Occoquan Creek Sewage Pumping Station (SPS) Replacement and Gravity Sewer Main Project

The Occoquan Creek Sewage Pumping Station (SPS) Replacement and Gravity Sewer Main Project will modernize critical wastewater infrastructure serving Prince William County. The existing pump station, built in 1975, has aging equipment and is increasingly vulnerable to flooding and shoreline erosion. A 2018 condition assessment confirmed the need for full replacement to ensure long-term reliability, environmental protection, and continued service to the community.

The project also includes construction of a new 42-inch gravity sewer main that will convey wastewater more efficiently to the new pump station. The gravity main will replace aging infrastructure, improve system hydraulics, and provide capacity for future growth.

Prince William Water evaluated multiple locations and selected a new pump station site that improves safety, efficiency, and resiliency while minimizing community impacts. The new facility will be elevated above the floodplain and relocated away from the shoreline, significantly reducing flood risk. Construction is targeted to begin in late 2026, with an estimated one- to two-year schedule.

Project Goals

• Replace the existing Occoquan Creek SPS with a modern facility that meets current design and regulatory standards.
• Construct a new 42-inch gravity sewer main to improve conveyance reliability and system performance.
• Increase future wastewater capacity to approximately 17.28 million gallons per day (MGD).
• Improve system resiliency by reducing flood risk and exposure to shoreline erosion.
• Minimize odor and noise impacts through advanced odor control and sound-reducing enclosures.

Key Benefits

• A more resilient, discreet, and reliable wastewater facility.
• Improved wastewater conveyance through a new large-diameter gravity sewer main.
• Activated carbon odor control achieving up to 99.5% hydrogen sulfide removal.
• Reduced odor formation due to improved pump efficiency and lower wastewater retention times.
• Reliable wastewater service to support current demands and future growth in Prince William County.