Drinking Water Supply Treatment Projects

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Overview

The Mitchell Advanced Treatment Emerging Contaminants Project and the Townsend Advanced Treatment Facility Project will address emerging contaminants, such as per- and polyfluoroalkyl substances (PFAs). These projects will install granular activated carbon (GAC) contactors to help the City meet future PFAs regulatory requirements.

The Water Resources Department anticipates the water treatment improvements will go online in time to meet the Environmental Protection Agency's (EPA) National Primary Drinking Water Regulation (NPDWR) enforceable levels, called maximum contaminant levels (MCLs) requirements.

Department staff thanks customers for their patience as they strive to provide continued exceptional water quality and customer service.

Mitchell Advanced Treatment Emerging Contaminants Project

The Mitchell Advanced Treatment Emerging Contaminants Project will complete needed plant improvements, such as installing a GAC contactor and other enhancements, to address residuals or solids that form in the treatment process.

The City team uses a construction-manager-at-risk project delivery method, which lets the designer and constructor work together on the facility's final design improvements.

Major Mitchell Water Treatment Plant Improvements

Pump Station and GAC Treatment
New Operations/Maintenance Facility and Rehabilitation of Plant Laboratory/Control Room
Site Security Improvements - Extension of Property Boundary Exterior Brick Fencing
Electrical Service Improvements
Site Stormwater Improvements
Site Access Improvements – Battleground Avenue
Dual Media Treatment System
Relocation of Chemical Facilities
Reconfiguration of Flocculation and Sedimentation Basins
Installation of new Backwash Treatment Basin for residuals (solids) removal
Modifications of Existing Equalization Basin
New Backwash Transfer Pump Station
Clearwell and Other Drain Improvements

Mitchell Water Treatment Plant Improvements Schedule

June 2023	Issued a Request for Qualifications for the Construction Manager at Risk (CMAR) Team for the Mitchell Water Treatment Plant Improvements
January 2024	Re-Issued Request for Qualifications for the CMAR Team
September 2024	Re-issue a Request for Qualifications for the CMAR Team
September 2024	Treatment Plant Rezoning Meeting (City's Petition Response, Petition, Presentation, Recording, Summary, Handout, Project Story map, Impacted Neighborhoods Letter, Feedback Survey, Rezoning Process, Land Development Ordinance)
November 2024	Treatment Plant Rezoning Follow up Meeting (Presentation, Summary, Impacted Neighborhoods Follow-up Letter)
February 2025	Council Approval of the first CMAR Contract
August 2025	Mitchell Water Treatment Plant Improvements Neighborhood Meeting (Presentation, Handout)
Spring 2026	Phase 1 Construction Begins
December 2026	Mitchell Water Treatment Plant Improvements Neighborhood Meeting (Presentation)
2026	Completion of the design of Advanced Treatment of Emerging Contaminants Project
Fall 2026	Phase 2 Construction Begins
2031	Mitchell Water Treatment Plant Upgrades Project Completion and PFAS Regulatory Compliance Deadline

* This schedule is likely to change based on regulatory requirements and deadlines.

Townsend Advanced Treatment Facility Project

The Townsend Advanced Treatment Facility Project will be delivered through a design-build, alternative-delivery method. This method allows the City, contractors, engineers, and subcontractors to work collaboratively to meet project timelines and budgets.

Townsend Advanced Treatment Facility Large-scale Improvements

GAC pump station
GAC contactors
Large diameter piping
Maintenance areas for the advanced treatment
Expansion of Townsend Water Treatment Plant footprint; additional clearing, grubbing, and grading will be included in the project

Project Schedule

October 8, 2025

Water Resources and Office of Business Opportunity host a build-design project meeting to discuss proposed renovations to the Townsend Water Treatment Plant. Engineers, contractors, subcontractors, and support service are encouraged to attend. To attend, please register online.

* This schedule is likely to change based on regulatory requirements and deadlines.