Water quality for ZIP code 57278
ZIP 57278 covers Willow Lake and Mayfield Colony in Clark County, South Dakota, one of 6 ZIP codes in the county. 8 active public water systems serve the county; 2 had an EPA violation in the past three years.
Most likely your provider
Your location is within the outer bounds of this system's EPA service area.
Other community water systems in Clark County
7 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Willow Lake Willow Lake |
255 | 0 | 3.4 mi | |
| Collins Colony Aberdeen, Iroquois |
95 | 0 | 11.0 mi | |
| Shamrock Colony Aberdeen, Carpenter |
75 | 2 | 12.6 mi | |
| Clark Clark |
1,148 | 0 | 16.3 mi | |
| Fordham Colony Aberdeen, Carpenter |
142 | 0 | 16.9 mi | |
| Garden City Garden City |
33 | 1 | 22.7 mi | |
| Sioux Rural Water System Goodwin, Watertown |
4,280 | 0 | 28.7 mi |
About this data
Water systems are matched to Clark County, the county this ZIP code lies in, nearest to the ZIP code's centre first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility. Distances are measured to the centre of the service area EPA publishes for the system.
ZIP code areas and town boundaries come from the U.S. Census Bureau's 2020 ZCTA files.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The South Dakota records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.