The City's Jurisdictional Runoff Management Plan and all six Water Quality Improvement Plans are available to the public; see links below.
The City's Jurisdictional Runoff Management Plan (JRMP) encompasses citywide programs and activities designed to prevent and reduce storm water pollution within City boundaries. The JRMP describes the pollution prevention activities that the City implements as well as the pollution prevention requirements for homes and businesses.
As part of the JRMP update, the City developed an updated Storm Water Ordinance and a corresponding set of “Minimum Best Managements Practices” that set guidelines and expectations for pollution prevention efforts by homeowners, commercial property owners, and businesses throughout the City’s jurisdiction.
The City collaborated with other Responsible Agencies and stakeholders throughout the San Diego Region to develop Water Quality Improvement Plans for each watershed within its jurisdiction. The plans are tailored to each watershed, identifying problems and corresponding solutions that the City will implement to improve water quality and comply with the requirements of the Municipal Storm Water Permit. These plans identify goals and strategies for addressing priority water quality conditions in each watershed. To learn more about your watershed, click the link below:
Through a regulatory process known as a Total Maximum Daily Load (TMDL), the City of San Diego and other municipalities in the Chollas Creek Watershed were required to improve the water quality in Chollas Creek because storm water runoff containing dissolved copper, lead and zinc was negatively impacting aquatic life. In 2008, the San Diego Water Board adopted the dissolved copper, lead and zinc TMDL to reduce a significant portion of these pollutants from getting into the creek over a 20-year period. Because the TMDL was adopted before sufficient data was gathered, overly conservative statewide numeric limits for dissolved copper, lead and zinc were set as the target to ensure that the creek would be protected. It was noted in the original documentation that if new data was collected, it could be considered for a future update to the TMDL.
Using U.S. Environmental Protection Agency protocols, the City conducted a water effects ratio monitoring and computer modeling project to more accurately determine the amount of dissolved copper and zinc in storm water runoff. The purpose of the water effects ratio was to determine the amount of dissolved copper and zinc that could make its way into the creek without harming the aquatic life, such as the insects that small fish and other wildlife feed on. This analysis determined that lead was no longer a pollutant of concern for the creek because the initial TMDL data was out of date and lead had been removed from gasoline.
Once the monitoring and modeling were completed, the City submitted this information to the San Diego Water Board to update and replace the original TMDL numeric targets with the new measured concentrations. The new copper and zinc concentrations were used to determine the number of best management practices that would need to be built to meet these new targets and to protect the aquatic life. By using current monitoring data and best available science to update this important water quality regulation, the City estimated it can save approximately $870 million over the next 20 years in best management practices costs while still maintaining a healthy water quality environment in Chollas Creek. This project was presented and adopted by the San Diego Water Quality Control Board, Region 9 by Resolution R9-2017-0015 on Feb. 8, 2017.