You must hire a Massachusetts Registered Professional Engineer (PE) or a Registered Sanitarian . They will design the system and oversee the test. You cannot dig or test on your own.
Andover’s geography presents unique challenges. The town lies within the Merrimack Valley and features a mix of glacial till, sandy outwash, and dense clay. Specific areas (near the Shawsheen River, Haggetts Pond, or Fish Brook) often have high water tables or slow-percolating clay soils. A perc test in Andover will typically reveal one of three soil types: percolation test in andover