ZIP Code 92861
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.
11
PFAS Detected
3
Above EPA Limits
2
Water Systems
425%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 425% of limit
Detected: 17.00 ppt
PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 233% of limit
Detected: 9.30 ppt
PFHxS Exceeds EPA limit
0 ppt MCL: 10 ppt 102% of limit
Detected: 10.20 ppt
CITY OF ORANGE
CA3010027 High RiskWater Type
Groundwater
PFAS Detected
8
Above MCL
3
State
California
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 17.00ppt | 425% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 9.30ppt | 233% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 10.20ppt | 102% of limit
| 10 ppt | ⚠ Exceeds MCL |
lithium | 35277.40ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 17.70ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 12.60ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 10.10ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 3.30ppt | No federal limit | — | Unregulated |
SERRANO WATER DISTRICT
CA3010082 Low LevelWater Type
Groundwater
PFAS Detected
3
Above MCL
0
State
California
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 27100.00ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 16.10ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 11.10ppt | No federal limit | — | Unregulated |
Note: ZIP code 92861 is served by 2 separate water utilities.
Results above show data for each system independently.
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.