Fluoride in Largo, FL Drinking Water
Fluoride data for Largo, Florida · 105,903 residents · 6 ZIP codes
EPA records show Fluoride detections in Largo, Florida water samples.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-04-05
Fluoride in Largo Tap Water
Fluoride has been detected in Largo, Florida drinking water at a maximum level of 0.66 ppb — below the EPA MCL of 4.0 mg/L (MCL) / 2.0 mg/L (SMCL).
This analysis covers 105,903 residents across 6 ZIP codes in Largo.
Largo's overall water quality grade is B (72/100).
Is Fluoride in Largo 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 |
|---|---|---|---|
| 33770 | 0.66 ppm | 4.0 mg/L (MCL) / 2.0 mg/L (SMCL) | OK |
| 33771 | 0.66 ppm | 4.0 mg/L (MCL) / 2.0 mg/L (SMCL) | OK |
| 33773 | 0.66 ppm | 4.0 mg/L (MCL) / 2.0 mg/L (SMCL) | OK |
| 33774 | 0.66 ppm | 4.0 mg/L (MCL) / 2.0 mg/L (SMCL) | OK |
| 33778 | 0.66 ppm | 4.0 mg/L (MCL) / 2.0 mg/L (SMCL) | OK |
| 33779 | 0.66 ppm | 4.0 mg/L (MCL) / 2.0 mg/L (SMCL) | OK |
Average fluoride level across Largo: 0.66 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 Largo 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.