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California Notice 2011-02: Public Hearing Pertaining To Hexazinone Detections In Ground Water
(May 2011)

A public meeting was held to discuss hexazinone detection in ground water on June 7, 2011 at 9am PT at Cal-EPA located in the Sierra Hearing Room, 1001 I Street, 2nd Floor in Sacramento, CA.

The California Department of Pesticide Regulation (DPR), a department of the California Environmental Protection Agency, hosted a hearing on May 9 to evaluate hexazinone, a pesticide that has been found in the state’s ground water. The hearing helped determine if the agricultural use for the chemical can continue, and, if so, under what conditions.

The California Department of Pesticide Regulation determined that the source of the ground water residues was from the use of the pesticide on alfalfa. A three-member subcommittee will review the evidence presented at the hearing to determine whether:

1) The ingredient found in ground water has not polluted, and does not threaten to pollute, the state’s ground water
2) The agricultural use of the pesticide can be modified so that there is a high probability that the pesticide would not pollute the state’s ground water
3) Modification of the agricultural use of the pesticide or cancellation of the pesticide will cause severe economic hardship on the state’s agricultural
industry, and that no alternative products or practices can be effectively used so that there is a high probability that pollution of the state’s ground water
will not occur

The subcommittee will then submit a report to Mary-Ann Warmerdam, DPR director. Within 30 days of that report, Warmerdam will issue a decision regarding the continued use of the pesticide. If none of the above findings are made, the product registrations may be subject to cancellation.

For the latest information, visit the page on DPR’s website at

Update: The purpose of the public meeting is to hear additional information from state scientists about hexazinone use patterns, toxicology, alternatives and mitigation options for the purpose of determining whether the agricultural use of hexazinone should continue, and if so, under what conditions.

Meeting Agenda:
1. Opening remarks
2. Toxicology
3. Hexazinone agricultural use product labels
4. Hexazinone detections, use patterns and co-occurrence with other pesticides
5. Mitigation options and modeling
6. Hexazinone alternatives

This meeting will also be webcast live to the public and can be viewed at:  http://www.cdpr.ca.gov/docs/emon/grndwtr/hexazinone.htm

For more information, please Contact TSG.
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