Central Valley TMDL Projects
Pesticide TMDL and Basin Plan Amendment

On 28 March 2014, the Central Valley Water Board adopted Resolution R5-2014-0041; adopting the Amendment to the Water Quality Control Plan for the Sacramento River and San Joaquin River Basins for The Control of Diazinon and Chlorpyrifos Discharges (Amendment) and approving the supporting Substitute Environmental Documentation and Staff Report. The Amendment establishes water quality objectives and implementation and monitoring requirements to protect water bodies in the Sacramento and San Joaquin Valleys from impairment due to discharges of diazinon and chlorpyrifos associated with uses of these pesticides in agricultural operations and in urban areas. The goal of the Amendment is to reduce diazinon and chlorpyrifos concentrations in Sacramento and San Joaquin Valley water bodies to levels that are protective of aquatic life (WARM and/or COLD) beneficial uses. This Amendment was approved by the State Water Resources Control Board on 16 June 2015, the Office of Administrative Law on 8 March 2017, and USEPA on 16 August 2017. The Amendment is now fully approved and effective 16 August 2017.

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