Urgent response
Start here when there is active water damage, a fast-spreading issue, or a time-sensitive repair.
2local
Ask how quickly they can inspect the property and whether after-hours response is available.
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Mold remediation companies serving Ontario, CA
Compare mold remediation providers with strong local signals for Ontario, CA. Broader area options are included when the service-area data suggests they may cover the city.
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Showing all listed providers for Ontario. Pick a job type to focus the shortlist.
Strong local matches 2
Broader options 0
Public reviews 1453
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Mold jobs are not all the same. For Ontario, CA, start with the signals that match the problem you need solved, then confirm exactly what work is included before booking.
Containment methods
Useful when mold may need isolation from clean areas during removal.
2local
Ask what containment, air movement, or negative-air process is included in the work.
Moisture-source checks
Important when mold appears after a leak, flood, roof issue, or damp basement condition.
2local
Ask how they identify and address the moisture source before or during remediation.
Testing or inspection
Helpful when you need inspection, sampling, or clearance questions separated from removal work.
2local
Ask whether testing is included, handled separately, or referred to an independent process.
Strong local matches
Strong local matches for Ontario
Best for: Ontario and Inland Empire homeowners dealing with water damage that led to mold, who want one company to handle plumbing repair, water extraction, and mold remediation under a single call.
Service area: Headquartered in Ontario, California. The Ontario branch lists specific cities including Ontario, Chino, Claremont, La Verne, Mira Loma, Montclair, and Upland. The broader Anaheim metro service area page lists coverage across four counties — Orange, Los Angeles, San Bernardino, and Riverside — with dozens of cities from Aliso Viejo to Yorba Linda. That is a very large territory for a single office location.
Plumbing + water cleanup24/7 emergency responseInsurance claim support
Review snapshot: Jose, Chris, and John draw consistent praise for clear communication and same-day fixes, but pricing complaints run through even 4-star reviews — 6 of 9 recent negatives mention overcharging or sticker shock across 1,381 total reviews at 4.8 stars.
Best for: Ontario and Inland Empire homeowners dealing with water damage that has turned into a mold problem, especially those navigating an insurance claim for the first time.
Service area: Headquartered in Ontario, California at 2125 S Hellman Ave. They claim coverage across four counties: San Bernardino (Ontario, Rancho Cucamonga, Fontana, Chino, Chino Hills, Upland, Montclair, Colton, Rialto, Redlands, Highland), Los Angeles (Pomona, West Covina, Covina, Glendora, Arcadia, Pasadena, El Monte, Baldwin Park, La Verne, San Dimas, Claremont, Walnut, La Puente, Altadena), Riverside (Banning, Beaumont), and Orange County. That is a wide area for a small crew — confirm response times for locations outside the immediate Inland Empire.
Water-to-mold recoveryInsurance claim helpSame-day response
Review snapshot: Alex draws consistent praise across 72 reviews for same-day response, honest pricing, and walking first-time claimants through the insurance process, with Fern and Robbie also named for hands-on communication. No 1-star reviews found across 72 total reviews at 4.9 stars.
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Broader area options
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