South Dakota
McCook County drinking water quality
9 active public water systems serve 36,806 people in McCook County. 8 are compliant, 1 had at least one EPA violation in the past three years, 0 are designated serious violators, and 0 carry a health flag.
Community water systems
9 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Minnehaha Community Water Corp Dell Rapids |
13,435 | 0 | 0 | |
|
BY Water District Avon, Tabor |
13,320 | 0 | 0 | |
|
TM Rural Water District Parker, Sioux Falls |
4,250 | 0 | 0 | |
|
Hanson Rural Water System Emery, Fulton |
2,685 | 0 | 0 | |
|
Salem Salem |
1,325 | 0 | 0 | |
|
Canistota Canistota |
642 | 1 | 0 | |
|
Bridgewater Bridgewater |
511 | 0 | 0 | |
|
Montrose Montrose |
468 | 0 | 0 | |
|
Spencer Spencer |
170 | 0 | 0 |
Inactive systems (6, no longer operating or reporting)
Kept for the record and excluded from the county totals above. Browse inactive systems.
About this data
Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.
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.