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Please use the form below to send us comments or questions. Be sure to include your e-mail address if you’d like a response.

Since the EPA Dioxin website centers around the IRIS assessment for 2,3,7,8-Tetrachlorodibenzo-p-dioxin, we are directing questions about this chemical to the USEPA IRIS Hotline. You can request assistance by telephone at (202) 566-1676, by email at hotline.iris@epa.gov, by using the comment form below, or by writing to:

IRIS Hotline
c/o EPA Docket Center, Mail Code 28221T
EPA-West Building
1301 Constitution Avenue NW
Washington, DC 20005

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