ZIP Code 92317
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.
8
PFAS Detected
2
Above EPA Limits
1
Water System
350%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 350% of limit
Detected: 14.00 ppt
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 180% of limit
Detected: 7.20 ppt
LAKE ARROWHEAD CSD
CA3610005 High RiskWater Type
Surface Water
PFAS Detected
8
Above MCL
2
State
California
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOA Perfluorooctanoic acid | 14.00ppt | 350% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOS Perfluorooctane sulfonic acid | 7.20ppt | 180% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFNA Perfluorononanoic acid | 4.60ppt | 46% of limit
| 10 ppt | Below limit |
PFHxS Perfluorohexane sulfonic acid | 3.30ppt | 33% of limit
| 10 ppt | Below limit |
PFHxA Perfluorohexanoic acid | 6.70ppt | No federal limit | — | Unregulated |
PFHpA Perfluoroheptanoic acid | 5.70ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 4.50ppt | No federal limit | — | Unregulated |
PFDA Perfluorodecanoic acid | 3.90ppt | No federal limit | — | Unregulated |
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.