| Organization Name | City | State |
| Akron Water Reclamation Services | Akron | OH |
| Albany County Water Purification District | Albany | NY |
| Albuquerque Bernalillo County Water Utility Authority | Albuquerque | NM |
| Alexandria Renew Enterprises | Alexandria | VA |
| Allegheny County Sanitary Authority | Pittsburgh | PA |
| American Bottoms Regional Wastewater Treatment Facility | Sauget | IL |
| Anchorage Water & Wastewater Utility | Anchorage | AK |
| Anne Arundel County Department of Public Works | Millersville | MD |
| Arlington County Department of Environmental Services - Water Pollution Control Bureau | Arlington | VA |
| Atlantic County Utilities Authority | Pleasantville | NJ |
| Austin Water | Austin | TX |
| Avon Lake Regional Water | Avon Lake | OH |
| Baltimore City Department of Public Works | Baltimore | MD |
| Bayshore Regional Sewerage Authority | Union Beach | NJ |
| Beaufort Jasper Water & Sewer Authority | Okatie | SC |
| Beckley Sanitary Board | Beckley | WV |
| Benbrook Water Authority | Benbrook | TX |
| Bergen County Utilities Authority | Little Ferry | NJ |
| Bloomington & Normal Water Reclamation District | Bloomington | IL |
| Board of Public Utilities - City of Cheyenne | Cheyenne | WY |
| Boston Water & Sewer Commission | Boston | MA |
| Bowling Green Municipal Utilities | Bowling Green | KY |
| Boxelder Sanitation District | Fort Collins | CO |
| Buffalo Sewer Authority | Buffalo | NY |
| Camden County Municipal Utilities Authority | Camden | NJ |
| Capital Region Water | Harrisburg | PA |
| Caveland Environmental Authority | Cave City | KY |
| Centennial Water & Sanitation District | Highlands Ranch | CO |
| Central Contra Costa Sanitary District | Martinez | CA |
| Central Davis Sewer District | Kaysville | UT |
| Central Marin Sanitation Agency | San Rafael | CA |
| Charles Town Utility Board | Charles Town | WV |
| Charleston Water System | Charleston | SC |
| Charlotte Water | Charlotte | NC |
| Chesterfield County Utilities | Chester | VA |
| Citizens Energy Group | Indianapolis | IN |
| City and County of Honolulu | Honolulu | HI |
| City of Aberdeen, SD Water Reclamation Plant | Aberdeen | SD |
| City of Albany, OR | Albany | OR |
| City of Ames Water & Pollution Control Department | Ames | IA |
| City of Atlanta Department of Watershed Management | Atlanta | GA |
| City of Augusta Utilities Department | Augusta | GA |
| City of Aurora | Aurora | CO |
| City of Bangor | Bangor | ME |
| City of Beloit Water Resources Division | Beloit | WI |
| City of Billings | Billings | MT |
| City of Boca Raton Utility Services Department | Boca Raton | FL |
| City of Boise | Boise | ID |
| City of Bozeman | Bozeman | MT |
| City of Canton Water Reclamation Facility | Canton | OH |
| City of Cedar Rapids, Utilities Department | Cedar Rapids | IA |
| City of Clinton POTW | Clinton | NC |
| City of Columbus Department of Public Utilities | Columbus | OH |
| City of Corpus Christi - Water Utilities | Corpus Christi | TX |
| City of Corvallis Public Works Department | Corvallis | OR |
| City of Cumming | Cumming | GA |
| City of Dallas Water Utilities | Dallas | TX |
| City of Dayton Department of Water | Dayton | OH |
| City of Defiance | Defiance | OH |
| City of Denison | Denison | TX |
| City of Des Moines | Des Moines | IA |
| City of Elyria Wastewater Pollution Control | Elyria | OH |
| City of Everett Public Works Department | Everett | WA |
| City of Fairmont | Fairmont | WV |
