Onsite Sewage Disposal Systems & Private Well Water Systems
For more information about alternative septic 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.
- Applications - Septic and water permit applications in PDF format
- Fairfax Sewage Disposal and Well Water Codes
Drinking Water - Health Department Statement
- Information about Onsite Sewage and Water Services from the Virginia Department of Health
Alternative/Non-Conventional Septic Systems
See Alternative/Non-Conventional Septic Systems for information about state and county regulations, homeowner requirements for maintenance and monitoring, and certified operator lists.
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.
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."