ZIP Code 95301
High RiskPFAS above EPA limits detected
3 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.
10
PFAS Detected
3
Above EPA Limits
1
Water System
1125%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 1125% of limit
Detected: 45.00 ppt
PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 825% of limit
Detected: 33.00 ppt
PFHxS Exceeds EPA limit
0 ppt MCL: 10 ppt 590% of limit
Detected: 59.00 ppt
CITY OF ATWATER
CA2410001 High RiskWater Type
Groundwater
PFAS Detected
10
Above MCL
3
State
California
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 45.00ppt | 1125% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 33.00ppt | 825% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 59.00ppt | 590% of limit
| 10 ppt | ⚠ Exceeds MCL |
PFPeA Perfluoropentanoic acid | 27.00ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 25.00ppt | No federal limit | — | Unregulated |
6:2 FTS 6:2 Fluorotelomer sulfonic acid | 13.00ppt | No federal limit | — | Unregulated |
PFHpA Perfluoroheptanoic acid | 12.00ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 11.00ppt | No federal limit | — | Unregulated |
Show 2 more compounds detected at low levels
| PFPeS | 8.20 ppt | No federal limit |
| PFBSPerfluorobutane sulfonic acid | 7.80 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.