Public Works and Environmental Services

Fairfax County, Virginia

CONTACT INFORMATION: Our administrative offices are open Monday – Friday 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

Business and Industrial Wastewater Pretreatment

sampling water, analyzing, septage receiving site, sampling surface waterThe Department of Public Works and Environmental Services regulates industrial users of the sanitary sewer system in accordance with the Clean Water Act. Inspectors survey, inspect, and monitor wastewater from county businesses to prevent toxic or harmful substances from entering the sewer collection system and reaching the treatment plant.

Federal, state, and county regulations require some industrial users to pretreat their wastewater before it enters the sewer.  Pretreatment removes some pollutants from wastewater, and makes it compatible with the county’s sewer system and with wastewater treatment plants. Fairfax County may require installation and maintenance of pretreatment devices such as grease traps or interceptors, sediment traps, and oil-water separators. County businesses must maintain records of maintenance of their pretreatment systems for three years, and make these records available to county inspectors on request. Fairfax County Code Chapter 67.1 Article 3 establishes county pretreatment requirements. Fairfax County annually submits a summary report of program activities to the Virginia Department of Environmental Quality.

Benefits of proper pretreatment include:

  • Reduced pollution entering the sewer and treatment plants
  • Fewer sewer backups and overflows
  • Lower treatment and disposal costs
  • Improved health and safety
  • Compliance with federal, state and local environmental regulations
  • A cleaner environment.

Learn more about the National Pretreatment Program and Fairfax County

Fairfax Virtual Assistant