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Reevaluation
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PyrethroidsDPR placed certain pesticide products containing pyrethroids into reevaluation on August 31, 2006. The reevaluation is based on recent monitoring surveys and toxicity studies revealing the widespread presence of synthetic pyrethroid residues in the sediment of both agricultural and urban dominated California waterways at levels toxic to Hyalella azteca (H. azteca). Scientists conducted sediment bioassays using H. azteca, a resident species found in some Central Valley water bodies. Scientists commonly use H. azteca, an aquatic crustacean, as an indicator of environmental health and water quality in streams, lakes, and other bodies of water. Significant toxicity was observed at numerous sites. There was a high correlation between concentrations of pyrethroids and observed toxicity. Findings further indicate that the unique physical, chemical, and toxicological properties of the pyrethroid class of chemicals contribute to their propensity to accumulate in sediment at toxic levels. Pyrethroids are synthetic insecticides. Pyrethrins, which are natural insecticides, are found in Chrysanthemum cinerariaefolium, a perennial plant with a daisy-like appearance. DPR did not include pesticide products containing naturally occurring pyrethrins in this reevaluation because pyrethrins are known to break down rapidly in the environment.
- Reevaluation notice (PDF, 60 kb)
- Summary chart of active ingredient specific data requirements (PDF, 110 kb)
- List of products included in reevaluation (PDF, 136 kb)
- List of documents related to the pyrethroid reevaluation
- Frequently Asked Questions (PDF, 135 kb)
- Pyrethroid Forum (April 30, 2007) - Agenda and presentations
- Agenda (PDF, 25 kb)
- Urban Consumer Use Patterns; Off-Site Movement Potential; Mitigation/Optimization Martinez, R. (PDF, 524 kb)
- Protecting Water Quality: The Federal and State Clean Water Mandates to Prevent Pesticide Toxicity and the California Water Boards’ Role Mumley, T., Karkoski, J. (PDF, 725 kb)
- Pesticides Pose Compliance
Challenges for Urban Runoff Permittees Brosseau, G. (PDF, 388 kb)
- Stormwater Flow Chart (PDF, 18kb)
- Pyrethroid Problem Formulation Overview Poletika, N. (PDF, 178 kb)
- Pyrethroids Residential and Consumer Products Use in California Assaf, N. (PDF, 237 kb)
- POTWs and the Regulatory World: Pesticides
Bobel, P., Moran, K., Weir, C. (PDF, 1.2 MB)
- Wastewater Flow Chart (PDF, 19 kb)
- Environmental Fate and Aquatic Toxicology of the Synthetic Pyrethroids Dobbs, M., Warinton, J., Giddings, J.M., Hendley, P., Lam, C. (PDF, 338 kb)
- Registration and Re-evaluation of Pyrethroids, Pyrethrins, and Synergist (PPS) Chemicals (U.S. EPA)Pyrethroids, Pyrethrins, and Synergist (PPS) Chemicals Guerry, J. (PDF, 72 kb)
- Urban and Agriculture Prioritization for DPR’s Reevaluation of Pyrethroids Jones, R., Markle, J., Hendley, P., Poletika, N., Assaf, N., Mitchell, G., Dobbs, M., Kohne, S. (PDF, 453 kb)
- Overview of Stormwater-Related Scientific Issues and Resources Moran, K. (PDF, 934 kb)
- PCOC: CA Industry Perspective Van Steenwyk, D. (PDF, 55 kb)
FOR CONTENT QUESTIONS, CONTACT:
Denise Webster
1001 I Street, P.O. Box 4015
Sacramento, CA 95812
Phone: (916) 324-3522
E-mail: dwebster@cdpr.ca.gov