State system profile

PFAS in Ohio drinking water

Active community water systems with complete EPA UCMR 5 monitoring, summarized using yearly averages from results available through January 15, 2026.

Source EPA UCMR 5 Period 2023–2025 Systems included 300 Release ucmr5-2026-01-15-analysis-v0.2
Systems with a yearly average at or above an EPA-based study benchmark
9.7%29 of 300 active community water systems

All 300 systems had enough required samples to calculate a yearly average. 29 had at least one yearly average at or above a study benchmark; 271 did not.

EPA-based study benchmark: the unrounded cutoff this research uses to reproduce EPA’s January 2026 technical-assistance classification around the April 2024 federal levels. It is not a current standard or compliance finding and cannot determine household exposure or health risk.

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Compound summary

System counts in Ohio

Each count shows how many included water systems had a yearly average at or above the named study benchmark.

Community water systems with yearly averages at or above the EPA-based study benchmarks used in the January 2026 research release for Ohio.
Study benchmarkSystems at or above benchmarkWater systems includedPercent
PFOA: 4.05 ppt study benchmark (reproduces EPA classification around 4 ppt)133004.3%
PFOS: 4.05 ppt study benchmark (reproduces EPA classification around 4 ppt)193006.3%
PFHxS: 15 ppt study benchmark (reproduces EPA classification around 10 ppt)13000.3%
PFNA: 15 ppt study benchmark (reproduces EPA classification around 10 ppt)03000.0%
HFPO-DA: 15 ppt study benchmark (reproduces EPA classification around 10 ppt)03000.0%
Hazard Index: 1.5 study benchmark with at least two detected components (reproduces EPA classification around 1)13000.3%
System directory

Community water systems with complete monitoring

“Complete monitoring” means at least one sampling location had all required samples needed for a yearly average. Each PWSID appears once, preventing double counting across ZIP associations.

