TMDL Projects - Clear Lake Nutrient TMDL

Information Regarding the Status of Load Allocations

In 2016, Central Valley Water Board issued 13267 Enforcement Orders to all responsible parties named in the Clear Lake Nutrient TMDL. A 13267 Order is a formal enforcement action that utilizes Water Code Section 13267 authority to require further information or studies from dischargers. The information from the 13267 Order responses was summarized in the Technical Memorandum released in July 2018. As of 2019, Central Valley Water Board staff are in the process of drafting and issuing 13267 Orders to responsible parties that have not demonstrated compliance with the TMDL allocation. This process is meant to address data gaps and estimate the current status of load reductions.


Irrigated Agriculture

Lake County

U.S. Bureau of Land Management (USBLM)

U.S. Forest Service (USFS)

Blue Ribbon Committee for the Rehabilitation of Clear Lake

The Blue Ribbon Committee for the Rehabilitation of Clear Lake, created by Assembly Bill 707 (Aguiar-Curry, Ch. 842, Statutes of 2017), was formed to make recommendations that will rehabilitate and restore Clear Lake. The Committee consists of 15 members, which includes representatives from tribes, UC Davis, the Central Valley Regional Water Quality Control Board, and members appointed by Lake County with expertise in agriculture, economics, environment and public water supplies. The Central Valley Regional Water Quality Control Board representative is Jennifer LaBay. The alternate representative from the Board is previous Board Member Robert Schneider.

More information regarding the Blue Ribbon Committee for the Rehabilitation of Clear Lake, along with Committee documents, is available on the Committee’s website.

Environmental Drivers Study in Clear Lake

The Southern California Coastal Water Research Project Authority (SCCWRPA) has been contracted by the State Water Resources Control Board and the Central Valley Regional Water Quality Control Board to lead a two-year study investigating environmental drivers contributing to cyanobacterial blooms and toxin production in Clear Lake, Lake County. The project will consist of developing and implementing a field study monitoring plan and identifying the specific triggers of cyanotoxin production. The results of this study will be used to develop recommended approaches to manage and mitigate cyanobacterial blooms in Clear Lake and identify next steps for the Clear Lake Nutrient TMDL.

Monitoring for the study has been delayed due to COVID-19 restrictions and is scheduled to begin in August 2020. Documents associated with the contract are available upon request. Please contact Taran Sahota via email at to request any copies of documents associated with the contract.

July 2018 Board Workshop

August 2017 Public Outreach

Available Documents

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