Combined Uranium in U.S. Drinking Water
Health-based violation data for Combined Uranium from EPA Safe Drinking Water Information System (SDWIS). Covers all community water systems with violations on record.
Combined Uranium has been found in violation of EPA standards in 272 water systems across 25 states, with 6,099 total health-based violations recorded. The most affected states are California, Texas, New Mexico.
Combined Uranium is regulated under the EPA Safe Drinking Water Act, which sets enforceable Maximum Contaminant Levels (MCLs) and associated treatment technique requirements for public water systems. The EPA Safe Drinking Water Information System (SDWIS) tracks every recorded violation nationwide and links it back to the specific public water system (PWSID), violation type, and begin date.
Across the United States, PlainEnviro's joined extract contains 6,099 health-based violation records carrying Combined Uranium (EPA code 4006) across 272 active community water systems in 25 states. Raw record counts are highest in California, Texas, New Mexico, with California accounting for 1,646 records across 53 systems. Health-effect prose is shown only when the official ECHO substance name matches a verified topic; otherwise the portal stays silent rather than inventing guidance.
A health-based violation does not mean residents were necessarily harmed, it means the contaminant exceeded the federal MCL in a compliance sample, triggering notification and remediation requirements. States and utilities maintain primary enforcement responsibility. To check the status of a specific water system, request its most recent Consumer Confidence Report or consult the EPA's Drinking Water Watch portal for the corresponding state.
Violations by State
States ranked by number of health-based violations for Combined Uranium.
| # | State | Violations | Systems Affected |
|---|---|---|---|
| 1 | California | 1,646 | 53 |
| 2 | Texas | 520 | 15 |
| 3 | New Mexico | 393 | 15 |
| 4 | Nebraska | 273 | 9 |
| 5 | Oklahoma | 232 | 10 |
| 6 | Idaho | 227 | 9 |
| 7 | Nevada | 227 | 4 |
| 8 | Colorado | 160 | 8 |
| 9 | Georgia | 158 | 10 |
| 10 | Kansas | 135 | 5 |
| 11 | Montana | 107 | 2 |
| 12 | Arizona | 104 | 7 |
| 13 | Missouri | 84 | 3 |
| 14 | New Hampshire | 81 | 15 |
| 15 | North Carolina | 60 | 7 |
| 16 | Alaska | 54 | 1 |
| 17 | New York | 52 | 4 |
| 18 | Florida | 34 | 2 |
| 19 | Vermont | 24 | 2 |
| 20 | Wyoming | 22 | 3 |
| 21 | Virginia | 21 | 2 |
| 22 | Washington | 12 | 2 |
| 23 | Maine | 8 | 3 |
| 24 | Connecticut | 2 | 1 |
| 25 | South Dakota | 1 | 1 |
Most Affected Water Systems
Top 50 water systems by number of Combined Uranium health-based violations.
Frequently Asked Questions
Is Combined Uranium in my water?
Combined Uranium has been detected in violation of EPA health standards in 272 water systems across 25 states. To check your specific utility, look up your annual Consumer Confidence Report (CCR) - water systems are required to disclose all violations.
How many water systems have Combined Uranium violations?
EPA SDWIS records show 272 community water systems with health-based Combined Uranium violations, totaling 6,099 violations. These represent cases where the contaminant exceeded the EPA Maximum Contaminant Level (MCL).
Which states have the most Combined Uranium violations?
The states with the most Combined Uranium violations are: California (1,646 violations), Texas (520 violations), New Mexico (393 violations), Nebraska (273 violations), Oklahoma (232 violations).
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About This Data
Violation data is from the EPA Safe Drinking Water Information System (SDWIS). Only health-based violations are shown, these include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations. Monitoring and reporting violations are excluded. Data may not reflect the most current enforcement actions.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.