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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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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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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Need Assistance?

If you can’t find the information you’re looking for or the answer to your question, or you want to walk through regulatory requirements with a live person, our Regulatory Assistance Officers are able to help. Call (800) 72TOXIC (800-728-6942). From outside California, call (916) 324-2439. Don’t be discouraged by getting voice mail – you will hear from an officer within 2 to 3 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