PURISSIMA HILLS WATER DISTRICT
PWSID: CA4310021 · LOS ALTOS HILLS, CA · Serving 6,245 people
Type: CWSOwner: LSource: SW
Compliant
All PFAS compounds below EPA Maximum Contaminant Levels.
Key contaminants vs MCL
EPA MCL: 4 ppt (parts per trillion) for PFOA and PFOS individually. Compliance deadline: 2031-12-31
Exact contamination levels
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Upgrade to ProDetection summary
N/A ppt
Highest single detection
2025-09-16
Latest sample date
All PFAS detection results
Source: EPA UCMR5 (UCMR5) · 87 compounds tested
| Contaminant | Result (ppt) | MCL (ppt) | Status | Sample date |
|---|
| 11Cl-PF3OUdS | ND | — | Below MRL | 2025-03-10 |
| 9Cl-PF3ONS | ND | — | Below MRL | 2025-03-10 |
| ADONA | ND | — | Below MRL | 2025-03-10 |
| HFPO-DA | ND | 10 | Below MRL | 2025-03-10 |
| PFBA | ND | — | Below MRL | 2025-03-10 |