Massachusetts Soil Evaluator Practice Test 2026 - Free Soil Evaluator Practice Questions and Study Guide

Percolation testing shows how quickly soil can absorb wastewater, which guides the size and suitability of a drain field. Because soil properties vary across a site, you need more than one test to capture that variation and to ensure there’s a workable backup if the primary area cannot be used later. Conduct the first test in the primary absorption area where the drain field is planned, and a second test in the proposed reserve area to verify there is an alternative suitable location on the property. This approach ensures both the main system and a potential backup meet the required percolation standards. Testing only in the same, secondary, or a random location wouldn’t reliably demonstrate availability of an adequate backup site.