Telephone Resources

The following is a directory of potentially useful hotlines and contacts:

DTSC Waste Evaluation Helpline
Operated Monday - Fridays (excluding State holidays) from 8:00 am to 12:00 pm and from 1:00 pm until 5:00 pm. Provides technical assistance to generators and regulators to determine if a material is regulated as a hazardous waste in California.

If you would like to talk to a live person immediately to discuss a waste classification question, please call (916) 327-4499.

Do you have other hazardous waste questions? Contact the Regulatory Assistance Officer Hotline at (800) 728-6942 or (800) 72TOXIC.  If you are calling from out-of-state, you will need to call (916) 255-3617. 

National Institute for Occupational Safety and Health (NIOSH)
1-800-35NIOSH (1-800-356-4674)
Operated Monday through Friday from 8:30 am to 4:30 pm EST. Maintains files on hundreds of hazardous chemicals that may be found in work environments and their current recommended exposure limits.

National Pesticides Telecommunications Network
1-800-858-PEST (1-800-858-7378)
Open 24 hours. Provides information about pesticides to the general public and to the medical, veterinary, and professional communities.

TSCA Assistance Information Service
(202) 554-1404
Operated Monday through Friday from 8:30 am to 5:00 pm EST. Provides information on regulations under the Toxic Substances Control Act and on the USEPA asbestos program.

National Chemical Response and Information Center
In 1985, the Chemical Manufacturers Association established the National Chemical Response and Information Center to provide technical support during chemical emergencies. The center consists of four programs:

  • Chemical Referral Center: 1-800-262-8200
  • Emergency Response Training


CHEMTREC stands for the Chemical Transportation Emergency Center. It was established to provide information and assistance to personnel involved in a chemical emergency.

When a call is placed to the CHEMTREC toll-free hotline, personnel at the center can provide information regarding the nature of a chemical, as well as the hazards and specific response information. In addition, the caller can be put in touch with the shipper for more specific information.

CHEMNET is a mutual aid network between chemical shippers and emergency response contractors who respond when a shipper is unable.

The CMA Chemical Referral Center is a non-emergency number designed to provide a point of contact within the manufacturing company to anyone seeking information on specific chemicals.

Centers for Disease Control
(404) 633-5313.
For technical advice on how to handle an etiologic agent that is damaged or leaking.




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