ZIP Code 91963
High RiskPFAS above EPA limits detected
4 compounds exceed EPA Maximum Contaminant Levels in water serving this ZIP code. Standard pitcher filters like Brita do not remove PFAS. See filter recommendations below.
9
PFAS Detected
4
Above EPA Limits
1
Water System
4708%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 4708% of limit
Detected: 188.30 ppt
PFHxS Exceeds EPA limit
0 ppt MCL: 10 ppt 2502% of limit
Detected: 250.20 ppt
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 1605% of limit
Detected: 64.20 ppt
PFNA Exceeds EPA limit
0 ppt MCL: 10 ppt 102% of limit
Detected: 10.20 ppt
POTRERO ELEMENTARY SCHOOL
CA3700963 High RiskWater Type
Groundwater
PFAS Detected
9
Above MCL
4
State
California
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOA Perfluorooctanoic acid | 188.30ppt | 4708% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 250.20ppt | 2502% of limit
| 10 ppt | ⚠ Exceeds MCL |
PFOS Perfluorooctane sulfonic acid | 64.20ppt | 1605% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFNA Perfluorononanoic acid | 10.20ppt | 102% of limit
| 10 ppt | ⚠ Exceeds MCL |
PFHxA Perfluorohexanoic acid | 95.20ppt | No federal limit | — | Unregulated |
PFHpA Perfluoroheptanoic acid | 72.70ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 62.00ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 13.10ppt | No federal limit | — | Unregulated |
Show 1 more compound detected at low levels
| PFBSPerfluorobutane sulfonic acid | 5.90 ppt | No federal limit |
Data source: EPA Unregulated Contaminant Monitoring Rule, 5th cycle (UCMR 5) — January 2026 release.
UCMR 5 tested ~10,000 public water systems serving more than 25 people between 2023-2025 for 29 PFAS compounds.
Detection values represent the highest single-sample result measured at entry points to the distribution system.