| City of Fitchburg DPW- Wastewater Division | Fitchburg | MA |
| City of Fond du Lac Wastewater Treatment & Resource Recovery Facility | Fond Du Lac | WI |
| City of Fort Collins Utilities | Fort Collins | CO |
| City of Fort Lupton | Fort Lupton | CO |
| City of Fort Wayne | Fort Wayne | IN |
| City of Fresno Department of Public Utilities | Fresno | CA |
| City of Garden City, ID | Garden City | ID |
| City of Garland | Garland | TX |
| City of Grand Rapids Environmental Services | Grand Rapids | MI |
| City of Greeley Water and Sewer Department | Greeley | CO |
| City of Greensboro Water Resources Department | Greensboro | NC |
| City of Gresham Department of Environmental Services | Gresham | OR |
| City of Henderson | Henderson | NV |
| City of Hollister | Hollister | CA |
| City of Hollywood | Hollywood | FL |
| City of Houston Public Works & Engineering/Public Utilities Division | Houston | TX |
| City of Ithaca Department of Public Works | Ithaca | NY |
| City of Jackson, MS | Jackson | MS |
| City of Jeffersonville Wastewater Department | Jeffersonville | IN |
| City of Johnson City | Johnson City | TN |
| City of Joliet, Department of Public Utilities | Joliet | IL |
| City of Kingsport | Kingsport | TN |
| City of Lakewood | Lakewood | OH |
| City of Lancaster | Lancaster | PA |
| City of Las Vegas Water Pollution Control Facility | Las Vegas | NV |
| City of Lawrence Department of Utilities | Lawrence | KS |
| City of Lebanon, OH | Lebanon | OH |
| City of Liberty | Liberty | MO |
| City of Lima Utilities Department | Lima | OH |
| City of Lockport | Lockport | IL |
| City of Los Angeles - LA Sanitation | Los Angeles | CA |
| City of Lynchburg Department of Water Resources | Lynchburg | VA |
| City of Lynnwood | Lynnwood | WA |
| City of Manchester Public Works Department | Manchester | NH |
| City of Mesa Water Resources | Mesa | AZ |
| City of Moberly | Moberly | MO |
| City of Muscatine | Muscatine | IA |
| City of Olathe | Olathe | KS |
| City of Omaha Public Works Department | Omaha | NE |
| City of Palo Alto Regional Water Quality Control Plant | Palo Alto | CA |
| City of Phoenix Water Services Department | Phoenix | AZ |
| City of Pocatello Water Pollution Control Department | Pocatello | ID |
| City of Portland Bureau of Environmental Services | Portland | OR |
| City of Prineville | Prineville | OR |
| City of Pueblo Wastewater Department | Pueblo | CO |
| City of Raleigh Public Utilities Department | Raleigh | NC |
| City of Richmond Department of Public Utilities | Richmond | VA |
| City of Richmond, CA | Richmond | CA |
| City of Riverside Water Reclamation Plant | Riverside | CA |
| City of Rochester, MN Water Reclamation Plant | Rochester | MN |
| City of Roseville Environmental Utilities | Roseville | CA |
| City of Saco | Saco | ME |
| City of Sacramento | Sacramento | CA |
| City of Saginaw | Saginaw | MI |
| City of Saint Charles, Missouri | Saint Charles | MO |
| City of San Bernardino Municipal Water Department | San Bernardino | CA |
| City of San Diego Public Utilities | San Diego | CA |
| City of Santa Barbara | Santa Barbara | CA |
| City of Santa Cruz Wastewater Treatment Facility | Santa Cruz | CA |
| City of Santa Fe | Santa Fe | NM |
| City of Sidney | Sidney | OH |
| City of South Bend Wastewater Treatment Plant | South Bend | IN |
| City of South Burlington Water Quality Department | South Burlington | VT |
| City of Springfield, MO | Springfield | MO |
| City of St. Joseph Water Protection | Saint Joseph | MO |
