Crawl Space Map

Virginia / King and Queen County

Score 24 · moderate · #19 of 95 in VA

Crawl space moisture in King and Queen County, VA

King and Queen County scores moderate: no single wet-soil signal dominates its mapped acres. Where a seasonal water table is reported — 88% of acres — it averages 2.4 ft below grade.

Size venting or encapsulation

1234
  1. 1Water table 2.4 ft
  2. 2Wet soils 10%
  3. 3Moisture score 24
  4. 4EPA radon zone 3
Somewhat excessively2%Well72%Moderately well17%Somewhat poorly0%Poorly5%Very poorly4%
Share of mapped soil acres in King and Queen County, VA by NRCS drainage class (dominant condition), bars to scale; wetter classes highlighted. Covers 96% of mapped acres.
Dominant drainage
Well drained
72% of acres
Group D soils
12%
slow infiltration
Flood-prone acres
16%
any flooding frequency
Ponding
0.3%
acres where water ponds

Reading the King and Queen County soil survey

The score of 24 combines four parts, each from the USDA survey: wet drainage classes contribute 15.2 points of 100 on their own scale, group D soils 12, a shallow water table 55.6, and flooding 8.1; the weights are on the methodology page. The dominant hydrologic group is B (68% of acres): moderate infiltration.

6%A68%B14%C2%D7%B/D2%C/D
Hydrologic soil groups in King and Queen County by share of acres, columns to scale. Group D and dual groups (x/D) shed water slowly and hold it near the surface.

At 2.4 ft the seasonal water table is usually below a crawl-space floor, but the 88% of acres that report one are by definition the wettest parts of the county; on those lots, a wet spring can bring water close to the footings.

King and Queen County against the rest of Virginia

King and Queen County ranks 19 of 95 Virginia counties, 12 points above the state median of 12. That puts it in the wettest quarter of the state. Statewide, 11% of mapped soil is in the wet drainage classes; here it is 10%, below the state figure — the score here comes from a shallow water table rather than drainage class alone. After well drained, the next most common class is moderately well drained at 17%.

Flooding. 4.4% of acres with a flooding class are rated occasional; 7.9% of acres with a flooding class are rated rare. That is a large flood-prone share; a crawl space in the floodplain needs flood vents under most local floodplain ordinances, which is a separate rule from R408 and can rule out a fully sealed design.

What it means for a crawl space here

In a moderate county the soil record is mixed rather than uniformly wet, so conditions vary from lot to lot. Where the lot drains, the model-code default — a vented crawl space with 1 sq ft of net vent per 150 sq ft of floor, or 1 per 1500 with a Class I vapor retarder on the ground — is a reasonable starting point; where the sections above point to a shallow water table or flood-prone soil on your lot, plan as for an elevated county. Either way, check the site first: grading that falls away from the foundation, gutters and downspouts that discharge well clear of it, and a ground cover over bare earth. A wet crawl space in a moderate county points to one of those first.

Radon. EPA radon zone 3. The zone is a county-level prediction; EPA says elevated levels occur in every zone and every home should be tested.

Near King and Queen County by score

Culpeper County 24Prince William County 24Spotsylvania County 23Westmoreland County 23

All 95 Virginia counties

Sources: USDA NRCS SSURGO via Soil Data Access (muaggatt: drclassdcd, hydgrpdcd, flodfreqdcd, pondfreqprs, wtdepannmin), acreage-weighted (survey area VA097; drainage covers 96% of 208,700 mapped acres); EPA Map of Radon Zones, county table (June 2024 JSON); IRC R408.3 Unvented crawl space, as adopted in S.C. Code Regs. 8-1221 (LII). Checked 2026-10-23.