H.L. Mooney Advanced Water Reclamation Facility-Wide Improvements
- Project Status:
- Under Construction
- Webpage Updated:
- Sep 05, 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
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1
The H.L. Mooney Advanced Water Reclamation Facility Wide Improvements Project groundbreaking ceremony was held on December 6, 2023.
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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.
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3
Component 12: Ongoing repairs for Plant Structural Protection (miscellaneous assets).
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4
Component 18: Fluidized Bed Incinerator Rehabilitation is complete, and the system is back online.
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5
Component 19: All improvements on the Solids Building Elevator are now complete, with ongoing work on the Controls and Process Building.
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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.
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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 additional pours currently in progress.
Additional Information
The information shown reflects the current progress of the project.
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Project Summary- 8-2025.pdf
Project Summary- 8-2025.pdf -
Frequently Asked Questions 082925.pdf
Frequently Asked Questions 082925.pdf -
CIP data Sheet082925.pdf
CIP data Sheet082925.pdf -
Public Meeting Presentation
Public Meeting Presentation -
Architecture
Architecture
In the News
- Service Authority Breaks Ground on $184M Construction Project at Mooney Wastewater Facility (Prince William Living)
- Heads Together: Engineers and Operators Plan a Huge Upgrade (Treatment Plant Operator)
- Connolly tours Woodbridge wastewater plant, promotes $2.1 trillion spending bill
- Service Authority Wastewater Facility Earns 13th Consecutive National Regulatory Compliance Award (Prince William Living)
- Prince William County Service Authority $200 Million Mooney Water Reclamation Facility upgrade underway (Potomac Local News)
Groundbreaking Ceremony (December 6, 2023)
Mooney Facility Wide Improvement Project is registered to meet the sustainability criteria in the Envision framework.