Post-construction stormwater management in areas undergoing new development or redevelopment is necessary because runoff from these areas has been shown to affect receiving waterbodies significantly. Many studies indicate that prior planning and design for the minimization of pollutants in post-construction stormwater discharges is the most cost-effective approach to stormwater quality management.
Municipal Separate Storm Sewer Systems (MS4) Permit
Since 1990, operators of municipal separate storm sewer systems (MS4s) have been required to develop a stormwater management program designed to prevent harmful pollutants from impacting water resources via stormwater runoff. In Orange County, stormwater and urban runoff enter the stormwater system from streets, curbs and gutters, and travel, untreated, to local water bodies or the Pacific Ocean.
As an MS4 operator, the City of Yorba Linda must implement the requirements of the National Pollution Discharge Elimination System (NPDES) permits for the Santa Ana Regional Water Quality Control Board (SARWQCB) region. The Orange County Stormwater Program is a cooperative of the County of Orange, Orange County Flood Control District (OCFCD), and all 34 Orange County cities. In May and December 2009, the SARWQCB adopted the Fourth Term NPDES permits (PDF).
Water Quality Management Plans must meet North Orange County's requirements in compliance with the Technical Guidance Document (TGD). Please refer to County's website for WQMP template.