Delta Water Treatment Plant Groundwater Recharge ProjectUpdate Council Water Committee
Item 25-1281
November 13, 2025
SITE PLAN
Summary
Groundwater Recharge Project
3 percolation ponds
2 Sources of Supply
San Joaquin River Delta
Mokelumne River
Stores surface water to be used later
To be extracted from groundwater wells located throughout the City
Earthwork nearly complete
Ponds, Islands, and Levees substantially complete
Finalizing the designs for the piping infrastructure, roads, fencing, and visitor center.
After the Earthwork is finished, project will be delayed until spring 2026. (rainy season) Progress to Date
Photos – September 24
Photos – September 25
Photos – September 29
Photos – October 2
Photo – October 3
Photo – October 6
Photo – October 13 - Drone
Photo – October 28
Project Photos
Photos
Photos – South Pond – November 4
September 2024
City Council Approved Contract
February 2025
Changes made to 30% Design
August 2025
Council Approved Contract Change Order #1
CEQA Addendum for the Delta Water Treatment Plant
Hire Construction Management Firm
September 2025
Construction Started
November 2025
Earthwork Complete (Construction of Ponds)
Winter 2025
Finish Design on Piping and Facilities
Spring 2026
Install Piping and Electrical
December 2026
Substantial Completion of Project
Project Timeline – Groundwater Recharge Project
QUESTIONS?