Stormwater Management

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Stormwater Control

Stormwater runoff from urbanized areas is a major source of pollution to local creeks and San Francisco Bay. To comply with the Municipal Regional Stormwater Permit (MRP), reissued by the Regional Water Quality Control Board in 2022, the City of Walnut Creek requires development projects to incorporate appropriate Stormwater controls. These may include site design measures, source controls, low impact development (LID) techniques and Hydromodification Management (HM).

For more details please go see Stormwater Management C.3 Review Process

REGULATED PROJECTS

Analyze the feasibility of infiltrating, evapotranspirating, or harvesting/reusing runoff. Where none of these are feasible, runoff from impervious areas may be routed to Bioretention facilities.
In-ground vault filters or tree-well type of biofilters may be used only in specific, narrowly defined Special Projects categories of “Smart Growth” projects
The CCCWP Stormwater C.3 Guidebook (C.3 Guidebook) summarizes the policies, procedures, design and submittal requirements for projects in Contra Costa County.

NOT REGULATED PROJECTS

Determine the applicability of the MRP Section C.3.i, “Small Projects”
Where neither C.3.b nor C.3.i is applicable, the City of Walnut Creek encourages applicants to assess stormwater runoff and provide discussion of planned efforts to implement the best practices and goals outlined in the MRP.

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