Mold Removal Cost And Risk In Williams County, ND

A typical professional mold job in Williams County runs about $1,300 to $5,250 before rebuild, using the North Dakota nonmetro price level. Below are the 9 ZIP code neighborhoods, the age of the homes, FEMA's water hazard ratings and North Dakota rules.

1993Median year homes were built

39%Homes built before 1980

43%Homes rented, not owned

$267,800Median home value

20,291Housing units

39,368People

Housing figures from Census ACS 2019 to 2023.

Half the homes in Williams County were built before 1993, and 39 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 43 percent of homes in Williams County are rented, so most households here carry an owner's policy on the building itself.

Housing age swings by neighborhood. ZIP 58856 has the oldest homes here, a median year of 1946, and ZIP 58843 the newest, 2009.

Typical Prices In Williams County

JobSizeNational RangeWilliams County Estimate
Mold Remediationa typical professional job$1,500 to $6,000$1,300 to $5,250
Mold Remediationan attic$2,000 to $7,500$1,750 to $6,550
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 $700

Estimate is the national range times 87.3 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 $5,250, that cap falls short by about $250 at the top of that range. Read the form

Water Hazards FEMA Rates Here

FEMA rates Williams County high for cold wave, winter weather. Water from these events is where mold claims start, and flood water is a separate policy. FloodSmart says mold damage is not covered under standard NFIP flood policies. FloodSmart

HazardFEMA Risk Rating
Inland floodingRelatively Low
Coastal floodingNot Applicable
HurricaneNot Applicable
Cold waveRelatively High
Winter weatherVery High

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

ZIP Code Neighborhoods In Williams County

ZIPAreaMedian Year BuiltBuilt Before 1980Median Home Value
58755Williams County196860%Not published
58801Williams County199837%$279,800
58830Williams County194785%$181,300
58843Williams County200921%$296,400
58845Williams County195582%$181,900
58849Williams County198838%$239,100
58852Williams County197852%$207,200
58853Williams County198446%Not published
58856Williams County194680%$248,100

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.

North Dakota Rules On Mold

North Dakota Mold And Insurance Rules

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Area Map

Williams County Area

Williston, ND