| City of Sunnyvale Water Pollution Control Plant | Sunnyvale | CA |
| City of Superior, Environmental Services Division | Superior | WI |
| City of Tacoma, Environmental Services Department | Tacoma | WA |
| City of Thousand Oaks Public Works Department | Thousand Oaks | CA |
| City of Toledo Department of Public Utilities | Toledo | OH |
| City of Tulsa Water and Sewer Department | Tulsa | OK |
| City of Twin Falls | Twin Falls | ID |
| City of Valparaiso Elden Kuehl Pollution Control Facility | Valparaiso | IN |
| City of Vancouver | Vancouver | WA |
| City of Virginia Beach Department of Public Utilities | Virginia Beach | VA |
| City of Wichita | Wichita | KS |
| City of Wilmington Department of Public Works | Wilmington | DE |
| City of Worcester | Worcester | MA |
| Clark County Water Reclamation District | Las Vegas | NV |
| Clark Regional Wastewater District | Vancouver | WA |
| Clean Water Services | Hillsboro | OR |
| Colorado Springs Utilities Environmental Services | Colorado Springs | CO |
| Columbus Water Works | Columbus | GA |
| County of Stafford Department of Utilities | Stafford | VA |
| Daphne Utilities | Daphne | AL |
| DC Water | Washington | DC |
| DeKalb County Department of Watershed Management | Decatur | GA |
| DeKalb County Public Works - Roads and Drainage Division | Decatur | GA |
| Delaware County Regional Water Quality Control Authority | Chester | PA |
| Delta Diablo | Antioch | CA |
| Derry Township Municipal Authority | Hershey | PA |
| Detroit Water & Sewerage Department | Detroit | MI |
| Downers Grove Sanitary District | Downers Grove | IL |
| East Baton Rouge Sewerage Commission | Baton Rouge | LA |
| East Bay Municipal Utility District | Walnut Creek | CA |
| EJ Water Cooperative, Inc. | Dieterich | IL |
| El Paso Water Utilities Public Service Board | El Paso | TX |
| Emerald Coast Utilities Authority | Pensacola | FL |
| Encina Wastewater Authority | Carlsbad | CA |
| Erie County Division of Sewerage Management | Buffalo | NY |
| Fairfax County Wastewater Management Program | Fairfax | VA |
| Fairfield-Suisun Sewer District | Fairfield | CA |
| Flagg Creek Water Reclamation District | Burr Ridge | IL |
| Fort Worth Water Department | Fort Worth | TX |
| Fox Metro Water Reclamation District | Oswego | IL |
| Fox River Water Reclamation District | South Elgin | IL |
| Gary Sanitary District | Gary | IN |
| Genesee County Division of Water and Waste Services | Flint | MI |
| Glenbard Wastewater Authority | Glen Ellyn | IL |
| Great Lakes Water Authority | Detroit | MI |
| Greater New Haven Water Pollution Control Authority | New Haven | CT |
| Greater Peoria Sanitary District | Peoria | IL |
| Greenwood Metropolitan District | Greenwood | SC |
| Gulf Coast Authority | Houston | TX |
| Gwinnett County Department of Water Resources | Lawrenceville | GA |
| Hallsdale Powell Utility District | Powell | TN |
| Hampton Roads Sanitation District | Virginia Beach | VA |
| Hannibal Board of Public Works | Hannibal | MO |
| Hanover County Department of Public Utilities | Hanover | VA |
| Hanover Sewerage Authority | Whippany | NJ |
| Hopewell Water Renewal | Hopewell | VA |
| Independence Water Pollution Control Department | Independence | MO |
| Inland Empire Utilities Agency | Chino | CA |
| Iowa Lakes Regional Water | Spencer | IA |
| Jefferson City Public Works Department | Jefferson City | MO |
| Jefferson County Commission | Birmingham | AL |
| Jefferson County Public Service District | Kearneysville | WV |
