CCWD Project Notices

Notice of Aquatic Vegetation Management for 2014
The State Water Resources Control Board’s Statewide General National Pollutant Discharge Elimination System (NPDES) Permit for Residual Aquatic Pesticide Discharges to Waters of the United States from Algae and Aquatic Weed Control Applications regulates the application of products to manage aquatic vegetation.

Under the permit’s Public Notice Requirements, the Contra Costa Water District has the following obligation:“Every calendar year, prior to the first application of aquatic pesticides, the discharger shall notify potentially affected governmental agencies.”

This letter serves to meet a portion of the Public Notice Requirements of the permit.

In accordance with the provisions of the permit, CCWD will be applying the U.S. EPA registered products to manage aquatic vegetation listed below. The active ingredients for the respective products are listed in parenthesis:
  • Aquamaster (glyphosate)
  • Clearigate (chelated copper)
  • Cutrine Plus (chelated copper)
  • Cutrine Ultra (chelated copper)
  • Green Clean (hydrogen dioxide, and peroxyacetic acid)
  • Harpoon Granular (copper ethylenediamine)
  • Komeen (copper ethylenediamine)
  • Nautique (copper)
  • Sonar (fluridone)
These products will be used to control aquatic species such as, water hyacinth, Egeria densa, and various other algae. If left uncontrolled, these aquatic vegetation impact water treatment processes and can also impact operations by clogging pumps and filters.

CCWD only applies products when absolutely necessary. The District is continually evaluating and using more environmentally friendly alternatives under its Integrated Pest Management Program. Through these alternatives, CCWD has been able to reduce use of aquatic pesticides by nearly 40 percent.

CCWD’s treatments historically occur from the spring to early winter. However, climatic and source water conditions greatly influence aquatic vegetation growth. As such, there have been times where CCWD has applied products outside of this historical time frame.

The District's treatment area consists of the untreated water conveyance and storage system. This system consists of the 48-mile long Contra Costa Canal (JPG), and the Los Vaqueros, Contra Loma, Mallard, and Martinez Reservoirs.

CCWD has a solid track record in the safe use of these products. CCWD commits to effectively operating under the provisions of the permit without detriment to your agency, its operations, or the environment.

Currently, the only use restriction during treatment activities is in the use of copper-containing products, which may affect water treatment plant operations using ozone disinfection. CCWD’s practice is to notify water treatment plants using ozone disinfection in advance of its treatment activities. There are also restrictions and provisions that apply to treatments in the unlined portion of the Contra Costa Canal. These provisions are in place to comply with the Endangered Species Act (ESA). The Bureau of Reclamation and CCWD work with the oversight agencies to proceed with treatments in this portion of the canal in compliance with the ESA.

CCWD has been responsibly applying and monitoring for the effects and presence of aquatic pesticides for over 35 years. The District will continue to do so under the provisions of the permit and in compliance with the ESA.

Should you have any questions or comments, please contact Mr. David Omoto at 925-688-8023.