| Crestline WWTP | Crestline | 0.81 |
| American-Bath WWTP | Lima | 0.8 |
| Columbiana WWTP | Columbiana | 0.8 |
| Chagrin Falls Meadow Lane WWTP | Chagrin Falls | 0.8 |
| Nelsonville WWTP | Nelsonville | 0.79 |
| Oak Harbor WWTP | Oak Harbor | 0.79 |
| Sunbury WWTP | Sunbury | 0.78 |
| Strongsville Cwwtp & Sewers | Strongsville | 0.77 |
| Plain City WWTP | Plain City | 0.76 |
| Geneva WWTP | Geneva | 0.76 |
| Chickasaw WWTP | Chickasaw | 0.76 |
| Larue WWTP | Larue | 0.75 |
| Grafton WWTP | Grafton | 0.75 |
| Indian Creek WWTP | North Bend | 0.75 |
| Aurora Central WWTP | Aurora | 0.74 |
| Strongsville B WWTP | Strongsville | 0.74 |
| Union Rome Twps Sub-Sd WWTP | Chesapeake | 0.72 |
| Rittman WWTP | Rittman | 0.71 |
| New London WWTP | New London | 0.7 |
| Belpre WWTP | Belpre | 0.69 |
| Navarre WWTP | Navarre | 0.68 |
| American No 2 WWTP | Elida | 0.67 |
| Attica STP | Attica | 0.66 |
| Aqua Ohio Water Co Inc - Huber Ridge WWTP | Westerville | 0.65 |
| Mcclure WTP | Mcclure | 0.65 |
| Blanchester WWTP | Blanchester | 0.64 |
| West Milton WWTP | West Milton | 0.64 |
| Middlefield WWTP | Middlefield | 0.64 |
| Little Jelloway Creek WWTP | Mount Vernon | 0.63 |
| Metamora WWTP | Metamora | 0.63 |
| New Lexington WWTP | New Lexington | 0.63 |
| Milford City WWTP | Milford | 0.63 |
| Montpelier WWTP | Montpelier | 0.62 |
| Lucasville WWTP | Lucasville | 0.62 |
| Savannah WWTP | Savannah | 0.6 |
| Portage Catawba Island WWTP | Port Clinton | 0.6 |
| Sebring WWTP | Sebring | 0.6 |
| Georgetown WWTP | Georgetown | 0.6 |
| Mt Orab WWTP | Mount Orab | 0.59 |
| Pleasant Valley Regional Sd | Chillicothe | 0.59 |
| East Palestine WWTP | East Palestine | 0.59 |
| Lexington WWTP | Lexington | 0.58 |
| Millersburg WWTP | Millersburg | 0.58 |
| Paulding WWTP | Paulding | 0.58 |
| Heatherstone WWTP | Painesville | 0.58 |
| Elkton WWTP | Lisbon | 0.57 |
| Hicksville WWTP | Hicksville | 0.57 |
| Saint Henry WWTP | St Henry | 0.57 |
| New Bremen WWTP | New Bremen | 0.56 |
| Carey WWTP | Carey | 0.56 |
| Waynesville Regional WWTP | Waynesville | 0.56 |
| Wellsville WWTP | Wellsville | 0.55 |
| Johnstown WWTP | Johnstown | 0.54 |
| Caldwell WWTP | Caldwell | 0.53 |
| Ada WWTP | Ada | 0.52 |
| Bluffton WWTP | Bluffton | 0.5 |
| Chardon WWTP | Chardon | 0.49 |
| Jamestown STP | Jamestown | 0.49 |
| Minerva STP | Minerva | 0.49 |
| Brewster Village Pws | Brewster | 0.48 |
| Wellington WWTP | Wellington | 0.48 |
| Cedarville WWTP | Cedarville | 0.47 |
| North Royalton WWTP B | North Royalton | 0.47 |
| New Carlisle WWTP | New Carlisle | 0.46 |
| Versailles Village Of | Versailles | 0.45 |
| Deshler WWTP | Deshler | 0.45 |
| Williamsburg Village Pws | Williamsburg | 0.45 |
| Canal Fulton Regional WWTP | Canal Fulton | 0.44 |