Active community water systems with complete UCMR 5 monitoring in Ohio.
Public water systemPWSIDPopulation servedPrimary sourceSampling locationsStudy benchmark result
ADA VILLAGEOH33000125,334Ground water1Below all study benchmarks
ADAMS COUNTY REGIONAL WD PWSOH010001221,810Ground water1Below all study benchmarks
AKRON CITY PWSOH7700011280,000Surface water1Below all study benchmarks
ALLIANCE CITY PWSOH760001122,232Surface water1Below all study benchmarks
AMHERST CITY PWSOH470000311,797Surface water purchased2Below all study benchmarks
ANDOVER-CAMPLANDS WATEROH04002126,009Ground water1Below all study benchmarks
AQUA OHIO - ASHTABULAOH040071132,342Surface water1Below all study benchmarks
AQUA OHIO - AURORA EOH6700512766Ground water purchased1Below all study benchmarks
AQUA OHIO - BLACKLICKOH25024127,100Ground water1Below all study benchmarks
AQUA OHIO - HUBER RIDGE PWSOH25025125,393Ground water1Below all study benchmarks
AQUA OHIO - LAKE DARBYOH25026123,562Ground water1Below all study benchmarks
AQUA OHIO - LAWRENCE COUNTYOH44008038,130Surface water purchased1Below all study benchmarks
AQUA OHIO - MARIONOH510041447,102Surface water1Below all study benchmarks
AQUA OHIO - MASSILLON PWSOH760451295,636Ground water1Below all study benchmarks
AQUA OHIO - MASURYOH78027114,019Surface water purchased1Below all study benchmarks
AQUA OHIO - MENTOROH430151174,500Surface water1Below all study benchmarks
AQUA OHIO - STRUTHERSOH500161158,551Surface water1Below all study benchmarks
AQUA OHIO - TIFFINOH740061420,279Surface water1Below all study benchmarks
AQUA OHIO - VILLAGE OF JEFFERSONOH04018123,226Surface water purchased1Below all study benchmarks
ARCHBOLD VILLAGEOH26000115,586Surface water1Below all study benchmarks
ASHLAND CITYOH030011220,648Ground water1Below all study benchmarks
ASHVILLE VILLAGE PWSOH65000124,529Ground water1Below all study benchmarks
ATHENS PWSOH050021232,725Ground water1Below all study benchmarks
AURORA CITY - CLEVELAND PWSOH678911215,852Surface water purchased1Below all study benchmarks
AVON CITY PWSOH470020323,800Surface water purchased3Below all study benchmarks
AVON LAKE CITY PWSOH470031123,659Surface water1Below all study benchmarks
BARBERTON CITYOH770041131,298Surface water1Below all study benchmarks
BARNESVILLE, OHOH07000116,500Surface water1At or above a study benchmark
BEDFORD CITY PWSOH180000313,149Surface water purchased1Below all study benchmarks
BELLAIRE PUBLIC WATER SYSTEMOH07001144,278Surface water1Below all study benchmarks
BELLEFONTAINE CITY PWSOH460011213,249Ground water1Below all study benchmarks
BELLEVUE CITYOH39000118,236Surface water1Below all study benchmarks
BELMONT CO. SANITARY DISTRICT 3 PWSOH070041226,822Ground water1Below all study benchmarks
BELPRE CITY PWSOH84000126,441Ground water1Below all study benchmarks
BEREA CITY PWSOH180011118,789Surface water1Below all study benchmarks
BETHEL VILLAGE PWSOH13001162,620Ground water purchased1At or above a study benchmark
BEXLEY CITY PWSOH250010314,250Surface water purchased2Below all study benchmarks
BLANCHESTER VILLAGE PWSOH14001114,243Surface water1Below all study benchmarks
BOWLING GREEN CITYOH870031131,578Surface water1Below all study benchmarks
BRADFORD VILLAGE PWSOH19002122,000Ground water1Below all study benchmarks
BROOKVILLE MUNICIPALITY PWSOH57002035,923Surface water purchased1Below all study benchmarks
BROWN COUNTY RURAL WATEROH080201232,090Ground water1Below all study benchmarks
BRYAN CITYOH86000128,729Ground water1Below all study benchmarks
