Utility Trench

To dig a utility trench in the right-of-way of San Mateo County's unincorporated districts requires an encroachment permit from the Department of Public Works.

Permit Fees

  • Behind walkways, paths, sidewalks - $127
  • For laterals and other services in the travel way - $380
  • For a main line less than or equal to 100 feet - $1900
  • For a main line greater than 100 feet - $1900 +0.50/foot of trench


Utility Trench Standard Drawings

Encroachment Permit Checklist for Utility Trench