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.
- Old Drainage Facility (remove and replace in kind, no excavation) - $130
- New Drainage Facility, modification, adjustment, upgrades, etc. - $677
San Mateo County Drainage Review Guidelines
Stormwater Submittal Checklist
C3 and C6 Development Review Checklist
San Mateo County Rainfall Runoff Data