ZIP Code 91901
Low Level4
PFAS Detected
0
Above EPA Limits
2
Water Systems
N/A
Highest % of MCL
Viejas Community System
090600158 Low LevelWater Type
Groundwater
PFAS Detected
2
Above MCL
0
State
09
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 21400.00ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 24.30ppt | No federal limit | — | Unregulated |
PADRE DAM MWD
CA3710037 Low LevelWater Type
Surface Water
PFAS Detected
2
Above MCL
0
State
California
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 47000.00ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 5.80ppt | No federal limit | — | Unregulated |
Note: ZIP code 91901 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.