Skip to Content
Questions or Comments: tox@tceq.texas.gov

About TCEQ Development Support Documents (DSDs) for Effects Screening Levels (ESLs) and Air Monitoring Comparison Values (AMCVs)

A Development Support Document summarizes how chemical-specific toxicity values were derived based on published guidelines (RG-442).


NEWTCEQ Toxicology News: A 90-day Public Comment Period Has Begun!

A Development Support Document (DSD) summarizes how chemical-specific toxicity values were derived based on RG-442, Guidelines to Develop Effects Screening Levels, Reference Values, and Unit Risk Factors.

A proposed DSD is published at the TCEQ web site for a 90-day public review and comment period. After public comments are received, the TD will address and resolve all relevant issues and make scientifically defensible changes to the DSD and toxicity values, if needed.

The final DSDs with a Response to Comments, if applicable, are then published on the TCEQ website. Registrants on the Toxicology Announcement List will be notified by e-mail when proposed or final DSDs are posted.

Current Public Comment Period

A 90-day public comment period (ending January 12, 2024) has begun for the Carbon Tetrachloride Proposed DSD.

NEWView the DSD: Carbon Tetrachloride Proposed DSD

How To Submit Comments:

e-mail: tox@tceq.texas.gov or mail (must be received at the TCEQ no later than 01/12/2024) to:

Regular mail:

Toxicology Division, MC 168

Texas Commission on Environmental Quality

P.O. Box 13087

Austin, TX 78711-3087

Mail delivery services:

Toxicology Division, MC 168

Texas Commission on Environmental Quality

12100 Park 35 Circle, Bldg. F

Austin, TX 78753

Sign Up to Receive ESL List, AMCV List, and Other Related Toxicology Announcements

For instructions on how to join the Toxicology Announcement List, click here.