Hampden County, MA: the USDA septic-suitability picture

Very limited

Hampden County, MA: USDA's soil survey calls 86.9% of the county "Very limited" for a septic leach field. That reading means a conventional system is a poor bet here - 86.9% of Hampden County lands in the strictest "very limited" bucket USDA uses. The county spans 617.006 square miles, home to 464,151 people.

What this number does and doesn't tell you

Two lots a mile apart in Hampden County can carry different soil, even though they share one countywide rating. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.

Hampden County: conventional vs. engineered cost

86.9% of Hampden 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, Hampden County, MA ranks 1,547 most-constrained nationally, and 4 of 14 within Massachusetts.

Further reading

How this rating is built, and its real limits · Conventional vs. engineered septic systems