Hazardous Materials Unit

The Hazardous Materials (HazMat) Unit has the responsibility for the County's Certified Unified Program Agency (CUPA) Programs.

Portions of the California Fire Code which address hazardous materials are also enforced by this Division. Inspections of businesses in the County which are included in any of these programs are conducted on a routine basis, and our Division often works in conjunction with the County’s Environmental Health Department as well as local fire departments.

Cleanup After Wildfires

For information about Household Hazardous Waste (HHW) Sweeps or the Debris Removal process after a recent wildfire visit: socoemergency.org/recover


Certified Unified Program Agency (CUPA) Programs

Funding for this Division is provided through fees charged to the businesses which are regulated by the County under these CUPA programs. There are approximately 1800 businesses covered by one or more of the CUPA programs. Information regarding hazardous materials in your community can be obtained from this Division.

There are three other CUPA agencies in Sonoma County which regulate facilities in their communities: Santa Rosa Fire Department, Petaluma Fire Department and Healdsburg Fire Department, which regulates facilities within Sebastopol and Healdsburg through a Joint Powers Agreement. If you have questions regarding facilities within any of those cities, contact the appropriate fire department.

California Public Records Act (PRA)

County Policy Public Records Request

An important responsibility our Unit has as the CUPA is sharing responsibility with the public on facilities within their community that handle hazardous materials under the California Public Records Act (CA Code 6250-6270). To submit a request for such information, visit Section 1-0-5 of our Policies and Procedures. Important: A site address or address range will need to be identified to obtain this information.

If your interested in Sonoma County Hazardous Materials Records for regulated business please click here. Please make sure to identify exactly what your looking for so we can process your request in a timely manner.

Please provide the following:

  • Address of site
  • Potential business(s) names
  • Record types
  • CERS Id if applicable
  • Contact information, email address, phone number, and mailing address

Sonoma County Environmental Health

  • UST Files prior to 1997
  • LOP and Groundwater Contamination
  • Click Here for Environmental Health


Information submitted to the California Environmental Reporting System has a public portal. To view records please see links below

  • Public Portal Map Link
  • CERS Public Records Request Link


California State Water Control Board

  • Published on November 20, 2019

    On November 16, 2019, Sonoma County Fire Prevention and Hazardous Materials Unit responded to an overturned tanker on Highway 121 near Sonoma. Approximately 3,000 gallons of fuel spilled on the ground. A successful stinger operation was initiated and the situation was mitigated.

  • Published on August 30, 2019

    In this issue of our e-newsletter we have:

    • Code Enforcement Takes Action on Illegal Cannabis Grows
    • Coastal Close-Up Photo Contest
    • HazMat Team Keeps Our Roads and Waterways Safe
    • Storm Drains Connect Streets to Creeks
    • Sonoma Developmental Center (SDC) Update
    • Performance Dashboards
  • More News

Contact Information

Steve Mosiurchak

Fire Warden / Fire Marshal

Permit and Resource Management Department

Business Hours
Monday – Friday
8:00 AM – 5:00 PM
Contact us by Phone

Fire Code Related to Hazardous Materials