Water quality in Mason, Ohio
Mason is in Warren County. 19 active public water systems serve the county; 16 had an EPA violation in the past three years.
Most likely your provider
Other community water systems in Warren County
15 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| South Lebanon City PWS |
7,792 | 3 | 5.7 mi | |
| Lebanon Correctional Institution |
3,410 | 1 | 5.8 mi | |
| Lebanon City |
20,700 | 0 | 7.5 mi | |
| Warren Co. Pennyroyal Area PWS |
950 | 1 | 8.7 mi | |
| Morrow Village PWS |
3,360 | 2 | 10.7 mi | |
| Warren Co. Sharts Road PWS |
145 | 1 | 14.1 mi | |
| Franklin Public Water System |
11,690 | 1 | 14.4 mi | |
| Western Water Company |
39,508 | 1 | 15.0 mi | |
| Springboro PWS |
19,263 | 1 | 15.0 mi | |
| Wayne MHP LP |
175 | 3 | 15.4 mi | |
| Carlisle City PWS |
1,675 | 1 | 16.0 mi | |
| Waynesville Village PWS |
4,100 | 2 | 16.6 mi | |
| Caesars Village MHP PWS |
90 | 3 | 21.2 mi | |
| Otterbein-Lebanon Retreat Center |
1,541 | 3 | — | |
| South Lebanon PWS NO 2 |
180 | 0 | — |
Non-community systems in Warren County (3: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Kings Island PWS |
31,753 | 2 | 0 | |
|
Cookies Market |
100 | 2 | 1 | |
|
Cedar Oaks Wellness Center |
56 | 0 | 0 |
About this data
Water systems are matched to Warren County, nearest to Mason 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.
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 Ohio 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.