Copper Antifouling Paints
On June 1, 2010, the Department of Pesticide Regulation (DPR) placed into reevaluation certain pesticide products containing the active ingredients copper oxide, copper hydroxide and cuprous thiocyanate and intended for use as antifouling paint (AFP) pesticides.
Copper AFP pesticides are used in the form of a paint to protect against the accumulation of barnacles, etc. on the underwater surfaces of boats and ships. DPR initiates this reevaluation based on findings from a June 2009, DPR report titled, “Monitoring for Indicators of Antifouling Paint Pollution in California Marinas.” The report indicates that dissolved copper concentrations in more than half the water samples taken from salt and brackish water marinas exceeded the California Toxics Rule (CTR) chronic water quality standard for copper. Dissolved copper concentrations in about a third of the water samples in these marinas also exceeded the acute standard. Several other marina surveys of Southern California coastal marinas produced similar findings.
- Reevaluation notice, PDF (45 kb)
- List of products included in reevaluation, PDF (39 kb)
- Example letter to registrants (June 3, 2010), PDF (75 kb)
- Example letter to registrants (March 23, 2011), PDF (79 kb) - Example letter to registrants providing clarification and establishing additional data requirement
- Environmental Monitoring Report, Monitoring for Indicators of Antifouling Paint Pollution in California Marinas, PDF (2.3 mb) (June 2009). Appendices, PDF (9.8 mb)
- In-Water Hull Cleaning Study, Life Cycle Contributions of Copper from Vessel Painting and Maintenance Activities, Biofouling: The Journal of Bioadhesion and Biofilm Research, Nov. 2013.
- AB 425 (Atkins), DPR Letter – Copper antifouling paints (February 14, 2014), PDF (104 kb)
- List of Copper Antifoulant Paints by Leach Rate Category, PDF (225 kb)
For content questions, contact:
1001 I Street, P. O. Box 4015
Sacramento, CA 95812-4015
Phone: (916) 324-3522