Mold Removal Cost And Risk In Williamson County, TX

A typical professional mold job in Williamson County runs about $1,450 to $5,900 before rebuild, using the Austin-Round Rock-San Marcos, TX price level. Below are the 19 ZIP code neighborhoods, the age of the homes, FEMA's water hazard ratings and Texas rules.

2005Median year homes were built

10%Homes built before 1980

33%Homes rented, not owned

$414,600Median home value

251,600Housing units

643,889People

Housing figures from Census ACS 2019 to 2023. Remediation workers here earn a median $21.58 an hour, BLS May 2025 wage survey.

Half the homes in Williamson County were built before 2005, and 10 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 33 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 76574 has the oldest homes here, a median year of 1980, and ZIP 76537 the newest, 2015.

Typical Prices In Williamson County

JobSizeNational RangeWilliamson County Estimate
Mold Remediationa typical professional job$1,500 to $6,000$1,450 to $5,900
Mold Remediationan attic$2,000 to $7,500$1,950 to $7,350
Mold Inspection and Testinga visual inspection$200 to $600$200 to $600
Mold Inspection and Testingan inspection with samples$300 to $1,000$300 to $1,000
Mold Inspection and Testinga clearance test$300 to $800$300 to $800

Estimate is the national range times 98.1 divided by 100, the price level for Austin-Round Rock-San Marcos, TX, 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 $5,900, that cap falls short by about $900 at the top of that range. Read the form

Water Hazards FEMA Rates Here

FEMA rates Williamson 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 Moderate
Coastal floodingNot Applicable
HurricaneRelatively Low
Cold waveRelatively High
Winter weatherVery High

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

ZIP Code Neighborhoods In Williamson County

ZIPAreaMedian Year BuiltBuilt Before 1980Median Home Value
76527Williamson County199623%$370,400
76530Williamson County199238%$277,200
76537Williamson County20154%$272,200
76573Williamson CountyNot published100%Not published
76574Williamson County198050%$252,000
76578Williamson County199126%$315,800
78613Cedar Park20036%$461,900
78615Williamson County200128%$348,900
78626Williamson County200912%$358,500
78628Williamson County200712%$467,700
78633Williamson County20072%$443,500
78634Williamson County20084%$334,200
78642Williamson County20135%$486,800
78664Round Rock199713%$317,400
78665Round Rock20102%$438,700
78674Weir19985%$43,000
78681Round Rock199814%$460,000
78717Austin20072%$599,200
78729Austin199310%$434,500

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.

Cities And Towns

Texas Rules On Mold

Who May Do Mold Work

Texas licenses mold assessment consultants, assessment technicians, remediation contractors, remediation workers and the companies they work for through the Texas Department of Licensing and Regulation. A license is needed when the mold covers 25 contiguous square feet or more.

State law says a license holder may not do both the mold assessment and the mold remediation on the same project. A person also may not own a share of both the assessment company and the remediation company on the same project. You can check any license with the TDLR license search.

Texas Department of Licensing and Regulation

Texas Mold And Insurance Rules

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Guides

Area Map

Williamson County Area

Austin-Round Rock-San Marcos, TX