Fluoride in drinking water
Added at about 0.7 mg/L in many systems and also natural, sometimes far higher. Limit 4 mg/L.
Health: Above 4 mg/L can cause skeletal fluorosis. Above 2 mg/L can mottle children's teeth.
Across the US
101 community water systems had at least one health-based Fluoride violation since 2016. Routine Fluoride 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 |
|---|---|---|
| Seven Estates Water System | 189 | 104 |
| Stormlight Mobile Home Park Water System | 76 | 83 |
| City of Seagraves | 2,417 | 49 |
| Plott Acres Water System | 204 | 46 |
| City of Smyer | 474 | 42 |
| City of Ropesville | 430 | 42 |
| Cswr Southwest Garden Water | 324 | 42 |
| Borden County Water System | 275 | 42 |
| Valley Estates Water System | 68 | 42 |
| Terrells Mobile Home Park Water System | 60 | 42 |
| San Simon Dwid Water System | 312 | 41 |
| Rescue Waterworks | 203 | 41 |
| Grassland Water Supply Corporation | 55 | 41 |
| 114th Street Mobile Home Park Water System | 42 | 37 |
| Lordsburg Water Supply System | 3,298 | 36 |
| City of Opdyke West | 220 | 36 |
| Country View MHP | 54 | 36 |
| Cox Addition Water System | 114 | 35 |
| Town North Estates Water System | 216 | 29 |
| City of Wellman | 200 | 29 |
| Willing Workers Club Water System | 31 | 29 |
| Ironwood Camp Water System | 45 | 27 |
| San Ysidro Water Supply System | 166 | 24 |
| Deer Run Water System | 104 | 23 |
| City of Plains | 1,355 | 21 |
States with the most systems with violations
- Texas: 38
- California: 14
- Arizona: 9
- New Mexico: 8
- Georgia: 5
- New Hampshire: 5
- Virginia: 4
- Washington: 3
- Alabama: 2
- Idaho: 1
- Wyoming: 1
- Montana: 1
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 Fluoride in drinking water?
The federal legal limit (MCL) is 4 ppm. EPA's health goal (MCLG), the level with no known risk, is 4 ppm.
How do I remove Fluoride from tap water?
See the filter guidance on this page: look for a product certified for Fluoride 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.