Mold Removal Cost In Ontario, CA

A typical professional mold job in Ontario runs about $1,600 to $6,400 before rebuild. Ontario sits in San Bernardino County.

1980Median year homes were built

51%Homes built before 1980

43%Homes rented, not owned

$568,000Median home value

54,951Housing units

178,347People

Figures for Ontario city from Census ACS 2019 to 2023.

Half the homes in Ontario were built before 1980, and 51 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 43 percent of homes in Ontario are rented, so most households here carry an owner's policy on the building itself.

Typical Prices In Ontario

JobSizeNational RangeOntario Estimate
Mold Remediationa typical professional job$1,500 to $6,000$1,600 to $6,400
Mold Remediationan attic$2,000 to $7,500$2,150 to $8,000
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 $1,050
Mold Inspection and Testinga clearance test$300 to $800$300 to $850

Estimate is the national range times 106.4 divided by 100, the price level for Riverside-San Bernardino-Ontario, 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 $6,400, that cap falls short by about $1,400 at the top of that range. Read the form

Water Hazards FEMA Rates Here

FEMA rates San Bernardino 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 floodingVery High
Coastal floodingNot Applicable
HurricaneNo Rating
Cold waveRelatively Low
Winter weatherRelatively Low

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

ZIP Code Neighborhoods In Ontario

ZIPMedian Year BuiltHomes RentedMedian Home Value
91761198532%$590,000
91762197442%$568,700
91764197755%$524,100

California Rules On Mold

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