What is seawater intrusion? Learn how seawater intrusion occurs in the aquifers near the coast of Capitola, Aptos and La Selva Beach. This is why Soquel Creek Water District has developed a Community Water Plan that includes water conservation, proactive groundwater management and securing a supplemental water supply to aid in replenishing the groundwater basin. Visit our website at: http://www.soquelcreekwater.org/ourw... to learn more.