ZIP Code 91321
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.
11
PFAS Detected
2
Above EPA Limits
2
Water Systems
513%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 513% of limit
Detected: 20.50 ppt
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 445% of limit
Detected: 17.80 ppt
SANTA CLARITA VALLEY W.A.-SANTA CLARITA
CA1910017 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 | 20.50ppt | 513% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOS Perfluorooctane sulfonic acid | 17.80ppt | 445% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 4.70ppt | 47% of limit
| 10 ppt | Below limit |
lithium | 42900.00ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 18.40ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 16.10ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 12.90ppt | No federal limit | — | Unregulated |
PFHpA Perfluoroheptanoic acid | 10.00ppt | No federal limit | — | Unregulated |
Show 1 more compound detected at low levels
| PFBSPerfluorobutane sulfonic acid | 7.10 ppt | No federal limit |
SANTA CLARITA VALLEY W.A.-NEWHALL DIV.
CA1910096 Low LevelWater Type
MX
PFAS Detected
2
Above MCL
0
State
California
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFHxS Perfluorohexane sulfonic acid | 7.80ppt | 78% of limit
| 10 ppt | Below limit |
lithium | 13600.00ppt | No federal limit | — | Unregulated |
Note: ZIP code 91321 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.