Water quality in Mason City, Iowa
Mason City is in Cerro Gordo County. 34 active public water systems serve the county; 13 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 Cerro Gordo County
8 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Plymouth Water Supply Plymouth |
378 | 5 | 7.9 mi | |
| Clear Lake Water Department Clear Lake |
7,687 | 0 | 9.6 mi | |
| Long Beach Mobile Park Clear Lake |
50 | 0 | 9.9 mi | |
| Rockwell Water Supply Rockwell |
1,071 | 1 | 11.6 mi | |
| Ventura Water Works Ventura |
717 | 0 | 12.7 mi | |
| Swaledale Water Supply Swaledale |
144 | 0 | 13.1 mi | |
| Thornton Water Supply Thornton |
400 | 1 | 17.0 mi | |
| Meservey Water Supply Meservey |
222 | 0 | 21.3 mi |
Non-community systems in Cerro Gordo County (25: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to Cerro Gordo County, nearest to Mason City 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 or, for systems without one, to the centre of the first town EPA lists the system as serving, from Census Bureau place files.
Town locations and ZIP code areas come from U.S. Census Bureau 2020 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 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.