Uranium in drinking water
Natural in granite and some western aquifers.
Health: Kidney toxicity and cancer risk.
Across the US
171 community water systems had at least one health-based Uranium violation since 2016. Routine Uranium sample results are reported to states, not to EPA's national database, so this page ranks systems by violations rather than levels.
Most violations
| Water system | People | Violations |
|---|---|---|
| Rosemount Water Company | 54 | 73 |
| Mission Creek Water Association | 263 | 69 |
| Pecan Tree Water Association | 22 | 57 |
| Town of Whitehall | 1,500 | 55 |
| Santa Cruz Water Association | 394 | 49 |
| Guatay Mutual Benefit Corporation | 100 | 47 |
| CSA 70 W-3 Hacienda | 611 | 42 |
| CSA 70-F Morongo | 300 | 42 |
| Jim Wells County Fresh Water Supply District 1 | 1,950 | 39 |
| Rainbird Valley Mutual Water Company | 238 | 39 |
| Valley Estates Water System | 68 | 38 |
| Del Oro River Island Serv Terr #1 Water System | 1,277 | 36 |
| Knoll Enterprises Water System | 500 | 36 |
| Daggett Comm Svcs District | 795 | 35 |
| Country View MHP | 54 | 33 |
| R.S. Mutual Water Company | 35 | 33 |
| Village of Phillips | 385 | 32 |
| Village of Martinsburg | 78 | 31 |
| Descanso Community Water District | 870 | 29 |
| Round Mountain Water Company | 50 | 29 |
| Lebec County Water District | 1,379 | 28 |
| Riviera Water Control & Improvement District | 936 | 28 |
| Ojo Caliente MDWCA | 226 | 28 |
| Town North Estates Water System | 216 | 28 |
| Alpine Village Water System | 198 | 27 |
States with the most systems with violations
- California: 46
- New Hampshire: 16
- New Mexico: 14
- Texas: 13
- Idaho: 9
- Arizona: 9
- Georgia: 9
- North Carolina: 9
- Oklahoma: 7
- Nebraska: 6
- Colorado: 6
- Kansas: 5
Sources
The limits, health goals and health effects on this page come from these EPA sources. The results come from EPA's monitoring data for each water system.
- EPA: National Primary Drinking Water Regulations (limits and health effects table)
- EPA ECHO: Safe Drinking Water Information System data
This page summarizes public regulatory information. It is not medical advice. How we source and check this site.
Questions
What is the safe level of Uranium in drinking water?
The federal legal limit (MCL) is 30 ppb. EPA's health goal (MCLG), the level with no known risk, is zero.
How do I remove Uranium from tap water?
See the filter guidance on this page: look for a product certified for Uranium specifically, and check the claim in NSF's certified product listings.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.