Mold Removal Cost And Risk In Lewis and Clark County, MT

A typical professional mold job in Lewis and Clark County runs about $1,450 to $5,750 before rebuild, using the Helena, MT price level. Below are the 9 ZIP code neighborhoods, the age of the homes, FEMA's water hazard ratings and Montana rules.

1982Median year homes were built

48%Homes built before 1980

30%Homes rented, not owned

$358,200Median home value

33,837Housing units

72,580People

Housing figures from Census ACS 2019 to 2023.

Half the homes in Lewis and Clark County were built before 1982, and 48 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 30 percent of homes in Lewis and Clark County are rented, so most households here carry an owner's policy on the building itself.

Housing age swings by neighborhood. ZIP 59410 has the oldest homes here, a median year of 1964, and ZIP 59602 the newest, 1995.

Typical Prices In Lewis and Clark County

JobSizeNational RangeLewis and Clark 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 Lewis and Clark 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 Lewis and Clark County

ZIPAreaMedian Year BuiltBuilt Before 1980Median Home Value
59410Lewis and Clark County196466%$227,700
59601Lewis and Clark County197363%$355,000
59602Lewis and Clark County199528%$369,800
59633Lewis and Clark County198641%$409,500
59635Lewis and Clark County198543%$356,200
59636Helena West SideNot published100%Not published
59639Lewis and Clark County197953%$294,300
59640Lewis and Clark County198438%$275,000
59648Lewis and Clark County198743%$321,400

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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Lewis and Clark County Area

Helena, MT