Soil Percolation Rate Calculator
Enter your perc test data — time and drop distance — to calculate your soil's MPI rate, determine leach field suitability, and get site-specific recommendations.
1. Enter Your Perc Test Data
Perform a standard percolation test by pre-soaking the hole for 24 hours, then recording how long it takes water to drop a set distance.
Standard perc tests measure 1" drop. Use whatever distance you recorded.