54 Ohio water districts with results read from their own annual water quality report or EPA testing, largest first.
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- Cleveland Public Water System1,308,955 people · 15 results
- Montgomery County Water Services 1 Pws150,207 people · 12 results
- Del-Co Water Company, INC.150,000 people · 11 results
- Clermont Public Water System134,568 people · 13 results
- Youngstown City Pws130,530 people · 8 results
- Aqua Ohio - Massillon Pws95,636 people · 7 results
- Montgomery County Water Services 2 Pws83,033 people · 19 results
- Warren County78,299 people · 10 results
- Hamilton Public Water System62,447 people · 7 results
- Middletown City Pws51,229 people · 8 results
- Cuyahoga Falls City Pws51,114 people · 5 results
- Lakewood City Pws50,942 people · 7 results
- Newark City Pws49,934 people · 10 results
- Aqua Ohio - Marion46,317 people · 2 results
- Greene Co.-Northwest Reg Water41,000 people · 7 results
- Hecla Water Association34,942 people · 8 results
- Athens Pws32,725 people · 8 results
- Barberton City31,298 people · 11 results
- Kent City Pws29,662 people · 13 results
- Zanesville Pws29,381 people · 8 results
- Highland County Water Company, INC.28,421 people · 10 results
- Medina City Pws25,956 people · 9 results
- Marysville City Pws25,571 people · 11 results
- Nawa24,766 people · 10 results
- North Canton City Pws24,747 people · 12 results
- Wadsworth City Pws24,356 people · 7 results
- Tate-Monroe Water Association Pws24,092 people · 1 results
- Oxford City Pws24,000 people · 1 results
- Avon City Pws23,800 people · 8 results
- Avon Lake City Pws23,659 people · 9 results
- Alliance City Pws22,232 people · 13 results
- Niles City Pws21,961 people · 14 results
- Sylvania City21,618 people · 10 results
- Piqua City Pws20,354 people · 10 results
- Ottawa County Regional Water District19,556 people · 12 results
- Tallmadge City Pws18,000 people · 5 results
- New Philadelphia City Pws17,410 people · 5 results
- Defiance City16,494 people · 14 results
- Girard City14,122 people · 1 results
- Fostoria City13,441 people · 3 results
- Greenville City Pws13,227 people · 1 results
- Van Wert City10,846 people · 4 results
- Aqua Ohio - Lawrence County8,130 people · 9 results
- Aqua Ohio - Blacklick7,100 people · 6 results
- Aqua Ohio - Lake Darby3,562 people · 6 results
- Aqua Ohio - Worthington Hills Pws2,500 people · 6 results
- Aqua Ohio - Mohawk Pws2,376 people · 5 results
- Aqua Ohio - Beechcrest1,496 people · 5 results
- Aqua Ohio - Lake White Pws1,229 people · 4 results
- Aqua Ohio - Timberbrook Pw865 people · 8 results
- Aqua Ohio - Aurora E766 people · 8 results
- Aqua Ohio - Seneca750 people · 7 results
- Aqua Ohio - Shepard Hills Pws725 people · 7 results
- North Ridgeville City Pws9 results
Other districts with a few results read
Search these in the water lookup to see their numbers.
- Aqua Ohio - Mentor · 74,500 people
- Aqua Ohio - Struthers · 58,551 people
- Aqua Ohio - Ashtabula · 32,408 people
- Brown County Rural Water · 32,090 people
- Sidney City Pws · 20,614 people
- Monroe City Pws · 14,269 people
- Washington Court House Pws · 14,100 people
- Englewood City Pws · 13,463 people
- Bucyrus City · 12,570 people
- Celina City · 11,682 people
- Aqua Ohio - Huber Ridge Pws · 6,950 people
- Aqua Ohio - Masury · 4,016 people
- Aqua Ohio - Village of Jefferson · 3,226 people
- Aqua Ohio - Mansfield System #01 · 813 people
- Aqua Ohio - Mansfield System #07 · 766 people