Hampshire County, MA: the USDA septic-suitability picture
Very limited
USDA puts Hampshire County, MA at "Very limited" for septic absorption fields, the dominant reading across 91.9% of the county's soil. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 91.9% of Hampshire County's land. The county spans 527.236 square miles, home to 165,399 people.
What this number does and doesn't tell you
This is a countywide, area-weighted figure across every soil survey map unit in Hampshire County, MA - never a reading for one specific parcel. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.
Hampshire County: conventional vs. engineered cost
91.9% of Hampshire County carrying a "Very limited" reading changes the realistic budget here. Conventional systems run $3,000-$8,000 where they pass; where they don't, engineered alternatives (mound or aerobic treatment, whichever the health department requires) run $10,000-$40,000 - budget toward the higher figure until a perc test says otherwise.
Where this sits nationally
Among the 3,058 rated counties on this site, Hampshire County, MA ranks 1,053 most-constrained nationally, and 2 of 14 within Massachusetts.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems