Iowa
Lyon County drinking water quality
12 active public water systems serve 12,196 people in Lyon County. 10 are compliant, 2 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
12 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Rock Rapids Municipal Water Works Rock Rapids |
2,611 | 0 | 0 | |
|
Lyon-Sioux Rws-Doon Doon |
1,765 | 0 | 0 | |
|
Lyon-Sioux Rws-Big Sioux Rock Rapids |
1,530 | 0 | 0 | |
|
Lyon-Sioux Rws-Rock Rapids Rock Rapids |
1,187 | 0 | 0 | |
|
George Water Supply George |
1,082 | 0 | 0 | |
|
Inwood Water Supply Inwood |
928 | 0 | 0 | |
|
Larchwood Water Supply Larchwood |
926 | 1 | 0 | |
|
Doon Water Supply Doon |
619 | 0 | 0 | |
|
Lyon-Sioux Rws-Boyden Rock Rapids |
605 | 1 | 0 | |
|
Little Rock Water Supply Little Rock |
441 | 0 | 0 | |
|
Lester Water Supply Lester |
296 | 0 | 0 | |
|
Alvord Municipal Water Supply Alvord |
206 | 0 | 0 |
Inactive systems (12, 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 Iowa 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.