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 estimateTrusted Mold Remediation for San Antonio Homeowners
Mold Remediation in San Antonio typically costs between $1,200 and $4,500 for a contained area, and most jobs are underway within 24 to 48 hours. That range covers the inspection, containment, removal, and drying – the things that actually solve the problem rather than just spraying over it. At Marsh Water Damage San Antonio, we’ve been handling mold since 2005, and in this climate, that means we’ve seen just about every way humidity and a slow leak can turn into a wall full of trouble. Our crews show up with a written scope and a written price before anything gets torn out.
If you’re standing in a room that smells like a wet basement even when it’s dry outside, or you’ve spotted staining spreading across drywall, call (325) 252-3917. A live person answers, day or night.
Mold Removal Service
Mold Removal is exactly what it sounds like: the physical removal of mold growth from building materials and the treatment of surfaces so it doesn’t come back. You need it when visible mold covers more than about 10 square feet, when it keeps returning after cleaning, or when it’s growing behind walls where you can smell it but not see it. In San Antonio, small contained jobs often run $1,200 to $2,500, while whole-room removals with containment typically land between $3,000 and $4,500. Marsh Water Damage San Antonio gives you a written price before the first sheet of drywall comes down.
Containment and Air Control
Before we remove anything, we seal the work area with 6-mil polyethylene and run negative air machines to keep spores from drifting into the rest of your home. This is standard on every job, not an upgrade.
In older San Antonio homes with pier-and-beam foundations, we also check the crawlspace airflow because that’s where half the moisture problems actually start.
Source Removal, Not Just Bleach
Mold roots into porous materials. Spraying bleach on drywall kills the surface but leaves the colony alive underneath, and it comes back. We cut out affected drywall, insulation, and carpet pad, then sand and treat the framing.
Every removal job ends with a HEPA vacuum pass and an air scrubber running overnight to pull residual spores from the air.
Restoration work we handle
Mold Remediation Services
Mold remediation services cover the full job: finding the water source, containing the affected area, removing contaminated material, treating what’s left, and drying the structure to a point where mold can’t thrive. You need this level of service after a hidden leak in San Antonio, where our high humidity and warm temperatures let mold colonize in 24 to 48 hours. Expect to pay $1,500 to $6,000 depending on how far the damage has spread; see our Mold Remediation cost guide for more detail. Marsh Water Damage San Antonio documents every step with photos, so your insurance adjuster sees exactly what we saw.
Moisture Source Tracing
Mold is a symptom. The water is the problem. Our IICRC-credentialed techs use thermal imaging cameras and moisture meters to trace the moisture path back to the source, whether it’s a pinhole pipe leak inside a wall cavity or condensation building up around an AC chase.
In San Antonio, we regularly find bathroom exhaust fans venting into the attic instead of outside, which is a mold factory waiting to happen.
Post-Remediation Verification
After removal and drying, we take psychrometric readings (measuring the moisture in the air and materials) to confirm the structure has reached a dry standard. San Antonio’s ambient humidity makes this step non-negotiable.
You get a written report with before, during, and after photos plus the final moisture numbers, and it’s included in the price you signed before we started.
What happens when you call
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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.
Professional Mold Removal
Professional mold removal means a trained crew with containment equipment, commercial-grade air scrubbers, and the knowledge to remove mold without spreading it through your home. It’s the right choice when mold covers a large area, when it’s in your HVAC system, or when someone in the house has asthma, allergies, or another respiratory condition. In San Antonio, professional removal runs $2,000 to $5,000 for most residential jobs. Marsh Water Damage San Antonio sends you the technician’s name and photo before we arrive, so you know exactly who’s at your door.
The Threshold Standard at Every Visit
Every technician Marsh sends to your San Antonio home is background-checked, identity-verified, and photo-badged. You get a text with their name and picture before the visit, and they show the same badge at the door, every single time.
That’s the Threshold Verified protocol, and it exists because letting a stranger into your home to tear out walls is already hard enough without wondering who that stranger is.
Equipment That Matches the Big Guys
We run Dri-Eaz and Phoenix dehumidifiers, XPOWER air movers, and B-Air scrubbers, the same gear large commercial restoration firms deploy on hospital and school losses. Residential jobs don’t get the leftover equipment.
Our techs hold IICRC, RIA, and IFA credentials, which means they’ve been trained to the standards the restoration industry actually recognizes.
