Mold Removal Cost And Risk In Sonoma County, CA

A typical professional mold job in Sonoma County runs about $1,600 to $6,450 before rebuild, using the Santa Rosa-Petaluma, CA price level. Below are the 37 ZIP code neighborhoods, the age of the homes, FEMA's water hazard ratings and California rules.

1979Median year homes were built

52%Homes built before 1980

38%Homes rented, not owned

$779,000Median home value

206,319Housing units

485,642People

Housing figures from Census ACS 2019 to 2023.

Half the homes in Sonoma County were built before 1979, and 52 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 38 percent of homes in Sonoma County are rented, so most households here carry an owner's policy on the building itself.

Housing age swings by neighborhood. ZIP 95419 has the oldest homes here, a median year of 1938, and ZIP 95492 the newest, 1992.

Typical Prices In Sonoma County

JobSizeNational RangeSonoma County Estimate
Mold Remediationa typical professional job$1,500 to $6,000$1,600 to $6,450
Mold Remediationan attic$2,000 to $7,500$2,150 to $8,100
Mold Inspection and Testinga visual inspection$200 to $600$200 to $650
Mold Inspection and Testingan inspection with samples$300 to $1,000$300 to $1,100
Mold Inspection and Testinga clearance test$300 to $800$300 to $850

Estimate is the national range times 107.8 divided by 100, the price level for Santa Rosa-Petaluma, 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 $6,450, that cap falls short by about $1,450 at the top of that range. Read the form

Water Hazards FEMA Rates Here

FEMA rates Sonoma 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 Sonoma County

ZIPAreaMedian Year BuiltBuilt Before 1980Median Home Value
94515Sonoma County197563%$830,700
94922Sonoma County196758%Not published
94923Sonoma County198439%$1,177,900
94928Rohnert Park198245%$634,700
94931Sonoma County198342%$788,200
94951Sonoma County197362%$1,213,100
94954Sonoma County198541%$790,100
94972Sonoma CountyNot published0%Not published
95401Sonoma County197951%$628,900
95403Sonoma County198635%$651,900
95404Sonoma County197360%$865,900
95405Santa Rosa197274%$749,700
95407Sonoma County198939%$603,300
95409Sonoma County197952%$807,800
95412Sonoma County198243%$746,300
95419Occidental1938100%Not published
95421Sonoma County196968%$642,700
95425Sonoma County197756%$647,000
95430Sonoma CountyNot published0%Not published
95436Sonoma County196174%$704,100
95439Fulton194686%$817,800
95441Sonoma County197851%$1,277,800
95442Sonoma County196669%$1,360,500
95444Graton198050%$865,500
95446Sonoma County195782%$585,900
95448Sonoma County197656%$1,030,100
95450Sonoma County196963%$797,600
95452Sonoma County196672%$969,200
95462Monte Rio195687%$713,800
95465Sonoma County197662%$1,122,500
95471Guerneville193886%$617,500
95472Sonoma County197272%$995,200
95476Sonoma County197757%$882,300
95480Sonoma CountyNot published0%Not published
95486Monte RioNot published100%Not published
95492Sonoma County199217%$777,700
95497Sea Ranch198831%$1,198,200

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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Santa Rosa-Petaluma, CA

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