Despite the fact that urban runoff has been regulated in the Los Angeles region since 1990, it remains the most significant source of surface water pollution in the area. The Los Angeles Regional Water Quality Control Board and the State Water Resources Control Board are responsible for protecting surface water and groundwater quality in the Los Angeles Region, including protecting the humans and ecosystems that depend on clean water. However, NRDC has found that the Regional Board is systematically failing to enforce water quality violations across the region, creating a culture of non-compliance among permittees, allowing pollution to go unabated, and jeopardizing public health and the environment. This report examines MS4-related violations that took place from December 2012 through October 2017 and MS4-related enforcement actions that took place between June 1990 and March 2018.
This report was edited on May 17, 2019 to reflect the fact that we analyzed enforcement actions that occurred through March of 2018, and not September of 2018.