Mold Removal Cost And Risk In Williamson County, IL

A typical professional mold job in Williamson County runs about $1,300 to $5,250 before rebuild, using the Illinois nonmetro price level. Below are the 12 ZIP code neighborhoods, the age of the homes, FEMA's water hazard ratings and Illinois rules.

1981Median year homes were built

49%Homes built before 1980

29%Homes rented, not owned

$145,600Median home value

31,957Housing units

66,902People

Housing figures from Census ACS 2019 to 2023.

Half the homes in Williamson County were built before 1981, and 49 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 29 percent of homes in Williamson County are rented, so most households here carry an owner's policy on the building itself.

Housing age swings by neighborhood. ZIP 62841 has the oldest homes here, a median year of 1945, and ZIP 62918 the newest, 1989.

Typical Prices In Williamson County

JobSizeNational RangeWilliamson 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 87.4 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 Williamson County high for 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
HurricaneVery Low
Cold waveRelatively Moderate
Winter weatherRelatively High

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

ZIP Code Neighborhoods In Williamson County

ZIPAreaMedian Year BuiltBuilt Before 1980Median Home Value
62841Freeman Spur194576%$63,600
62902Williamson County197952%$184,300
62915Cambria198642%$77,500
62918Williamson County198939%$183,200
62921Williamson County194765%$75,000
62922Williamson County197953%$149,400
62933Energy197755%$138,500
62948Williamson County197359%$112,400
62949Hurst196767%$74,300
62951Williamson County197060%$89,600
62959Williamson County198346%$166,200
62974Williamson County198443%$161,600

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.

Illinois Rules On Mold

Illinois Mold And Insurance Rules

All Illinois Mold And Insurance Rules lines

Illinois Department of Insurance

All Illinois Department of Insurance lines

All Illinois counties

Guides

Area Map

Williamson County Area

Marion-Herrin, IL