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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
NEORSD Southerly WWTPLockbourne525 MGD (million gallons per day)2022
NEORSD Easterly WWTPCleveland355 MGD (million gallons per day)2022
MSD Mill Creek Drainage BasinCincinnati220.9 MGD (million gallons per day)2022
Columbus Southerly WWTP & SewersLockbourne111.879 MGD (million gallons per day)2022
Toledo Bay View Park WWTP & SewersToledo102 MGD (million gallons per day)2022
Akron WWTP & SewersAkron90 MGD (million gallons per day)2022
MSD Little Miami Drainage BasinCincinnati73.6 MGD (million gallons per day)2022
Columbus Jackson Pike WWTP & SewersColumbus72 MGD (million gallons per day)2022
Dayton WWTP & Sewer SystemDayton72 MGD (million gallons per day)2022
Hamilton WRF & Sewer SystemHamilton48.208 MGD (million gallons per day)2022
NEORSD Westerly WWTPCleveland40 MGD (million gallons per day)2022
Canton WWTP & Sewer SystemCanton39 MGD (million gallons per day)2022
Youngstown WWTP & Sewer SystemYoungstown35 MGD (million gallons per day)2022
Lakewood WWTP & Sewer SystemLakewood31 MGD (million gallons per day)2022
Middletown WWTP & Sewer SystemMiddletown26 MGD (million gallons per day)2022
Montgomery Co Western Regional WWTP & SewersDayton25 MGD (million gallons per day)2022
Springfield WWTP & Sewer SystemSpringfield25 MGD (million gallons per day)2022
Lucas Co Water Resource Recovery FacilityWaterville22.5 MGD (million gallons per day)2022
MSD Muddy Creek Drainage BasinCincinnati22.3 MGD (million gallons per day)2022
Euclid WWTP & Sewer SystemEuclid22 MGD (million gallons per day)2022
Rocky River WWTP & Sewer SystemRocky River22 MGD (million gallons per day)2022
Sandusky WWTP & Sewer SystemSandusky22 MGD (million gallons per day)2022
Gary L Kron WRF & Sewer SystemMentor20 MGD (million gallons per day)2022
Lima WWTP & Sewer SystemLima18.5 MGD (million gallons per day)2022
Massillon WWTP & Sewer SystemMassillon17 MGD (million gallons per day)2022
Butler Co Upper Mill Creek WWTPWest Chester16 MGD (million gallons per day)2022
Warren WWTP & Sewer SystemWarren16 MGD (million gallons per day)2022
Ashtabula WWTP & Sewer SystemAshtabula15.52 MGD (million gallons per day)2022
Butler Co LeSourdsville WWTPHamilton15 MGD (million gallons per day)2022
Findlay WWTP & Sewer SystemFindlay15 MGD (million gallons per day)2022
Lorain Black River WWTPLorain15 MGD (million gallons per day)2022
Sewer District #500 (Liverpool)Valley City15 MGD (million gallons per day)2022
Miamisburg WWTP & Sewer SystemMiamisburg14.5 MGD (million gallons per day)2022
MSD Sycamore Creek Drainage BasinCincinnati14.01 MGD (million gallons per day)2022
Elyria WWTP & Sewer SystemElyria13 MGD (million gallons per day)2022
Montgomery Co Eastern Regional WWTP and SewersDayton13 MGD (million gallons per day)2022
Fostoria WWTP & Sewer SystemFostoria12.7 MGD (million gallons per day)2022
Mansfield WWTP & Sewer SystemMansfield12 MGD (million gallons per day)2022
Warren Co Lower Little Miami WWTPMaineville12 MGD (million gallons per day)2022
MSD Polk Run Drainage BasinLoveland11.58 MGD (million gallons per day)2022
North Ridgeville French Creek WWTPNorth Ridgeville11.25 MGD (million gallons per day)2022
Tri-Cities North Regional WWTPDayton11.2 MGD (million gallons per day)2022
Zanesville WWTP & Sewer SystemZanesville11 MGD (million gallons per day)2022
Marion WWTP & Sewer SystemMarion10.5 MGD (million gallons per day)2022
Delaware Co Alum Creek WWTPLewis Center10 MGD (million gallons per day)2022
Delaware WWTP & Sewer SystemDelaware10 MGD (million gallons per day)2022
Fairfield WWTP & Sewer SystemFairfield10 MGD (million gallons per day)2022
Lancaster Lawrence St WWTPLancaster10 MGD (million gallons per day)2022
Bowling Green WWTP & Sewer SystemBowling Green10 MGD (million gallons per day)2022
