Ohio water providers

Find published drinking-water records, providers, and official agency resources for Ohio. Review sources, sample dates, and coverage.

Official drinking-water resources

• Ohio Environmental Protection Agency - Division of Drinking & Ground Waters
• Ohio Drinking Water Viewer

The responsible agency may differ for tribal systems. Record availability and sample dates vary by provider.

Community systems appear first. Sort: Population served · A–Z

Public water systems

4,165 systems in the imported directory. Includes community systems, schools, workplaces, and other public systems.

• Cleveland Public Water SystemOH1801212 · CWS · Population served: 1,308,955
• Columbus Public Water SystemOH2504412 · CWS · Population served: 1,305,946
• Cincinnati Public Water SystemOH3102612 · CWS · Population served: 750,200
• City of ToledoOH4801411 · CWS · Population served: 360,000
• Akron City PWSOH7700011 · CWS · Population served: 280,000
• Montgomery County Water Services 1 PWSOH5701315 · CWS · Population served: 150,207
• Del-Co Water Company, Inc.OH2101412 · CWS · Population served: 150,000
• Dayton Public Water SystemOH5703512 · CWS · Population served: 141,407
• Clermont Public Water SystemOH1302212 · CWS · Population served: 133,059
• Youngstown City PWSOH5002303 · CWS · Population served: 130,530
• Butler Co. Water District 2 PWSOH0900303 · CWS · Population served: 116,572
• Canton Public Water SystemOH7608112 · CWS · Population served: 107,113
• Aqua Ohio - Massillon PWSOH7604512 · CWS · Population served: 95,636
• Montgomery County Water Services 2 PWSOH5701503 · CWS · Population served: 83,033
• Warren CountyOH8301512 · CWS · Population served: 81,975
• Lake County West Water SubdistrictOH4302411 · CWS · Population served: 78,379
• Aqua Ohio - MentorOH4301511 · CWS · Population served: 74,500
• Rural Lorain Co. Water AOH4701803 · CWS · Population served: 73,125
• Elyria Water DepartmentOH4700411 · CWS · Population served: 68,000
• Lima CityOH0200811 · CWS · Population served: 65,619
• Lorain City PWSOH4700711 · CWS · Population served: 64,152
• Hamilton Public Water SystemOH0904012 · CWS · Population served: 62,447
• Springfield City PWSOH1204412 · CWS · Population served: 60,680
• Aqua Ohio - StruthersOH5001611 · CWS · Population served: 58,551
• Findlay City PWSOH3200111 · CWS · Population served: 54,040
• Middletown City PWSOH0901712 · CWS · Population served: 51,229
• Cuyahoga Falls City PWSOH7701012 · CWS · Population served: 51,114
• Mansfield CityOH7002914 · CWS · Population served: 51,000
• Lakewood City PWSOH1801003 · CWS · Population served: 50,942
• Newark City PWSOH4502314 · CWS · Population served: 49,934
• Warren City PWSOH7803811 · CWS · Population served: 49,130
• Aqua Ohio - MarionOH5100414 · CWS · Population served: 47,102
• Medina Co/Northwest PWSOH5201903 · CWS · Population served: 46,324
• Fairfield City PWSOH0900715 · CWS · Population served: 44,907
• Delaware City PWSOH2100311 · CWS · Population served: 43,895
• Huber Heights Public Water SystemOH5703612 · CWS · Population served: 43,439
• Southwest Regional Water DistrictOH0903912 · CWS · Population served: 42,856
• Greene Co.-Northwest Reg WaterOH2903512 · CWS · Population served: 41,895
• Lake County East Water SubdistrictOH4302911 · CWS · Population served: 40,656
• Portsmouth CityOH7300111 · CWS · Population served: 40,475
• Lancaster City PWSOH2301012 · CWS · Population served: 40,400
• Western Water CompanyOH8300512 · CWS · Population served: 39,508
• Westerville City PWSOH2503411 · CWS · Population served: 39,000
• Reynoldsburg City PWSOH2503203 · CWS · Population served: 37,847
