ZIP Code 93402
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.
14
PFAS Detected
2
Above EPA Limits
2
Water Systems
368%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 368% of limit
Detected: 14.70 ppt
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 293% of limit
Detected: 11.70 ppt
LOS OSOS COMMUNITY SERVICES DISTRICT
CA4010016 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 |
|---|---|---|---|---|
PFOA Perfluorooctanoic acid | 14.70ppt | 368% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOS Perfluorooctane sulfonic acid | 11.70ppt | 293% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 8.40ppt | 84% of limit
| 10 ppt | Below limit |
lithium | 16100.00ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 18.00ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 16.80ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 16.60ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 6.00ppt | No federal limit | — | Unregulated |
Show 1 more compound detected at low levels
| PFHpAPerfluoroheptanoic acid | 5.40 ppt | No federal limit |
GOLDEN STATE WATER COMPANY - LOS OSOS
CA4010017 ModerateWater Type
Groundwater
PFAS Detected
5
Above MCL
0
State
California
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFHxS Perfluorohexane sulfonic acid | 8.80ppt | 88% of limit
| 10 ppt | Below limit |
lithium | 9600.00ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 4.30ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 3.40ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 3.20ppt | No federal limit | — | Unregulated |
Note: ZIP code 93402 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.