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San Mateo County Public Works Department


San Mateo County Public Works Department

Furnishes engineering and maintenance services for all roads, bridges, water supply and sewage districts, airports and flood control zones in the unincorporated areas of the county.


Furnishes engineering services for the design, construction, inspection and maintenance of roads and bridges in the unincorporated areas of the county, not including state highways. Oversees all traffic control signs, pavement markings, highway lighting and signalization, and also includes the taking of traffic counts in the unincorporated area. Maintains county owned buildings. Has responsibility for solid waste disposal planning, parcel maps, subdivisions and record of survey maps and construction and design of street improvements by assessment district preceedings. Publishes official county map, including 400-scale, 800-scale, 2000- and 5000-scale maps of the county. In addition, 400-scale orthophoto maps are available. Provides generalized geologic information to the public. Reviews private consultant's geotechnical reports when submitted to county for approval. Oversees the San Carlos and Half Moon Bay airports and operates a transfer station near Pescadero. Manages ten sewage districts, nine drainage districts, three flood control zones, eleven lighting districts, two water supply districts, five county service areas and one landscape maintenance district in the unincorporated areas of the county. Airport services provided include lease and rental of hangar spaces and tie downs when available. Private contractors provide all additional aircraft oriented services including fuel, aircraft repair and flight instruction. Provides information on reuse, recycling and composting information for county residents and businesses by phone or via Web site ( Oversees fifteen county parks and two historic sites that provide over 16,000 acres of land accessible to the public.


Public Transit:

SAMTRANS, CALTRAIN stop within 3 blocks.
555 County Center, 5th Floor, Redwood City, CA 94063 37.488701 -122.230148 Government

Service Options

Languages Spoken:

  • Chinese
  • Italian
  • Spanish
  • Tagalog

Accessibility Options:

  • Disabled Parking
  • Disabled Restroom
  • Elevator
  • Ramp
  • Wheelchair



County maps must be purchased. Sewer service charges in specific districts, plan or map checking fees, airport rents, concession and user fees, encroachment permit fees, solid waste disposal fees at the landfill and surcharges and water sales in specific districts. Cash and checks accepted.



How to Apply:

Walk in or apply by phone.

Service Wait Estimate:

No wait to 48 hours (under emergency conditions).

Service Areas:

  • San Mateo County