What Suffolk city, VA's soil rates for a septic system
Very limited
In Suffolk city, VA, 90.6% of the surveyed land carries a "Very limited" rating for a standard septic drain field. Practically, that rules out a simple gravity system for most of the county - 90.6% of it sits in USDA's most-constrained bucket. Suffolk city covers 399.17 square miles and counts 103,105 residents.
This is a county figure, not a parcel figure
Two lots a mile apart in Suffolk city can carry different soil, even though they share one countywide rating. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Suffolk city.
System cost, conventional vs. engineered
Given Suffolk city's rating, plan for the engineered-system range rather than the conventional one. The engineered-system range, $10,000-$40,000 (mound or aerobic treatment), is the more realistic number to plan around, against $3,000-$8,000 for a conventional system on the rare lot that passes.
How Suffolk city, VA compares
Nationally, Suffolk city, VA is the 1,205-most-constrained of 3,058 rated counties for septic soil. Within Virginia alone it ranks 14 of 110.
Further reading
How this rating is built, and its real limits · Conventional vs. engineered septic systems