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Manassas city, Virginia

A shallow water table limits basements on 26% of Manassas city's mapped land. Shrink-swell clay limits houses without basements on 0%.

None of the county is in drought on the October 13, 2026 Drought Monitor map. FEMA's flood data list 6 flood losses here since 2016. 35% of homes were built before 1980, against 50% nationally; the median home dates from 1985.

Data as of October 13, 2026 · sources

0%

expansive clay: shrink-swell limits slab homes

26%

high water table: limits basements

0%

in drought, October 13, 2026

35%

of homes built before 1980

Soil under Manassas city

Expansive clay (limits slab homes)0.0%
High water table (limits basements)25.6%
Septic fields very limited62.5%
Clay swell (LEP, by area)2.3%
High-swell land (LEP 6%+)2.2%
Urban land, not rated17.3%
Mapped soil6,325 acres
Soil seriesShare hereSeries nationally: high water table
Arcola26%n/a
Manassas11%n/a
Panorama6%n/a
Albano6%n/a
Nestoria4%n/a
Brentsville4%n/a
Manassas Park city: 16%Prince William County: 35%Fairfax city: 10%Fairfax County: 33%Fauquier County: 28%Falls Church city: 13%Alexandria city: 44%Stafford County: 30%Manassas city Manassas Park cityPrince WilliamFairfax cityFairfaxFauquierFalls Church cityAlexandria cityStaffordManassas city
Manassas city (heavy outline) and nearby counties, shaded by high water table share.under 10%10-25%25-40%40-60%60%+

How we count

What the numbers mean here

On 26% of Manassas city's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.

Rain over the 12 months to August 2026: 33.26 in, 8.63 in below the 1991-2020 average year of 41.89 in.

USDA rates 62% of the land very limited for septic absorption fields.

Drought

0% of the county is in drought (D1 or worse) on the October 13, 2026 map. Part of the county was in drought in 42 of the last 52 weeks; the most was 100% of its area, in 42 weeks, most recently on the August 4, 2026 map.

October 21, 2025Share of area in drought, weeklyOctober 13, 2026
Category, October 13, 2026Share of county
D0 abnormally dry or worse0%
D1 moderate drought or worse0%
D2 severe or worse0%
D3 extreme or worse0%
D4 exceptional0%

Flood losses since 2016

6 flood losses since 2016, $25,941 paid. The worst year was 2017, with 2.

YearFlood losses
20160
20172
20180
20190
20201
20210
20221
20231
20241
20250
2026 to date0

Rain

Average year, 1991-202041.89 in
12 months to August 202633.26 in (-8.63)
202531.11 in (-10.78)
Wettest year since 18952003: 61.38 in
Driest year since 18951930: 20.07 in
Days with 1 inch or more, normal at WASHINGTON DC DULLES AP (13 mi away)11.4

Homes

Housing units14,505
Median year built1985
Built before 198035%
Built 2000 or later17%
Owner-occupied72%
Median value, owner-occupied$449,900
Single-family detached45%

What repairs cost

Published ranges from cost guides, not quotes. More sources, and where they disagree.

WorkRangeSource
Basement waterproofing, US $3,000 to $10,000 Fixr, February 6, 2026
Sump pump installation, US $800 to $2,000 Fixr, January 31, 2025
Crawl space encapsulation, US $2,000 to $8,000 Fixr, August 29, 2025

Nearby counties

PlaceDistanceExpansive clayHigh water table
Manassas Park city, VA 3 mi 0% 16%
Prince William County, VA 3 mi 9% 35%
Fairfax city, VA 12 mi 2% 10%
Fairfax County, VA 13 mi 6% 33%
Fauquier County, VA 18 mi 6% 28%
Falls Church city, VA 19 mi 0% 13%
Alexandria city, VA 22 mi 3% 44%
Stafford County, VA 22 mi 2% 30%

Sources: USDA SSURGO (August 5, 2026) · US Drought Monitor (October 13, 2026) · FEMA NFIP v3 (September 9, 2026) · NOAA (August 2026) · Census ACS 2020-2024. Methods · Data status