3. Lowering of groundwater levels could temporarily reduce or halt the production potential of an unknown number of water supply wells; however, assuming the distribution of lower groundwater levels is distributed across the Basin, the magnitude of reduced groundwater levels would be lessened, and the number of temporarily-impacted wells would likely be manageable.
Note that this discussion applies to the OCWD portion of the groundwater basin. Storage conditions in the La Habra-Brea Management Area are separate.
OCWD uses a large network of wells to obtain water levels in June every year, including:
1. OCWD owned wells (including multi-port monitoring wells) 2. Groundwater producer wells (must be turned off for 24 hours in advance) 3. Selected wells in Geotracker
The wells/monitoring points used for the June 2021 contour maps of the Shallow, Principal and Deep Aquifers are attached. For 2021, 350 wells/monitoring points were used for the Shallow Aquifer, 421 wells/monitoring points for the Principal Aquifer, and 61 wells/monitoring points for the Deep Aquifer. There may be small changes in this well/monitoring point list on an annual basis.
Appendix F - 286
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