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Loudoun VA Perc Test: The First Step to Buying Land for a Home

Perc Testing

When you are considering buying land for the purposes of building a home in Loudon VA, a perc test is one of the first steps you’ll want to take before buying the land. A perc test determines whether you can build a septic system on the property. If the conditions are not suitable for a septic system, then you may not be permitted to build.

A perc test should be conducted by a licensed, reputable septic system installation expert working closely with the local board of health to ensure that any special stipulations to the testing process are well understood in advance of the procedure. The local board of health may also follow up conditions for building based on the results of the tests conducted. A septic system expert should well understand these specifications.

Perc testing measures the amount of time it takes for liquid to drain through soil. Specifically, the aim is to see whether the site chosen for a septic system can support a drain field (or leach field), which receives the liquid discharge from the septic system and aids in eliminating bacteria as the water drains to lower levels of the ground.

In the simplest terms, the perc test involves digging a number of holes in the area of the proposed drain field. The location and depth is to be determined in consultation with the local health department in Fairfax VA. The perc test holes must be presoaked for a 24 hour period before testing. There should be no more than 6 inches of water standing the next day. Once this step is completed, the next step is to fill the holes to a fixed point at timed intervals (30 to 60 minutes typically) and to measure the rate the water surface drops at each interval. The percolation test, while simple, also has to be precise.

The perc testing professional will record this data and share it with local health department in Fairfax VA. Perc test results will determine the suitability for building a septic system and ultimately a home on the property in question. SES technicians are experts in septic systems, soil management and other environmental sciences related to home and commercial building. Contact us to make sure conditions are right to support your needs.

SES Company


  • Virginia Onsite Wastewater Recycling Association
  • National Onsite Wastewater Recycling Association
  • Water Environment Federation
  • Virginia Association of Counties
  • Northern Virginia Building Industry Association
  • Design Build Institute of America
  • Better Business Bureau
  • Dulles Area Realtors Association
  • Prince William Regional Chamber of Commerce

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Responsible Management Entity

SES is one of only three businesses to be licensed as a Responsible Management Entity. Loudoun County Virginia was the first in the Nation to establish requirements for an RME based on EPA recommendations. SES manages several communities required to have an RME.

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  • Licensed Conventional & Alternative Onsite Soil Evaluators (AOSE)
  • Licensed Conventional and Alternative Onsite Sewage System Operators
  • Licensed Conventional and Alternative Onsite Sewage System Installers
  • NSF Certified Septic System Inspectors
  • Virginia Class A Contractors License
  • Environmental, Monitoring Well and SDS Endorsements
  • Licensed Sewage Handler
  • Licensed Wastewater Treatment Plant Operators
  • Licensed Water System Operators

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