Office Addresses and Phone Numbers

DTSC Headquarters (Joe Serna Jr. Cal/EPA Headquarters Building)

Physical Address:
1001 I Street
Sacramento, CA 95814-2828
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Mailing Address:
P.O. Box 806
Sacramento, CA 95812-0806

Berkeley Regional Office

700 Heinz Avenue Suite 200
Berkeley, CA 94710-2721
Phone: (510) 540-2122
Fax: (510) 540-3738
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Clovis Field Office

1515 Tollhouse Road
Clovis, CA 93611-0522
Phone: (559) 297-3903
Fax: (559) 297-3904
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Cypress Regional Office

5796 Corporate Avenue
Cypress, CA 90630-4732
Phone: (714) 484-5300
Fax: (714) 484-5302
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Pasadena Environmental Chemistry Laboratory

757 S. Raymond Avenue, Ste. 105
Pasadena, CA 91105
Phone: (626) 304-7801
Fax: (626) 304-4803
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San Diego Field Office

2375 Northside Drive, Ste. 100
San Diego, CA 92108
Phone: (619) 516-1982/1983
Fax: (619) 516-1963
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Berkeley Environmental Chemistry Laboratory

700 Heinz Avenue Suite 100
Berkeley, CA 94710-2721
Phone: (510) 540-3003
Fax: (510) 540-3615
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Chatsworth Regional Office

9211 Oakdale Avenue
Chatsworth, CA 91311-6505
Phone: (818) 717-6500
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Commerce Regional Office

6119 E. Washington Blvd., #120
Commerce, CA 90040
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Imperial County CUPA Office

627 Wake Avenue
El Centro, CA 92243
Phone: (760) 352-0381
Fax: (760) 352-1641
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Sacramento Regional Office - Cal Center

8800 Cal Center Drive
Sacramento, CA 95826-3200
Phone: (916) 255-3545
Fax: (916) 255-3785
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Additional Contact Information

Hazardous Waste Management
(800) 618-6942 (for EPA ID Numbers,Generators and Manifests)

Waste Alert Hotline
(800) 698-6942 (for complaints)

(800) 618-6942 (for assistance)

Regulatory Assistance Office
(800) 728-6942

DTSC Personnel Office
(916) 323-2679 (Employment Verification)

Need Assistance?

If you can’t find the information you’re looking for, or the answer to your question, our Regulatory Assistance Officers are able to help. Call (800) 72TOXIC or (800) 728-6942). From outside California, call (916) 324-2439. Please leave a message (including your email address and/or phone number) on the RAO phone message line and a Regulatory Assistance staff will contact you within 3 to 4 business days.

At DTSC, we are committed to being honest, open, responsive, and direct with the public. The links below direct you to various means of giving us your feedback.

  • We are interested in hearing about your experiences with DTSC, both positive and negative. Please take a moment to complete a Cal/EPA Customer Survey Form, either on line or by using a printable form.
  • We want to continue to improve our website, and your comments are an important part of doing that. Send your comments and suggestions in an e-mail to the DTSC Web Coordinator at