0 Best Mold Assessment Pros in Castro Valley, CA (Verified 2026)

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California Mold Information

Climate Zone

Pacific Coastal

Varies widely by subregion (40-75% average)

Humidity Level

Varies widely by subregion (40-75% average)

Common Mold Types

Cladosporium, Penicillium, Aspergillus

Weather Considerations

Diverse microclimates from desert to redwood coast. Northern California sees more rain and mold risk. Southern California has wildfire-related water damage from suppression. Central Valley has agricultural humidity.