The ODEQ currently regulates 43 Phase II entities (34 cities, 5 counties, 4 non-traditionals) in addition to 2 Phase I municipalities.  Active members of COSWA are listed below:

City of Bethany

City of Edmond

City of Midwest City

City of Moore

City of Nichols Hills

City of Norman

City of Oklahoma City

City of Yukon

Department of Transportation

Oklahoma County