Regulatory Assistance Office
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The Department of Toxic Substances Control (DTSC) Regulatory Assistance Program provides regulatory compliance assistance, information, and research services to the generators, transporters, and facilities managing hazardous waste. We also provide assistance to other government entities and the public.
DTSC Regulatory Assistance Officers provide informal guidance only about the management of hazardous waste, as well as cleanup operations, for the convenience of the public. Such oral or electronic mail advice is not binding upon DTSC, nor does it have the force of law. You should also refer to the statutes and regulations, DTSC policies and procedures, and other formal documents.
If you would like a formal opinion on a matter by DTSC, please contact the responsible program office directly.
Finally, other DTSC programs have program-specific Duty Officers, liaisons and contacts. Here are a few key DTSC contact numbers:
Waste Alert Hotline (Complaints)
ID Numbers (State and Federal EPA),
Manifests and Transporters
(800) 698-6942 or (800) 69-TOXIC
NOTE: For an after-hours emergency ID number (Example: spills and clandestine lab cleanups), please call the Office of Emergency Services at (800) 852-7550
For Additional Questions, Contact the Regulatory Assistance Office
Toll-Free in CA: 800-728-6942 or 800 72-TOXIC
Outside CA: 916-324-2439
RAO Related Links
- Advisory on Used Oil Filters
- Compressed Gas Cylinders
- Discarded Battery Management at Facilities Handling Solid Waste and Recyclable Materials
- FAQ for Used Oil Collection Centers
- SB-14 Information (Archived)
- Solar Panels Information and FAQs
- Toxics in Products
- Used Oil Management
- Find a Registered Hazardous Waste Transporter
- DTSC Online Reference Library (DORY)