PRESIDIO OF SAN FRANCISCO
Moderate7 PFAS compounds detected at measurable levels
All detected PFAS are below the EPA Maximum Contaminant Levels set in April 2024.
7
PFAS Detected
0
Above EPA Limits
1
ZIP Served
Surface
Water Source
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOA Perfluorooctanoic acid | 4.00ppt | 100% of limit
| 4 ppt | Below limit |
PFHxS Perfluorohexane sulfonic acid | 4.60ppt | 46% of limit
| 10 ppt | Below limit |
PFPeA Perfluoropentanoic acid | 8.90ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 6.80ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 6.20ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 4.90ppt | No federal limit | — | Unregulated |
PFHpA Perfluoroheptanoic acid | 3.10ppt | No federal limit | — | Unregulated |
About this data
Source
EPA UCMR 5 — January 2026 release
Sampling period
January 2023 – December 2025
Water system ID (PWSID)
CA3810700
Detection threshold (MRL)
~1.5–2 ppt — "Not detected" means below this floor