Mesa Signal Butte Water Treatment Plant

  • Client:

    City of Mesa

  • Delivery Method:


  • Year Completed:


  • Specialties:

    Water & Wastewater

Features & Highlights

  • Surface and ground water treatment
  • Sand ballasted flocculation used to reduce the plant footprint for future capacity onsite
  • Sundt provided plant operations services during the initial phase.
  • The team identified over $18M in value engineering leading to $9M in project savings.
Project Overview

Sundt constructed this 24 MGD water treatment plant with a planned ultimate capacity of 48 MGD. Portions of the plant were built for the final capacity during this initial construction phase including the finished water pump stations and other plant components. The project site currently contains an 8 MGD buried concrete potable water reservoir, a large pump station serving several City water pressure zones, and the supporting electrical and controls building.

The City of Mesa forecasted that seasonal demand needs were going to exceed the current total production capacity for potable water in the summer of 2018. By working with the City and the design team, the team developed an approach that focused efforts on water production related activities. By focusing on producing water early to meet the City’s demands, the team was able to start-up and commission the plant to deliver water six months ahead of the scheduled delivery date.

Because the project was located in a residential neighborhood, extensive public involvement was key to the project’s success. The team coordinated public open houses and outreach events to inform the community on the project’s goals, schedule, progress and upcoming activities throughout construction. At project completion, an open house was held for the public to view and educate them on the new facility.

Significant treatment plant processes included:

  • raw water ozone contactor and PAC addition,
  • sand ballasted flocculation facilities,
  • deep-bed biological filtration including backwash and air-scour facilities,
  • residuals facilities including recovered water basin and pumps,
  • solids and residuals facilities including mechanical dewatering,
  • chemical storage and feed systems including fluoridation,
  • ozone storage, generation and contact basins,
  • sodium hypochlorite generation
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The team delivered water prior to the peak summer demands six months ahead of the scheduled delivery date while still adhering to safety and quality standards.


Awards & Accolades

2019 Water Treatment Project of the Year, AZ Water Association

2019 Best Project, Water/Environment category, Engineering News Record Southwest

2018 Top Project Award, Water & Waste Digest