Sacramento Valley – South Yuba

Statistics

Basin Name

Basin Number

5-021.61

SGMA Basin Priority

High

Critically Overdrafted

Hydrologic Region Name

Sacramento River

Counties

Yuba

Adjacent Basins

Sacramento Valley - North Yuba 5-021.60, Sacramento Valley - North American 5-021.64, Sacramento Valley - Sutter 5-021.62,

At-A-Glance

Located in California’s Sacramento River hydrologic region, the Sacramento Valley – South Yuba subbasin is 109,020.31 acres in size. This High priority basin is home to an estimated 44,990 people (2010 value). It has approximately 1337 wells, of which approximately 47 are water supply wells. Groundwater accounts for approximately 40 percent of the basin’s water supply.

Source: CA DWR

2003: Bulletin 118 basin description

2014: CASGEM prioritization: medium.

2016: Boundary modified with North American 5-021.64 subbasin

2018: Draft Basin Prioritization – high. Comments: 1) CASGEM/WDL/GWIDS: Stable hydrographs. Source: DWR 2) Began using surface water in 1981 to mitigate previous declining groundwater levels; gwls have now recovered. Partly in response to this water table decline, the YCWA began to provide Yuba River water to Brophy Water District and South Yuba Water District in 1983. Monitoring indicates groundwater levels have recovered since the early 1980s. Currently both the Yuba North Subbasin and the Yuba South Subbasin are in good health. Source: Yuba County Water Supply Assessment, Magnolia Ranch DEIR, 2015 Priority set high because of inter-basin water transfers. Groundwater-related transfer “Type A” in which local groundwater is pumped to compensate for diverted surface water. 2019: Basin boundary modification. Per DWR: “The first portion of the basin boundary modification is an external scientific revision to the eastern boundary of the North Yuba subbasin. The boundary utilizes a qualified map and follows geologic contacts of alluvial deposits and consolidated rocks of the Sierra Nevada. The second portion of the modification consists of two internal jurisdictional revisions. This first modifies the boundary between the South Yuba, North American, and Sutter subbasins to align with the Yuba County line and include Dry Creek Mutual Water Company’s jurisdictional boundary within the South Yuba subbasin. The second modifies the boundary between the North Yuba and Wyandotte Creek subbasins to follow and include the jurisdictional boundary of the Ramirez Water District within the North Yuba subbasin.” Draft phase 2 priority: high. December 27,

2019: December 27 – Yuba Water Agency published its Groundwater Sustainability Plan

2020: January 30 – GSP submitted to DWR

2021: November 18 — GSP approved by DWR