• Stow Public Water SystemOH7704503 · CWS · Population served: 35,437
• Ross County Water Co IncOH7101412 · CWS · Population served: 35,345
• Hecla Water AssociationOH4401612 · CWS · Population served: 34,942
• Fairborn Public Water SystemOH2900612 · CWS · Population served: 34,620
• Gahanna City PWSOH2501303 · CWS · Population served: 33,258
• Athens PWSOH0500212 · CWS · Population served: 32,725
• Aqua Ohio - AshtabulaOH0400711 · CWS · Population served: 32,342
• Brown County Rural WaterOH0802012 · CWS · Population served: 32,090
• Painesville City PWSOH4301611 · CWS · Population served: 31,728
• Bowling Green CityOH8700311 · CWS · Population served: 31,578
• Barberton CityOH7700411 · CWS · Population served: 31,298
• NawaOH5553612 · CWS · Population served: 29,974
• Kent City PWSOH6701812 · CWS · Population served: 29,662
• North Ridgeville City PWSOH4700803 · CWS · Population served: 29,465
• Zanesville PWSOH6002712 · CWS · Population served: 29,381
• Xenia City PWSOH2902812 · CWS · Population served: 29,000
• Highland County Water Company, Inc.OH3600514 · CWS · Population served: 28,421
• Perrysburg City PWSOH8701803 · CWS · Population served: 27,000
• Belmont Co. Sanitary District 3 PWSOH0700412 · CWS · Population served: 26,822
• Wooster City PWSOH8504512 · CWS · Population served: 26,618
• Troy City PWSOH5501612 · CWS · Population served: 26,305
• Medina City PWSOH5200514 · CWS · Population served: 25,956
• Sandusky CityOH2201411 · CWS · Population served: 25,793
• Marysville City PWSOH8000314 · CWS · Population served: 25,571
• North Canton City PWSOH7604312 · CWS · Population served: 24,747
• Wadsworth City PWSOH5201712 · CWS · Population served: 24,356
• Tate-Monroe Water Association PWSOH1301312 · CWS · Population served: 24,092
• Oxford City PWSOH0902312 · CWS · Population served: 24,000
• Avon City PWSOH4700203 · CWS · Population served: 23,800
• Avon Lake City PWSOH4700311 · CWS · Population served: 23,659
• Alliance City PWSOH7600011 · CWS · Population served: 22,232
• Niles City PWSOH7802403 · CWS · Population served: 21,961
• Adams County Regional Wd PWSOH0100012 · CWS · Population served: 21,810
• Chillicothe City PWSOH7100112 · CWS · Population served: 21,725
• Sylvania CityOH4801303 · CWS · Population served: 21,618
• Muskingum County Water - SeOH6000412 · CWS · Population served: 21,540
• Gallia Co Rural Water AssociationOH2700012 · CWS · Population served: 20,995
• Lebanon CityOH8304112 · CWS · Population served: 20,700
• Ashland CityOH0300112 · CWS · Population served: 20,648
• Sidney City PWSOH7501214 · CWS · Population served: 20,614
• Ottawa County Regional Water DistrictOH6205011 · CWS · Population served: 20,428
• Piqua City PWSOH5501211 · CWS · Population served: 20,354
• Aqua Ohio - TiffinOH7400614 · CWS · Population served: 20,279
• Oregon CityOH4800911 · CWS · Population served: 19,950
• Norwood City PWSOH3101703 · CWS · Population served: 19,870
• Miamisburg City PWSOH5701212 · CWS · Population served: 19,790
• Northwestern W And Sd - Toledo Svc AreaOH8752812 · CWS · Population served: 19,758
• Le-Ax Regional Water District PWSOH0501111 · CWS · Population served: 19,311
• Springboro PWSOH8301412 · CWS · Population served: 19,263
• Pickerington City PWSOH2301512 · CWS · Population served: 19,141
• Berea City PWSOH1800111 · CWS · Population served: 18,789
• Marietta City PWSOH8400412 · CWS · Population served: 18,707
• Tallmadge City PWSOH7704703 · CWS · Population served: 18,394
• Fremont CityOH7200311 · CWS · Population served: 18,319
• Northern Ohio Rural WaterOH3902403 · CWS · Population served: 18,224
• Licking Regional Water DistrictOH4505412 · CWS · Population served: 17,818