CALIFORNIA WATER SERVICE - STOCKTON

PWSID: CA3910001 · SAN JOSE, CA · Serving 176,266 people

Type: CWSOwner: PSource: SW

Settlement eligible

May qualify for 3M/DuPont settlement funds

Exceeds MCL

One or more PFAS compounds exceed EPA Maximum Contaminant Levels. Corrective action required by 2031.

PFOS5.2 ppt(MCL: 4 ppt)

EPA MCL: 4 ppt (parts per trillion) for PFOA and PFOS individually. Compliance deadline: 2031-12-31

Exact contamination levels

Upgrade to Pro to see PFOA/PFOS ppt values and MCL comparison charts.

PFAS compounds detected

5.2 ppt

Highest single detection

Highest detection

Pro feature

2025-09-09

Latest sample date

partial

Data completeness

All PFAS detection results

Source: EPA UCMR5 (UCMR5) · 1000 compounds tested

Contaminant	Result (ppt)	MCL (ppt)	Status	Sample date
PFBS	ND	—	Below MRL	2025-07-15
PFMBA	ND	—	Below MRL	2025-08-07

998 more results hidden