BUCKEYE WATER DISTRICT - OHIO RIVEROH150291110,300Surface water1Below all study benchmarks
BUCYRUS CITYOH170001112,570Surface water1Below all study benchmarks
BUTLER CO. WATER DISTRICT 2 PWSOH0900303116,572Surface water purchased2Below all study benchmarks
BYESVILLEOH30012125,104Groundwater under influence of surface water1Below all study benchmarks
CADIZ VILLAGE PWSOH34002143,353Surface water1Below all study benchmarks
CAMBRIDGE, CITY OFOH300011110,520Surface water1At or above a study benchmark
CANAL WINCHESTER CITY PWSOH25003129,286Ground water1Below all study benchmarks
CANFIELD CITY PWSOH50005037,706Surface water purchased1At or above a study benchmark
CANTON PUBLIC WATER SYSTEMOH7608112107,113Ground water3Below all study benchmarks
CAREY VILLAGEOH88000123,674Ground water1Below all study benchmarks
CEDARVILLE UNIVERSITYOH29036124,000Ground water1Below all study benchmarks
CELINA CITYOH540001111,682Surface water1Below all study benchmarks
CHAGRIN FALLS VILLAGE PWSOH18002124,991Surface water purchased2Below all study benchmarks
CHARDON CITY PWSOH28004125,247Ground water1Below all study benchmarks
CHILLICOTHE CITY PWSOH710011221,725Ground water1Below all study benchmarks
CHILLICOTHE CORRECTIONAL INSTITUTIONOH71012129,000Ground water1Below all study benchmarks
CINCINNATI PUBLIC WATER SYSTEMOH3102612750,200Surface water2At or above a study benchmark
CIRCLEVILLE CITY PWSOH650041213,927Ground water1Below all study benchmarks
CITY OF HEATH PWSOH450091210,310Ground water1Below all study benchmarks
CLARK COUNTY GREEN MEADOWS 2 PWSOH12007033,008Ground water purchased1Below all study benchmarks
CLARK COUNTY NORTHRIDGE PWSOH12010038,874Ground water purchased1Below all study benchmarks
CLARK COUNTY PARK LAYNE PWSOH12011124,221Ground water1Below all study benchmarks
CLERMONT PUBLIC WATER SYSTEMOH1302212133,059Surface water3At or above a study benchmark
CLEVELAND PUBLIC WATER SYSTEMOH18012121,308,955Surface water4Below all study benchmarks
CLEVES VILLAGE PWSOH31005126,000Ground water1Below all study benchmarks
COLDWATER VILLAGEOH54001124,774Ground water1Below all study benchmarks
COLUMBIANA CITY PWSOH15003126,727Ground water1Below all study benchmarks
COLUMBUS GROVE VILLAGEOH69001122,137Ground water1Below all study benchmarks
COLUMBUS PUBLIC WATER SYSTEMOH25044121,305,946Surface water3Below all study benchmarks
COMMERCIAL POINT VILLAGEOH65035123,497Ground water1Below all study benchmarks
CONNEAUTOH040041112,538Surface water1Below all study benchmarks
CORTLAND CITY PWSOH78005127,105Ground water3Below all study benchmarks
COSHOCTON PWSOH160001213,537Ground water1Below all study benchmarks
CRESTLINE VILLAGEOH17001124,525Ground water1Below all study benchmarks
CUYAHOGA FALLS CITY PWSOH770101251,114Ground water1Below all study benchmarks
DAYTON PUBLIC WATER SYSTEMOH5703512141,407Surface water2At or above a study benchmark
DAYTON VA BLDG 410OH5750618125Surface water purchased1At or above a study benchmark
DEFIANCE CITYOH200011116,494Surface water1Below all study benchmarks
DEL-CO WATER COMPANY, INC.OH2101412150,000Surface water3Below all study benchmarks
DELAWARE CITY PWSOH210031143,895Surface water1Below all study benchmarks
DELPHOS CITYOH02004127,101Surface water1Below all study benchmarks
DELTA VILLAGEOH26003113,518Surface water1Below all study benchmarks
DOVER CITY PWSOH790041213,253Ground water1Below all study benchmarks
EARNHART HILL WATER DISTRICT PWSOH650081210,057Ground water1Below all study benchmarks
EAST LIVERPOOL CITYOH150081112,586Surface water1Below all study benchmarks
