Ohio
Montgomery County drinking water quality
71 active public water systems serve 524,180 people in Montgomery County. 25 are compliant, 46 had at least one EPA violation in the past three years, 1 is a designated serious violator, and 0 carry a health flag.
Needs attention
Community water systems
23 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Montgomery County Water Services 1 PWS |
150,207 | 0 | 0 | |
|
Dayton Public Water System |
141,407 | 0 | 0 | |
|
Montgomery County Water Services 2 PWS |
83,033 | 0 | 0 | |
|
Huber Heights Public Water System |
43,439 | 1 | 1 | |
|
Miamisburg City PWS |
19,790 | 1 | 1 | |
|
Englewood City PWS |
13,463 | 0 | 0 | |
|
Oakwood City PWS |
9,572 | 0 | 0 | |
|
Trotwood City PWS |
9,000 | 2 | 1 | |
|
West Carrollton City PWS |
8,361 | 1 | 0 | |
|
Union City PWS |
7,000 | 1 | 1 | |
|
Brookville Municipality PWS |
5,923 | 2 | 0 | |
|
Germantown City PWS |
5,547 | 1 | 1 | |
|
Jefferson Regional Water Authority |
4,813 | 1 | 1 | |
|
New Lebanon Village PWS |
3,770 | 1 | 1 | |
|
Oakwood Village MHP |
1,500 | 3 | 2 | |
|
Farmersville Village PWS |
975 | 1 | 1 | |
|
Phillipsburg Village PWS |
490 | 2 | 1 | |
|
Voyager Village MHP |
400 | 2 | 1 | |
|
Brookville Lake Estates |
211 | 1 | 0 | |
|
Quarry Lakes MHP LLC |
141 | 3 | 0 | |
|
Dayton VA Bldg 410 |
125 | 2 | 1 | |
|
Dayton VA Bldg 320 Pod a |
95 | 2 | 1 | |
|
Sherwood Grove MHP |
30 | 2 | 2 |
Non-community systems (48: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
Inactive systems (183, 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 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.