• Allen Water District, Allen County
• Athens County Commissioners
• Bath Township, Summit County
• Burr Oak Regional Water District, Athens County
• Butler Township Sewer & Water District, Montgomery County
• Candlewood Lake Association, Morrow County
• Carroll Water & Sewer District, Ottawa County
• Chickasaw, Village of, Mercer County
• Chippewa Township, Wayne County
• Circleville, City of, Pickaway County
• Clarksburg, Village of,  Ross County
• Clinton Water & Sewer District, Knox County
• Deerfield Township, Warren County
• City of Defiance, Defiance County
• Fairfield Township, Butler County
• Falls Township, Muskingum County
• Genoa Township, Delaware County
• German Township, Montgomery County
• Green Township, Ross County
• Greenfield Township Regional Water & Sewer District, Fairfield County
• Henry County Commissioners
• Henry County Planning Commission, Henry County
• Hopewell Township, Seneca County
• Howland Township, Trumbull County
• Jefferson Water & Sewer District, Franklin County
• Jefferson Township, Madison County
• Jefferson Township, Franklin County
• Jefferson Township, Mercer County
• Kinnikinnick Sewer District, Ross County
• Lake Township, Stark County
• LORCO Rural Wastewater District, Lorain County
• Loudon Township, Seneca County
• Madison Township, Franklin County
• Madison Township, Richland County
• Village of Marblehead, Ottawa County
• Newark, City of, Licking County
• Northwest Regional Water District, Scioto County
• Old Straitsville Water Association, Hocking County
• Perry Township, Wood County
• Pickaway Township, Pickaway County
• Plain Township, Franklin County
• Pleasant Township, Van Wert County
• Pleasant Valley Regional Sewer District, Ross County
• Village of Put-In-Bay, Ottawa County
• Randolph Township, Montgomery County
• Ross County Water Co., Inc., Ross County
• Sandusky Township Sewer District, Sandusky County
• Scioto Township, Ross County
• Scippo Sewer District, Pickaway County
• Smith Township, Mahoning County
• Sylvania Water & Sewer District, Lucas County
• Tri County Water Authority, Harrison County
• Village of Williamsport, Pickaway County
• Violet Water & Sewer District, Fairfield County
• Xenia Township, Greene County

Note: We list only political subdivision clients here. Private clients and developer clients are not listed.