Sacramento Valley – South American
- Basin Name
- Sacramento Valley – South American
- Basin Number
- SGMA Basin Priority
- Critically Overdrafted
- Submitted Alternative to GSP
- DWR Region & POC
North Central Region Office
- Number of Wells
- Hydrologic Region Name
- Sacramento River Hydrologic Region
Located in California’s Sacramento River hydrologic region, the Sacramento Valley – South American is 248,435 acres in size. This High priority basin is home to an estimated 722,780 people (2010 value), which have been at a rate of 25.69. Sacramento Valley – South American is a(n) basin with approximately 4301 wells, of which approximately 277 are water supply wells. Groundwater accounts for approximately 49.53 percent of the basin’s water supply.
2014: CASGEM basin prioritization – high. Comment from B118: Montgomery Watson (1997) listed seven sites within the subbasin with significant GW contamination. From Sac County GWMP: Overall decreasing GW level trend over past 50 years (~30ft).
2016: Basin boundary modification request by Omochumne-Hartnell Water District San Joaquin Valley – Cosumnes subbasin. Per DWR: This request was submitted as both a scientific internal and jurisdictional internal modification. However, the request did not provide necessary scientific information to meet basin boundary definition requirements, therefore it was evaluated solely as a jurisdictional modification. Based on Sacramento County comment the modification request was denied. Border change noted as part of Yolo County boundary modification.
Sacramento County GSP alternative proposal.
2018: Draft basin priority – high. Comments: 1) CASGEM/WDL/GWIDS: Longterm hydrographs show groundwater level decline. Source: DWR 2) Sacramento Central Groundwater Authority Groundwater Elevation Monitoring Plan CASGEM monitoring plan (February 2012) states in that the intensive use of the groundwater basin has resulted in a general lowering of groundwater elevations near the center (or centroid) of the basin away from the sources of recharge.
Basin boundary modification request to create a new subbasin in the northern portion of the Delta involving the Solano subbasin 5-021.66 and Eastern San Joaquin Valley subbasin 5-022.01 pending with DWR.