Mold Removal Cost And Risk In Washington County, MO

A typical professional mold job in Washington County runs about $1,250 to $5,050 before rebuild, using the Missouri nonmetro price level. Below are the 10 ZIP code neighborhoods, the age of the homes, FEMA's water hazard ratings and Missouri rules.

1984Median year homes were built

44%Homes built before 1980

24%Homes rented, not owned

$118,400Median home value

10,736Housing units

23,483People

Housing figures from Census ACS 2019 to 2023.

Half the homes in Washington County were built before 1984, and 44 percent went up before 1980. Older plumbing, roofs and window seals are where slow leaks start, and slow leaks are the mold most home policies leave out. About 24 percent of homes in Washington County are rented, so most households here carry an owner's policy on the building itself.

Housing age swings by neighborhood. ZIP 63631 has the oldest homes here, a median year of 1974, and ZIP 63626 the newest, 1994.

Typical Prices In Washington County

JobSizeNational RangeWashington County Estimate
Mold Remediationa typical professional job$1,500 to $6,000$1,250 to $5,050
Mold Remediationan attic$2,000 to $7,500$1,700 to $6,300
Mold Inspection and Testinga visual inspection$200 to $600$150 to $500
Mold Inspection and Testingan inspection with samples$300 to $1,000$250 to $850
Mold Inspection and Testinga clearance test$300 to $800$250 to $650

Estimate is the national range times 83.9 divided by 100, the price level for the nonmetro part of the state, rounded to $50. National ranges from Remediational cost guide, price level from BEA Regional Price Parities 2024.

The standard limited fungi endorsement caps mold at $5,000. Against a typical job here of up to $5,050, that cap falls short by about $50 at the top of that range. Read the form

Water Hazards FEMA Rates Here

FEMA rates none of the water hazards below as high for Washington County.

HazardFEMA Risk Rating
Inland floodingRelatively Low
Coastal floodingNot Applicable
HurricaneVery Low
Cold waveRelatively Moderate
Winter weatherRelatively Low

Source FEMA National Risk Index, December 2025, county level.

ZIP Code Neighborhoods In Washington County

ZIPAreaMedian Year BuiltBuilt Before 1980Median Home Value
63030Washington County199142%$191,900
63071Washington County198248%$122,900
63622Washington County198534%$105,000
63626Washington County199431%$118,200
63630Washington County199228%$111,600
63631Washington County197463%$138,100
63648Washington County198436%$93,600
63660Washington County198050%$101,300
63664Washington County197852%$122,800
63674Washington CountyNot published38%Not published

ZIP areas are Census ZIP Code Tabulation Areas, placed in the county that holds most of their land, per the Census 2020 ZIP relationship files.

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