H.L. Mooney Advanced Water Reclamation Facility-Wide Improvements

Project Status:
Under Construction
Webpage Updated:
May 02, 2025

Project Description

Prince William Water’s award-winning H.L. Mooney Advanced Water Reclamation Facility (AWRF) in Woodbridge treats up to 24 million gallons of wastewater daily, meeting or exceeding federal and state standards. After treatment at Mooney AWRF, the reclaimed wastewater is released into Neabsco Creek, a tributary of the Potomac River. 

This infrastructure project is designed to improve operational resiliency and service levels, provide additional odor control, and allow the plant to continue meeting regulatory requirements. Project elements include enhancements to several areas of the Mooney facility: primary clarifier odor control upgrade; primary clarifier collection system improvements; primary clarifier electrical improvements; equalization basin modifications; Return Activated Sludge Building pump modifications; additional Ultraviolet equipment; yard valves replacement; supplemental carbon system improvements; alkalinity system upgrades; ferric system improvements; secondary clarifier improvements; plant structural protection and refurbishment.

Project Information

Project Start Date summer 2021
Construction Start Date fall 2023
Estimated Completion Date fall 2027

Current Project Activities

  • 1

    The H.L. Mooney Advanced Water Reclamation Facility Wide Improvements Project groundbreaking ceremony was held on December 6, 2023.

  • 2

    The Public Information Meeting and Project Tour occurred on May 6th. Presentation slides used during the meeting are now available in the project document section below for your reference.

  • 3

    Component 12: Ongoing repairs for Plant Structural Protection (miscellaneous assets).

  • 4

    Component 18: Fluidized Bed Incinerator Rehabilitation is complete, and the system is back online.

  • 5

    Component 19: All improvements on the Solids Building Elevator are now complete, with ongoing work on the Controls and Process Building.

  • 6

    Excavation and earth removal for the new Headworks building will begin on September 16, 2024, and will take place Monday-Friday from 6 a.m.-4 p.m. Truck traffic is expected to increase to 10-15 trucks per day, cycling throughout the day for 30-40 loads.  Most traffic impacts will be on-site, and dust and dirt control will be closely monitored. Street cleaning equipment will be on standby to ensure public roadways remain clear. 

  • 7

    Ongoing mechanical work including piping and valve replacements, as well as improvements to mechanisms and equipment in the Equalization Basins, Clarifiers, and Odor Control systems is currently underway.

  • 8

    The new Headworks facility excavation work is nearing completion, with concrete pours for sump pits and duct banks installation underway.

Additional Information

The information shown reflects the current progress of the project.

In the News

Groundbreaking Ceremony (December 6, 2023)

Envision

Mooney Facility Wide Improvement Project is registered to meet the sustainability criteria in the Envision framework.