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Sonoma Public Infrastructure (formerly TPW)


Transportation and Public Works is now Sonoma Public Infrastructure - Website updates coming soon!


Charles M. Schulz - Sonoma County Airport (STS)

The Charles M. Schulz - Sonoma County Airport (STS) offers nonstop service to and from Los Angeles, Seattle, Portland, and San Diego, as well as amenities such as affordable parking, shorter lines, and fine dining.


Integrated Waste

The SPI Integrated Waste Division owns the Sonoma County Central Landfill, which houses facilities for recycling, material reuse and natural gas and electrical generation. It owns five refuse transfer stations, oversees the regulation of two commercial hauling companies and maintains closed landfills.


Roads Division

Road Maintenance and Construction is a division of the Department of Transportation & Public Works (TPW). The TPW Roads Division strives to maintain Sonoma County roads safe and passable.



Sonoma County Transit provides provides high-quality yet cost-effective local and intercity public transportation throughout most of the major communities in Sonoma County, as well as Novato and San Rafael in Marin County.


Water Systems

The Department of Transportation & Public Works (TPW) administers water service to four small districts: Fitch Mountain, Freestone, Jenner, and Salmon Creek.