EAST PALESTINE VILLAGE PWSOH15009124,761Ground water1Below all study benchmarks
EATON PUBLIC WATER SYSTEMOH68016128,400Ground water2Below all study benchmarks
ELIDA VILLAGEOH02005034,109Surface water purchased1Below all study benchmarks
ELYRIA WATER DEPARTMENTOH470041168,000Surface water1Below all study benchmarks
ENGLEWOOD CITY PWSOH570081213,463Ground water1Below all study benchmarks
FAIRBORN PUBLIC WATER SYSTEMOH290061234,620Ground water1Below all study benchmarks
FAIRFIELD CITY PWSOH090071544,907Ground water1Below all study benchmarks
FAIRFIELD COUNTY UTILITIES PWSOH230191215,486Ground water1Below all study benchmarks
FELICITY VILLAGE PWSOH13006121,573Ground water1Below all study benchmarks
FINDLAY CITYOH320011154,040Surface water1Below all study benchmarks
FOSTORIA CITYOH740041113,441Surface water1Below all study benchmarks
FRANKLIN PUBLIC WATER SYSTEMOH830041211,690Ground water1Below all study benchmarks
FREMONT CITYOH720031118,319Surface water1Below all study benchmarks
GAHANNA CITY PWSOH250130333,258Surface water purchased1Below all study benchmarks
GALION CITYOH170021110,453Surface water1Below all study benchmarks
GALLIA CO RURAL WATER ASSOCIATIONOH270001220,995Ground water1At or above a study benchmark
GENEVA CITY PWSOH04017125,924Surface water purchased1Below all study benchmarks
GEORGETOWN VILLAGE PWSOH08005034,331Ground water purchased1Below all study benchmarks
GERMANTOWN CITY PWSOH57010125,547Ground water1Below all study benchmarks
GNADENHUTTEN PWSOH79005121,240Ground water1Below all study benchmarks
GREENE CO.-NORTHWEST REG WATEROH290351241,895Ground water2Below all study benchmarks
GREENE COUNTY EASTERN REGIONAL PWSOH29061034,800Ground water purchased1Below all study benchmarks
GREENFIELD TWP WATER DISTRICTOH2301812490Ground water1Below all study benchmarks
GREENFIELD VILLAGE PWSOH36003124,600Ground water1Below all study benchmarks
GROVEPORT PWSOH25015123,229Ground water1Below all study benchmarks
HAMILTON PUBLIC WATER SYSTEMOH090401262,447Ground water2Below all study benchmarks
HARRISON CITY PWSOH310081211,600Ground water1Below all study benchmarks
HECLA WATER ASSOCIATION-PLANT PWSOH440161234,942Surface water purchased2Below all study benchmarks
HICKSVILLE VILLAGEOH20002123,600Ground water1Below all study benchmarks
HIGHLAND COUNTY WATER COMPANY, INC.OH360051428,421Ground water1Below all study benchmarks
HUBBARD CITY PWSOH78014158,518Surface water purchased1Below all study benchmarks
HUBER HEIGHTS PUBLIC WATER SYSTEMOH570361243,439Ground water1Below all study benchmarks
HUDSON CITY PWSOH77016128,385Ground water1Below all study benchmarks
HURON CITYOH22010116,893Surface water1Below all study benchmarks
I-71 AND SR-35 PWSOH24374127,685Surface water1Below all study benchmarks
INDIAN HILL CITY PWSOH310111215,000Ground water1At or above a study benchmark
IRONTON PWSOH440071111,129Surface water1Below all study benchmarks
JACKSON CO. WATER COMPANY-WTPOH400201215,984Ground water1Below all study benchmarks
JACKSON, CITY OFOH40001119,691Surface water1Below all study benchmarks
JEFFERSON REGIONAL WATER AUTHORITYOH57030124,813Ground water1Below all study benchmarks
JEFFERSON WATER AND SEWER DISTRICT PWSOH250401211,294Ground water1Below all study benchmarks
JOHNSTOWN VILLAGE PWSOH45015125,200Ground water1Below all study benchmarks
KENT CITY PWSOH670181229,662Ground water1Below all study benchmarks
KENTON CITYOH33006128,360Ground water1Below all study benchmarks
KNOX COUNTY WATER AND WASTEWATER PWSOH42020127,710Ground water1Below all study benchmarks
