utility profile with violation history, lead testing results, and service-area ZIPs. The demographic context columns are from independent data sources (ACS, not EJScreen) and are provided for readers who want to examine equity patterns alongside the operational data.
See the full methodology for calculation details, data vintages, and known limitations.
Frequently asked questions
What is an unresolved health-based violation?
A violation of a federal Safe Drinking Water Act standard (Maximum Contaminant Level, Treatment Technique, or Monitoring requirement for a health-based contaminant) that has not been formally returned to compliance in EPA records. These reflect ongoing public-health concerns documented in EPA's ECHO enforcement database.
Why show demographic context next to violations?
Federal Safe Drinking Water Act data does not distinguish between communities by race or income — violations are violations regardless of who is served. We publish demographic columns so readers can independently examine whether specific systems with long-running violations also serve disproportionately low-income or non-white populations. We do not claim causation; we report two independent facts side by side.
Are these the most dangerous water systems in the country?
Not necessarily. "Unresolved" counts procedural and technical violations alongside contaminant exceedances. A high count indicates a system that federal regulators have flagged repeatedly without resolution. For any specific system, click through to its profile page for the individual violations on record.
Where does the data come from?
Violation records come from EPA's Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database, refreshed weekly. Demographic context comes from the U.S. Census American Community Survey (ACS) 5-year estimates (2019-2023), aggregated from block-group level to utility-level using EPA's Community Water System Service Area Boundaries v3 population weights.
ZipCheckup es una herramienta independiente de datos públicos. Somos un servicio de referencia, no un proveedor de pruebas de agua, remediación ni servicios públicos. Las clasificaciones reflejan datos federales de acceso público y se ofrecen con fines informativos. Para problemas con su sistema de agua específico, el proveedor local de agua o el programa estatal de agua potable son los puntos de contacto adecuados.