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Stormwater Information

The State's Water Board has stringent requirements on projects that will replace or add new impervious surfaces.  If your proposal will add or replace any outdoor impervious surfaces, please complete the C.3 and C.6 Development Review Checklist and attach it to your building permit application. If you would like the review checklist as an excel spreadsheet, please contact us at (415) 508-2120.  For small projects and residential, please complete the Stormwater Checklist for Small projects.

Note that the stormwater checklist is an initial screening form/worksheet and depending on your project, supplemental materials may also be required.

For further information regarding construction and stormwater, please visit the San Mateo County - Water Pollution Prevention website.  Also, for more detailed technical information on requirements for new development and redevelopment projects which would replace impervious surface, including the county-wide C.3 Technical Guidance handbook, go to Flows to Bay Technical Guidance.  The C.3 Technical Guidance handbook and other resources on that page was designed to help developers, builders, and project sponsors include post-construction stormwater controls in their projects, in order to meet local municipal requirements that reduce the long term impacts of development on stormwater quality and creek channels.  For the C.3 regulations refer to the California Regional Water Quality Control Board Municipal Regional Stormwater NPDES Permit.