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Regional San Wastewater Treatment Plant Upgrade Conceptual Model and Management Needs Workshop

Workshop surveys


Workshop presentations


Please click here to access the REVISED meeting notice.


Visit the links below to access more information related to this public workshop:


Friday, May 18, 2018
9:15 am – 4:00 pm PDT


UC Davis Extension Sutter Square Galleria

2901 K Street, Sacramento, CA 95816


The Delta Science Program is funding a set of studies to assess the current state of nutrients, aquatic vegetation, and the food web in areas that may be affected by the changes in nutrient loading by the Sacramento Regional County Sanitation District (Regional San) wastewater treatment plant (WWTP) upgrade. The Sacramento Regional County Sanitation District (Regional San) is currently constructing new treatment facilities at the Sacramento Regional Wastewater Treatment Plant (SRWTP), called the EchoWater Project, at a cost of approximately $1.5 B, which are due to be operational in 2021. These upgrades will dramatically reduce total nitrogen levels and alter the concentrations of different forms of nitrogen in the Sacramento River. As a sub-component of the upgrade coming online, the nutrient composition of the treated wastewater effluent may be reduced, but there are not fixed compliance dates for these interim steps.


To understand what effects these changes may have on the Delta ecosystem, a baseline needs to be established. The Delta Science Program funded a suite of pilot studies and a conceptual model framework effort known as the “Operation Baseline” initiative. These studies lay the groundwork to enable comparisons between present and future conditions. However, many important science needs are unknown or not funded at this time.


As part of the Operation Baseline initiative, a draft conceptual model framework has been developed to describe key science needs. The authors and the Delta Science Program is requesting input from the Delta science and management community on the draft conceptual model framework at this public workshop. Please join us as we discuss research needs related to the upgrade of the WWTP and work to identify the high priority science in an interactive public workshop format. 

Coequal goals

The Delta Stewardship Council was created in legislation to achieve the state mandated coequal goals for the Delta. "'Coequal goals' means the two goals of providing a more reliable water supply for California and protecting, restoring, and enhancing the Delta ecosystem. The coequal goals shall be achieved in a manner that protects and enhances the unique cultural, recreational, natural resource, and agricultural values of the Delta as an evolving place." (CA Water Code §85054)