PFAS in San Antonio, TX Drinking Water
PFAS data for San Antonio, Texas · 1,860,461 residents · 86 ZIP codes
ZipCheckup's reading of PFAS in San Antonio, Texas: the highest detected level is 0.0092 ppt; the EPA limit is 4 ppt (PFOA/PFOS individually). PFAS carries a high health-risk designation.
PFAS exposure in drinking water is tracked by EPA across the country; households in San Antonio, Texas are among those with confirmed detections in the public water record.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-07-13
PFAS in San Antonio Tap Water
PFAS has been detected in San Antonio, Texas drinking water at a maximum level of 0.0092 detections — relative to the EPA MCL of 4 ppt (PFOA/PFOS individually).
This analysis covers 1,860,461 residents across 86 ZIP codes in San Antonio.
San Antonio's overall water quality grade is A (92/100).
Is PFAS in San Antonio Water Safe?
PFAS was detected in San Antonio 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 granular activated carbon filter can reduce pfas levels further.
PFAS Levels by ZIP Code
| ZIP Code | PFAS Level | EPA Limit | Status |
|---|---|---|---|
| 78266 | 10 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 78213 | 8 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 78216 | 8 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 78238 | 7 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 78240 | 7 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 78201 | 6 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 78202 | 6 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 78203 | 6 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 78204 | 6 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 78205 | 6 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 78207 | 6 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 78208 | 6 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 78209 | 6 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 78210 | 6 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 78211 | 6 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 78212 | 6 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 78214 | 6 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 78215 | 6 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 78217 | 6 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 78218 | 6 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 78219 | 6 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 78220 | 6 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 78221 | 6 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 78222 | 6 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| 78223 | 6 detections | 4 ppt (PFOA/PFOS individually) | Not comparable |
| ...36 more ZIP codes |
Average pfas level across San Antonio: 6.16 ppt
Health Effects of PFAS
- Increased risk of kidney and testicular cancer
- Thyroid disease and immune system suppression
- Reproductive problems and reduced fertility
- Elevated cholesterol and liver effects
- Developmental effects in infants and children
Health risk severity: High. Governed by the PFAS National Primary Drinking Water Regulation (2024).
How PFAS Gets Into Drinking Water
- Firefighting foam (AFFF) used at military bases and airports
- Industrial manufacturing (non-stick coatings, stain-resistant fabrics)
- Wastewater treatment plants that receive industrial discharge
- Landfill leachate from PFAS-containing consumer products
What to Do About PFAS in San Antonio Water
- Install a reverse osmosis system (most effective — removes 90%+ of PFAS)
- Granular activated carbon (GAC) filters remove some PFAS compounds
- Look for NSF 53 or NSF 58 certification specifically tested for PFAS
- Pitcher filters with activated carbon provide partial reduction
Look for filters certified under NSF 53 / NSF 58 for pfas removal.