Department of Toxic Substances Control Department of Toxic Substances Control

Reactivating an ID Number

How do I reactivate my existing ID number?

ID numbers become inactive for multiple reasons. The most common reason is failure to respond to the ID number verification questionnaire by the deadline in the notice that is sent to all handlers. It is a simple process to reactivate a number. Additionally, some companies choose to inactivate their number, and later need to reactivate it.

NOTE: Temporary numbers CANNOT be reactivated.

Please choose which type of number you have:

I have a State ID Number I have an EPA ID Number

I don't know what type of ID number I have

The first two or three characters in your ID number determine the type of ID number you have:

  • Federal EPA ID number: CAR, CA, CAD, CAT, CAP
  • State ID number: CAL, CAC, CAD, CAH, CAI, CAE, CAF, CAS, CLU, CAX, CA99

For a more detailed discussion of these prefixes and their meaning, please refer to our fact sheet, EPA Identification Numbers for Generators.

I still have questions. Who can I talk to?

Please call our ID number help line at 800-618-6942 for other questions.