Water damage drying
Fire & smoke cleanup
Mold remediation
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 San Antonio
Mold remediation in San Antonio typically costs between $1,800 and $6,500 for a contained removal with air scrubbing, depending on how far the growth has spread and whether it’s behind drywall or in a crawl space. Most jobs we handle in San Antonio are completed within 3 to 5 days, and we can usually have a crew at your door within 24 hours of your call. If you’re dealing with visible mold, a musty smell that won’t go away, or water damage from a recent storm, call (325) 252-3917 and a live person will pick up, day or night.
We’ve worked in San Antonio long enough to know that mold here doesn’t behave the way it does in Dallas or Houston. The heat holds moisture in wall cavities longer. The limestone in older neighborhoods breathes differently than the synthetic stucco wrapping new production homes. And the growth window after a water event is brutally short. You need a crew that knows the local building stock, not a generic restoration script.
Why Marsh Water Damage San Antonio Is San Antonio’s Preferred Mold Remediation Company
Since 2005, Marsh Water Damage Restoration has handled mold and water losses across San Antonio as part of the Threshold Group family of restoration companies. Our name isn’t decoration: a marsh is low, wet ground, water where it shouldn’t be. That’s what we deal with every day. Tobias Reyner, who leads our technical team, has built the crew around one principle: you should know exactly who is walking through your door before the knock happens.
Every technician we send into a San Antonio home is background-checked, identity-verified, uniformed, and photo-badged under the Threshold Verified standard. Before a tech arrives, you get their name and photo. At the door, they show a photo ID badge. Every time. Not just on the first visit. That matters to parents with young kids, people who are home alone during the day, and older homeowners who have every right to be cautious about opening the door to a stranger.
Our work is backed by the 365-Day Done Right Promise, printed on every work order. If the mold removal is not right within a full year, we make it right, and a free second visit is included automatically. You never have to argue for it. You also get a written price before any work starts. No estimate that balloons after demo begins.
Restoration work we handle
Mold Inspection in San Antonio
Mold Inspection in San Antonio should start with the question every homeowner in this city needs to ask: where is the moisture coming from? In San Antonio, we frequently find the answer in places you wouldn’t look first: a failed T&P valve on an attic water heater in Alamo Ranch, condensation inside a pier-and-beam crawl space in King William, or a drainage issue behind synthetic stucco in a newer subdivision off Culebra Road.
A proper mold inspection in San Antonio runs $350 to $650 for a visual assessment with moisture mapping and air sampling. That’s the number you should expect from a credentialed firm, not a $99 special that turns into an upsell. We document findings with photos and give you a written report that separates active growth from staining, so you know if remediation is even necessary.
Moisture Mapping Before Anything Else
We run moisture meters across walls, ceilings, and floors to find wet pockets that aren’t visible yet. In a two-story drywall cavity after an attic water heater failure, moisture can sit between floors for days before a stain appears. By then, mold is already establishing.
Air Sampling and Lab Analysis
When we see suspicious growth, we collect air samples inside and outside the home and send them to a third-party lab. This tells us whether spore counts indoors are elevated compared to the outdoor baseline, which is the only meaningful comparison. You can’t judge a problem by a single number.
Mold Removal Specialist in San Antonio
A Mold Removal Specialist in San Antonio has to deal with the city’s split personality: historic limestone homes with lime plaster on one side of town and brand-new production homes with synthetic stucco and slab foundations on the other. Each one fails differently, and each one requires a different containment and treatment approach.
Mold removal in San Antonio generally runs $1,800 to $6,500 for a contained job with air scrubbing, HEPA vacuuming, and disposal of affected porous materials. The range reflects how much drywall, insulation, or framing has to come out. If the crawl space is involved, the cost climbs toward the top of that range because underfloor work is slower and requires encapsulating the space after treatment.
Containment and Negative Air
Before we remove anything, we seal the affected area with plastic sheeting and set up negative air pressure so spores don’t drift into the rest of your house. This matters in San Antonio’s open-plan ranch homes, where a single infected wall cavity shares air with the kitchen, the hallway, and your kids’ bedrooms.
Material-Specific Antimicrobial Treatment
Wood framing, drywall, and masonry each respond to different antimicrobial products. Injected foam will not reach the underfloor cavities of a pier-and-beam crawl space in Monte Vista. We match the treatment method to the material, because treating the surface while mold thrives underneath the floor is not remediation. It’s theater.
Trusted Brands We Service in San Antonio
We don’t sell equipment, but we operate it, and we’ve chosen gear that performs in San Antonio’s climate. Our technicians run Dri-Eaz dehumidifiers and PHOENIX air movers on structural drying jobs, with Injectidry systems for pulling moisture from wall cavities and underfloor channels. Our team holds IICRC and RIA credentials, the restoration industry’s recognized training bodies, and we apply commercial-grade standards to residential work. For San Antonio homeowners, that means the same drying logic a hospital or office building gets, scaled to your living room. We keep common replacement parts and supplies in our local inventory, so a mid-job supply run doesn’t stall your remediation.
