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Clifton VA Perc Testing

Perc Testing

A septic system will only work if the soil is permeable to water, as determined by a 'perc' test. If the perc test fails, you may need to use a more expensive alternative system – or - the land may be unbuildable.

Perc Test procedure. A typical perc test consists of three or more holes dug about 30 to 40 feet apart in the proposed septic drain field area. The holes are typically 6 to 12 inches in diameter and generally 2 feet deep. This is the typical depth of the trenches in a septic leach field. Two inches of clean sand or gravel are placed in the bottom of the hole. Since the perc test is meant to simulate the actual conditions in a working septic system, the soil is then “pre-soaked” for several hours.

Next, each hole is filled with water to a depth of 6 inches above the gravel and how much the water drops in 30 minutes is measured. The times are recorded and can used to calculate the percolation rate. That is the time it takes for the water to fall one inch. This is usually expressed in minutes per inch of drop.

A rate of 60 minutes per inch, meaning the water dropped one inch in 60 minutes, is often the cutoff point for a standard gravity-flow septic system, although the number varies from 30 to 120 minutes depending on the state regulations. Test results are usually good for two years.

Call SES today at 1-866-249-5630 and leave your Clifton Va Perc Testing worries to us.

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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