LAKE COUNTY EAST WATER SUBDISTRICTOH430291140,656Surface water1Below all study benchmarks
LAKE COUNTY WEST WATER SUBDISTRICTOH430241178,379Surface water1Below all study benchmarks
LAKEWOOD CITY PWSOH180100350,942Surface water purchased1Below all study benchmarks
LANCASTER CITY PWSOH230101240,400Ground water2Below all study benchmarks
LE-AX REGIONAL WATER DISTRICT PWSOH050111119,311Ground water1Below all study benchmarks
LEADING CREEK CONSERVANCY DISTRICTOH53000126,663Ground water1At or above a study benchmark
LEBANON CITYOH830411220,700Surface water purchased1Below all study benchmarks
LEBANON CORRECTIONAL INSTITUTIONOH83010123,410Ground water1Below all study benchmarks
LEXINGTON VILLAGEOH70022124,825Ground water1Below all study benchmarks
LIMA CITYOH020081165,619Surface water1Below all study benchmarks
LITTLE HOCKING WATER ASSOCIATION, INC.OH84002129,892Ground water1Below all study benchmarks
LOCKLAND VILLAGE PWSOH31012123,486Ground water1Below all study benchmarks
LOGAN, CITY OFOH37006126,704Ground water1Below all study benchmarks
LONDON CITY PWSOH490071210,256Ground water1Below all study benchmarks
LORAIN CITY PWSOH470071164,152Surface water1Below all study benchmarks
LORDSTOWN VILLAGE PWSOH78044033,515Surface water purchased1At or above a study benchmark
LOUISVILLE CITY PWSOH76030129,186Ground water1Below all study benchmarks
LOVELAND CITY PWSOH130081212,800Ground water1At or above a study benchmark
MADISON COUNTY SSWD WATER DISTRICT 1OH49010125,176Ground water1Below all study benchmarks
MALVERN VILLAGE PWSOH10001121,200Ground water1Below all study benchmarks
MANSFIELD CITYOH700291451,000Surface water1Below all study benchmarks
MARIETTA CITY PWSOH840041218,707Ground water1At or above a study benchmark
MAUMEE CITYOH480060314,286Surface water purchased1Below all study benchmarks
MAYSVILLE REGIONAL WATEROH60014116,540Ground water purchased1Below all study benchmarks
MCDONALD VILLAGE PWSOH78020034,236Surface water purchased1At or above a study benchmark
MEDINA CITY PWSOH520051425,956Surface water purchased1Below all study benchmarks
MEDINA CO/SOUTHERN WATER DIST PWSOH52607124,708Ground water2Below all study benchmarks
MIAMI CO-CAMP TROY PWSOH55025033,742Ground water purchased1Below all study benchmarks
MIAMISBURG CITY PWSOH570121219,790Ground water1Below all study benchmarks
MID-OHIO WSD PLAIN CITY WTPOH49011124,467Ground water1Below all study benchmarks
MIDDLETOWN CITY PWSOH090171251,229Ground water1Below all study benchmarks
MILFORD CITY PWSOH13010126,700Ground water1At or above a study benchmark
MILLERSBURG VILLAGE PWSOH38009123,151Ground water1Below all study benchmarks
MINERVA VILLAGE PWSOH76038123,684Ground water1Below all study benchmarks
MONROE CITY PWS, OHOH090201215,600Surface water purchased1Below all study benchmarks
MONROE WATER SYSTEMSOH56008124,334Ground water1Below all study benchmarks
MONTGOMERY COUNTY WATER SERVICES 1 PWSOH5701315150,207Surface water purchased1At or above a study benchmark
MONTGOMERY COUNTY WATER SERVICES 2 PWSOH570150383,033Surface water purchased1Below all study benchmarks
MONTPELIER VILLAGEOH86009124,280Ground water1Below all study benchmarks
MOUNT ORAB VILLAGE PWSOH08010116,607Surface water1Below all study benchmarks
MOUNT VERNON CITY PWSOH420081216,990Ground water1Below all study benchmarks
MT GILEAD VILLAGE PWSOH59007123,503Ground water1Below all study benchmarks
MUNROE FALLS CITY PWSOH77027035,042Ground water purchased1Below all study benchmarks
MUSKINGUM COUNTY WATER - SEOH600041221,540Ground water1Below all study benchmarks
