In the 1970s, California’s Niles Cone groundwater basin needed protection from saltwater intrusion, so a water district began routing creek water into former gravel pits; 13 pits spanning roughly 300 acres now help recharge the aquifer

The Alameda County Water District has ingeniously repurposed old gravel pits in Fremont into vital groundwater recharge sites. Launched in the early 1970s, this program addresses the pressing issue of saltwater intrusion from San Francisco Bay into local freshwater supplies. Ongoing research demonstrates the efficient movement of recharge water through aquifers, while diligent monitoring continues to ensure groundwater quality amid previous saltwater contamination challenges.
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