Fluoride in Texas well water
In Texas, 4% of 20,190 tested private well samples exceeded the EPA limit for fluoride (4 mg/L).
Natural fluoride in bedrock wells can exceed the limit. Above 4 mg/L long-term exposure causes skeletal fluorosis; above 2 mg/L children can develop tooth mottling.
Check your fluoride number
Type the value from your lab report. It is compared to the EPA limit, the same way the full interpretation does it.
Getting it fixed
Book a free in-home water test with a licensed local company, or see the treatment guide for what removes fluoride.
By county, from individual samples
Public monitoring samples against the EPA limit (4 mg/L); counties with at least 30 samples.
| County | Samples | Detected | Above EPA limit | Median | Highest |
|---|---|---|---|---|---|
| Lynn | 43 | 100% | 70% | 4.93 | 9.33 mg/L |
| Terry | 42 | 100% | 69% | 4.64 | 7.72 mg/L |
| Dawson | 104 | 100% | 67% | 4.57 | 6.78 mg/L |
| Gaines | 78 | 100% | 53% | 4.25 | 6.13 mg/L |
| Martin | 82 | 100% | 41% | 3.28 | 10.1 mg/L |
| Yoakum | 70 | 100% | 41% | 3.75 | 6.76 mg/L |
| Lubbock | 83 | 100% | 41% | 3.3 | 6.1 mg/L |
| Briscoe | 32 | 100% | 41% | 3.67 | 4.92 mg/L |
| Hockley | 34 | 100% | 38% | 3.79 | 6 mg/L |
| Howard | 91 | 100% | 30% | 2.5 | 15.3 mg/L |
| Hopkins | 39 | 72% | 28% | 0.2 | 5.7 mg/L |
| Bell | 64 | 100% | 28% | 1.68 | 6.1 mg/L |
| Williamson | 296 | 99% | 25% | 2.9 | 7.6 mg/L |
| Andrews | 50 | 98% | 24% | 2.44 | 5.07 mg/L |
| Presidio | 61 | 98% | 23% | 2.02 | 9.55 mg/L |
- Brownfield CCD, Terry County82% of 34
- Seminole CCD, Gaines County50% of 62
- Taylor CCD, Williamson County48% of 31
- Tarzan-Lenorah CCD, Martin County47% of 68
- Big Spring North CCD, Howard County46% of 59
- Plains CCD, Yoakum County39% of 54
- Lubbock CCD, Lubbock County38% of 47
- Jarrell CCD, Williamson County37% of 59
- Andrews North CCD, Andrews County32% of 37
- Marfa CCD, Presidio County28% of 47
- South Bell CCD, Bell County24% of 59
- San Marcos CCD, Hays County21% of 42
- Northwest Travis CCD, Travis County21% of 99
- Florence CCD, Williamson County20% of 50
- Dalhart CCD, Dallam County17% of 35
- Cedar Park-Liberty Hill CCD, Williamson County17% of 60
- Bandera CCD, Bandera County16% of 74
- Round Rock-Georgetown CCD, Williamson County16% of 90
- Westbrook CCD, Mitchell County14% of 35
- Southwest Travis CCD, Travis County13% of 165
Sources
- Individual samples from the USGS Water Quality Portal and state monitoring, summarized per geography. fluoride counts and shares are listed on each county and town page with their sources.