NAPOLEON CITYOH35008118,858Surface water1Below all study benchmarks
NAWAOH555361229,974Ground water1Below all study benchmarks
NELSONVILLE PWSOH05012146,656Ground water1Below all study benchmarks
NEW BREMEN VILLAGEOH06005123,034Ground water1Below all study benchmarks
NEW CARLISLE CITY PWSOH12033125,800Ground water1Below all study benchmarks
NEW LEBANON VILLAGE PWSOH57018123,770Ground water1Below all study benchmarks
NEW LEXINGTONOH64004115,161Surface water1Below all study benchmarks
NEW MIAMI VILLAGE PWSOH09021123,200Ground water1Below all study benchmarks
NEW PHILADELPHIA CITY PWSOH790081217,410Ground water1Below all study benchmarks
NEWARK CITY PWSOH450231449,934Surface water1Below all study benchmarks
NEWCOMERSTOWN VILLAGE PWSOH79009123,882Ground water1Below all study benchmarks
NEWTON FALLS CITYOH78023116,109Surface water1At or above a study benchmark
NORTH CANTON CITY PWSOH760431224,747Ground water1Below all study benchmarks
NORTH RIDGEVILLE CITY PWSOH470080329,465Surface water purchased2Below all study benchmarks
NORTHERN OHIO RURAL WATEROH390240318,224Surface water purchased4Below all study benchmarks
NORTHERN OHIO RURAL WATER - NW DISTRICTOH22018036,409Surface water purchased1Below all study benchmarks
NORTHWEST REGIONAL WATER DISTRICTOH730000311,059Ground water purchased1Below all study benchmarks
NORTHWESTERN W AND SD - WTLN 200OH87042039,629Surface water purchased1Below all study benchmarks
NORTHWESTERN W AND SD -TOLEDO SVCE AREAOH875281219,758Surface water purchased1Below all study benchmarks
NORTHWESTERN W AND SD- PORTAGEOH87041034,776Surface water purchased1Below all study benchmarks
NORW - SOUTH DISTRICTOH39467125,226Surface water purchased1Below all study benchmarks
NORWALK CITYOH390111117,466Surface water1Below all study benchmarks
NORWOOD CITY PWSOH310170319,870Surface water purchased1Below all study benchmarks
OAK HARBOR VILLAGEOH62026034,400Surface water purchased1Below all study benchmarks
OAKDALE WATER DISTRICTOH6402403250Ground water purchased1Below all study benchmarks
OAKWOOD CITY PWSOH57019159,572Ground water2Below all study benchmarks
OBERLIN WATER DEPARTMENTOH47009118,600Surface water1Below all study benchmarks
ODRC-PICKAWAY CORRECTION PWSOH65017123,376Ground water1Below all study benchmarks
ONTARIO CITYOH70035126,756Ground water1Below all study benchmarks
OREGON CITY, OHOH480091119,950Surface water1Below all study benchmarks
ORRVILLE CITY PWSOH85027128,452Ground water1Below all study benchmarks
OTTAWA COUNTY REGIONAL WATER DISTRICTOH620501120,428Surface water1Below all study benchmarks
OTTAWA VILLAGEOH69007114,393Surface water1Below all study benchmarks
OXFORD CITY PWSOH090231224,000Ground water1Below all study benchmarks
PAINESVILLE CITY PWSOH430161131,728Surface water1Below all study benchmarks
PATASKALA CITYOH45025129,900Ground water2Below all study benchmarks
PAULDING VILLAGEOH63004113,605Surface water1Below all study benchmarks
PERRYSBURG CITY WATEROH870180327,000Surface water purchased1Below all study benchmarks
PICKERINGTON CITY PWSOH230151219,141Ground water1Below all study benchmarks
PIKE WATER, INC.-PLANT PWSOH660241215,487Ground water1Below all study benchmarks
PIQUA CITY PWSOH550121120,354Surface water1Below all study benchmarks
PORT CLINTON CITYOH62032116,500Surface water purchased1Below all study benchmarks
PORTAGE COUNTY WATER RESOURCESOH67028128,606Ground water2Below all study benchmarks
PORTSMOUTH PUBLIC WATER SYSTEMOH730011140,475Surface water1Below all study benchmarks
