Fluoride in Altadena, CA Drinking Water
Fluoride data for Altadena, California · 30,150 residents · 2 ZIP codes
Fluoride is regulated under the Safe Drinking Water Act because of its potential health effects at elevated concentrations; for residents of Altadena, California, the relevant fact is that it has shown up in recent EPA compliance samples — point-of-use filtration is one option residents research, alongside reviewing the utility's published treatment data.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-05-14
Fluoride in Altadena Tap Water
Fluoride has been detected in Altadena, California drinking water at a maximum level of 1.4 ppb — below the EPA MCL of 4.0 mg/L (MCL) / 2.0 mg/L (SMCL).
This analysis covers 30,150 residents across 2 ZIP codes in Altadena.
Altadena's overall water quality grade is B (71/100).
Is Fluoride in Altadena Water Safe?
Fluoride was detected in Altadena 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 |
|---|---|---|---|
| 91001 | 1.4 ppm | 4.0 mg/L (MCL) / 2.0 mg/L (SMCL) | OK |
| 91003 | 1.4 ppm | 4.0 mg/L (MCL) / 2.0 mg/L (SMCL) | OK |
Average fluoride level across Altadena: 1.4 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 Altadena 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.