Winery Waste Discharge Requirements (WDRs)

Any winery that does not qualify or did not apply, to remain regulated under the Napa County Winery Waste Discharge Program, will be required to apply to the state by their January 2024 deadline. All winery facilities are being contacted by the State of California regarding the new order. If you received their letter, please keep the letter for future reference.

The Napa County deadline has passed. Applications are no longer being accepted.

If your facility is approved to remain in the Napa County discharge program, you must continue to demonstrate compliance* to remain in the program. Please keep in mind, your facility must already have a process waste discharge permit with Napa County to be eligible for continued coverage. If you have questions, please contact us at [email protected].

* Enrollees in Napa County's Winery Waste Discharge Program must remain in compliance with the current discharge and reporting requirements. Facilities with above ground discharge shall report quarterly (every 3 months) through the website. Facilities with below ground discharge shall be serviced every six months by a qualified service provider and shall submit reports twice a year (every 6 months) through the website (typically, the service provider for the below ground facilities will fill out the OnlineRME report, however, it is still the responsibility of the facility to ensure Napa County is receiving these reports).

Wineries that do not have a current enrollment in the Napa County Winery Waste Discharge Program are not eligible for continuation and will be required to enroll in the new Statewide General Winery Discharge Program by January 20, 2024. For more information visit the State Water Board site.  


On January 20, 2021, the State Water Resources Control board adopted Resolution No. 2021-0001 for the California Environmental Quality Act Mitigated Negative Declaration for the Waste Discharge Requirements for Winery Process Water and associated General Order. The State Water Board has developed General Waste Discharge Requirements (WDRs), through adoption of Winery Order No. WQ 2021-0002-DWQ, for wineries and other similar facilities with activities related to producing wine that generate winery waste and discharge it to land for reuse or disposal. The ("Winery Order") is a set of requirements that protect water quality from the potential impacts of discharging winery waste to land. 

Winemaking generates process water that has the potential to degrade groundwater quality depending on winery-specific activities, size, and treatment processes. The primary concerns for winery process water that effects groundwater quality are nitrogen, salinity, and biochemical oxygen demand. The Winery Order is applicable statewide and includes requirements to ensure winery operations effectively mitigate adverse impacts to water quality.  This requires wineries producing 10,000 gallons or more per year of process waste that discharges to the land (surface or subsurface), without a separate WDR through Napa County, to enroll in the new Statewide General Winery Discharge by January 20, 2024.