Mold Inspection
A Mold Inspection & Testing is a systematic search of your home for visible mold, hidden moisture, and the conditions that let mold grow. You need one when you smell must or you’ve had a leak but can’t see any growth, when you’re buying or selling a home in San Antonio, or when you suspect a past water event wasn’t dried properly. A visual inspection with moisture mapping typically runs $250 to $500, while adding air sampling can push it to $600 to $900. Marsh Water Damage San Antonio includes a written inspection report with photos and a clear recommendation, not a sales pitch.
Where We Look
In San Antonio homes, we check the obvious places first: under sinks, behind toilets, around windows, and along baseboards. Then we get into the less obvious spots: inside HVAC closets, attic sheathing, crawlspaces, and the wall cavities behind water heaters and washing machines.
On older homes in Alamo Heights and Terrell Hills, we pay close attention to original plaster walls, which hide moisture differently than modern drywall.
What the Report Tells You
You get a clear list of what we found, where the moisture is coming from, what the mold looks like, and what we recommend, with a price for each step if work is needed. No vague warnings. No urgent upselling.
If the inspection shows no mold, we’ll tell you that and explain what you’re smelling instead, whether that’s a dry P-trap or old carpet. That honesty matters more than making a sale.
Mold Removal Specialist
A mold removal specialist is a technician with specific training in mold behavior, removal protocols, and moisture control, not a general handyman with a spray bottle. You want a specialist when mold is extensive, when it’s in multiple rooms, or when a previous attempt to clean it failed. Specialist-led removal in San Antonio generally runs $2,500 to $5,500 depending on square footage and whether containment is needed. Tobias Reyner, the owner at Marsh Water Damage San Antonio, selects every specialist we send out, and their credentials come with them.
Training That Shows in the Work
Our specialists hold certifications through IICRC and RIA, which cover applied microbial remediation, water damage restoration, and the proper use of professional drying equipment. That training means they know how to set up proper containment, how to read moisture meters correctly, and when a material can be saved versus when it has to go.
In a city like San Antonio, where the humidity never fully quits, that distinction saves you money and prevents repeat problems.
What a Specialist Actually Does
A mold removal specialist identifies the full extent of the growth, sets up the containment barrier, removes contaminated materials, treats remaining surfaces with an EPA-registered antimicrobial, and verifies the area is dry. Then they document everything.
This isn’t a one-hour job and it shouldn’t be. Proper removal takes time, and a specialist who rushes is a specialist you’ll be calling again in six months.
Black Mold Removal
Black mold removal is the targeted removal of Stachybotrys chartarum, the greenish-black mold that feeds on cellulose materials like drywall and wood after prolonged water exposure. You need professional black mold removal whenever you see dark, slimy or sooty patches, particularly if they follow a long-standing leak. In San Antonio, black mold jobs typically cost $2,500 to $6,000 because the affected drywall almost always has to come out. Marsh Water Damage San Antonio treats every dark mold as if it’s toxigenic until proven otherwise, which is the only safe way to handle it.
Why Black Mold Gets More Careful Handling
Black mold produces mycotoxins that can cause respiratory irritation, coughing, and other symptoms in some people. We set up full containment with negative air pressure, use HEPA air scrubbers, and remove affected materials in sealed bags.
Attempting to scrub black mold off drywall is risky. It spreads spores into the air and leaves the roots behind. The material comes out, and the framing gets treated.
Testing and Verification
After black mold removal in a San Antonio home, we recommend post-remediation verification to confirm spore counts inside the contained area are back to normal background levels. We use an independent environmental lab for the analysis, so the results come from a third party.
That written confirmation is also useful if you ever sell the home and a buyer asks about past mold issues. You’ll have the paperwork to show the job was done right.
Mold Removal Contractor
A mold removal contractor is a licensed, insured professional who manages the entire remediation project from inspection through final verification. You need a contractor rather than a handyman when the job involves structural materials, when insurance is involved, or when you need documentation that the work meets industry standards. In San Antonio, contractor-led mold remediation projects average $3,000 to $7,000 depending on scope. Marsh Water Damage San Antonio provides a written scope of work, a written price, and a written 365-Day Done Right Promise on every contract.
Licensing, Insurance, and Paperwork
We carry general liability and pollution liability insurance, and every job gets documented with photos, moisture readings, and a final report. If your insurance is covering the loss, we coordinate directly with your adjuster and provide the paperwork they need.
In Texas, mold remediation contractors are regulated, and we operate within those rules without cutting corners. That means proper containment, proper disposal, and proper documentation on every job.
