San Joaquin Valley – Cosumnes
Statistics
- Basin Name
- San Joaquin Valley – Cosumnes
- Basin Number
- 5-022.16
- SGMA Basin Priority
- Medium
- Critically Overdrafted
- No
- Status
- Subject to SGMA
- DWR Region & POC
North Central Region Office
Alison Tang
(916) 376-9631
Alison.Tang@water.ca.gov- Number of Wells
- 3140
- Hydrologic Region Name
- San Joaquin River
- Counties
- Amador, Sacramento
At-A-Glance
Located in California’s San Joaquin River hydrologic region, the San Joaquin Valley – Cosumnes is 210,276 acres in size. This Medium priority basin is home to an estimated 49,560 people (2010 value), which have been at a rate of 12.19. San Joaquin Valley – Cosumnes is a(n) basin with approximately 3140 wells, of which approximately 33 are water supply wells. Groundwater accounts for approximately 86.92 percent of the basin’s water supply.
Basin Notes
2003: Bulletin 118 basin description
2014: CASGEM basin prioritization – medium
2016: Basin boundary modification requests: accepted with Eastern San Joaquin subbasin 5-022.01 and reviewed, one accepted, one denied for Sacramento Valley – South American 5-021.65
Revised basin boundaries description
2018: Draft basin priority – medium. Ground water level comments:
- 1) CASGEM/WDL/GWIDS: Longterm hydrographs show groundwater level decline. Source: DWR 2)
- North San Joaquin Water Conservation District Conjunctive Use Plan – Tracy Lake Groundwater Recharge Project, November 3, 2016 recognizes that Cosumes GWB already in overdraft conditions: “The plan also must address whether and how placing water to underground storage and subsequently withdrawing the water, under Permit 10477 will prevent additional overdraft in the Eastern San Joaquin and Cosumnes groundwater subbasins…”
GSA Information
