U.S. water systems

Ohio Water Systems

Ohio

2,357 community water systems on record — 1,125 active, 1,232 inactive.

Every active community water system nationwide must produce a Consumer Confidence Report under the EPA's revised rule, effective for reports due July 1, 2027.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace Ohio’s official records. Always confirm current status with Ohio before making decisions based on this information.

Counties in Ohio

Adams County (6)Allen County (23)Ashland County (14)Ashtabula County (19)Athens County (22)Auglaize County (12)Belmont County (22)Brown County (23)Butler County (42)Carroll County (9)Champaign County (15)Clark County (54)Clermont County (26)Clinton County (15)Columbiana County (44)Coshocton County (14)Crawford County (10)Cuyahoga County (21)Darke County (17)Defiance County (14)Delaware County (22)Erie County (21)Fairfield County (39)Fayette County (16)Franklin County (56)Fulton County (18)Gallia County (6)Geauga County (42)Greene County (49)Guernsey County (19)Hamilton County (28)Hancock County (15)Hardin County (15)Harrison County (22)Henry County (19)Highland County (12)Hocking County (13)Holmes County (18)Huron County (31)Jackson County (24)Jefferson County (34)Knox County (26)Lake County (37)Lawrence County (21)Licking County (59)Logan County (22)Lorain County (21)Lucas County (21)Madison County (22)Mahoning County (32)Marion County (12)Medina County (24)Meigs County (8)Mercer County (16)Miami County (30)Monroe County (10)Montgomery County (43)Morgan County (12)Morrow County (13)Muskingum County (36)Noble County (7)Ottawa County (29)Paulding County (9)Perry County (30)Pickaway County (37)Pike County (28)Portage County (64)Preble County (19)Putnam County (18)Richland County (73)Ross County (25)Sandusky County (27)Scioto County (28)Seneca County (18)Shelby County (17)Stark County (91)Summit County (91)Trumbull County (51)Tuscarawas County (24)Union County (8)Van Wert County (9)Vinton County (7)Warren County (52)Washington County (33)Wayne County (57)Williams County (22)Wood County (47)Wyandot County (6)

