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Seawater Barriers

The Los Angeles County Department of Public Works operates and maintains three seawater barriers along Los Angeles County’s coastline. Often unnoticed because of their underground nature, these facilities serve as Los Angeles basin’s fresh water sentinels. They protect a significant portion of the area’s drinking water supply from ocean water, which constantly attempts to migrate into existing aquifers. Treated imported and reclaimed water is injected deep into the underground aquifers to block this inland migration of saltwater.

General mapping use

Supplemental Information:
Water Resources is a Division of the Los Angeles County Department of Public Works. Please visit their website for posted publications and for more information on seawater barriers.

Water Resources Home Page

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Data Field Descriptions

GIS Source Information
Database Name:
Feature Class Name:
Feature Dataset Name (if applicable):
Reference Date: 2002
Accuracy: Parcel
Update Frequency: As Needed
Access Constraints:None

Contact Information
Francis Calasanz

County of Los Angeles
Department of Public Works
Survey/Mapping and Property Management Division
900 S. Fremont Ave
Alhambra, CA 91803

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