PUTNAM COMMUNITY WATER ASSOCIATION PWSOH84007122,744Ground water1At or above a study benchmark
RAVENNA CITY PWSOH670321116,000Surface water1Below all study benchmarks
READING CITY PWSOH31018129,506Surface water purchased1Below all study benchmarks
REYNOLDSBURG CITY PWSOH250320337,847Surface water purchased2Below all study benchmarks
RITTMAN CITY PWSOH85030126,491Ground water2Below all study benchmarks
ROSS COUNTY WATER CO INC PWSOH710141235,345Ground water2Below all study benchmarks
RURAL LORAIN CO. WATER AOH470180373,125Surface water purchased3Below all study benchmarks
SALEM CITY, OHOH150201116,850Surface water1Below all study benchmarks
SANDUSKY CITYOH220141125,793Surface water1Below all study benchmarks
SANITARY DISTRICT #4OH25010038,575Surface water purchased1Below all study benchmarks
SCIOTO CO. REGIONAL WATER DISTRICT #1OH730021213,820Ground water1Below all study benchmarks
SCIOTO WATER, INC.-ROSE HILLOH73003038,861Ground water1Below all study benchmarks
SCRANTON WOODSOH2803712114Ground water1Below all study benchmarks
SHADYSIDE PUBLIC WATER SYSTEMOH07016123,689Ground water1At or above a study benchmark
SHEFFIELD LAKE CITY PWSOH47011039,108Surface water purchased1Below all study benchmarks
SHELBY CITYOH70045119,453Surface water1Below all study benchmarks
SIDNEY CITY PWSOH750121420,614Surface water1Below all study benchmarks
SOUTH LEBANON VILLAGE PWSOH83013123,891Surface water purchased1Below all study benchmarks
SOUTH POINT VILLAGEOH44012124,133Ground water1Below all study benchmarks
SOUTHERN PERRY CO-CONGOOH64016034,029Ground water purchased1Below all study benchmarks
SOUTHWEST LICKING COMMUNITY WATEROH450541217,818Ground water1Below all study benchmarks
SOUTHWEST REGIONAL WATER DISTRICTOH090391242,856Ground water2Below all study benchmarks
SPRINGBORO PWSOH830141219,263Ground water1At or above a study benchmark
SPRINGFIELD CITY PWSOH120441260,680Ground water1Below all study benchmarks
ST MARYS CITYOH06006129,356Ground water1Below all study benchmarks
ST. CLAIRSVILLE, CITY OF PWSOH07015165,097Surface water1At or above a study benchmark
STARK COUNTY WATER DISTRICTOH76073036,690Ground water purchased1Below all study benchmarks
STEUBENVILLE, CITY OFOH410241117,000Surface water1Below all study benchmarks
STOW PUBLIC WATER SYSTEMOH770450335,437Surface water purchased1Below all study benchmarks
STREETSBORO CITY PWSOH670500315,105Ground water purchased1Below all study benchmarks
SWANTON VILLAGEOH26010113,855Surface water1Below all study benchmarks
SYLVANIA CITYOH480130321,618Surface water purchased1Below all study benchmarks
TALLMADGE CITY PWSOH770470318,394Surface water purchased1Below all study benchmarks
TATE-MONROE WATER ASSOCIATION PWSOH130131224,092Ground water2Below all study benchmarks
TCMSD-WILKSHIRE HILLS PWSOH79016126,587Ground water1Below all study benchmarks
TIMBERLAKE WATER SYSTEMOH25018121,600Ground water1Below all study benchmarks
TOLEDO, CITY OFOH4801411360,000Surface water1Below all study benchmarks
TORONTO PWSOH41028115,676Surface water1Below all study benchmarks
TRENTON CITY PWSOH090301213,012Ground water1Below all study benchmarks
TROTWOOD CITY PWSOH57024039,000Surface water purchased1Below all study benchmarks
TROY CITY PWS, OHOH550161226,305Ground water1Below all study benchmarks
TRUMBULL CO. - BAZETTA/CHAMPIONOH78043038,270Surface water purchased1Below all study benchmarks
TRUMBULL CO.-HOWLAND TWP PWSOH78063036,396Surface water purchased1At or above a study benchmark
TRUMBULL CO.-SOUTHEAST PWSOH78032039,931Surface water purchased1At or above a study benchmark
