Onsite Sewage Disposal Systems & Private Well Water Systems

The Health Department's Onsite Sewage and Water Program administers state and local regulations for sewage disposal systems and private well water supplies to ensure proper construction, operation and maintenance in Fairfax County.

For more information about alternative onsite sewage systems, conventional septic systems and private well water, please call the Onsite Sewage Disposal Systems & Private Well Water Systems Program direct line at 703-246-2201.

Important Notice: In accordance with the Underground Utility Damage Prevention Act, all appointments that require Fairfax County Health Department personnel to probe, auger or otherwise "excavate" on the property will be scheduled no sooner than three working days from the date of request to allow for utility clearance.


Alternative Onsite Sewage Systems

Reminder: Septic System Inspection Due Annually

See Alternative Onsite Sewage Systems for information about state and county regulations, homeowner requirements for maintenance and monitoring, and certified operator lists.

Soil Evaluations

All new construction for commercial and residential properties without access to public sewer as well as existing malfunctioning sewage disposal systems require a site soil evaluation by a properly trained and licensed Environmental Health Specialist.

Shallow-Placed Systems

Soil evaluations for proposed shallow-type onsite sewage disposal systems can only be done during months when average rainfall meets or exceeds a certain amount. Fairfax County's Individual Sewage Disposal Facilities code sets the amount at "the long-term monthly composite average rainfall from Washington Dulles International Airport and Ronald Reagan Washington National Airport."

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Contact Us

Public Counters:
Mon. Fri.
8 a.m. 4 p.m.  

  • 10777 Main Street, Fairfax, VA 22030
  • Main Phone: 703-246-2444
  • Fax: 703-653-9448
  • Send an Email

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Contact Fairfax County: Phone, Email or Twitter | Main Address: 12000 Government Center Parkway, Fairfax, VA 22035
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