ZIP Code 90241
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.
12
PFAS Detected
2
Above EPA Limits
2
Water Systems
1100%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 1100% of limit
Detected: 44.00 ppt
PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 375% of limit
Detected: 15.00 ppt
DOWNEY - CITY, WATER DEPT.
CA1910034 High RiskWater Type
Groundwater
PFAS Detected
8
Above MCL
2
State
California
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 44.00ppt | 1100% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 15.00ppt | 375% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 8.90ppt | 89% of limit
| 10 ppt | Below limit |
PFPeA Perfluoropentanoic acid | 27.00ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 21.00ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 10.00ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 8.90ppt | No federal limit | — | Unregulated |
PFHpA Perfluoroheptanoic acid | 4.20ppt | No federal limit | — | Unregulated |
GSWC - NORWALK
CA1910098 Low LevelWater Type
Groundwater
PFAS Detected
4
Above MCL
0
State
California
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 58000.00ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 15.00ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 13.00ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 7.30ppt | No federal limit | — | Unregulated |
Note: ZIP code 90241 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.