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Major Improvements Coming to Arlington's Wastewater Treatment PlantArlington County this month launches Arlington Re-Gen, a major modernization of its Water Pollution Control Plant on South Glebe Road. This will be the initial phase of a multi-year upgrade effort to make the facility cleaner, greener, and ready for the future. Activities in the “Early Work Package” will focus on grading, building demolitions, relocation of utilities and foundation work for future treatment systems. This work will take place entirely within the Plant’s fenced boundaries, and wastewater treatment operations will continue without interruption. Next, the County will begin construction as part of the “Main Work Package,” anticipated to start in late 2026 and extend through spring 2031. Crews will build the new solids-handling facilities that form the core of the Re-Gen program, including thermal hydrolysis and anaerobic digestion systems to produce renewable resources using modern dewatering and screening equipment, improved truck loading and advanced odor control. The Arlington project has been in the works for several years and is unrelated to the recent DC Water sewage spill in the Potomac River. The process of cleaning wastewater from every Arlington toilet flush generates biosolids, a nutrient-rich material that can also be treated and reused. When completed, Re-Gen will enable the County to transform this material into Class A biosolids and renewable natural gas, reducing the Plant’s overall carbon footprint. Commissioning and phased startup of the new facilities will occur in 2031. Learn how Class A biosolids and renewable natural gas will be produced and used.Arlington County’s Water Pollution Control Plant treated 21 million gallons of wastewater each day from residences and businesses in the 2025 fiscal year. Nearly 20% of the plant’s flow came from the neighboring localities of Alexandria, Fairfax County, and Falls Church. Clean water is returned into the environment at Four Mile Run, then the Potomac River, before finally reaching the Chesapeake Bay. About Arlington Re-GenArlington Re-Gen implements the recommendations of the 2018 Solids Master Plan, which identified options for the modernization of plant facilities—focusing on solids treatment—while creating opportunities for sustainability and resource recovery. Prior Solids Master Plan upgrades on the Plant’s liquid treatment facilities and equipment were completed in 2011. About the Early Work PackageThe County Board approved funding for the Early Work Package in January 2024. The Early Work Package includes improvements totaling $32.2 million with the estimated total project cost of $198.4 million. This is funded through allocations designated for utility projects (Utility PAYG Construction Fund and Utility Plant Bond Fund) in the adopted FY 2023–2032 Capital Improvement Plan. Learn more about Arlington’s wastewater treatment processes.
MEDIA CONTACTKiara Candelaria Nieves
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