All community water systems in Ohio

System name	Mailing city	Population served	Status
CLEVELAND PUBLIC WATER SYSTEM	CLEVELAND	1,308,955	Active
COLUMBUS PUBLIC WATER SYSTEM	COLUMBUS	1,305,946	Active
CINCINNATI PUBLIC WATER SYSTEM	CINCINNATI	750,200	Active
CINCINNATI, CITY OF-MILLER	CINCINNATI	686,400	Inactive
COLUMBUS-HAP CREMEAN WTP	COLUMBUS	446,812	Inactive
CLEVELAND,CITY OF-BALDWIN PLT.	CLEVELAND	424,027	Inactive
TOLEDO CITY OF	TOLEDO	360,000	Active
CLEVELAND,CITY OF-MORGAN PLANT	CLEVELAND	352,888	Inactive
COLUMBUS-DUBLIN ROAD WTP	COLUMBUS	331,072	Inactive
CLEVELAND,CITY OF-NOTTINGHAM P	CLEVELAND	326,846	Inactive
AKRON CITY PWS	KENT	280,000	Active
DAYTON, CITY OF-OTTAWA PLANT	DAYTON	236,000	Inactive
CLEVELAND,CITY OF-CROWN PLANT	WESTLAKE	198,665	Inactive
DAYTON, CITY OF-MIAMI PLANT	DAYTON	184,000	Inactive
MONTGOMERY COUNTY WATER SERVICES 1 PWS	KETTERING	150,207	Active
DEL-CO WATER COMPANY, INC.	DELAWARE	150,000	Active
MONTGOMERY CO:WATER SYSTEM # 1	DAYTON	150,000	Inactive
DAYTON PUBLIC WATER SYSTEM	DAYTON	141,407	Active
MONTGOMERY CO,GR.MORAINE-BV.CR	DAYTON	141,000	Inactive
CLERMONT PUBLIC WATER SYSTEM	BATAVIA	133,059	Active
YOUNGSTOWN CITY PWS	YOUNGSTOWN	130,530	Active
COLUMBUS-PARSONS AVENUE WTP	LOCKBOURNE	119,329	Inactive
BUTLER CO. WATER DISTRICT 2 PWS	HAMILTON	116,572	Active
CANTON PUBLIC WATER SYSTEM	CANTON	107,113	Active
AQUA OHIO - MASSILLON PWS	MASSILLON	95,636	Active
CINCINNATI, CITY OF-BOLTON PLT	CINCINNATI	93,600	Inactive
MONTGOMERY COUNTY WATER SERVICES 2 PWS	KETTERING	83,033	Active
WARREN COUNTY	—	81,975	Active
LAKE COUNTY WEST WATER SUBDISTRICT	PAINESVILLE	78,379	Active
AQUA OHIO - MENTOR	MENTOR	74,500	Active
RURAL LORAIN CO. WATER A	LAGRANGE	73,125	Active
CANTON WATER DEPT-SUGARCREEK	CANTON	70,000	Inactive
ELYRIA WATER DEPARTMENT	LORAIN	68,000	Active
LIMA CITY	LIMA	65,619	Active
LORAIN CITY PWS	LORAIN	64,152	Active
CLERMONT COUNTY WATER, BMWTP	AMELIA	63,191	Inactive
HAMILTON PUBLIC WATER SYSTEM	FAIRFIELD	62,447	Active
SPRINGFIELD CITY PWS	SPRINGFIELD	60,680	Active
OH.WATER SER.CO.,MASSILLON	MASSILLON	60,000	Inactive
AQUA OHIO - STRUTHERS	—	58,551	Active
SAN.ENGR,EASTLAKE WATER SUBDIS	PAINESVILLE	58,500	Inactive
FINDLAY CITY PWS	FINDLAY	54,040	Active
HAMILTON/SOUTH WATER PLANT	HAMILTON	52,920	Inactive
MIDDLETOWN CITY PWS	TRENTON	51,229	Active
CUYAHOGA FALLS CITY PWS	CUYAHOGA FALLS	51,114	Active
MANSFIELD CITY	MANSFIELD	51,000	Active
LAKEWOOD CITY PWS	LAKEWOOD	50,942	Active
NEWARK CITY PWS	NEWARK	49,934	Active
WARREN CITY PWS	WARREN	49,130	Active
AQUA OHIO - MARION	MARION	47,102	Active
MEDINA CO/NORTHWEST PWS	—	46,324	Active
CLEVELAND HEIGHTS CITY PWS	CLEVELAND HEIGHTS	46,000	Inactive
FAIRFIELD CITY PWS	HAMILTON	44,907	Active
DELAWARE CITY PWS	DELAWARE	43,895	Active
HUBER HEIGHTS PUBLIC WATER SYSTEM	HUBER HEIGHTS	43,439	Active
SOUTHWEST REGIONAL WATER DISTRICT	HAMILTON	42,856	Active
GREENE CO.-NORTHWEST REG WATER	—	41,895	Active
LAKE COUNTY EAST WATER SUBDISTRICT	PAINESVILLE	40,656	Active
PORTSMOUTH CITY	PORTSMOUTH	40,475	Active
LANCASTER CITY PWS	LANCASTER	40,400	Active
CANTON WATER DEPT-NORTHEAST	CANTON	40,000	Inactive
FINDLAY WATER DEPARTMENT	FINDLAY	40,000	Inactive
WESTERN WATER COMPANY	MORROW	39,508	Active
