Septic suitability in Washington County, RI

Very limited

Washington County, RI's SSURGO dominant class comes back "Very limited", covering 71.7% of the county. That reading means a conventional system is a poor bet here - 71.7% of Washington County lands in the strictest "very limited" bucket USDA uses. For scale: 329.279 square miles and 130,333 people call Washington County home.

Before you rely on this for one lot

This is a countywide, area-weighted figure across every soil survey map unit in Washington County, RI - never a reading for one specific parcel. The real answer for one lot is still a site-specific perc test, running about $750-$1,850 (typically near $1,300).

Budgeting for a system in Washington County, RI

Washington County's soil reading pushes the likely outcome toward an engineered system rather than a conventional one. 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, Washington County, RI ranks 2,412 most-constrained nationally, and 3 of 5 within Rhode Island.

Before you act on this

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