Abstract
Pollutants in urban storm water runoff, a significant and increasing fraction of pollutants in some waters of the U.S., originate from multiple activities. The industrial sector, one source category, is subject to federal and state‐level storm water pollution prevention regulations, primarily General NPDES Permits that rely heavily on facility operators to identify themselves and develop appropriate site‐specific pollutant controls. Degree of compliance is not readily determined and enforcement is inhibited because no publicly‐available inventories contain data necessary to comprehensively identify facilities required to comply. This research evaluates the first stage of compliance, facility self‐identification, concentrating on the motor‐vehicle, transportation industry category using data at three scales: statewide, regional, and local or watershed. Data for California statewide and for the Los Angeles region show about 8 percent to 15 percent of motor‐vehicle transportation facilities have complied with first‐stage requirements. However, facility‐specific evaluation in one Los Angeles County watershed suggests less than 50 percent of facilities in the industry conduct industrial activities of the kind covered by regulations; others need not comply. Results show strong variation by industry category. Second‐stage compliance, follow‐up reporting, is also evaluated for the Los Angeles region. About 17 percent to 34 percent of facilities completing first‐stage requirements have also completed second‐stage requirements.
