District of Columbia, DC: no USDA soil-survey match

Unrated

Unlike most of the 3,144 counties on this site, District of Columbia, DC has nothing to show: 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.

What this number does and doesn't tell you

This is a countywide, area-weighted figure across every soil survey map unit in District of Columbia, DC - 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.

District of Columbia: conventional vs. engineered cost

With no SSURGO rating to go on, District of Columbia has no county-level steer either way on system cost. Conventional systems typically run $3,000-$8,000; where the soil doesn't allow one, engineered alternatives run $10,000-$40,000. A perc test decides which range applies.

Related guides

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