Office Addresses and Phone Numbers

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

Physical Address:
1001 I Street
Sacramento, CA 95814-2828
Google Map (opens new window)

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 (opens new window)
Fax: (510) 540-3738
Google Map (opens new window)

Clovis Field Office

1515 Tollhouse Road
Clovis, CA 93611-0522
Phone: (559) 297-3903 (opens new window)
Fax: (559) 297-3904
Google Map (opens new window)

Cypress Regional Office

5796 Corporate Avenue
Cypress, CA 90630-4732
Phone: (714) 484-5300 (opens new window)
Fax: (714) 484-5302
Google Map (opens new window)

Pasadena Environmental Chemistry Laboratory

757 S. Raymond Avenue, Ste. 105
Pasadena, CA 91105
Phone: (626) 304-7801 (opens new window)
Fax: (626) 304-4803
Google Map (opens new window)

San Diego Field Office

2375 Northside Drive, Ste. 100
San Diego, CA 92108
Phone: (619) 516-1982/1983 (opens new window)
Fax: (619) 516-1963
Google Map (opens new window)


Berkeley Environmental Chemistry Laboratory

700 Heinz Avenue Suite 100
Berkeley, CA 94710-2721
Phone: (510) 540-3003 (opens new window)
Fax: (510) 540-3615
Google Map (opens new window)

Chatsworth Regional Office

9211 Oakdale Avenue
Chatsworth, CA 91311-6505
Phone: (818) 717-6500 (opens new window)
Google Map (opens new window)


Commerce Regional Office

6119 E. Washington Blvd., #120
Commerce, CA 90040
Google Map (opens new window)


Imperial County CUPA Office

627 Wake Avenue
El Centro, CA 92243
Phone: (760) 352-0381 (opens new window)
Fax: (760) 352-1641
Google Map (opens new window)

Sacramento Regional Office - Cal Center

8800 Cal Center Drive
Sacramento, CA 95826-3200
Phone: (916) 255-3545 (opens new window)
Fax: (916) 255-3785
Google Map (opens new window)

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 (opens new window) or (800) 728-6942) (opens new window). From outside California, call (916) 324-2439 (opens new window). 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 (opens new window), 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