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What is a soil's percolation rate?

A soil's percolation rate (measured in minutes per inch) indicates how quickly water can travel through the soil.
Updated: 11/28/2017
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This measurement is used to determine if a give site is suitable for a septic system. If the soil's percolation rate is too fast, the wastewater cannot be treated properly, leading to possible groundwater contamination. If the soil's percolation is too slow, it is often not possible to build an effective drain field for the septic system. You can proceed with the installation of your septic system if your soil has a suitable percolation rate.

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Answer: Percolation rates are a measure of how well the ground can accept the sewage effluent from your septic tank. A rate of 60 minutes per inch means that during the test, the water took 60 minutes to drop one-inch. Whereas a 30 mpi rate means that it only took 30 minutes to drop that same inch. Typical ranges are 5 mpi to 90 mpi. Anything slower than that will require Engineering help for the septic system.
Pro17 Engineering, LLC
Answer: that is the rate that the soil will take water, usually expressed in minutes per inch
Perry Environmental Consulting
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