Mold remediation
Water damage drying
Fire & smoke cleanup
Storm response
Sewage cleanup
ReconstructionFree visual inspection and a written scope of work before any mitigation begins - photos, moisture readings, and drying logs go in your claim file
The scope we write is the scope we bill. Anything new gets shown to you, in writing, before we touch it.
Get your free estimateFast, Reliable Mold Remediation Across Ontario
Mold remediation in Ontario, CA typically costs $2,100 – $6,400 depending on square footage, containment needs, and whether asbestos abatement is required first. Most jobs in Ontario’s older tract homes take 2 – 5 days from containment to clearance testing. If you’ve found mold, smelled a musty odor, or had water damage that was never properly dried, call (877) 358-7678 now. Waiting gives the colony time to spread into wall cavities and under flooring. We work throughout Ontario daily, from the 91762 bungalows near Euclid Avenue to the newer PEX-plumbed subdivisions north of the 10, and we know exactly what these homes throw at a remediation crew.
Why San Bernardino Restoration Co Is Ontario’s Preferred Mold Remediation Company
Ontario homeowners don’t need a generalist contractor who occasionally wipes down a moldy wall. They need a team that understands what’s actually behind the drywall in a 1958 stucco tract home off Holt Boulevard versus a 2015 post-tension slab build in the north Ontario hills. That’s what we bring to every job in this city. Our IICRC-certified technicians follow a documented protocol on every project: containment first, moisture mapping with professional meters, negative air pressure throughout, and daily drying logs that insurance adjusters can actually use.
Noel Armenta, our owner, has built the company around a simple rule: if you can’t prove the moisture is gone with readings, the job isn’t done. That’s why we run Dri-Eaz and Phoenix dehumidifiers alongside XPOWER air movers on Ontario jobs, the same equipment you’d see on a commercial warehouse loss. No consumer-grade rentals. No guesswork. When we finish in Ontario, you get a written record: before photos, moisture readings from day one through clearance, and the antimicrobial treatment log. That documentation matters here more than most people realize, especially in older homes where the insurance carrier wants to see exactly what was found behind the baseboards.
We’re also a Mold Remediation in Ontario team that shows up with the full picture. Many Ontario homes in ZIP codes 91764 and 91762 carry asbestos-containing materials under the flooring. If we find that, we know how to sequence abatement before drying so the job is done legally and safely. That’s local knowledge that comes from working in this city, not from a franchise playbook.
Restoration work we handle
Mold Removal Service in Ontario
Mold Removal Service in Ontario means physically removing the contaminated material, not just spraying it with bleach and hoping the staining goes away. In most Ontario homes we remove drywall, insulation, carpet pad, and baseboard in the affected area, bag the material inside a contained zone, and run negative air to prevent spore spread during tear-out. A typical mold removal case in a single bathroom or water closet in Ontario runs $1,800 – $3,400. When the growth has crossed into an adjoining wall cavity or under multiple rooms of flooring, the job climbs to $4,000 – $6,200.
Tear-Out and Containment
We set 6-mil poly containment with a negative air machine pulling 2,000 – 4,000 CFM depending on room volume. Every opening gets sealed, including the HVAC register if it’s within the zone. In Ontario’s older homes, we check for blown-in insulation behind the wall before cutting. That stuff holds moisture and needs its own removal plan.
Antimicrobial Treatment
After tear-out, we treat exposed framing and the back side of remaining materials with an EPA-registered antimicrobial. Then we dry the cavity to a verified moisture content before rebuilding starts. This isn’t something a handyman can do with a spray bottle and a fan.
Mold Remediation Services in Ontario
Mold Remediation Services in Ontario go a step beyond removal: we identify the moisture source that fed the colony, correct it, then restore the space to a condition where mold can’t return. That source is often hidden. In Ontario’s 1950s tracts, the culprit is usually a pinhole leak in an original galvanized supply line under the slab. If that leak isn’t repaired first, the mold comes back under the same tile within months. Our full Mold Remediation process includes source correction, containment, tear-out, drying, antimicrobial treatment, and clearance verification.
Sub-Slab Leak Sequencing
We coordinate with a licensed plumber for the leak repair and then map the moisture plume with professional meters in a grid across the slab. In older Ontario homes, the wet area is usually larger than the visible damage. Drying those slabs takes longer than wall cavities, and we document every reading.
Post-Remediation Verification
Before we remove containment, we pull air samples inside the zone and compare them to an exterior baseline. The goal is indoor spore counts at or below outdoor levels. If the numbers don’t clear, we don’t close the job. You get the lab report with your name and address on it.
What happens when you call
- 1
A real person answersNo phone trees — you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Ontario
We service homes of every vintage across Ontario, and the equipment we run reflects that. Our dehumidification fleet uses Dri-Eaz and Phoenix units, with XPOWER and B-Air air movers positioned for proper airflow pattern across wet materials. For crawlspace drying under the raised foundation bungalows in the 91762 ZIP code, we run the same low-grain refrigerant dehumidifiers we’d use on a commercial loss. We stock HEPA filters, 6-mil poly, and antimicrobial treatments on trucks rolling through Ontario daily. When a job requires wall-cavity drying without tearing out every stud bay, our Injectidry system gives us an option most crews in Ontario don’t have.
Common Mold Remediation Problems We See in Ontario Homes
- Slab leaks in original galvanized supply lines. In Ontario’s 1950s tracts off Euclid Avenue and Holt Boulevard, a pinhole leak under the slab can run for months before anyone notices. By the time a floor tile pops or the water bill spikes, mold has usually colonized the subfloor and crept up the wall framing.
