Mold Removal Cost And Risk In St. Charles County, MO

A typical professional mold job in St. Charles County runs about $1,450 to $5,700 before rebuild, using the St. Louis, MO-IL price level. Below are the 14 ZIP code neighborhoods, the age of the homes, FEMA's water hazard ratings and Missouri rules.

1994Median year homes were built

25%Homes built before 1980

19%Homes rented, not owned

$296,800Median home value

164,594Housing units

409,830People

Housing figures from Census ACS 2019 to 2023. Remediation workers here earn a median $32.22 an hour, BLS May 2025 wage survey.

Half the homes in St. Charles County were built before 1994, and 25 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 19 percent of homes in St. Charles County are rented, so most households here carry an owner's policy on the building itself.

Housing age swings by neighborhood. ZIP 63386 has the oldest homes here, a median year of 1964, and ZIP 63385 the newest, 2006.

Typical Prices In St. Charles County

JobSizeNational RangeSt. Charles County Estimate
Mold Remediationa typical professional job$1,500 to $6,000$1,450 to $5,700
Mold Remediationan attic$2,000 to $7,500$1,900 to $7,150
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 95.1 divided by 100, the price level for St. Louis, MO-IL, 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 $5,700, that cap falls short by about $700 at the top of that range. Read the form

Water Hazards FEMA Rates Here

FEMA rates St. Charles County high for inland flooding, 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 High
Coastal floodingNot Applicable
HurricaneVery Low
Cold waveRelatively High
Winter weatherRelatively High

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

ZIP Code Neighborhoods In St. Charles County

ZIPAreaMedian Year BuiltBuilt Before 1980Median Home Value
63301St. Charles County197755%$249,400
63303St. Charles County198928%$301,700
63304St. Charles County199117%$331,300
63332St. Charles County199139%$385,600
63341St. Charles County199423%$552,600
63348St. Charles County200316%$364,900
63365New Melle198834%Not published
63366St. Charles County199819%$283,900
63367Lake St. Louis200415%$381,000
63368O'Fallon20005%$327,700
63373St. Charles County196678%$206,500
63376St. Peters198730%$255,500
63385St. Charles County200613%$321,300
63386West Alton196485%$156,300

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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St. Louis, MO-IL