Caltrans MS4 Permit
The Caltrans MS4 Permit is enforced in the Santa Ana Water Board by the Municipal Stormwater Unit. The Permit is adopted by the State Water Resources Control Board. Additional information regarding the program is available at the State Water Resources Control Board website.
Program records are maintained in the SMARTS database. The Public User Menu provides access to SMARTS records without the user needing an account.
For additional information regarding the Caltrans MS4 Permit program, as regulated in the Santa Ana Water Board, contact Nam Nguyen (951) 321-4582.
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(Page last updated 1/8/26)
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