Monitoring and Characterization Studies
Discharge Characterization Study Report
Overview of the Department stormwater characterization activities, descriptions of the methods used to produce and evaluate the data, results of the characterization monitoring and data analysis, and conclusions pertinent to management of stormwater runoff from transportation facilities.
Roadside Vegetated Treatment Sites (RVTS) Study
Study to evaluate the removal of stormwater contaminants by existing vegetated slopes adjacent to freeways.
Caltrans 1999/2000 First Flush Study Report
Presents the results of the first flush characterization study conducted at three highway sites in District 7.
BMP Retrofit Pilot Program - Final Report
Pilot program to acquire experience in the installation and operation of a wide range of structural BMPs for treating stormwater runoff from existing Caltrans facilities and to evaluate the performance and costs of these devices.
Stormwater Management Plan and Permit
Statewide Stormwater Management Plan (PDF) (July 2016)
Caltrans NPDES Statewide Stormwater Permit (PDF) (September 2012)
This permit regulates all municipal stormwater activities by Caltrans in California, including construction that requires a permit under federal regulations. It describes the process for Caltrans to self-audit Maintenance facilities and activities for stormwater compliance with its MS4 Permit and other regulations.