Tap water in Stockton, CA — ZIP 95231
2 public water systems serving about 375,477 people. PFAS "forever chemicals" have been detected here.
F
Failing
PFAS detected: at least one system serving this ZIP reported PFAS in EPA UCMR 5
testing. Levels and the 2024 federal limits are shown per system below.
Water systems serving 95231
City Of Stockton
PWSID CA3910012 · serves 192,702 ·
surface water
2 health-based / 3 total violations (5 yrs)
· PFAS up to 28 ppt — above federal limit
California Water Service - Stockton
PWSID CA3910001 · serves 182,775 ·
surface water
0 health-based / 0 total violations (5 yrs)
· PFAS up to 5.2 ppt — above federal limit
Grades summarize EPA SDWIS violation records (last 5 years) and UCMR 5 PFAS results. They are informational, not a health determination. Methodology