Stormwater quality permit

If your project creates more than 2,500 square feet of new impervious area, or changes the existing drainage pattern on the property, a stormwater quality permit is required.

What is needed to make an application for a drainage permit? Copies of the following items are required to be submitted digitally by bringing PDF copies to the Permit Center on a thumb drive.

• Drainage plans, sized 24”x36”, and prepared by a licensed civil engineer. The County’s Standard Cover Sheet should be used in the plan preparation, with PDF and DWG formatted templates linked. Erosion Control Plans, including 24”x36” copies of the Erosion Control Template EC-1 and Erosion Control Template EC-2, shall be included in the plan set.
• C3 Permit Fee.
• Signed copy of the Disturbed Area Calculation for sites draining to San Francisco Bay or LID Worksheet for sites draining to Monterey Bay.

The approved drainage plan will be sealed with an APPROVED stamp and placed in the record. Drainage improvements must be inspected and approved by the Land Development Engineering Inspector. For additional information, see our Drainage Manual​.