Drainage Pipe


To install, replace, or modify a drainage facility in the right-of-way of San Mateo County's unincorporated districts requires an encroachment permit from the Department of Public Works.

Permit Fees
  • Old Drainage Facility (remove and replace in kind, no excavation) - $134
  • New Drainage Facility, modification, adjustment, upgrades, etc. - $697

San Mateo County Drainage Review Guidelines

Stormwater Submittal Checklist

C3 and C6 Development Review Checklist

San Mateo County Rainfall Runoff Data