Half Moon Bay Terrace
Statistics
- Basin Name
- Half Moon Bay Terrace
- Basin Number
- 2-022
- SGMA Basin Priority
- Very Low
- Critically Overdrafted
- No
- Hydrologic Region Name
- San Francisco Bay
- Counties
- San Mateo
- Adjacent Basins
-
No items found
Basin Notes
2003: Bulletin 118 basin description
2018: Basin draft prioritization moved Half Moon Bay from low to high priority, subjecting it to SGMA. Salt intrusion comment:
- Based on water balance results, the Phase II study concludes the following: a) the Midcoast aquifers have a considerable groundwater surplus in above average rainfall years but can have a deficit in dry and very dry years; b) the marine terrace subareas appear to be in long-term hydrologic balance and should remain in long-term balance with a moderate increase in water extractions; c) current pumping rates have lowered the water table to near sea level during dry years, and potentially below sea level during very dry years, posing risks of saltwater intrusion; and, d) increased pumping over long periods of time, especially during drier years, will increase the amount of time that the water table falls near or below sea level; and this increases the risk of saltwater intrusion. Source: Midcoast Groundwater Phase III, San Mateo County, CA
Comment on reprioritization by the County of San Mateo, City of Half Moon Bay, and Montara Water and Sanitary District
2018 Final Basin Prioritization: Very Low Priority.
At-A-Glance
Source: CA DWR
California Water Library Documents About This Basin
Midcoast Groundwater Study Phase III, San Mateo County, California
San Mateo County | June 4th, 2010
San Mateo County ‘Midcoast’ extends from northern Half Moon Bay to Devils Slide along Highway 1. It encompasses the communities of Montara, Moss Beach, Seal Cove, Pri