What is a Percolation Test, aka “Perk Test”?

PerkTest photo copy

A percolation test, or “perk” test consists of digging one or more holes in the soil of the proposed septic drainfield to a specified depth, presoaking the holes, then running the test by filling the holes to a specific level and timing the drop of the water level as the water percolates into the surrounding soil.

North Carolina no longer uses “perk” tests to determine the suitability of a soil for septic systems. Instead soil suitability and design parameters such as drainfield size and type are determined by a soil profile description (ie. How deep is the soil? What is the soil texture?). A detailed soil investigation is far more reliable than a perk test. A detailed soil investigation relies on in-situ soil characteristics and morphology to determine the suitability of the site to be utilized for a septic system.

Land Resource Management is staffed with North Carolina Licensed Soil Scientists. We are experts in the rules and regulations that govern onsite wastewater and septic permitting.  We’re also well versed on all recent North Carolina Septic System approvals for Innovative and Experimental septic systems.

If you are considering a land purchase, please give us a call today.

Percolation Test

LRM performing a detailed soils evaluation (with test pits) for septic permitting on a property located in Madison County, North Carolina.
















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