| Johnson County Wastewater | Olathe | KS |
| Joint Facility/Colchester-East Hampton | East Hampton | CT |
| Joint Meeting of Essex & Union Counties | Elizabeth | NJ |
| Kankakee River Metropolitan Agency | Kankakee | IL |
| KC Water | Kansas City | MO |
| King County Wastewater Treatment Division | Seattle | WA |
| Kishwaukee Water Reclamation District | DeKalb | IL |
| Knoxville Utilities Board | Knoxville | TN |
| Lake County Special Districts | Lakeport | CA |
| Lakehaven Water & Sewer District | Federal Way | WA |
| Las Virgenes Municipal Water District | Calabasas | CA |
| Little Blue Valley Sewer District | Independence | MO |
| Little Rock Water Reclamation Authority | Little Rock | AR |
| Los Angeles County Department of Public Works | Alhambra | CA |
| LOTT Clean Water Alliance | Olympia | WA |
| Loudoun Water | Ashburn | VA |
| Louisville & Jefferson County Metropolitan Sewer District | Louisville | KY |
| Lowell Regional Wastewater Utility | Lowell | MA |
| Macon Water Authority | Macon | GA |
| Madison Metropolitan Sewerage District | Madison | WI |
| Marion County Utilities | Belleview | FL |
| Massachusetts Water Resources Authority | Boston | MA |
| Maui County, Department of Environmental Management | Wailuku | HI |
| Metro Wastewater Reclamation District | Denver | CO |
| Metropolitan Council Environmental Services | Saint Paul | MN |
| Metropolitan Government of Nashville & Davidson County | Nashville | TN |
| Metropolitan Sewer District of Greater Cincinnati | Cincinnati | OH |
| Metropolitan Sewerage District of Buncombe County | Asheville | NC |
| Metropolitan St. Louis Sewer District | Saint Louis | MO |
| Metropolitan Wastewater Management Commission | Springfield | OR |
| Metropolitan Water Reclamation District of Greater Chicago | Chicago | IL |
| Miami-Dade County Water and Sewer Department | Miami | FL |
| Middlesex County Utilities Authority | Sayreville | NJ |
| Milwaukee Metropolitan Sewerage District | Milwaukee | WI |
| Mobile Area Water & Sewer System | Mobile | AL |
| Monroe County Department of Environmental Services | Rochester | NY |
| Monterey One Water | Monterey | CA |
| Montgomery County Environmental Services | Kettering | OH |
| Montgomery Water Works & Sanitary Sewer Board | Montgomery | AL |
| Morgantown Utility Board | Morgantown | WV |
| Mount Pleasant Waterworks | Mount Pleasant | SC |
| Murfreesboro Water Resources Department | Murfreesboro | TN |
| Narragansett Bay Commission | Providence | RI |
| NEW Water | Green Bay | WI |
| North Bergen Municipal Utilities Authority | North Bergen | NJ |
| North Royalton Consolidated Sanitary Sewer District | North Royalton | OH |
| North Shore Water Reclamation District | Gurnee | IL |
| North Texas Municipal Water District | Wylie | TX |
| Northeast Ohio Regional Sewer District | Cleveland | OH |
| Novato Sanitary District | Novato | CA |
| NYC Department of Environmental Protection | Albany | NY |
| Oak Lodge Water Services District | Milwaukie | OR |
| Oakland County Water Resources Commissioner | Waterford | MI |
| Ocean County Utilities Authority | Bayville | NJ |
| Onondaga County Department of Water Environment Protection | Syracuse | NY |
| Orange County Sanitation District | Fountain Valley | CA |
| Orange County Utilities | Orlando | FL |
| Orange Water & Sewer Authority | Carrboro | NC |
| Pasco County Utilities | New Port Richey | FL |
| Passaic Valley Sewerage Commission | Newark | NJ |
| Philadelphia Water Department | Philadelphia | PA |