The Contract You Actually Want to Sign
Most horror stories about mold contractors start with a vague verbal estimate and end with a bill double what was discussed. Our contract lists every step, every material, and every dollar before you sign.
If the repair isn’t right within a full year, Marsh makes it right. That’s a free second visit, automatically included, printed on the work order. Tobias Reyner has run the business this way since 2005 because it’s the only way that survives two decades in San Antonio.
Bathroom Mold Removal
Bathroom mold removal addresses the most common mold location in San Antonio homes: shower walls, grout lines, ceilings above the tub, the cabinet beneath the sink, and the drywall behind the toilet. You need it when you see recurring black spots on grout or caulk, when the paint on the ceiling peels and darkens, or when the bathroom smells musty even after cleaning. Small bathroom jobs run $800 to $2,000; larger jobs involving drywall replacement and plumbing repairs can reach $4,000. Marsh Water Damage San Antonio gets to the water source first, because cleaning mold in a bathroom without fixing the moisture is just redecorating.
Exhaust Fan and Ventilation Checks
Half the bathroom mold we see in San Antonio traces back to an exhaust fan that isn’t moving air. Either it’s undersized, it vents into the attic instead of outside, or it’s so packed with dust that it’s doing nothing.
We check airflow with a manometer and inspect the duct run before we touch the mold. Fixing the ventilation is part of the job, not an optional add-on.
Grout, Caulk, and What Can Be Saved
Mold in non-porous grout can often be professionally cleaned and sealed. Mold in caulk means removing and replacing the caulk. Mold on drywall means cutting it out, because drywall is food for mold.
We’ll tell you which category your bathroom falls into before we start, and the price you signed is the price you pay, even if it’s worse than we thought.
See the difference
Before
After
Before
After
Before
AfterBrands We Service
We’ve done mold remediation in homes with every common HVAC and plumbing setup you’ll find in San Antonio, from older Carrier and Lennox systems to newer Trane and Rheem units in the newer subdivisions around Converse and Universal City. Our techs know the condensation pan layouts and duct chase designs on these systems, which matters because HVAC condensate is a top-three mold cause in this climate.
We also handle mold around all major plumbing brands, including Delta, Moen, and Kohler fixtures, where slow valve leaks or bad seals have fed mold inside vanities and behind toilets. Whether the source is a high-end Trane air handler or a builder-grade Moen supply line, the process is the same: stop the water, remove the mold, dry the structure, and document everything.
Signs You Need a Pro Right Now
- A musty smell that won’t go away. That smell is microbial volatile organic compounds, which means mold is actively growing somewhere. In San Antonio’s humidity, it’s usually behind a wall or under flooring, not out in the open.
- Staining or discoloration on drywall. Brown, black, or green staining that spreads over time is mold feeding on the paper in your drywall. By the time you see it, the colony behind the paint is usually much larger than the visible spot.
- You had a water leak, and nobody dried it professionally. If a pipe leaked, a toilet overflowed, or a storm pushed water inside, and the area was just toweled up and left, mold has a 24-to-48-hour head start. In San Antonio, that’s basically a guaranteed bloom.
- Visible mold around windows, baseboards, or AC vents. Condensation on windows and supply registers is a sign of excess indoor humidity. Where moisture collects, mold follows, especially around window frames and duct openings.
- Family members suddenly have allergy symptoms at home. If coughs, sneezing, headaches, or itchy eyes calm down when you leave the house and come back when you return, hidden mold could be the culprit. A professional inspection can confirm or rule it out.
Our Process, Step by Step
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The assessment. We start with a full inspection using thermal imaging to find moisture behind walls and moisture meters to map the affected area. You get a written report and a written price before any work starts. No surprises after demo begins.
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Containment setup. We seal the work area with 6-mil plastic and set up negative air machines with HEPA filtration. This keeps mold spores from spreading to the rest of your San Antonio home while we work.
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Source removal. Contaminated drywall, insulation, carpet pad, and other porous materials come out in sealed bags. Remaining framing gets sanded, HEPA-vacuumed, and treated with an EPA-registered antimicrobial. This is the step that actually solves the problem.
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Drying and structural drying verification. We place Dri-Eaz and Phoenix dehumidifiers and XPOWER air movers, then monitor daily with moisture meters and psychrometric readings. The structure isn’t done until the numbers say it’s dry, not just the surface.
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Final verification and repair scope. We confirm the area is dry and mold-free, run post-remediation air sampling if needed, and provide documentation for your records and your insurance company. If you need rebuild work, we’ll give you a clear repair scope. The 365-Day Done Right Promise is printed on your work order, and it means what it says.
