But every perc test I have done was to get a permit, which required an engineered septic system. I'm guessing that saturated soil is what will percolate the worst, so that's probably the best time to test to test under the most demanding conditions. Alternatives to a Perc Test. Percolation tests, or perc tests, measure percolation rates. Many greywater codes use a soil type chart to predict drainage rates instead of percolation rate data. After testing is completed, fill the hole with soil. How much perc testing should cost. Wikipedia says “a percolation test (colloquially called a perc test) is a test to determine the water absorption rate of soil (that is, its capacity for percolation) in preparation for the building of a septic drainage field (leach field) or infiltration basin. Many do-it-yourself tests, however, measure percolation rates in terms of inches per hour, which is perfectly adequate for garden care. Testing requirements vary greatly from state to state and often from town to town, as most states allow individual towns to establish separate rules within state guidelines. Average costs and comments from CostHelper's team of professional journalists and community of users. The results of a percolation test are required to properly design a septic system. I have seen some tests indicate one should fill the hole with water, let that drain, and then the next day (or immediately after the first drain) perform the percolation test by filling the hole with water and timing the drain rate. A home percolation test is a simple way to measure how quickly your soil drains and to determine how much area you need to infiltrate the greywater. They only mention digging a hole, filling it, then timing it drain. Soil laboratory professionals usually measure percolation rates in terms of minutes per inch, typically in the context of septic tank testing. The two main tests used to determine a site’s suitability for a septic system are a perc test and visual observation of the soil in a test pit, sometimes referred to as a deep hole test. If you buy land without doing a perc test, you can complete a perc test after you purchase it. An official perc test that meets all local requirements for a septic or drainage system permit can cost $100-$1,000 or more depending on site size and conditions. With a passing test, you will be able to install a septic system. Professional percolation tests, required for septic leach fields, are expensive, and unnecessary for a small greywater system. I have seen other tests, however, make no mention of this initial fill. drain, then the perc test has failed, and a project such as a conservation landscape should be considered instead.

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