DEP is a very diverse agency whose primary mission is to deliver water to and treat the effluent of more than 8 million City and upstate residents. DEP is also responsible for enforcement of the air, noise and hazardous materials laws and rules; billing and collection of water and sewer use charges; review of environmental impact statements; and administration of the Environmental Control Board. The Citywide Accountability Program (CAP) is a effort to track the City's performance in important areas. Below are five citywide indicators for DEP.