WESTERVILLE CITY PWS	PATASKALA	39,000	Active
REYNOLDSBURG CITY PWS	REYNOLDSBURG	37,847	Active
WARREN CO. FRANKLIN AREA PWS	LEBANON	36,725	Inactive
STOW PUBLIC WATER SYSTEM	STOW	35,437	Active
ROSS COUNTY WATER CO INC	CHILLICOTHE	35,345	Active
HECLA WATER ASSOCIATION	IRONTON	34,942	Active
FAIRBORN PUBLIC WATER SYSTEM	JAMESTOWN	34,620	Active
GAHANNA CITY PWS	GLENFORD	33,258	Active
ATHENS PWS	ATHENS	32,725	Active
AQUA OHIO - ASHTABULA	ASHTABULA	32,342	Active
BROWN COUNTY RURAL WATER	RIPLEY	32,090	Active
PAINESVILLE CITY PWS	MENTOR	31,728	Active
BOWLING GREEN CITY	BOWLING GREEN	31,578	Active
BARBERTON CITY	NORTON	31,298	Active
BARBERTON WATER DEPARTMENT	BARBERTON	30,000	Inactive
CANTON WATER DEPT-NORTHWEST	CANTON	30,000	Inactive
NAWA	TIPP CITY	29,974	Active
DEL-CO WATER CO/ALUM CR.PLANT	DELAWARE	29,928	Inactive
DEL-CO WATER/OLENTANGY PLANT	DELAWARE	29,928	Inactive
KENT CITY PWS	KENT	29,662	Active
NORTH RIDGEVILLE CITY PWS	NORTH RIDGEVILLE	29,465	Active
ZANESVILLE PWS	ZANESVILLE	29,381	Active
HUBER HEIGHTS-PLANT #1	HUBER HEIGHTS	29,250	Inactive
XENIA CITY PWS	XENIA	29,000	Active
CLERMONT CO/ MGS SUB-DISTRICT	BATAVIA	28,600	Inactive
EAST CLEVELAND CITY PWS	EAST CLEVELAND	28,500	Inactive
HIGHLAND COUNTY WATER COMPANY, INC.	HILLSBORO	28,421	Active
SAN.ENGR,WEST WATER SUBDIST.	PAINESVILLE	27,312	Inactive
PERRYSBURG CITY PWS	WHITEHOUSE	27,000	Active
BELMONT CO. SANITARY DISTRICT 3 PWS	BARNESVILLE	26,822	Active
WOOSTER CITY PWS	WOOSTER	26,618	Active
TROY CITY PWS	ROSSBURG	26,305	Active
MEDINA CITY PWS	MEDINA	25,956	Active
SANDUSKY CITY	SANDUSKY	25,793	Active
MARYSVILLE CITY PWS	MARYSVILLE	25,571	Active
NORTH CANTON CITY PWS	N CANTON	24,747	Active
WADSWORTH CITY PWS	WADSWORTH	24,356	Active
TATE-MONROE WATER ASSOCIATION PWS	NEW RICHMOND	24,092	Active
OXFORD CITY PWS	SOMERVILLE	24,000	Active
AVON CITY PWS	AVON	23,800	Active
AVON LAKE CITY PWS	AVON LAKE	23,659	Active
ALLIANCE CITY PWS	ALLIANCE	22,232	Active
NILES CITY PWS	NILES	21,961	Active
ADAMS COUNTY REGIONAL WD PWS	WEST UNION	21,810	Active
CHILLICOTHE CITY PWS	CHILLICOTHE	21,725	Active
SYLVANIA CITY	SYLVANIA	21,618	Active
MUSKINGUM COUNTY WATER - SE	—	21,540	Active
OHIO-AMER.WATER CO,TIFFIN DIST	TIFFIN	21,000	Inactive
GALLIA CO RURAL WATER ASSOCIATION	GALLIPOLIS	20,995	Active
LEBANON CITY	LEBANON	20,700	Active
ASHLAND CITY	ASHLAND	20,648	Active
SIDNEY CITY PWS	SIDNEY	20,614	Active
OTTAWA COUNTY REGIONAL WATER DISTRICT	PORT CLINTON	20,428	Active
PIQUA CITY PWS	PIQUA	20,354	Active
AQUA OHIO - TIFFIN	MARION	20,279	Active
OHIO WATER SERVICE,LEE/GENEVA	GENEVA	20,000	Inactive
OREGON CITY	OREGON	19,950	Active
NORWOOD CITY PWS	NORWOOD	19,870	Active
MIAMISBURG CITY PWS	MIAMISBURG	19,790	Active
NORTHWESTERN W AND SD - TOLEDO SVC AREA	BOWLING GREEN	19,758	Active
LE-AX REGIONAL WATER DISTRICT PWS	ATHENS	19,311	Active
SPRINGBORO PWS	SPRINGBORO	19,263	Active
PICKERINGTON CITY PWS	PICKERINGTON	19,141	Active
SWR WATER DISTRICT SOUTH PLANT PWS	FAIRFIELD	19,098	Inactive
BEREA CITY PWS	BEREA	18,789	Active
MARIETTA CITY PWS	MARIETTA	18,707	Active
MONTGOMERY CO.RIVERSIDE SUBDIS	DAYTON	18,700	Inactive
TALLMADGE CITY PWS	TALLMADGE	18,394	Active
FREMONT CITY	FREMONT	18,319	Active
NORTHERN OHIO RURAL WATER	NORWALK	18,224	Active
