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STATE OF CALIFORNIA
PUBLIC UTILITIES COMMISSION

Monterey Peninsula Water Supply Project

(Application A.12-04-019, filed April 23, 2012)

This page was last updated: 08/06/2026

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Construction Status and Mitigation Monitoring

Construction Status

Construction of the Monterey Peninsula Water Supply Project began in September 2019, and continued through April 2022. This initial phase consisted of the construction of 5,300 linear feet of Treated Water pipeline (also known as Transmission Main) for conveyance of desalinated water, in the City of Seaside, the Ryan Ranch-Bishop Interconnection Improvements, and the Carmel Valley Pump Station.

Future phases will include construction of Marina Pipeline, construction of the Desalination Plant in unincorporated Monterey County, and additional Transmission Main construction in the City of Marina and on U.S. Army lands. Construction of the Desalination Plant is expected to start in August 2026. Construction of the entire MPWSP is estimated to be completed by the end of 2028.

Mitigation Monitoring Compliance, and Reporting Plan (MMCRP)

The MMCRP is available here.

Mitigation Compliance Plans and Other Documents

CalAm has completed final engineering and the preparation of compliance plans and additional documents required for construction. The plans describe specific actions to be taken by CalAm and its contractors to meet requirements of mitigation measures contained in the MMCRP. Final plans approved to date are available here. Additional plans will be posted as they become final.

Notices to Proceed

Notices to Proceed (NTPs) were reviewed and issued by the CPUC, by MPWSP phase, as requested by CalAm. Issuance of NTPs was contingent upon CalAm’s compliance with pre-construction requirements as specified by the approved mitigation measures. A summary of the NTPs issued by the CPUC is provided below.

NTP No. Description Status
1 Transmission Main (City of Seaside/non-Army lands) Issued September 13, 2019
2 Ryan Ranch-Bishop Interconnection Improvements Issued February 3, 2020
3 Carmel Valley Pump Station Issued June 8, 2020
4 Marina Pipeline Under CPUC Review
5 Desalination Plant (Phase 1) Issued September 14, 2025
6 Desalination Plant (Phase 2) Under CPUC Review

Weekly Monitoring Reports

CPUC Environmental Monitors are in the field to verify the proper implementation of MPWSP mitigation measures and compliance plan requirements during construction. Monitoring reports documenting construction and compliance activities are available here.

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