Commercial Percolation Test

Percolation Test for Commercial Septic Tanks

At LePew Industrial Inc., we are able to arrange a Percolation Test (Perc Test) of your commercial leach line, all done by a certified engineer. Whether you are having a new commercial septic system installed or having issues maintaining your tank’s seepage level, we may recommend a commercial Perc Test. This determines whether your leach lines are working properly. A commercial Perc Test will ensure you how quickly a high volume of water will be absorbed into the subsoil of a drilled hole. The results of a Percolation Test for a commercial site are required in order to properly design a solution or diagnose any issues.

Percolation Test for Commercial Septic Tanks

Will I Need A Percolation Test For A Commercial Site?

A Perc Test is highly recommended if you are in process of purchasing a commercial site or land in a rural area. On rural sites without municipal sewage systems, a failed Perc Test means that a building cannot be built due to city & county codes. It’s best to purchase a property that passes a Perc Test. In many parts of the country, prime commercial building sites have become prohibitively expensive, so rural areas that don’t pass a Perc Test are quite common.

Typically, soils with high sand and gravel amount drains the best while soils with a high clay content or solid rock are not as effective. Most soils fall in the middle with a mix of course sand and gravel particles, miniscule clay particles and small slit particles. A commercial soil evaluation or a Perc Test is done to determine a site’s suitability.

If your site fails a Perc Test, you still have other options. For commercial sites that have high water tables, it may be possible to “de-water” the leaching area by properly placing gravel-filled trenches, sub surfacing drain pipes to conduct water away from the drain field.

How Is A Percolation Test Done For A Commercial Septic System?

A typical Perc Test is done by three or more holes dug about 30 – 40 feet apart in the drain field area. Holes are usually 6 – 12 inches in diameter and about 2 feet deep. Our technician will place 2 inches of gravel or clean sand into the bottom of each hole. Since a commercial Perc Test is meant to simulate the action conditions in a normally-working septic system, the soil is then “pre-soaked” for many hours. We then fill each hole with water up to 6 inches from the gravel, and measure how much the water drops in 30 seconds. The time it takes for water to fall one inch is carefully documented and used to determine the percolation rate, usually expressed in minutes per inch of drop. Test results are typically good for couple of years.

Call us today for your Commercial Septic System Perc Test today!