Greene Co Sugarcreek WWTP and SewersSpring Valley9.9 MGD (million gallons per day)2022
Willoughby Eastlake WWTP & SewersEastlake9.5 MGD (million gallons per day)2022
Clermont Co Lower East Fork WWTPMilford9 MGD (million gallons per day)2022
Greene Co Beavercreek WWTP & SewersDayton8.5 MGD (million gallons per day)2022
Marysville WRF & Sewer SystemMarysville8 MGD (million gallons per day)2022
Newark WWTP & Sewer SystemNewark8 MGD (million gallons per day)2022
Oregon WWTP & Sewer SystemOregon8 MGD (million gallons per day)2022
Perrysburg WWTP & Sewer SystemPerrysburg8 MGD (million gallons per day)2022
Summit Co Fishcreek WWTP #25Stow8 MGD (million gallons per day)2022
Fremont WPCC & Sewer SystemFremont7.6 MGD (million gallons per day)2022
Alliance WWTP & SewersAlliance7.5 MGD (million gallons per day)2022
Wooster WWTP & Sewer SystemWooster7.5 MGD (million gallons per day)2022
Clermont Co Middle East Fork WWTPBatavia7.2 MGD (million gallons per day)2022
Troy WWTP & Sewer SystemTroy7.002 MGD (million gallons per day)2022
North Olmsted WWTP & Sewer SystemNorth Olmsted7 MGD (million gallons per day)2022
Sidney WWTP & Sewer SystemSidney7 MGD (million gallons per day)2022
MSD Taylor Creek Drainage BasinCleves6.8 MGD (million gallons per day)2022
Avon Lake WPCF & SewersAvon Lake6.5 MGD (million gallons per day)2022
Portsmouth Lawson Run WWTP & SewersPortsmouth6.5 MGD (million gallons per day)2022
Barberton WWTP & Sewer SystemBarberton6.3 MGD (million gallons per day)2022
Niles WWTP & Sewer SystemNiles6.22 MGD (million gallons per day)2022
Twinsburg WWTP & Sewer SystemTwinsburg6.071 MGD (million gallons per day)2022
Defiance WWTP & Sewer SystemDefiance6 MGD (million gallons per day)2022
Delaware Co Olentangy ECCPowell6 MGD (million gallons per day)2022
Fairborn WWTP & Sewer SystemFairborn6 MGD (million gallons per day)2022
Lebanon Regional WWTP & SewersLebanon6 MGD (million gallons per day)2022
Painesville WWTP & Sewer SystemPainesville6 MGD (million gallons per day)2022
Steubenville WWTP & Sewer SystemSteubenville6 MGD (million gallons per day)2022
Struthers WWTP & Sewer SystemStruthers6 MGD (million gallons per day)2022
Washington CH WWTP & SewersWashington Court House6 MGD (million gallons per day)2022
London WWTP & Sewer SystemLondon5.8 MGD (million gallons per day)2022
Solon Central WWTP & Sewer SystemSolon5.8 MGD (million gallons per day)2022
Lorain Philip Q Maiorana WWTPLorain5.4 MGD (million gallons per day)2022
Portage Co Streetsboro-Hudson Regional WWTPStreetsboro5.236 MGD (million gallons per day)2022
Ashland WWTP & Sewer SystemAshland5 MGD (million gallons per day)2022
Eastern Ohio Regional WW AuthorityBellaire5 MGD (million gallons per day)2022
Girard WWTP & Sewer SystemGirard5 MGD (million gallons per day)2022
Kent WWTP & Sewer SystemKent5 MGD (million gallons per day)2022
Lake Co Madison No. 1 WWTPMadison5 MGD (million gallons per day)2022
Mahoning Co Boardman WWTPYoungstown5 MGD (million gallons per day)2022
Mount Vernon WWTP & Sewer SystemMount Vernon5 MGD (million gallons per day)2022
Wadsworth WWTP & Sewer SystemWadsworth5 MGD (million gallons per day)2022
Mason WWTP & Sewer SystemMason4.95 MGD (million gallons per day)2022
Athens WWTP & Sewer SystemAthens4.8 MGD (million gallons per day)2022
Logan Co Indian Lake SSD WWTPRussells Point4.6 MGD (million gallons per day)2022
Franklin Regional WWTPFranklin4.5 MGD (million gallons per day)2022
New Philadelphia WWTP & SewersNew Philadelphia4.5 MGD (million gallons per day)2022
Piqua WWTP & Sewer SystemPiqua4.5 MGD (million gallons per day)2022
Urbana WWTP & Sewer SystemUrbana4.5 MGD (million gallons per day)2022
Willard WWTP & Sewer SystemWillard4.5 MGD (million gallons per day)2022
Clermont Co O'Bannon Creek WWTPLoveland4.4 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.