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World wastewater treatment plant observatory · data as reported by each inventory

Wastewater treatment plants in United States · Ohio

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808 inventory records · EPA Clean Watersheds Needs Survey 2022

Data years: 2022. The inventory date does not establish current operation.

808 results

CompareNameNative sizeYear
Wellston North WWTP & Sewer SystemWellston1.44 MGD (million gallons per day)2022
Delaware Co Lower Scioto WRFDelaware1.4 MGD (million gallons per day)2022
East Palestine WWTP & Sewer SystemEast Palestine1.4 MGD (million gallons per day)2022
Millersburg WWTP & Sewer SystemMillersburg1.4 MGD (million gallons per day)2022
West Carrollton WWTP & Sewer SystemCarrollton1.4 MGD (million gallons per day)2022
Ottawa Co Portage/Catawba WWTPPort Clinton1.34 MGD (million gallons per day)2022
Barnesville WWTP & Sewer SystemBarnesville1.3 MGD (million gallons per day)2022
Trumbull Co Brookfield SD 1 & 2Masury1.3 MGD (million gallons per day)2022
Ada WWTP & Sewer SystemAda1.29 MGD (million gallons per day)2022
Newcomerstown WWTP & SewersNewcomerstown1.25 MGD (million gallons per day)2022
Allen Co American #2 WWTPLima1.2 MGD (million gallons per day)2022
Brookville WWTP & Sewer SystemBrookville1.2 MGD (million gallons per day)2022
Erie Co Sawmill Creek WWTPHuron1.2 MGD (million gallons per day)2022
Johnstown WWTP & Sewer SystemJohnstown1.2 MGD (million gallons per day)2022
Milford WWTP & Sewer SystemMilford1.2 MGD (million gallons per day)2022
Scioto Co Wheelersburg Sewer District No. 2 WWTP & SewersWheelersburg1.2 MGD (million gallons per day)2022
West Jefferson WWTP & Sewer SystemWest Jefferson1.2 MGD (million gallons per day)2022
West Milton WWTP & Sewer SystemWest Milton1.2 MGD (million gallons per day)2022
Columbiana Co Elkton Regional WWTPLisbon1.14 MGD (million gallons per day)2022
Sunbury WWTP & Collection SystemSunbury1.125 MGD (million gallons per day)2022
Leipsic WWTP & Sewer SystemLeipsic1.1 MGD (million gallons per day)2022
Pataskala WWTP & Sewer SystemPataskala1.1 MGD (million gallons per day)2022
Baltimore WWTP & Sewer SystemBaltimore1.01 MGD (million gallons per day)2022
Wellsville WWTP & Sewer SystemWellsville1 MGD (million gallons per day)2022
Montpelier WWTP & Sewer SystemMontpelier1 MGD (million gallons per day)2022
Byesville John R. Smalley WWTP & Sewer SystemByesville1 MGD (million gallons per day)2022
Chagrin Falls WWTP & Sewer SystemChagrin Falls1 MGD (million gallons per day)2022
Mahoning Co Craig Beach WWTPLake Milton1 MGD (million gallons per day)2022
Middlefield WWTP & Sewer SystemMiddlefield1 MGD (million gallons per day)2022
Navarre WWTP & Sewer SystemNavarre1 MGD (million gallons per day)2022
New Carlisle WWTP & Sewer SystemNew Carlisle1 MGD (million gallons per day)2022
North Royalton WW District BNorth Royalton1 MGD (million gallons per day)2022
Toronto WWTP & Sewer SystemToronto1 MGD (million gallons per day)2022
Union WWTP & Sewer SystemEnglewood1 MGD (million gallons per day)2022
Jefferson WWTP & Sewer SystemJefferson0.995 MGD (million gallons per day)2022
Blanchester WWTP & Sewer SystemBlanchester0.99 MGD (million gallons per day)2022
Pitsburg WWTP & SewersPitsburg0.95 MGD (million gallons per day)2022
Hicksville WWTP & Sewer SystemHicksville0.95 MGD (million gallons per day)2022
Crestline WWTP & Sewer SystemCrestline0.95 MGD (million gallons per day)2022
Saint Clairsville North WWTPSaint Clairsville0.95 MGD (million gallons per day)2022
Minerva WWTP & Sewer SystemMinerva0.93 MGD (million gallons per day)2022
Oak Harbor WWTP & Sewer SystemOak Harbor0.93 MGD (million gallons per day)2022
Swanton WWTP & Sewer SystemSwanton0.92 MGD (million gallons per day)2022
Granville WWTP & Sewer SystemGranville0.911 MGD (million gallons per day)2022
Carey WWTP & Sewer SystemCarey0.91 MGD (million gallons per day)2022
Pleasant Valley RSD WWTP & SewersChillicothe0.9 MGD (million gallons per day)2022
Coldwater WWTP & Sewer SystemColdwater0.9 MGD (million gallons per day)2022
Knox Co Little Jelloway Creek WWTPMount Vernon0.9 MGD (million gallons per day)2022
Jamestown WWTP & Sewer SystemJamestown0.9 MGD (million gallons per day)2022
New Bremen WWTP & Sewer SystemNew Bremen0.9 MGD (million gallons per day)2022
Sewer District #700 (Chippewa)Chippewa Lake0.874 MGD (million gallons per day)2022
New Lexington WWTP & Sewer SystemNew Lexington0.87 MGD (million gallons per day)2022
