Mold Removal Cost And Risk In Jefferson County, MT

A typical professional mold job in Jefferson County runs about $1,450 to $5,750 before rebuild, using the Helena, MT price level. Below are the 6 ZIP code neighborhoods, the age of the homes, FEMA's water hazard ratings and Montana rules.

1989Median year homes were built

43%Homes built before 1980

17%Homes rented, not owned

$408,000Median home value

5,388Housing units

12,501People

Housing figures from Census ACS 2019 to 2023.

Half the homes in Jefferson County were built before 1989, and 43 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 17 percent of homes in Jefferson County are rented, so most households here carry an owner's policy on the building itself.

Housing age swings by neighborhood. ZIP 59632 has the oldest homes here, a median year of 1977, and ZIP 59634 the newest, 1994.

Typical Prices In Jefferson County

JobSizeNational RangeJefferson County Estimate
Mold Remediationa typical professional job$1,500 to $6,000$1,450 to $5,750
Mold Remediationan attic$2,000 to $7,500$1,900 to $7,200
Mold Inspection and Testinga visual inspection$200 to $600$200 to $550
Mold Inspection and Testingan inspection with samples$300 to $1,000$300 to $950
Mold Inspection and Testinga clearance test$300 to $800$300 to $750

Estimate is the national range times 95.7 divided by 100, the price level for Helena, MT, 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 $5,750, that cap falls short by about $750 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 Jefferson County.

HazardFEMA Risk Rating
Inland floodingVery Low
Coastal floodingNot Applicable
HurricaneNot Applicable
Cold waveRelatively Low
Winter weatherRelatively Moderate

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

ZIP Code Neighborhoods In Jefferson County

ZIPAreaMedian Year BuiltBuilt Before 1980Median Home Value
59631Jefferson County197852%$229,300
59632Jefferson County197758%$260,600
59634Jefferson County199428%$500,700
59638Jefferson County199339%$269,000
59721Jefferson County199037%$615,700
59759Jefferson County197951%$333,000

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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Jefferson County Area

Helena, MT