A percolation test, also known as perc test, is an important part of the soil analysis needed prior to determining what type of septic system to install. The percolation rate of the soil is an indicator of how quickly water seeps through the various layers.
For septic systems to function correctly, water entering the leach field needs to seep through the soil at a particular rate. If the perc rate is too slow, you run the chance of backing sewer up as the soil cannot accept the treated waste water fast enough. Likewise, if the waste water seeps too fast, it may not have enough time to be treated through the soil’s natural processes before reaching aquifers. Sandy soil, for example, will accept water at a much higher rate than soil rich in clay or soil with a high water table.
A perc test involves drilling multiple holes and observing the rate at which water poured in dissipates. Based on data from the percolation test, we can recommend either a conventional or non-conventional septic system.