Central Weber Wastewater Treatment Plant Upgrade

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This $135 million project includes engineering, design and construction management/general contractor services to design and construct a new 30-mgd activated-sludge treatment plant as an expansion to the existing facility, including all civil, structural, mechanical, electrical, instrumentation, commissioning and start up.


    Location: Ogden, Utah, United States
    Region: Americas
    Market Sector: Water & Wastewater
    Status: In Progress
    The Central Weber Sewer Improvement District provides wastewater treatment for residents of central and eastern portions of Weber County in Northern Utah. MWH has worked with the Central Weber Sewer Improvement District continually for the past 35 years. The plant serves a population of approximately 213,000 people. The existing treatment facility was a single-stage trickling filter plant that was built and put into service in 1959 with a rated capacity of 45 mgd. Based on the needs of the growing community and the new effluent rate and flow-level regulations, the District needed a new parallel activated sludge treatment plant to meet plant needs and provide adequate capacity.

    By increasing the facility’s capacity to 60 mgd, the District anticipates having adequate capacity to accommodate projected growth until 2025. MWH is also upgrading the facility to bring it into compliance with current EPA and State of Utah regulatory requirements. MWH is the designer and GC/CM on this project.

    This project involves expanding and rehabilitating the Central Weber Wastewater Treatment Plant’s sewage treatment infrastructure and associated appurtenances.

    MWH also made modifications to the existing chemical building and performed the associated site work, including yard piping, roadways, fencing, drainage facilities, grading, electrical distribution and process control facilities.

    MWH pre-qualified local subcontractors to construct the civil, structural, mechanical, electrical and architectural components of the work and competitively bid each work package. Additionally, MWH bid and directly purchased roughly $22M in process equipment and materials. Two soil bentonite cut-off walls were constructed to assist in dewatering. Approximately 250,000 cubic yards of material were excavated in preparation for the new plant facilities. Construction of the cast-in-place concrete structures and construction of masonry buildings, installation of mechanical equipment, process electrical and installation of yard piping are all complete.

    • Engineering and design
    • Value engineering and constructability reviews
    • Construction management-at-risk (CM-at-Risk)
    • Permit applications, submittals, review and issuance
    • Site safety
    • QA/QC
    • Commissioning and start up
    • New 30-mgd activated-sludge plant
    • A new headworks facility
    • A new raw sludge pump station
    • Two new primary clarifiers
    • New aeration basins and blower building
    • Four new secondary clarifiers with RAS/WAS pump station
    • A new chlorine contact basin and utility water pump station
    • A new dechlorination building
    • Two new anaerobic digester and digester control buildings
    • A new sludge thickening building


    Our address

    Ogden, Utah, United States
    41.278947, -112.042887

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