How Much Does Mold Remediation Cost in San Antonio?
A typical one-room mold removal in San Antonio runs $1,200 to $3,500 depending on whether containment is needed and how much drywall has to come out. A whole-bathroom job with plumbing repair behind the wall usually lands between $2,500 and $4,500. Larger jobs, like a crawlspace with widespread growth or a multi-room loss from a hidden leak, run $4,500 to $7,000, and add testing if you want post-remediation verification.
What moves the price: how much square footage is affected, whether the mold is behind walls or in a crawlspace, whether HVAC ductwork needs cleaning, and how long the area takes to dry. In San Antonio, houses built on slab foundations tend to trap moisture differently than pier-and-beam, and that affects drying time and cost.
The way to avoid overpaying is to get a written scope with a line-item price before work starts and to ask what’s included in the quote. Our free estimate includes the inspection, the moisture mapping, the written scope, and the written price. If you’re comparing bids, ask whether containment, air scrubbing, and drying are included or billed separately. They’re included in ours.
Call (325) 252-3917 for an exact quote on your San Antonio mold problem. Estimates are free, and a live person answers the phone.
Our Service Area Near San Antonio
Marsh Water Damage San Antonio serves the entire San Antonio metro, including Mold Remediation in Selma, Mold Remediation in Boerne, Converse, Kirby, Terrell Hills, Universal City, Lackland AFB, Alamo Heights, Castle Hills, Leon Valley, and Windcrest. In most of these areas, we can have a technician on site within 2 to 4 hours of your call, because the trucks are already in the neighborhood. If you’re dealing with mold growing from a leak, that response time matters. Mold doesn’t pause while you wait for a callback.
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.
Frequently Asked Questions About Mold Remediation in San Antonio
Mold remediation is the process of identifying the moisture source, containing the affected area, physically removing contaminated materials, treating remaining surfaces, and drying the structure to prevent regrowth. It’s different from mold cleaning, which only addresses surface growth. Remediation addresses the roots of the problem, which in San Antonio almost always means fixing a water source and a ventilation issue along with the visible mold.
Most one-room jobs in San Antonio take 2 to 4 days from setup to final drying verification. Larger jobs involving multiple rooms or crawlspaces can take 5 to 10 days. The drying phase usually takes longer than the removal itself in this humid climate. We monitor moisture daily and won’t call the job done until the meters confirm the structure is dry.
Expect $1,200 to $4,500 for a typical contained area, and $4,500 to $7,000 for larger multi-room jobs. The variables are square footage, whether drywall must be removed, whether ductwork needs cleaning, and drying time. You’ll get an exact written price after our inspection, before any work begins. Call (325) 252-3917 for a free estimate.
Yes. We provide mold remediation across the San Antonio metro including Selma, Boerne, Converse, Kirby, Terrell Hills, Universal City, Windcrest, and Alamo Heights. We’re already working in these neighborhoods regularly, so response times are typically 2 to 4 hours. Call (325) 252-3917 and a live person will schedule your visit.
Mold from an active water leak is an emergency, and we treat it as one. A live person answers at (325) 252-3917 24 hours a day, 7 days a week, including holidays. If you have active water feeding mold growth, turn off the water source if you can do so safely, and call us. We’ll get a technician dispatched the same day in most San Antonio neighborhoods.
Every mold remediation job from Marsh Water Damage San Antonio carries the 365-Day Done Right Promise, which is printed on your work order. If the repair is not right within a full year, we make it right, and the second visit is automatically free. You don’t have to argue for it or prove anything beyond showing us what’s wrong. That’s the guarantee Tobias Reyner has stood behind since 2005.
Clear a path to the affected area, move personal items at least 6 feet away from the workspace, and plan to stay out of the contained area while work is underway. If your mold is near a bathroom or kitchen, we’ll let you know if you need to avoid using those rooms while containment is up. We handle everything else, including protecting your floors and furniture with coverings before the work begins.
Schedule Your Mold Remediation Service in San Antonio Today
You don’t have to live with mold, and you don’t have to wonder who’s showing up to fix it. Call (325) 252-3917 now for a free, no-obligation estimate on mold remediation in San Antonio. A live person answers 24/7. You’ll get a written price before any work starts, and a written 365-Day Done Right Promise stamped on the work order when we’re done.
Written by Tobias Reyner, Owner at Marsh Water Damage San Antonio, serving San Antonio since 2005.