Mold Removal Cost And Risk In Contra Costa County, CA

A typical professional mold job in Contra Costa County runs about $1,750 to $6,950 before rebuild, using the San Francisco-Oakland-Fremont, CA price level. Below are the 42 ZIP code neighborhoods, the age of the homes, FEMA's water hazard ratings and California rules.

1978Median year homes were built

54%Homes built before 1980

32%Homes rented, not owned

$830,800Median home value

426,585Housing units

1,161,458People

Housing figures from Census ACS 2019 to 2023. Remediation workers here earn a median $28.65 an hour, BLS May 2025 wage survey.

Half the homes in Contra Costa County were built before 1978, and 54 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 32 percent of homes in Contra Costa County are rented, so most households here carry an owner's policy on the building itself.

Housing age swings by neighborhood. ZIP 94516 has the oldest homes here, a median year of 1938, and ZIP 94513 the newest, 2003.

Typical Prices In Contra Costa County

JobSizeNational RangeContra Costa County Estimate
Mold Remediationa typical professional job$1,500 to $6,000$1,750 to $6,950
Mold Remediationan attic$2,000 to $7,500$2,300 to $8,650
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 115.6 divided by 100, the price level for San Francisco-Oakland-Fremont, 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 $6,950, that cap falls short by about $1,950 at the top of that range. Read the form

Water Hazards FEMA Rates Here

FEMA rates Contra Costa 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 floodingRelatively Moderate
HurricaneNot Applicable
Cold waveNo Rating
Winter weatherVery Low

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

ZIP Code Neighborhoods In Contra Costa County

ZIPAreaMedian Year BuiltBuilt Before 1980Median Home Value
94505Contra Costa County199513%$787,500
94506Contra Costa County19948%$1,789,600
94507Alamo197855%$2,000,001
94509Antioch197564%$565,300
94511Bethel Island197464%$549,500
94513Contra Costa County200313%$793,900
94514Contra Costa County197853%$852,900
94516Contra Costa County193887%$786,800
94517Contra Costa County198346%$995,600
94518Concord197080%$826,500
94519Concord196086%$727,600
94520Concord197173%$572,400
94521Concord197468%$823,100
94523Pleasant Hill197162%$1,038,400
94525Crockett193881%$709,000
94526Danville197667%$1,588,000
94528Diablo198148%$2,000,001
94530El Cerrito195682%$1,097,300
94531Antioch19973%$660,200
94547Hercules198815%$741,200
94548Knightsen196960%$918,100
94549Lafayette196278%$1,968,500
94553Contra Costa County197560%$781,400
94556Contra Costa County197277%$1,594,100
94561Oakley199517%$632,100
94563Orinda196183%$1,810,100
94564Pinole197169%$697,100
94565Pittsburg198246%$563,300
94569Contra Costa County193887%$586,500
94572Contra Costa County197276%$653,500
94582San Ramon20033%$1,543,800
94583Contra Costa County198148%$1,234,400
94595Walnut Creek197073%$816,600
94596Walnut Creek197464%$1,245,000
94597Walnut Creek198147%$986,700
94598Contra Costa County197277%$1,307,100
94708Contra Costa County194489%$1,517,100
94801Richmond196563%$593,500
94803Richmond197267%$729,000
94804Richmond196076%$618,000
94805Richmond195092%$738,800
94806Richmond197062%$582,000

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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Contra Costa County Area

San Francisco-Oakland-Fremont, CA