Islais Valley
Statistics
- Basin Name
- Islais Valley
- Basin Number
- 2-033
- SGMA Basin Priority
- Very Low
- Critically Overdrafted
- No
- Hydrologic Region Name
- San Francisco Bay
- Counties
- San Francisco, San Mateo
- Adjacent Basins
Basin Notes
2003: Bulletin 118 basin description
2014: CASGEM basin prioritization – Very Low
2018: Draft basin priority – Very Low. Groundwater level comments:
- 1) CASGEM/WDL/GWIDS: No data or data insufficent to determine GWL status. Source: DWR
- 2) No available documentation on groundwater level decline past or present in the basin
Salt Intrusion comment: 1) Natural sources of TDS to groundwater in the San Francisco Bay study unit (Marina, Lobos, Downtown, Islais Valley, South San Francisco, Visitacion Valley, Westside, and the Santa Clara Valley groundwater basins ) include saltwater intrusion from the Bay and interaction between recharge water and aquifer materials derived from marine or estuarine sediments. On the east side of the Bay, high and moderate concentrations of TDS were detected in areas with a history of intrusion of water from the Bay in response to pumping of freshwater from aquifers. Source: USGS San Mateo County Office of Sustainability links to groundwater storage and recovery (GSR)
2018 Final Basin Prioritization: Very Low.
At-A-Glance
California Water Library Documents About This Basin
Groundwater Quality in the San Francisco Bay Groundwater Basins, California
U.S. Geological Survey (USGS) | March 29th, 2013
Status and Understanding of Groundwater Quality in the San Francisco Bay Groundwater Basins, 2007: California GAMA Priority Basin Project
U.S. Geological Survey (USGS) | March 29th, 2013
Groundwater quality in the approximately 620-square-mile (1,600-square-kilometer) San Francisco Bay study unit was investigated as part of the Priority Basin Project of t
Geohydrology, Water Quality, and Estimation of Ground-Water Recharge In San Francisco, California, 1987-92
U.S. Geological Survey (USGS) | January 14th, 1993
The city of San Francisco is considering further development of local ground-water resources as a supplemental source of water for potable or non-potable use. By the y