| Pierce County, Planning and Public Works, Surface Water Management | Tacoma | WA |
| Pima County Regional Wastewater Reclamation Department | Tucson | AZ |
| Pine Bluff Wastewater Utility | Pine Bluff | AR |
| Pittsburgh Water & Sewer Authority | Pittsburgh | PA |
| Plainfield Area Regional Sewerage Authority | Middlesex | NJ |
| Platte Canyon Water and Sanitation District | Littleton | CO |
| Pleasant View Water & Sanitation District | Golden | CO |
| Portland Water District | Portland | ME |
| Prince William County Service Authority | Woodbridge | VA |
| Puerto Rico Aqueduct and Sewer Authority | San Juan | PR |
| Racine Wastewater Utility | Racine | WI |
| Rahway Valley Sewerage Authority | Rahway | NJ |
| Renewable Water Resources | Greenville | SC |
| Rock River Water Reclamation District | Rockford | IL |
| Rockland County Sewer District #1 | Orangeburg | NY |
| Sacramento Regional County Sanitation District | Sacramento | CA |
| Salt Lake City Corporation | Salt Lake City | UT |
| San Antonio Water System | San Antonio | TX |
| San Francisco Public Utilities Commission | San Francisco | CA |
| San Jacinto River Authority | The Woodlands | TX |
| Sanitary District of Decatur | Decatur | IL |
| Sanitation Districts of Los Angeles County | Whittier | CA |
| Santa Rosa Water | Santa Rosa | CA |
| Seattle Public Utilities | Seattle | WA |
| Secaucus Municipal Utilities Authority | Secaucus | NJ |
| Sewerage & Water Board of New Orleans | New Orleans | LA |
| Snyderville Basin Water Reclamation District | Park City | UT |
| South Essex Sewerage District | Salem | MA |
| South Orange County Wastewater Authority | Dana Point | CA |
| Spartanburg Water | Spartanburg | SC |
| Springfield Water & Sewer Commission | Springfield | MA |
| Stony Brook Regional Sewerage Authority | Princeton | NJ |
| Summerville Commissioners of Public Works | Summerville | SC |
| Taylors Fire & Sewer District | Taylors | SC |
| The Metropolitan District | Hartford | CT |
| The Town of Greenwich | Greenwich | CT |
| Thorn Creek Basin Sanitary District | Chicago Heights | IL |
| Timpanogos Special Service District | American Fork | UT |
| Toho Water Authority | Kissimmee | FL |
| Town of Cary | Cary | NC |
| Trinity River Authority of Texas | Arlington | TX |
| Unified Government of Wyandotte County | Kansas City | KS |
| Union Sanitary District | Union City | CA |
| Upper Blackstone Water Pollution Abatement District | Millbury | MA |
| Upper Occoquan Service Authority | Centreville | VA |
| Upper Trinity Regional Water District | Lewisville | TX |
| Urbana & Champaign Sanitary District | Urbana | IL |
| Vallejo Flood and Wastewater District | Vallejo | CA |
| Victor Valley Wastewater Reclamation Authority | Victorville | CA |
| Washington Suburban Sanitary Commission | Upper Mrlboro | MD |
| Water Environment Services of Clackamas County | Oregon City | OR |
| Water Pollution Control Authority for the City of Norwalk | Norwalk | CT |
| Wayne County DPS Environmental Services Group | Detroit | MI |
| West County Wastewater District | Richmond | CA |
| Westchester County Department of Environmental Facilities | New Rochelle | NY |
| Western Lake Superior Sanitary District | Duluth | MN |
| Western Monmouth Utilities Authority | Englishtown | NJ |
| Western Virginia Water Authority | Roanoke | VA |
| Wheaton Sanitary District | Wheaton | IL |
| Yorkville-Bristol Sanitary District | Yorkville | IL |
| Ypsilanti Community Utilities Authority | Ypsilanti | MI |