TUPPER PLAINS/CHESTER WATER DISTRICTOH530061216,087Ground water1Below all study benchmarks
TWIN CITY WATER AND SEWER DISTRICT PWSOH79017119,224Ground water1Below all study benchmarks
UNION CITY PWSOH57025127,000Ground water2Below all study benchmarks
URBANA CITY PWSOH110121211,428Ground water2Below all study benchmarks
VAN WERT CITYOH810061110,846Surface water1Below all study benchmarks
VERMILION CITYOH220151110,594Surface water1Below all study benchmarks
WADSWORTH CITY PWSOH520171224,356Ground water1Below all study benchmarks
WAPAKONETA CITYOH060071211,000Ground water1Below all study benchmarks
WARREN CITY PWSOH780381149,130Surface water1Below all study benchmarks
WARREN CO. RICHARD RENNEKER PWSOH830151281,975Ground water1Below all study benchmarks
WARREN CO. SOCIALVILLE PWSOH830420313,216Surface water purchased1Below all study benchmarks
WARREN COMM W AND S ASSN 2OH84027037,215Ground water1At or above a study benchmark
WASHINGTON COURT HOUSE PWSOH240071414,100Surface water1Below all study benchmarks
WATERFORD WATER/SEWER ASSOCIATIONOH8401112770Ground water1Below all study benchmarks
WATERVILLE CITYOH48015036,500Surface water purchased1Below all study benchmarks
WAVERLY CITY PWSOH66009124,433Ground water1Below all study benchmarks
WAYNESVILLE VILLAGE PWSOH83020124,100Ground water1Below all study benchmarks
WAYNOKA REGIONAL WATER AND SEWER DISTOH08008112,428Surface water3Below all study benchmarks
WELLINGTON VILLAGE PWSOH47015114,802Surface water1Below all study benchmarks
WELLSTON CITY PWSOH40019125,846Surface water2Below all study benchmarks
WEST CARROLLTON CITY PWSOH57028128,361Ground water1Below all study benchmarks
WEST JEFFERSON VILLAGE PWSOH49020124,488Ground water1Below all study benchmarks
WEST MILTON VILLAGE PWSOH55017114,890Ground water purchased1Below all study benchmarks
WESTERN WATER COMPANYOH830051239,508Surface water purchased2At or above a study benchmark
WESTERVILLE CITY PWSOH250341139,000Surface water1Below all study benchmarks
WHITEHOUSE VILLAGEOH48016125,200Surface water purchased2Below all study benchmarks
WILLARD CITYOH39015117,099Surface water1Below all study benchmarks
WILMINGTON CITY PWSOH140121112,401Surface water1Below all study benchmarks
WOOSTER CITY PWSOH850451226,618Ground water1Below all study benchmarks
WRIGHT STATE UNIVERSITYOH29020128,948Ground water1Below all study benchmarks
WRIGHT-PATTERSON AFB AREA A PWSOH290341216,551Ground water4At or above a study benchmark
WRIGHT-PATTERSON AFB AREA B PWSOH290331211,034Ground water2At or above a study benchmark
XENIA CITY PWSOH290281229,000Ground water1Below all study benchmarks
YELLOW SPRINGS VILLAGE PWSOH29030123,761Ground water1At or above a study benchmark
ZANESVILLE PWSOH600271229,381Ground water1Below all study benchmarks
How the count works

What is included

Each active community water system with enough required samples for a yearly average is counted once, even if it is linked with several ZIP codes. This does not mean every home was tested. Private wells are excluded, and UCMR 5 did not comprehensively monitor every small system. This page does not apply Ohio's state-specific standards or determine compliance. Use the official state or territory drinking-water program for current regulatory information.

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Related links

PFAS Estimator system lookupNational state comparison tableFull methodology and limitationsCurrent EPA UCMR 5 Data FinderOfficial state and territory drinking-water programs