Reports & Data

The State Water Resources Control Board adopted the 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, Water Quality Order 2013-0002-DWQ, for the reissuance of General NPDES Permit CAG990005 in June 2013. Order 2013-0002-DWQ became effective on December 1, 2013. This General Permit covers only discharges of algaecides, and aquatic herbicides that are currently registered for use in California, or that become registered for use and contain the above-listed active ingredients and ingredients represented by the surrogate of nonylphenol.  In addition to the pesticides permitted under the state permit, the County Department of Agriculture Weed Commissioner and the California Department of Food and Agriculture can also implement pesticide restrictions for Lake County including Clear Lake.

Under the permit requirements, the permittee (Lake County Water Resources) is required to conduct water quality monitoring and permit tracking.  This information is collected, reviewed, and summarized each year in an annual report.   These reports are submitted to the Water Boards on an annual basis and can be found online at the California Integrated Water Quality System Project(CIWQS) Lake County – Pesticides Reporting Page.

The annual reports are available here:

2017 Report
2018 Report
2019 Report

2020 Report

More information on the NPDES Program can be found here.

Please note that Electronic Self Reporting is not available for NPDES Pesticide programs at this time.  Please contact the Lake County Invasive Species Coordinator, Angela De Palma-Dow at [email protected] or (707)263-2344, if you would like more information or to receive raw data from this program.