Common Mold Remediation Problems We See in San Antonio Homes
- Attic water heater failures in newer subdivisions. Alamo Ranch, Westcreek, and other newer neighborhoods commonly place water heaters in attics. A failed T&P valve sends water cascading through two stories of drywall, and San Antonio’s summer heat turns that soaked cavity into a mold incubator within 24 to 48 hours.
- Flash flood intrusion through drainage and grade issues. San Antonio sits on the edge of Flash Flood Alley. When intense rain overwhelms drainage, Category 2 water enters slab-on-grade homes through baseboards and door thresholds, and hidden mold behind synthetic stucco follows within days.
- Limestone and lime plaster complications in historic districts. King William and Monte Vista homes built with limestone and original lime plaster need different antimicrobial approaches than gypsum drywall in newer builds. Treating historic materials with the wrong chemistry can damage the plaster and leave mold alive underneath.
- Slab-on-grade construction hiding underfloor moisture. Many mid-century brick veneer ranch homes in San Antonio sit on slabs with no crawl space, which sounds simple until a plumbing leak saturates the subfloor from below. That trapped moisture feeds mold in the flooring and baseboards and won’t resolve with surface treatment alone.
See the difference
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AfterPricing for Mold Remediation in San Antonio, TX
You should know the numbers before you call. A mold inspection with moisture mapping and lab air sampling runs $350 to $650. Mold removal on a contained space, like a single closet or bathroom corner, starts around $1,800. A full-room remediation with drywall removal, structural drying, and air scrubbing lands between $3,200 and $6,500. Crawl space treatment and encapsulation add $2,000 to $5,000 depending on square footage and access. The biggest cost driver is how much porous material has to go: drywall and insulation are cheaper to remove than to pretend they can be saved. Every San Antonio job gets a written price before work starts, and that price is the price. Call (325) 252-3917 for a free estimate.
We Also Serve Cities Near San Antonio
Our crews work beyond the city limits for homeowners who need Mold Remediation in surrounding communities. We regularly handle jobs in Converse, Universal City, and Boerne, with the same Threshold Verified techs and the same written-price guarantee. If you’re in one of those areas and dealing with mold after a storm or a plumbing failure, San Antonio dispatch can get a crew to you fast.
Serving San Antonio, TX - Our Local Coverage Area
We’re based in the San Antonio 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 San Antonio
Mold can begin colonizing within 24 to 48 hours in an Alamo Ranch home after an attic water heater leak, because San Antonio’s summer heat and humidity keep drywall cavities warm and moist around the clock. Once the T&P valve fails and water pours through two stories of framing, the clock is already running before you see the first ceiling stain. Call (325) 252-3917 as soon as you notice water, and we’ll get containment set before the growth window closes.
Category 2 water means significantly contaminated water that can carry bacteria and organic matter, and in a slab-on-grade San Antonio home, it usually enters through baseboards, door thresholds, and weep holes during flash flood events. That water wicks into drywall and flooring and creates the conditions for mold growth behind surfaces you can’t see. Remediation in this situation requires removing saturated porous materials and treating the wall cavity, not just drying the visible surface. Estimates are free: call (325) 252-3917.
Yes, historic limestone homes in King William need different mold remediation than newer production homes, because original lime plaster and soft limestone breathe differently than gypsum drywall wrapped in synthetic stucco. Using the wrong antimicrobial chemistry on lime plaster can etch the surface and leave mold alive inside the pores of the material. We match the treatment method to the building material, and we’ve done enough work in King William and Monte Vista to know what that material is before we open the wall.
We verify mold is gone by running a post-remediation air sample and comparing indoor spore counts to an outdoor baseline taken at the same time, not by relying on a visual check alone. A surface can look clean while spores are still aerosolizing from a wall cavity or crawl space. We also confirm moisture levels have returned to normal with structural drying readings. If the numbers don’t clear, the job isn’t done, and the 365-Day Done Right Promise applies. Call (325) 252-3917 to schedule an inspection.
Structural drying is not enough for mold remediation in mid-century brick ranch homes because those slab-on-grade houses trap moisture under base plates, behind brick veneer, and beneath vinyl or tile flooring, places air movement alone cannot reach. Drying without removing saturated drywall and treating the affected surfaces just pauses the problem while mold continues growing in the hidden layers. You need actual remediation, not a fan-out. Our Mold Remediation crew in San Antonio handles this daily.
Mold Remediation San Antonio Can Trust
If you’re reading this at 2 a.m. because a water heater burst in your attic, someone answers our phone at 2 a.m. That’s how we’ve operated since 2005. Tobias Reyner and the team at Marsh Water Damage San Antonio handle mold in Alamo Ranch, King William, Monte Vista, and every neighborhood between. We’ll tell you what’s wrong, what it costs, and exactly who is showing up. Before they knock, you’ll know their name and see their face. Call (325) 252-3917 now for a free estimate and a written price before any work begins.
Written by Tobias Reyner, Owner at Marsh Water Damage San Antonio, serving San Antonio and surrounding communities since 2005.