Article Title

San Diego Regional Storm Water Monitoring Program: Contaminant Inputs to Coastal Wetlands and Bays





First Page


Last Page



A watershed-based, Regional Monitoring Program was established by the City of San Diego, the County of San Diego, the San Diego Unified Port District, and 1 7 other incorporated cities within the county to evaluate the water quality of their wet weather runoff. Seventeen different locations were sampled between 1993 and 1995, and samples were analyzed for priority pollutants and toxicity. In general, measurable quantities of some metals and fecal indicator bacteria were found consistently while nearly all organic contaminants were below method detection limits. Results indicated that residential areas had similar event mean concentrations (EMC) of suspended solids, oil and grease, cadmium, chro- mium, nickel, and zinc compared to industrial or commercial areas. The EMC of copper and lead from residential areas were higher relative to commercial or industrial areas. However, even EMC from residential areas of San Diego were lower than the EMC from other urbanized watersheds measured from around the country as part of the Nationwide Urban Runoff Program. Potential receiving water effects included 7-day chronic toxicity of storm water effluents to Cerio- daphnia. Storm water was responsible for increased contamination of Mission Bay receiving waters by fecal indicator bacteria and exceedences in water quality objectives resulted in post-storm beach closures.