We analyzed tap water quality data for hundreds of cities across the United States to identify those with the highest levels of fluoride. This ranking is based on 2026 data from the EPA and EWG databases.
Fluoride is a contaminant of growing concern in drinking water. The cities below have the highest detected levels based on the most recent testing data available.
Rankings at a Glance
Morrisonville, Illinois
Morrisonville has fluoride detected at 6.79 ppm. 15 total contaminants were found in the water supply.
Chilili, New Mexico
Chilili has fluoride detected at 6.50 ppm. 11 total contaminants were found in the water supply.
Lovington, Texas
Lovington has fluoride detected at 5.90 ppm. 7 total contaminants were found in the water supply.
San Simon, Arizona
San Simon has fluoride detected at 5.62 ppm. 7 total contaminants were found in the water supply.
Lordsburg, New Mexico
Lordsburg has fluoride detected at 5.53 ppm. 10 total contaminants were found in the water supply.
Brooklyn, Michigan
Brooklyn has fluoride detected at 5.49 ppm. 6 total contaminants were found in the water supply.
Richey, Montana
Richey has fluoride detected at 5.40 ppm. 9 total contaminants were found in the water supply.
Gail, Texas
Gail has fluoride detected at 5.32 ppm. 11 total contaminants were found in the water supply.
Lakemont, Georgia
Lakemont has fluoride detected at 5.07 ppm. 6 total contaminants were found in the water supply.
Wolfforth, Texas
Wolfforth has fluoride detected at 4.96 ppm. 17 total contaminants were found in the water supply.
Smyer, Texas
Smyer has fluoride detected at 4.95 ppm. 13 total contaminants were found in the water supply.
Rescue, Virginia
Rescue has fluoride detected at 4.88 ppm. 3 total contaminants were found in the water supply.
Ropesville, Texas
Ropesville has fluoride detected at 4.83 ppm. 13 total contaminants were found in the water supply.
Wellman, Texas
Wellman has fluoride detected at 4.68 ppm. 13 total contaminants were found in the water supply.
Seagraves, Texas
Seagraves has fluoride detected at 4.68 ppm. 12 total contaminants were found in the water supply.
Carrollton, Virginia
Carrollton has fluoride detected at 4.41 ppm. 1 total contaminants were found in the water supply.
Newberry Springs, California
Newberry Springs has fluoride detected at 4.19 ppm. 15 total contaminants were found in the water supply.
Circle, Montana
Circle has fluoride detected at 4.17 ppm. 8 total contaminants were found in the water supply.
Courtland, Virginia
Courtland has fluoride detected at 4.13 ppm. 2 total contaminants were found in the water supply.
New Home, Texas
New Home has fluoride detected at 4.12 ppm. 11 total contaminants were found in the water supply.
Bismarck, Montana
Bismarck has fluoride detected at 4.10 ppm. 4 total contaminants were found in the water supply.
Plains, Texas
Plains has fluoride detected at 4.04 ppm. 12 total contaminants were found in the water supply.
Umbarger, Texas
Umbarger has fluoride detected at 4 ppm. 11 total contaminants were found in the water supply.
Blue Jacket, Oklahoma
Blue Jacket has fluoride detected at 3.92 ppm. 7 total contaminants were found in the water supply.
Ironton, Missouri
Ironton has fluoride detected at 3.81 ppm. 9 total contaminants were found in the water supply.
What We Found: Key Patterns
The most frequently detected contaminants exceeding health guidelines across these cities are Fluoride, Total trihalomethanes (TTHMs), Bromoform. These appear repeatedly across different water systems and regions.
Geographically, the states most represented in this ranking are Texas (10), Montana (3), Virginia (3). Regional water sources, industrial activity, and agricultural runoff all contribute to local water quality variation.
Across all ranked cities, 182 contaminant readings exceed EWG health guidelines, but only 29 exceed EPA legal limits. This gap of 153 highlights how legal standards may not fully protect public health — EPA limits haven't been updated for many contaminants in decades.
Full Rankings Table
| Rank | City | State | Detected | Above Guidelines | Above Legal | People Served |
|---|---|---|---|---|---|---|
| 1 | Morrisonville | IL | 15 | 14 | 1 | 1,068 |
| 2 | Chilili | NM | 11 | 9 | 1 | 170 |
| 3 | Lovington | TX | 7 | 6 | 2 | 60 |
| 4 | San Simon | AZ | 7 | 5 | 1 | 300 |
| 5 | Lordsburg | NM | 10 | 8 | 1 | 3,213 |
| 6 | Brooklyn | MI | 6 | 4 | 1 | 1,313 |
| 7 | Richey | MT | 9 | 5 | 1 | 0 |
| 8 | Gail | TX | 11 | 9 | 1 | 275 |
| 9 | Lakemont | GA | 6 | 6 | 1 | 88 |
| 10 | Wolfforth | TX | 17 | 13 | 1 | 278 |
| 11 | Smyer | TX | 13 | 9 | 2 | 474 |
| 12 | Rescue | VA | 3 | 2 | 1 | 203 |
| 13 | Ropesville | TX | 13 | 10 | 1 | 0 |
| 14 | Wellman | TX | 13 | 10 | 2 | 200 |
| 15 | Seagraves | TX | 12 | 9 | 2 | 0 |
| 16 | Carrollton | VA | 1 | 1 | 1 | 31 |
| 17 | Newberry Springs | CA | 15 | 12 | 2 | 40 |
| 18 | Circle | MT | 8 | 7 | 1 | 644 |
| 19 | Courtland | VA | 2 | 2 | 1 | 1,284 |
| 20 | New Home | TX | 11 | 9 | 2 | 326 |
| 21 | Bismarck | MT | 4 | 3 | 1 | 30 |
| 22 | Plains | TX | 12 | 9 | 2 | 0 |
| 23 | Umbarger | TX | 11 | 9 | 0 | 120 |
| 24 | Blue Jacket | OK | 7 | 5 | 0 | 274 |
| 25 | Ironton | MO | 9 | 6 | 0 | 207 |
Frequently Asked Questions
What cities have the highest levels of fluoride?
Our analysis of 2026 data identified the cities with the highest detected levels of fluoride. See the full ranking above.
Is fluoride dangerous in drinking water?
Fluoride has known health risks at elevated levels. The EWG sets health guidelines that are often stricter than EPA legal limits to account for the latest research on long-term exposure.
How do I remove fluoride from my water?
Reverse osmosis (RO) systems are the most effective at removing a wide range of contaminants. Check the specific contaminant details for recommended filtration technology.
What is the EPA legal limit for fluoride?
EPA legal limits vary by contaminant and may differ from EWG health guidelines. See individual city reports for specific legal limit comparisons.
Related Reports
Data sources: Environmental Working Group (EWG) Tap Water Database, U.S. EPA Safe Drinking Water Information System (SDWIS)
Last updated: September 2026
Methodology: Contaminant levels are compared against both EPA legal limits (Maximum Contaminant Levels) and EWG health guidelines, which are often stricter and based on the latest scientific research.
