The Water Quality Division of the Public Works Department is responsible for ensuring that new development sites or sites under renovation do not pollute the storm drain system. All projects requiring discretionary and some requiring ministerial City approval are required to prepare a Water Quality Management Plan (WQMP) in accordance with the Orange County Drainage Area Management Plan (DAMP) and City of Orange Local Implementation Plan (LIP). The WQMP is intended to provide information related to the project's potential to generate and mitigate pollutants on-site and prevent impacts to public property. The WQMP contains project information related to site characteristics, expected pollutants, hydrologic impacts, structural and non-structural best management practices (BMPs), Low Impact Development (LID) design features, operation and maintenance, training and public education. For more information, click here.