Mold Removal Cost And Risk In Napa County, CA

A typical professional mold job in Napa County runs about $1,700 to $6,750 before rebuild, using the Napa, CA price level. Below are the 9 ZIP code neighborhoods, the age of the homes, FEMA's water hazard ratings and California rules.

1976Median year homes were built

58%Homes built before 1980

36%Homes rented, not owned

$838,800Median home value

55,601Housing units

136,070People

Housing figures from Census ACS 2019 to 2023.

Half the homes in Napa County were built before 1976, and 58 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 36 percent of homes in Napa County are rented, so most households here carry an owner's policy on the building itself.

Housing age swings by neighborhood. ZIP 94576 has the oldest homes here, a median year of 1940, and ZIP 94503 the newest, 1996.

Typical Prices In Napa County

JobSizeNational RangeNapa County Estimate
Mold Remediationa typical professional job$1,500 to $6,000$1,700 to $6,750
Mold Remediationan attic$2,000 to $7,500$2,250 to $8,450
Mold Inspection and Testinga visual inspection$200 to $600$250 to $700
Mold Inspection and Testingan inspection with samples$300 to $1,000$350 to $1,150
Mold Inspection and Testinga clearance test$300 to $800$350 to $900

Estimate is the national range times 112.6 divided by 100, the price level for Napa, CA, 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 $6,750, that cap falls short by about $1,750 at the top of that range. Read the form

Water Hazards FEMA Rates Here

FEMA rates Napa County high for inland flooding. 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 floodingRelatively Moderate
HurricaneNot Applicable
Cold waveNo Rating
Winter weatherVery Low

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

ZIP Code Neighborhoods In Napa County

ZIPAreaMedian Year BuiltBuilt Before 1980Median Home Value
94503Napa County199628%$663,900
94508Napa County196677%$774,600
94558Napa County197660%$855,600
94559Napa County196765%$877,100
94567Napa County199238%$386,300
94573Rutherford1946100%Not published
94574Napa County197265%$1,876,500
94576Deer Park1940100%$1,058,600
94599Napa County198835%$757,300

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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Napa, CA