The San Diego Regional Water Quality Control Board (San Diego Water Board) issues the Phase I Municipal Separate Storm Sewer System (MS4) Permit to 39 municipal, county and special district entities in San Diego, south Orange and Southwestern Riverside Counties (known as Copermittees). This permit regulated what is allowed to leave our storm drain system and enter local waterways.
The MS4 Permit requires that all copermittees develop and enforce stormwater regulations to prohibit pollutants and other illegal discharges from entering the storm drain system. For more information, please visit our Code Enforcement webpage.
The City is required to update its Stormwater Standards Manual to conform to the 2013 MS4 Permit and for consistency with the Regional Model Best Management Practices (BMP) Design Manual.
*An update to the Stormwater Standards Manual will be posted in May 2021. The update is focused on clarifications to Priority Development Project determinations regarding routine maintenance activities.
The MS4 Permit provides Offsite Alternative Compliance, as an option for Priority Development Projects in lieu of implementing onsite structural best management practices to comply with pollutant control and hydromodification management requirements. The City will implement the alternative compliance program in two phases:
Right of Entry Permits are required when requesting entry into the City of San Diego’s storm drain infrastructure. See below for information on situations that require one, and instructions for applying for a permit.