Public Works and Environmental Services

Fairfax County, Virginia

CONTACT INFORMATION: Our administrative offices are open Mon – Fri by phone, email, and virtual 8 a.m. - 4:30 p.m. Front-desk hours 9 a.m. – noon.

TTY 711

12000 Government Center Parkway
Suite 358, Fairfax, Va 22035

Shahram Mohsenin,
Director, Wastewater Planning & Monitoring

About Wastewater Management

Fairfax County’s Wastewater Plant Celebrates 50 Years of Service to the Community

Fairfax County’s wastewater treatment plant protects human and environmental health, water quality and aquatic life.

By the Numbers

Data for FY2022

Planning & Monitoring

Financial and engineering planning are conducted to ensure funding and infrastructure are available to meet current and future wastewater needs. Analyses are conducted by the Wastewater Management’s (WWM) Environmental Laboratory to ensure regulatory compliance with state and federal laws and to provide quality control in the treatment process. In addition to laboratory testing, ecosystem monitoring in and around the receiving waters is conducted. WWM also administers the National Pretreatment Program which regulates industrial users of the sanitary sewer system in accordance with the Clean Water Act to protect health, safety and the environment.


The county’s wastewater collection and conveyance system includes sanitary sewer lines, pumping stations, and flow metering stations. The county monitors these components to provide continuous sewer service to its customers and a 24-hour trouble response service for unforeseen sewer backups.


All wastewater is treated using state-of-the-art physical, biological and chemical processes to remove pollutants and pathogens that are harmful to the environment. Wastewater from county homes and businesses is treated at one of several treatment facilities throughout the region. The county owns and operates the Noman M. Cole, Jr., Pollution Control Plant, located in Lorton, which treats approximately 40 million gallons per day of wastewater from homes and businesses

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