Caltrans Municipal Separate Storm Sewer System (MS4) Program
Announcements
- Public Notice for Comments on the Revised ASBS Compliance Plan (posted March 2025)
- Revised ASBS Compliance Plan (posted March 2025)
- Revised ASBS Compliance Plan in Track-Changes (posted June 2025)
Approved Plans
- Approved TMDL Compliance Plan, Appendices, and Attachments
- 1. TMDL Compliance Plan
- 2. Appendices A, B, and C
- 3a. Appendix D-Watershed Maps Part 1
- 3b. Appendix D-Watershed Maps Part 2
- 3c. Appendix D-Watershed Maps Part 3
- 3d. Appendix D-Watershed Maps Part 4
- 3e. Appendix D-Watershed Maps Part 5
- 3f. Appendix D-Watershed Maps Part 6
- 4. Appendices E, F, and G
- 5. Appendices H, I, J, and K
- 6. Attachments
- Approved Final Stormwater Management Plan (Approved 1/27/2025)
- Approved Trash Assessment Methodology
- Approved Trash Monitoring Plan
- Approved Caltrans Monitoring Plan (9/9/2024)
- Approved Addendum to Caltrans Monitoring Plan (9/9/2024)
View Our Program Pages
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.
- Click on the links, below, for the June 22, 2022, adopted Statewide Stormwater Permit and the Time Schedule Order for the California Department of Transportation.
- The Water Board uses the Stormwater Multiple Application and Report Tracking System (SMARTS) for collecting and processing stormwater regulatory data
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.
Subscribe to our Email Lists
- Subscribe to our "Stormwater Municipal Permitting Issues" list under the "Water Quality" section.
Contacts
- Caltrans Permit, Reports, and TMDL Requirements
stormwater@waterboards.ca.gov
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: stormwater@waterboards.ca.gov