| New Lebanon STP | New Lebanon | 0.44 |
| Mt Gilead WWTP | Mount Gilead | 0.44 |
| St Clairsville WWTP | St Clairsville | 0.43 |
| Barnesville WWTP | Barnesville | 0.42 |
| West Union WWTP | West Union | 0.42 |
| Commercial Point WWTP | Commercial Point | 0.41 |
| Mingo Junction STP | Mingo Junction | 0.41 |
| Glendale WWTP | Glendale | 0.41 |
| Jefferson WWTP | Jefferson | 0.41 |
| Baltimore WWTP | Baltimore | 0.41 |
| Wintersville A WWTP | Wintersville | 0.4 |
| Gibsonburg WWTP | Gibsonburg | 0.4 |
| Continental WWTP | Continental | 0.4 |
| Lowellville WWTP | Lowellville | 0.4 |
| Granville WWTP | Granville | 0.4 |
| Yellow Springs WWTP | Yellow Springs | 0.4 |
| Fayetteville Perry Twp WWTP | Fayetteville | 0.4 |
| Mount Sterling WWTP | Mount Sterling | 0.39 |
| New Middletown - Springfield Twp WWTP | New Middletown | 0.38 |
| Carrollton WWTP | Carrollton | 0.38 |
| Fox-Shannon WWTP | St Clairsville | 0.38 |
| Swanton WRRF | Swanton | 0.38 |
| Elida WWTP | Elida | 0.37 |
| Delta WWTP | Delta | 0.37 |
| Cadiz WWTP | Cadiz | 0.37 |
| Roseville WWTP | Roseville | 0.36 |
| Lagrange WPCP | Lagrange | 0.35 |
| Atwood Regional W & Sd | Dellroy | 0.34 |
| Covington WWTP | Covington | 0.34 |
| Wilkshire Hills WWTP | Bolivar | 0.34 |
| Sabina WWTP | Sabina | 0.34 |
| Greenwich WWTP | Greenwich | 0.33 |
| Utica WWTP | Utica | 0.33 |
| Shadyside WWTP & Sewer System | Shadyside | 0.33 |
| Richwood WWTP | Richwood | 0.33 |
| Springwood Lake Camp Club WWTP | Navarre | 0.32 |
| Medina County Comm Sd 700 | Seville | 0.32 |
| Rattlesnake Sd #1 WWTP | Jeffersonville | 0.32 |
| Lake Loramie Special Sanitary Sd | Minster | 0.32 |
| Dalton WWTP | Dalton | 0.31 |
| Loudonville WWTP | Loudonville | 0.31 |
| Queen Acres Water Reclamation Facility | Hamilton | 0.31 |
| Strasburg WWTP | Strasburg | 0.31 |
| Beaverdam WWTP | Beaverdam | 0.31 |
| Jefferson Co - M WWTP | Wintersville | 0.3 |
| Shreve WWTP | Shreve | 0.3 |
| Sandyville-East Sparta WWTP | New Philadelphia | 0.29 |
| Seville WWTP | Seville | 0.29 |
| New Knoxville STP | New Knoxville | 0.29 |
| Pioneer Village-Pioneer Village | Pioneer | 0.28 |
| Hartville WWTP | Hartville | 0.28 |
| Butler WWTP | Butler | 0.28 |
| West Unity STP | West Unity | 0.28 |
| Woodsfield STP | Woodsfield | 0.27 |
| Berlin Village WWTP | Berlin | 0.27 |
| Lyons STP | Lyons | 0.27 |
| Mt Victory WWTP | Mount Victory | 0.27 |
| Spencerville WWTP | Spencerville | 0.26 |
| Lakengren Water Authority | Eaton | 0.26 |
| Cridersville Village | Cridersville | 0.26 |
| Craig Beach WWTP | Craig Beach | 0.26 |
| Leesburg WWTP | Leesburg | 0.26 |
| Woodbran Realty WWTP | Woodmere | 0.26 |
| Genoa WWTP | Genoa | 0.25 |
| Amanda WWTP | Amanda | 0.25 |
| Malvern Water Pollution Control Center | Malvern | 0.24 |
