Water quality for ZIP code 57042
ZIP 57042 covers Madison, Rustic Acres Colony, and Lake Madison in Lake County, South Dakota, one of 7 ZIP codes in the county. 6 active public water systems serve the county; 0 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 Lake County
5 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Madison Madison |
6,191 | 0 | 2.6 mi | |
| Wentworth Egan, Wentworth |
181 | 0 | 9.5 mi | |
| Ramona Arlington, Ramona |
159 | 0 | 9.6 mi | |
| Chester Sanitary District Chester, Egan |
363 | 0 | 13.0 mi | |
| Big Sioux Community Water System Egan |
5,800 | 0 | 22.0 mi |
About this data
Water systems are matched to Lake 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. Retrieved from ECHO on Oct 11, 2026.