Fluoride in Daly City, CA Drinking Water
Fluoride data for Daly City, California · 110,390 residents · 4 ZIP codes
Across the water systems that serve Daly City, California, Fluoride has appeared in EPA compliance samples — standard municipal treatment targets this contaminant, though detections in the compliance record indicate it has reached household taps at measurable levels.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-04-05
Fluoride in Daly City Tap Water
Fluoride has been detected in Daly City, California drinking water at a maximum level of 2.6 ppb — below the EPA MCL of 4.0 mg/L (MCL) / 2.0 mg/L (SMCL).
This analysis covers 110,390 residents across 4 ZIP codes in Daly City.
Daly City's overall water quality grade is B (75/100).
Is Fluoride in Daly City Water Safe?
Fluoride was detected in Daly City water but currently falls within EPA limits. However, some health organizations argue the EPA MCL may not be protective enough.
If you are concerned, a reverse osmosis or activated alumina filter can reduce fluoride levels further.
Fluoride Levels by ZIP Code
| ZIP Code | Fluoride Level | EPA Limit | Status |
|---|---|---|---|
| 94014 | 2.6 ppm | 4.0 mg/L (MCL) / 2.0 mg/L (SMCL) | OK |
| 94015 | 2.6 ppm | 4.0 mg/L (MCL) / 2.0 mg/L (SMCL) | OK |
| 94016 | 2.6 ppm | 4.0 mg/L (MCL) / 2.0 mg/L (SMCL) | OK |
| 94017 | 2.6 ppm | 4.0 mg/L (MCL) / 2.0 mg/L (SMCL) | OK |
Average fluoride level across Daly City: 2.6 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 Daly City 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.