Saint Henry WWTP & Sewer SystemSaint Henry0.867 MGD (million gallons per day)2022
Mount Gilead WWTP & Sewer SystemMount Gilead0.82 MGD (million gallons per day)2022
Columbus Grove WWTP & Sewer SystemColumbus Grove0.82 MGD (million gallons per day)2022
Caldwell WWTP & Sewer SystemCaldwell0.8 MGD (million gallons per day)2022
Fairfield Co Sycamore Creek WRFPickerington0.8 MGD (million gallons per day)2022
Cridersville WWTP & Sewer SystemWapakoneta0.8 MGD (million gallons per day)2022
Georgetown WWTP & Sewer SystemGeorgetown0.8 MGD (million gallons per day)2022
Lodi WWTP & Sewer SystemLodi0.8 MGD (million gallons per day)2022
Brown Twp/Malvern Sewer DistrictMalvern0.8 MGD (million gallons per day)2022
New Lebanon WWTP & Sewer SystemNew Lebanon0.8 MGD (million gallons per day)2022
Butler Co New Miami WWTPHamilton0.8 MGD (million gallons per day)2022
North Baltimore WWTP & Sewer SystemNorth Baltimore0.8 MGD (million gallons per day)2022
West Union WWTP & Sewer SystemWest Union0.78 MGD (million gallons per day)2022
Tuscarawas Co Wilkshire Hills WWTPBolivar0.75 MGD (million gallons per day)2022
Versailles WWTP & Sewer SystemVersailles0.75 MGD (million gallons per day)2022
Belmont Co Fox Shannon WWTPSaint Clairsville0.75 MGD (million gallons per day)2022
Covington WWTP & Sewer SystemCovington0.75 MGD (million gallons per day)2022
Glendale WWTP & Sewer SystemCincinnati0.75 MGD (million gallons per day)2022
Fairfield Co Little Walnut SycamoreLancaster0.75 MGD (million gallons per day)2022
Plain City WWTP & Sewer SystemPlain City0.75 MGD (million gallons per day)2022
Wellington WWTP & Sewer SystemWellington0.75 MGD (million gallons per day)2022
Delta WWTP & Sewer SystemDelta0.725 MGD (million gallons per day)2022
Paulding WWTP & Sewer SystemPaulding0.71 MGD (million gallons per day)2022
Waynesville WWTP & Sewer SystemWaynesville0.71 MGD (million gallons per day)2022
Mount Orab WWTP & Sewer SystemMount Orab0.7 MGD (million gallons per day)2022
Roseville WWTP & Sewer SystemRoseville0.671 MGD (million gallons per day)2022
Brewster WWTP & Sewer SystemBrewster0.665 MGD (million gallons per day)2022
Atwood Regional WSDMineral City0.65 MGD (million gallons per day)2022
Westfield Center WWTP & SewersWestfield Center0.635 MGD (million gallons per day)2022
Geneva-on-the-Lake WWTP & SewersGeneva0.6 MGD (million gallons per day)2022
Ashville WWTP & Sewer SystemAshville0.6 MGD (million gallons per day)2022
Loudonville WWTP & Sewer SystemLoudonville0.6 MGD (million gallons per day)2022
The Plains WWTP & SewersThe Plains0.6 MGD (million gallons per day)2022
New London WWTP & Sewer SystemNew London0.6 MGD (million gallons per day)2022
Butler Co Queen Acres WRFHamilton0.6 MGD (million gallons per day)2022
Cadiz WWTP & Sewer SystemCadiz0.6 MGD (million gallons per day)2022
Genoa WWTP & Sewer SystemGenoa0.6 MGD (million gallons per day)2022
Hartville WWTP & Sewer SystemHartville0.6 MGD (million gallons per day)2022
Mingo Junction WWTP & Sewer SystemMingo Junction0.6 MGD (million gallons per day)2022
Portsmouth Sciotoville WWTP & Sewer SystemPortsmouth0.6 MGD (million gallons per day)2022
Lakengren WWTP & Sewer SystemEaton0.6 MGD (million gallons per day)2022
Lucasville WWTP and collection systemLucasville0.6 MGD (million gallons per day)2022
Shadyside WWTP & Sewer SystemShadyside0.6 MGD (million gallons per day)2022
Yellow Springs WWTP & Sewer SystemYellow Springs0.6 MGD (million gallons per day)2022
Portage Co Twin Lakes WWTPKent0.579 MGD (million gallons per day)2022
Greene Co Cedarville WWTP and SewersDayton0.56 MGD (million gallons per day)2022
Carrollton WWTP & Sewer SystemCarrollton0.55 MGD (million gallons per day)2022
Mahoning Co New Middletown WWTPNew Middletown0.55 MGD (million gallons per day)2022

Regulatory context

General reference. This is not an exhaustive review of applicable law.

United States: Clean Water Act / NPDES

NPDES regulates pollutant discharges from point sources to waters of the United States. The permit sets limits and monitoring conditions. A CWNS code identifies an inventory record, not an NPDES permit.

  • Permit identifier and permitting authority: EPA or an authorized state.
  • Outfall and receiving water; sewer connections follow a different control route.
  • Current permit conditions, limits and dated measurements; these are not included in CWNS.

References reviewed: 2026-11-06. Individual applicability: undetermined. This profile does not establish authorization or compliance.