ZIP Code 92831
High RiskPFAS above EPA limits detected
2 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
2
Above EPA Limits
1
Water System
333%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 333% of limit
Detected: 13.30 ppt
PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 270% of limit
Detected: 10.80 ppt
CITY OF FULLERTON
CA3010010 High RiskWater Type
Groundwater
PFAS Detected
9
Above MCL
2
State
California
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 13.30ppt | 333% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 10.80ppt | 270% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 6.20ppt | 62% of limit
| 10 ppt | Below limit |
lithium | 34983.40ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 13.20ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 12.40ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 7.60ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 5.90ppt | No federal limit | — | Unregulated |
Show 1 more compound detected at low levels
| PFHpAPerfluoroheptanoic acid | 4.80 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.