Fluoride in Williston, ND Drinking Water
Fluoride data for Williston, North Dakota · 33,969 residents · 3 ZIP codes
EPA records show Fluoride detections in Williston, North Dakota water samples.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-04-05
Fluoride in Williston Tap Water
Fluoride has been detected in Williston, North Dakota drinking water at a maximum level of 44.72 ppb — below the EPA MCL of 4.0 mg/L (MCL) / 2.0 mg/L (SMCL).
This analysis covers 33,969 residents across 3 ZIP codes in Williston.
Williston's overall water quality grade is C (63/100).
Is Fluoride in Williston Water Safe?
If you live in an affected ZIP code, consider installing a reverse osmosis or activated alumina filter certified under NSF 58 and testing your water independently.
Fluoride Levels by ZIP Code
| ZIP Code | Fluoride Level | EPA Limit | Status |
|---|---|---|---|
| 58801 | 44.72 ppm | 4.0 mg/L (MCL) / 2.0 mg/L (SMCL) | OK |
| 58802 | 44.72 ppm | 4.0 mg/L (MCL) / 2.0 mg/L (SMCL) | OK |
| 58803 | 44.72 ppm | 4.0 mg/L (MCL) / 2.0 mg/L (SMCL) | OK |
Average fluoride level across Williston: 44.72 ppb
Health Effects of Fluoride
- Skeletal fluorosis at levels above 4 mg/L (bone pain, joint stiffness)
- Dental fluorosis in children at levels above 2 mg/L
- At 0.7 mg/L (water fluoridation level), helps prevent tooth decay
- Possible thyroid effects at high chronic exposure
Health risk severity: Moderate. Governed by the National Primary Drinking Water Regulations.
How Fluoride Gets Into Drinking Water
- Intentional water fluoridation (0.7 mg/L target, beneficial)
- Natural deposits in certain rock formations
- Industrial discharge (aluminum, fertilizer production)
- Naturally elevated in some groundwater (especially arid regions)
What to Do About Fluoride in Williston Water
- Reverse osmosis removes 90%+ of fluoride
- Activated alumina filters are effective for fluoride
- Bone char carbon can reduce fluoride
- Standard activated carbon filters do NOT remove fluoride
Look for filters certified under NSF 58 for fluoride removal.