The San Francisco Bay Regional Water Quality Control Board (Water Board) reissued the Municipal Regional Stormwater Permit (MRP 3) and it went into effect July 1, 2022. Like the past stormwater permits, MRP 3 mandates stormwater control measures for specified development projects. MRP 3 includes several significant changes including changes to the types and sizes of regulated projects.
Key Changes Summarized in this Factsheet
Effective July 1, 2022
o Removal of the Tree Reduction Credits
Effective July 2, 2023*
o Changes to Regulated Project Thresholds
o Changes to Special Project Categories
* Until the effective date of the changes, the old definitions and categories remain in effect.