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Caltrans Municipal Separate Storm Sewer System (MS4) Program

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On June 22, 2022, the State Water Resources Control Board adopted the Statewide Stormwater Permit and Time Schedule Order for the California Department of Transportation.

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freeway Key Actions to Prevent Hiway Pollution

Clean Water Starts with Clean Highways

The goal of the California Department of Transportation's (Caltrans) Protect Every Drop campaign is to educate Californians about the sources and pathways of storm water pollution and to change behaviors of the public to reduce storm water pollution in and around the State highway system. Caltrans' objective is to encourage motorists to practice the following correct behaviors to prevent storm water pollution and protect water quality: wipe off brake dust build-up on rims and wheels, keep vehicles clean to prevent residue from washing off, reduce fluid leaks with regular vehicle maintenance, properly dispose of trash and recycling, tarp and secure trash, vegetation and other loads, keep tires properly inflated to prevent wear, and avoid pesticides and fertilizers when rain is forecast.

(Updated 02/12/2024)

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SMARTS Resources

  • The Stormwater Multiple Application and Report Tracking System (SMARTS) provides an online platform for the public to access stormwater information, including permittee reports, application documents, and monitoring and compliance data.
  • SMARTS Public User Menu.
  • SMARTS Help Desk: