ZIP Code 90270
High RiskPFAS above EPA limits detected
4 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
4
Above EPA Limits
3
Water Systems
660%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 283% of limit
Detected: 11.30 ppt
PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 183% of limit
Detected: 7.30 ppt
MAYWOOD MUTUAL WATER CO. #1
CA1910084 High RiskWater Type
Groundwater
PFAS Detected
2
Above MCL
1
State
California
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 11.30ppt | 283% of limit
| 4 ppt | ⚠ Exceeds MCL |
lithium | 12600.00ppt | No federal limit | — | Unregulated |
MAYWOOD MUTUAL WATER CO. #2
CA1910085 High RiskWater Type
Groundwater
PFAS Detected
2
Above MCL
1
State
California
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 4.30ppt | 108% of limit
| 4 ppt | ⚠ Exceeds MCL |
lithium | 14800.00ppt | No federal limit | — | Unregulated |
MAYWOOD MUTUAL WATER CO. #3
CA1910086 High RiskWater Type
Groundwater
PFAS Detected
4
Above MCL
2
State
California
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 26.40ppt | 660% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 7.30ppt | 183% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 6.10ppt | 61% of limit
| 10 ppt | Below limit |
lithium | 21800.00ppt | No federal limit | — | Unregulated |
Note: ZIP code 90270 is served by 3 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.