ZIP Code 92509
Low Level7
PFAS Detected
0
Above EPA Limits
2
Water Systems
34%
Highest % of MCL
RUBIDOUX COMMUNITY SD
CA3310044 Low LevelWater Type
Groundwater
PFAS Detected
3
Above MCL
0
State
California
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFPeA Perfluoropentanoic acid | 28.00ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 22.00ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 8.20ppt | No federal limit | — | Unregulated |
WESTERN MWD
CA3310049 Low LevelWater Type
MX
PFAS Detected
4
Above MCL
0
State
California
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFHxS Perfluorohexane sulfonic acid | 3.40ppt | 34% of limit
| 10 ppt | Below limit |
lithium | 16000.00ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 4.70ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 3.00ppt | No federal limit | — | Unregulated |
Note: ZIP code 92509 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.