Tap water in Williamstown, MO — ZIP 63077

2 public water systems serving about 12,700 people. PFAS "forever chemicals" have been detected here.

Good

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 63077

Clark County Cons Pwsd 1

PWSID MO2024138 · serves 8,000 · groundwater

0 health-based / 2 total violations (5 yrs)

St Clair Pws

PWSID MO6010708 · serves 4,700 · groundwater

0 health-based / 1 total violations (5 yrs) · PFAS up to 5.6 ppt

Grades summarize EPA SDWIS violation records (last 5 years) and UCMR 5 PFAS results. They are informational, not a health determination. Methodology