Skip to Main Navigation
Skip to Page Content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Nomination Summary for TCAB and TCAOB in drinking water (N91010)

Nominated Substances: 3,3',4,4'-Tetrachloroazobenzene, 3,3',4,4'-Tetrachloroazoxybenzene

Nomination Date: 02/00/1988

Nominator: EPA

Rationale: Contaminants in herbicides; EPA Office of Drinking Water will use NTP data to determine need for regulation.

NTP Principles: Pre 1993 - 3, 8

Agents and Status

The following information relates to the specific agent and may include history from earlier or later nominations for this same agent.

CASRN: 14047-09-7

Agent Name: 3,3',4,4'-Tetrachloroazobenzene

CASRN: 21232-47-3

Agent Name: 3,3',4,4'-Tetrachloroazoxybenzene