| New Richmond WWTP | New Richmond | 0.24 |
| Piketon WWTP | Piketon | 0.24 |
| Miami Trails WWTP | Loveland | 0.23 |
| Athens Co., The Plains S.D. 1 Pws | The Plains | 0.23 |
| Trimble Township WWTP | Glouster | 0.23 |
| Oak Hill WWTP | Oak Hill | 0.23 |
| Cardington WWTP | Cardington | 0.22 |
| Quincy-Degraff STP | Quincy | 0.22 |
| Sugarcreek WWTP | Sugarcreek | 0.22 |
| Payne WWTP | Payne | 0.22 |
| New Concord WWTP | New Concord | 0.22 |
| Arcanum Water And Light Department (0819020226) | Arcanum | 0.22 |
| West Salem WWTP | West Salem | 0.22 |
| Mantua WWTP | Mantua | 0.22 |
| Woodville WWTP | Woodville | 0.22 |
| Smithville WWTP | Smithville | 0.22 |
| Middleport Village Pws | Middleport | 0.22 |
| Killbuck WWTP | Killbuck | 0.22 |
| Stark Co Magnolia WWTP | Canton | 0.22 |
| Ripley Sewage Treatment Plant | Ripley | 0.22 |
| Fredericktown Village-Fredericktown WTP | Fredericktown | 0.22 |
| West Liberty STP | West Liberty | 0.22 |
| Geneva-On-The-Lake WWTP | Geneva On The Lake | 0.21 |
| Jackson Center WWTP | Jackson Center | 0.21 |
| Anna STP | Anna | 0.21 |
| Bradford Village Of Bradford STP | Bradford | 0.21 |
| Mcconnelsville WWTP | Mcconnelsville | 0.21 |
| Earnhart Hill Regional W & Sd WWTP #2 | Circleville | 0.21 |
| West Portsmouth WWTP | West Portsmouth | 0.21 |
| Kingston WWTP | Kingston | 0.2 |
| Rockford STP | Rockford | 0.2 |
| Little Walnut Sycamore WRF | Canal Winchester | 0.2 |
| Sciotoville WWTP | Portsmouth | 0.2 |
| Thornville WWTP | Thornville | 0.2 |
| Weston WWTP | Weston | 0.2 |
| Adena WWTP | Adena | 0.2 |
| Twin Lakes WWTP | Kent | 0.2 |
| Aberdeen WWTP | Aberdeen | 0.2 |
| Garrettsville WWTP | Garrettsville | 0.19 |
| Newcomerstown WWTP | Newcomerstown | 0.19 |
| Darbydale WWTP | Columbus | 0.19 |
| Pandora WWTP | Pandora | 0.19 |
| Leetonia WWTP | Leetonia | 0.19 |
| Eaton Homes WWTP | Elyria | 0.19 |
| Bloomingburg WWTP | Bloomingburg | 0.19 |
| Lewisburg WWTP | Lewisburg | 0.19 |
| New Miami WWTP | New Miami | 0.19 |
| South Charleston WWTP | S. Charleston | 0.18 |
| Flushing WWTP | Flushing | 0.18 |
| Pemberville WWTP | Pemberville | 0.18 |
| Burton WWTP | Burton | 0.18 |
| Camden WWTP | Camden | 0.18 |
| Saint Paris WWTP | St. Paris | 0.18 |
| West Alexandria WWTP | W Alexandria | 0.18 |
| Farmersville WWTP | Farmersville | 0.17 |
| Put-In-Bay STP | Put In Bay | 0.17 |
| Pomeroy WWTP | Pomeroy | 0.17 |
| Plymouth WWTP | Plymouth | 0.17 |
| Botkins WWTP | Botkins | 0.17 |
| West Lafayette WWTP | W Lafayette | 0.17 |
| Walnut Creek Sd | Baltimore | 0.17 |
| Monroeville WWTP | Monroeville | 0.17 |
| Sycamore Creek WRF | Pickerington | 0.17 |
| Ottoville WWTP | Ottoville | 0.17 |
| Millersport STP | Millersport | 0.16 |
| Mcarthur WWTP | Mcarthur | 0.16 |