New Nitrate and Salt Regulations for Agriculture in 2020

New Nitrate and Salt Regulations for Agriculture in 2020

In 2020, the Central Valley Regional Water Quality Control Board will begin implementing strict new requirements for the discharge of nitrate and salt from agriculture. After more than a decade in development, the CV-Salts Basin Plan Amendment will make two important changes to all Waste Discharge Requirements (WDR’s) under which all surface and groundwater discharges fall. Here is a link to a comprehensive summary of the changes and helpful maps


Nitrate discharges that contribute to an exceedance of water quality standards will need to be significantly reduced and residence whose water exceeds the standards will need to have their water supply replaced. The Regional Board has adopted a prioritized approach with Priority 1 basins found largely in the San Joaquin Valley. Ag in those areas, will need to join regional management zones to plan and fund replacement drinking water. Priority 2 areas, which include Yolo County, will follow the same path in the next 3-5 years. 


Salinity discharges will also face additional regulatory burdens. Ag and other dischargers will need to participate in a 10-year study to evaluate salt loading and develop plans to significantly reduce impact on ground and surface water. In the alternate, discharges will need to prove that they do not exceed salinity standards as a result of their operations, a very difficult standard for irrigated agriculture.

What this means for rice

The good news is the impact on rice should be narrow. The anaerobic nature of rice production limits the conversion of fertilizer to nitrate and water does not move well through our heavy clay soils. As discussions convene in the Priority 2 area in Yolo County, we will work with the Sac Valley Water Quality Coalition and other dischargers to educate them on rice and understand proposed replacement water solutions. For salinity, we will participate in the 10-year study to help craft the long term solution. 

What this means for the Sacramento Valley

If you grow crops other than rice in the Sacramento Valley, you will need to be on the lookout for the development of Best Management Practices (BMP’s) to reduce nitrate loading. Also pay close attention to changes in projected degradation of water quality over the next 20 years and where you farm. Finally, the Sac Valley Coalition is still evaluating its approach to addressing salinity. 

More WDR Stories

sunset over the rice fields

Drinking Water Supply Well Monitoring goes Online

Drinking water supply well monitoring is a new regulatory requirement for Sacramento Valley growers/landowners starting January 1, 2022. Rice growers in the Sacramento Valley are automatically members of the Sacramento Valley Rice Growers Coalition, with the requirement specific to wells that supply drinking water on parcels where rice is produced. Drinking water supply wells on non-rice parcels receive coverage under the Sacramento River Watershed Coalition. Rice grown in the San Joaquin Valley starts earlier and growers/landowners are directed to the local water quality coalition.*

sunset over the rice fields

Grower Reporting Requirements for WDR Orders

This is the time of year we receive calls asking where to report Farm Evaluations and various other information for the Waste Discharge Requirements (WDR) Order. The WDR Orders were amended in 2018, resulting in changes to the grower reporting requirements. A table listing side-by-side requirements with the Rice WDR and the Sacramento River Watershed WDR, the coalition for non-rice crops, is our effort to provide you with timely information.