Grand Isle County, VT: no USDA soil-survey match

Unrated

The dominant soil here (often already-developed urban land) carries no septic-suitability interpretation from USDA - too rare a gap to guess at. A local percolation test is the only way to know. Grand Isle County, VT covers 81.771 square miles and is home to 7,528 people, but the dominant soil here carries no SSURGO absorption-field interpretation to report.

This is a county figure, not a parcel figure

USDA's survey covers the whole of Grand Isle County, VT at once, not any single address. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Grand Isle County.

System cost, conventional vs. engineered

Without a countywide reading for Grand Isle County, both cost ranges below are worth knowing before a test, not just one. Nationally, conventional systems run $3,000-$8,000 and engineered alternatives run $10,000-$40,000 - which one applies to a lot in Grand Isle County is exactly what a perc test settles.

Further reading

How this rating is built, and its real limits · What to check before buying rural land on septic