- Asbestos-containing vinyl and joint compound during tear-out. Homes built before 1978 in Ontario commonly have 9×9 vinyl tiles and joint compound with asbestos. If remediation starts without testing, the dry-out equipment gets set on materials that should be abated first. That’s a sequencing failure we see from less experienced crews.
- Category 1 water left too long turns Category 2. A clean supply-line break is Category 1 water, dryable in place. But once it wicks into wall cavities and sits for days in Ontario’s warm indoor temperatures, it becomes Category 2. Hidden growth behind baseboards won’t show up until the next moisture map, and that’s where we spend a lot of time mapping concealed dampness.
- Roof leaks from Santa Ana debris. Ontario sits in the Inland Empire wind corridor near Cajon Pass. Fall winds drive debris into roof drains and scuttle holes, and when rain follows, water backs up into ceilings and wall cavities. Mold grows while the drywall still looks stained but intact.
See the difference
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After
Before
After
Before
AfterPricing for Mold Remediation in Ontario, CA
Most Ontario mold remediation jobs we quote fall between $2,100 and $6,400. A single bathroom with contained tear-out and drying runs about $2,200 – $3,200. A full room with wall-cavity drying, slab moisture reading, and rebuild-ready clearance sits in the $3,500 – $5,500 range. Whole-home contamination from a long-running slab leak can reach $8,000 or higher, especially if multiple rooms need containment or asbestos abatement is required first. What moves the number: square footage, number of containment zones, whether the HVAC system is involved, and whether we need to coordinate abatement before drying can start. Call (877) 358-7678 for a free estimate. We’ll send a certified tech to Ontario, inspect the damage, and give you a written scope before any work begins.
We Also Serve Cities Near Ontario
San Bernardino Restoration Co serves the Ontario area daily, and we take calls from homeowners throughout the surrounding communities. If you’re in Montclair, Upland, Chino, or San Antonio Heights and you’ve found mold or water damage, call (877) 358-7678. The same IICRC-certified team and professional-grade equipment covers those cities too, with the same documentation and direct insurance coordination.
Serving Ontario, CA — Our Local Coverage Area
We’re based in the Ontario area and know this community well. Use the map below to see our service coverage — if you’re nearby, we can almost certainly help.
FAQs About Mold Remediation in Ontario
In Ontario’s 1950s and 1960s tract homes, asbestos-containing 9×9 vinyl floor tiles and asbestos joint compound were standard materials. Mold remediation crews can’t legally set drying equipment on those materials or tear them out without abatement protocols. So the sequence is: containment first, then asbestos testing, then abatement, and only then do we map moisture and begin drying. Skipping this step is a legal and health risk, and we’ve followed this two-trade sequence on many jobs in the Euclid Avenue and Holt Boulevard tracts. Call (877) 358-7678 and we’ll walk you through what your home’s vintage likely means for the job.
You may never smell it. In slab-on-grade Ontario homes, moisture from a pinhole leak in an original galvanized line wicks upward into the subfloor and wall framing, but the colony can stay behind baseboards and under tile where air exchange is low. By the time a musty odor is noticeable, growth often covers far more area than the stain suggests. That’s why we moisture-map the entire room, not just the wet spot. If you’ve had a recent water bill spike, call us for a moisture inspection.
Yes. North Ontario’s newer construction uses PEX supply lines and post-tension slabs, which fail differently than the galvanized pipe in the older tracts. Leaks in these homes are less common but when they occur, the cable-tensioned slab can’t be cut into without specialized leak detection first. Mold remediation still follows the same containment and drying protocol, but the source correction step looks different. We coordinate with slab specialists who understand post-tension construction so nobody cuts a cable.
Not if it’s been sitting. Category 1 water from a clean supply line is safe to dry in place only if it’s addressed within 24 to 48 hours. In Ontario’s climate, indoor temperatures keep water in wall cavities warm long enough for bacteria to multiply, which downgrades the water to Category 2 or even 3. When that happens, wet materials can’t just be dried; they need antimicrobial treatment or removal. This is one of the most common mistakes we see on older Ontario jobs that started as a “small leak” and were left to air dry. Call us at (877) 358-7678 and we’ll tell you honestly whether it’s dryable or needs tear-out.
Yes, and it does in Ontario. The wind corridor near Cajon Pass pushes dust, leaves, and debris into roof drains and scuppers every fall. When rain follows, the backed-up water finds its way through cracked flashing or compromised underlayment and into the ceiling cavity. We’ve remediated mold in a roof leak only to have the homeowner call again a year later because the same drain clogged. The fix is remediation plus a maintenance plan for the roof drainage. When we finish an Ontario job, we point out anything that will feed the next problem.
Call San Bernardino Restoration Co for Mold Remediation in Ontario
If you have mold in your Ontario home, don’t spray it and hope. Get a documented, IICRC-certified remediation that your insurance carrier will recognize and your family can breathe around. We handle everything from the initial inspection and moisture mapping through containment, drying, treatment, and clearance. Noel Armenta and our full Mold Remediation team work in Ontario every week, from the old bungalows off Euclid to the newer subdivisions north of the 10. Call (877) 358-7678 now for a free estimate. We’ll get a certified tech to your door, assess the damage honestly, and put the scope in writing before any work starts.
Written by Noel Armenta, Owner at San Bernardino Restoration Co, serving Ontario since day one.