Tap water in Willow Lake, SD — ZIP 57278
2 public water systems serving about 4,535 people.
A
Excellent
Water systems serving 57278
Sioux Rural Water System
PWSID SD4600866 · serves 4,280 ·
groundwater
0 health-based / 3 total violations (5 yrs)
Willow Lake
PWSID SD4600370 · serves 255 ·
groundwater
0 health-based / 0 total violations (5 yrs)
Grades summarize EPA SDWIS violation records (last 5 years) and UCMR 5 PFAS results. They are informational, not a health determination. Methodology