Seawater Intrusion Contour Maps

Summary

The Monterey County Water Resources Agency has released its 2025 Seawater Intrusion Contour Maps, which show the extent of seawater intrusion in the Salinas Valley Groundwater Basin. The maps indicate that the 500 mg/L chloride isocontour has advanced slightly in the 180-Foot Aquifer, while there was no advancement in the 400-Foot Aquifer. The Agency has identified areas that warrant additional focus in the coming year, including a seawater intrusion review area in the 400-Foot Aquifer. The report provides an overview of the data collection and analysis process, as well as the results of the mapping efforts.

Details

Subject

Seawater Intrusion Contour Maps

Summary

The Monterey County Water Resources Agency has released its 2025 Seawater Intrusion Contour Maps, which show the extent of seawater intrusion in the Salinas Valley Groundwater Basin. The maps indicate that the 500 mg/L chloride isocontour has advanced slightly in the 180-Foot Aquifer, while there was no advancement in the 400-Foot Aquifer. The Agency has identified areas that warrant additional focus in the coming year, including a seawater intrusion review area in the 400-Foot Aquifer. The report provides an overview of the data collection and analysis process, as well as the results of the mapping efforts.

Report Date

2026-03-20

Report Type

study

Report Title

Review of the 2025 Seawater Intrusion Contour Maps

Authoring Body

Monterey County Water Resources Agency

Reporting Period

2025