LICKING REGIONAL WATER DISTRICT	BALTIMORE	17,818	Active
SUPT,BELMONT CO.SAN.DIST.NO.3	SAINT CLAIRSVILLE	17,800	Inactive
NORWALK CITY PWS	NORWALK	17,466	Active
NEW PHILADELPHIA CITY PWS	NEW PHILADELPHIA	17,410	Active
ERIE CO PERKINS DISTRICT	HURON	17,241	Active
STEUBENVILLE, CITY OF	STEUBENVILLE	17,000	Active
MOUNT VERNON CITY PWS	MOUNT VERNON	16,990	Active
SALEM CITY	SALEM	16,850	Active
WRIGHT-PATTERSON AFB AREA A PWS	—	16,551	Active
DEFIANCE CITY	DEFIANCE	16,494	Active
TUPPERS PLAINS/CHESTER WATER DISTRICT	LONG BOTTOM	16,087	Active
DUBLIN, CITY OF	DUBLIN	16,000	Inactive
RAVENNA CITY PWS	RAVENNA	16,000	Active
SUPT,RAVENNA WATER DEPARTMENT	RAVENNA	16,000	Inactive
JACKSON CO. WATER COMPANY-WTP	—	15,984	Active
SWR DIST SOUTH PLANT	HAMILTON	15,977	Inactive
AURORA CITY - CLEVELAND PWS	AURORA	15,852	Active
MONROE CITY PWS	MONROE	15,600	Active
PIKE WATER, INC.-PLANT PWS	WAVERLY	15,487	Active
FAIRFIELD COUNTY UTILITIES PWS	LANCASTER	15,486	Active
MGR;HIGHLAND COUNTY WATER CO.	HILLSBORO	15,127	Inactive
STREETSBORO CITY PWS	STREETSBORO	15,105	Active
INDIAN HILL CITY PWS	CINCINNATI	15,000	Active
VANDALIA CITY PWS	VANDALIA	15,000	Inactive
ASHTABULA COUNTY WATER SYSTEM	JEFFERSON	14,757	Active
MAUMEE CITY	MAUMEE	14,286	Active
BEXLEY CITY PWS	BEXLEY	14,250	Active
GIRARD CITY	GIRARD	14,122	Active
WASHINGTON COURT HOUSE PWS	WILLIAMSPORT	14,100	Active
JEFFERSON CO W AND S DISTRICT - M	STEUBENVILLE	13,983	Active
CIRCLEVILLE CITY PWS	CIRCLEVILLE	13,927	Active
SCIOTO CO. REGIONAL WATER DISTRICT #1	LUCASVILLE	13,820	Active
COSHOCTON PWS	COSHOCTON	13,537	Active
ENGLEWOOD CITY PWS	ENGLEWOOD	13,463	Active
FOSTORIA CITY	FOSTORIA	13,441	Active
DOVER CITY PWS	DOVER	13,253	Active
BELLEFONTAINE CITY PWS	BELLEFONTAINE	13,249	Active
GREENVILLE CITY PWS	GREENVILLE	13,227	Active
WARREN CO. SOCIALVILLE PWS	—	13,216	Active
BEDFORD CITY PWS	BEDFORD	13,149	Active
TRENTON CITY PWS	TRENTON	13,012	Active
WATER SUPT,THIMBLE CREEK SD	DAYTON	12,856	Inactive
LOVELAND CITY PWS	LOVELAND	12,800	Active
EAST LIVERPOOL CITY	EAST LIVERPOOL	12,586	Active
BUCYRUS CITY	BUCYRUS	12,570	Active
CONNEAUT	CONNEAUT	12,538	Active
WILMINGTON CITY PWS	WILMINGTON	12,401	Active
AMHERST CITY PWS	AMHERST	11,797	Active
WATER SUPT,MEADOWDALE SWD.	DAYTON	11,704	Inactive
FRANKLIN PUBLIC WATER SYSTEM	FRANKLIN	11,690	Active
CELINA, CITY OF	CELINA	11,682	Active
SUPT,CIRCLEVILLE WATER DEPT.	CIRCLEVILLE	11,682	Inactive
HARRISON CITY PWS	HARRISON	11,600	Active
URBANA CITY PWS	URBANA	11,428	Active
JEFFERSON WATER AND SEWER DISTRICT PWS	BLACKLICK	11,294	Active
SAN.ENGR,EAST WATER SUBDIST.	PAINESVILLE	11,200	Inactive
IRONTON	IRONTON	11,129	Active
NORTHWEST REGIONAL WATER DISTRICT	MCDERMOTT	11,059	Active
WRIGHT-PATTERSON AFB AREA B PWS	—	11,034	Active
MASON, CITY OF	MASON	11,000	Inactive
MASON, CITY OF - SOUTH	MASON	11,000	Inactive
WAPAKONETA CITY PWS	WAPAKONETA	11,000	Active
VAN WERT CITY	VAN WERT	10,846	Active
VERMILION CITY	VERMILION	10,594	Active
CAMBRIDGE, CITY OF	CAMBRIDGE	10,520	Active
GALION CITY	GALION	10,453	Active
CITY OF HEATH PWS	HEATH	10,310	Active

Showing the 200 largest of 2,357 systems on record, by population served. Browse by county above for the full list — every system has its own page, and all of them are in the sitemap.