ATASCADERO STATE HOSPITAL
High Risk2 PFAS compound(s) exceed EPA Maximum Contaminant Levels
This utility has until 2029 to install treatment under the EPA's April 2024 PFAS rule. In the meantime, a point-of-use filter certified NSF/ANSI 58 for PFOA/PFOS provides reliable interim protection.
5
PFAS Detected
2
Above EPA Limits
1
ZIP Served
Groundwater
Water Source
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 33.00ppt | 825% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 34.00ppt | 340% of limit
| 10 ppt | ⚠ Exceeds MCL |
PFPeS | 6.10ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 5.50ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 3.60ppt | No federal limit | — | Unregulated |
About this data
Source
EPA UCMR 5 — January 2026 release
Sampling period
January 2023 – December 2025
Water system ID (PWSID)
CA4010832
Detection threshold (MRL)
~1.5–2 ppt — "Not detected" means below this floor