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AquaCensus

Ohio public water systems

3,854 active systems regulated under the Safe Drinking Water Act, serving a reported 10.7M people across 133 counties.

Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.

Active systems

3,854

Population served

10.7M

Community systems

1,028

Groundwater share

92.4%

System types in Ohio

1,028

Community water system

544

Non-transient non-community water system

2,282

Transient non-community water system

Largest water systems in Ohio

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The largest active public water systems in Ohio by population served
#Water systemCountyPopulation servedTypeSource
1Cleveland Public Water SystemCuyahoga1,308,955CommunitySurface water
2Columbus Public Water SystemFranklin1,305,946CommunitySurface water
3Cincinnati Public Water SystemHamilton750,200CommunitySurface water
4Toledo City ofLucas360,000CommunitySurface water
5Akron City PwsSummit280,000CommunitySurface water
6Montgomery County Water Services 1 PwsMontgomery150,207CommunityPurchased surface water
7Del-Co Water Company, Inc..Delaware150,000CommunitySurface water
8Dayton Public Water SystemMontgomery141,407CommunitySurface water
9Clermont Public Water SystemClermont133,059CommunitySurface water
10Youngstown City PwsMahoning130,530CommunityPurchased surface water
11Butler Co. Water District 2 PwsButler116,572CommunityPurchased surface water
12Canton Public Water SystemStark107,113CommunityGroundwater
13Aqua Ohio - Massillon PwsStark95,636CommunityGroundwater
14Montgomery County Water Services 2 PwsMontgomery83,033CommunityPurchased surface water
15Lake County West Water SubdistrictLake78,379CommunitySurface water
16Aqua Ohio - MentorLake74,500CommunitySurface water
17Rural Lorain Co. Water ALorain73,125CommunityPurchased surface water
18Elyria Water DepartmentLorain68,000CommunitySurface water
19Lima CityAllen65,619CommunitySurface water
20Lorain City PwsLorain64,152CommunitySurface water
21Hamilton Public Water SystemButler62,447CommunityGroundwater
22Springfield City PwsClark60,680CommunityGroundwater
23Findlay City PwsHancock54,040CommunitySurface water
24Middletown City PwsButler51,229CommunityGroundwater
25Cuyahoga Falls City PwsSummit51,114CommunityGroundwater

By county

Geauga228 systemsSummit193 systemsStark167 systemsWayne156 systemsPortage145 systemsLogan124 systemsRichland106 systemsColumbiana98 systemsFranklin90 systemsHolmes83 systemsLicking79 systemsTrumbull79 systemsClark78 systemsMercer77 systemsTuscarawas76 systemsFairfield70 systemsMontgomery69 systemsDarke66 systemsMahoning65 systemsSeneca56 systemsMedina55 systemsMadison53 systemsSandusky52 systemsCarroll51 systemsAshtabula50 systemsWood50 systemsAshland46 systemsGreene46 systemsMiami46 systemsLucas44 systemsWilliams43 systemsHocking42 systemsKnox40 systemsAllen39 systemsChampaign39 systemsHancock37 systemsShelby37 systemsOttawa36 systemsPutnam36 systemsUnion34 systemsJefferson33 systemsPickaway32 systemsHardin31 systemsVan Wert31 systemsCoshocton30 systemsAuglaize29 systemsMarion28 systemsHarrison28 systemsPreble28 systemsHamilton26 systemsDefiance25 systemsPaulding25 systemsPerry25 systemsHenry23 systemsFulton22 systemsWyandot22 systemsBelmont20 systemsButler20 systemsLake20 systemsHuron19 systemsMuskingum19 systemsWashington18 systemsScioto17 systemsLorain16 systemsMorrow16 systemsWarren16 systemsPike15 systemsMorgan14 systemsAthens13 systemsCrawford13 systemsErie13 systemsFayette13 systemsGuernsey13 systemsCuyahoga11 systemsClinton9 systemsClermont9 systemsHighland9 systemsMeigs8 systemsRoss8 systemsBrown7 systemsAdams6 systemsLawrence6 systemsMonroe6 systemsNoble6 systemsJackson5 systemsDelaware4 systemsVinton4 systemsGratiot3 systemsBranch3 systemsHillsdale3 systemsGallia3 systemsBedford3 systems
Benzie2 systems
Shiawassee2 systems
Muskegon2 systems
Genesee2 systems
Venango2 systems
Lancaster2 systems
Shasta1 systems
Marshall1 systems
Randolph1 systems
Frederick1 systems
Garrett1 systems
Berrien1 systems
Cass1 systems
Isabella1 systems
Sanilac1 systems
Clare1 systems
Manistee1 systems
Marquette1 systems
Newaygo1 systems
St. Clair1 systems
Otsego1 systems
Emmet1 systems
Barry1 systems
Mecosta1 systems
Roscommon1 systems
Allegan1 systems
Lenawee1 systems
Guilford1 systems
Pershing1 systems
Custer1 systems
Luzerne1 systems
Berks1 systems
Lehigh1 systems
Schuylkill1 systems
Lebanon1 systems
Orangeburg1 systems
Brazoria1 systems
Colorado1 systems
Harris1 systems
Accomack1 systems
New Kent1 systems