Is Your Drinking Water Safe?
EPA violation data for 17,254 cities across 51 states
Every public water system in the US is required to meet EPA safety standards. When they don't, violations are recorded. We make that data searchable and transparent.
States with Most Drinking Water Violations
States ranked by total number of EPA Safe Drinking Water Act violations on record.
| # | State | Violations | Health-Based | Water Systems | Cities |
|---|---|---|---|---|---|
| 1 | Texas | 263,180 | 39,140 | 4,713 | 1238 |
| 2 | Pennsylvania | 199,265 | 6,042 | 1,855 | 733 |
| 3 | Oklahoma | 128,472 | 29,472 | 889 | 488 |
| 4 | New York | 93,834 | 5,682 | 2,245 | 795 |
| 5 | West Virginia | 81,622 | 2,703 | 412 | 204 |
| 6 | Alaska | 73,527 | 5,020 | 405 | 157 |
| 7 | Utah | 71,655 | 0 | 559 | 2 |
| 8 | Ohio | 61,604 | 0 | 1,094 | 0 |
| 9 | Arizona | 60,414 | 4,414 | 751 | 159 |
| 10 | Washington | 54,459 | 2,509 | 2,311 | 336 |
| 11 | North Carolina | 54,399 | 3,287 | 1,979 | 448 |
| 12 | Colorado | 42,596 | 5,256 | 1,048 | 313 |
| 13 | California | 39,276 | 18,881 | 2,819 | 818 |
| 14 | New Mexico | 37,115 | 7,761 | 555 | 220 |
| 15 | Florida | 36,335 | 3,132 | 1,593 | 451 |
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About This Data
Clean Water Index uses data from the EPA's Safe Drinking Water Information System (SDWIS), the federal database that tracks compliance of public water systems with drinking water standards. When a water system exceeds the Maximum Contaminant Level (MCL) for a regulated substance, or fails to properly test and report, a violation is recorded.
Not all violations are equal. Health-based violations (MCL and Treatment Technique violations) mean a contaminant was found above safe levels. Monitoring violations mean the system failed to test when required — which may indicate a problem or may simply be a reporting failure.
This data is updated quarterly. For the most current information about your specific water system, contact your local water utility or check the EPA ECHO database directly.
Data Sources
All data from the EPA Safe Drinking Water Information System (SDWIS) via the Envirofacts API. Community water systems serving 100+ people are included.