Septic soil in Dinwiddie County, VA, by the numbers
Very limited
Soil across 49.4% of Dinwiddie County, VA rates "Very limited" in USDA's septic-absorption-field interpretation. That reading means a conventional system is a poor bet here - 49.4% of Dinwiddie County lands in the strictest "very limited" bucket USDA uses. Dinwiddie County, VA is 503.826 square miles with a population of 28,576.
What Dinwiddie County's reading doesn't cover
Dinwiddie County's rating is an average across the whole county, not a promise about any one lot inside it. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Dinwiddie County will actually do.
What a system would cost here
With 49.4% of Dinwiddie County rating "Very limited", a standard gravity system is not a safe assumption here. 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.
Dinwiddie County's rank among Virginia counties
Nationally, Dinwiddie County, VA is the 2,890-most-constrained of 3,058 rated counties for septic soil. Within Virginia alone it ranks 97 of 110.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems