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

Project Status:: Under Construction
Webpage Updated:: Oct 07, 2026

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.

Prince William Water has teamed up with Ulliman Schutte Construction to transform the H.L. Mooney Advanced Water Reclamation Facility. What began as a simple project to cover our clarifier basins evolved into a full-scale design-build initiative—driven by our commitment to better serve the community. Want to see how this vision is coming to life? Watch our full video below to learn more about the exciting work shaping the future of water reclamation.

For more information about the project, watch The Vision Behind the H.L. Mooney Advanced Water Reclamation Facility Upgrades.

Project Information

Project Start Date	Construction Start Date	Estimated Completion Date
summer 2021	fall 2023	spring 2028

Project Start Date	summer 2021
Construction Start Date	fall 2023
Estimated Completion Date	spring 2028

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 and the Controls and Process Building Elevator are now complete.
6

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.
7

Work on the new Headworks structure is well underway, with most of the excavation complete, a large portion of the concrete wall and slab pours finished, and mechanical and electrical work currently in progress.
8

Odor control improvements will continue through 2027, including system testing, piping connections, scrubber upgrades, and headworks connections. Brief, localized odors may occur during tie-in work, with no impacts to water or sewer service expected. See the Community Update - Odor Control Improvements document below for the tie-in timeline and details on what nearby residents can expect.