ZIP Code 90640
High RiskPFAS above EPA limits detected
5 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.
24
PFAS Detected
5
Above EPA Limits
5
Water Systems
1325%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 215% of limit
Detected: 8.60 ppt
PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 400% of limit
Detected: 16.00 ppt
CALIFORNIA WATER SERVICE CO. - ELA
CA1910036 High RiskWater Type
Groundwater
PFAS Detected
6
Above MCL
1
State
California
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 8.60ppt | 215% of limit
| 4 ppt | ⚠ Exceeds MCL |
lithium | 47100.00ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 12.90ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 8.00ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 7.60ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 4.90ppt | No federal limit | — | Unregulated |
SAN GABRIEL VALLEY WATER CO.-EL MONTE
CA1910039 Low LevelWater Type
Groundwater
PFAS Detected
2
Above MCL
0
State
California
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFBA Perfluorobutanoic acid | 10.00ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 5.60ppt | No federal limit | — | Unregulated |
MONTEBELLO LAND & WATER CO.
CA1910091 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 | 53.00ppt | 1325% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 16.00ppt | 400% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 8.60ppt | 86% of limit
| 10 ppt | Below limit |
PFBA Perfluorobutanoic acid | 14.00ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 11.00ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 9.20ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 9.10ppt | No federal limit | — | Unregulated |
PFHpA Perfluoroheptanoic acid | 4.90ppt | No federal limit | — | Unregulated |
MONTEBELLO-CITY, WATER DEPT.
CA1910117 Low LevelWater Type
Surface Water
PFAS Detected
1
Above MCL
0
State
California
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 54000.00ppt | No federal limit | — | Unregulated |
SOUTH MONTEBELLO IRRIGATION DIST.
CA1910153 High RiskWater Type
Groundwater
PFAS Detected
7
Above MCL
2
State
California
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 20.10ppt | 503% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 8.20ppt | 205% of limit
| 4 ppt | ⚠ Exceeds MCL |
lithium | 18500.00ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 6.70ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 6.60ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 4.90ppt | No federal limit | — | Unregulated |
PFDA Perfluorodecanoic acid | 3.70ppt | No federal limit | — | Unregulated |
Note: ZIP code 90640 is served by 5 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.