Seaside Groundwater Basin

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The Seaside Groundwater Basin is located below Seaside, Sand City, Del Rey Oaks, Monterey and unincorporated areas of Monterey County, California [1]. There are two main water supply aquifers within the Seaside Basin: Paso Robles and Santa Margarita. There are approximately 37 groundwater wells that extract water from the Seaside Basin. [1]

Water Level and Groundwater Overdraft

Since 1987 the water table has has been dropping with a substantial drop in 1995 when Cal-Am switched its water supply from the Carmel River to the Seaside Groundwater Basin [1]. Cal-Am and MPWMD jointly operate a Storage and Recovery (SAR) project that injects excess flow from the Carmel River into the Seaside Basin during periods of high flow.

Seaside Basin Adjudication

Groundwater Replenishment Project

The Monterey Peninsula Groundwater Replenishment Project aims to replenish groundwater levels to protect Seaside Basin as a water supply source for Cal-Am.



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