Mold Remediation & Removal in San Antonio, TX
What it will take to fix, what it should cost, and what Texas lets you demand if you rent. Leave a number and a specialist in San Antonio calls you back.
- Know whether this needs someone today, or can wait
- Know what the work should cost before anyone quotes you
- A specialist who works where you live calls you back
How urgent is this
Get someone out today
- The affected area is larger than about ten square feet
- Water is still coming in and you cannot stop it
- It is behind a wall or under a floor and you cannot see how far it runs
- It came back after you cleaned it
It can wait a few days
- A patch of grout or caulk in a bathroom you can reach
- Surface growth on a hard, non-porous surface
- You have found the leak and already stopped it
Fix the water first. Mold that keeps getting wet comes back whatever anyone does to it, and that is as true in San Antonio as anywhere else.
What to do now
Five things that are worth doing before anyone comes out to your home in San Antonio. None of them require tools or a purchase.
- Turn off HVAC and fans. Moving air spreads spores to rooms that are still clean. Switch off central air, window units and standing fans in the affected area.
- Leave the growth alone. Do not scrub, scrape or dry-brush it, and do not tear out wet drywall or carpet before someone has looked at the extent of it.
- Find the water first. Mold follows moisture. A roof leak, a failed supply line, a cracked foundation wall or a bathroom fan vented into the attic will bring it straight back after any cleanup.
- Skip the bleach. Bleach is not the standard approach for porous materials such as drywall, framing or insulation, and it adds fumes to a room you may still need to work in.
- Photograph and document. Dated photos of the growth and of the water source help later, both with the provider scoping the work and with an insurance claim if you file one.
If the affected area is larger than a few square feet, if the water source is still active, or if you cannot tell how far it runs behind a wall or under a floor, that is the point to talk to someone who does this work.
Get help from a specialistTell us what you are looking at in San Antonio
Five short questions, then your number. The call comes from someone who works in San Antonio and knows how buildings fail in Texas — and you take it already knowing what the work should cost.
- The call comes from the person who would do the work, not from a dispatcher
- They already know what you answered, so you are not starting over
- You decide after that call. Nothing is booked by sending this.
What it costs
Those are national figures. We publish no prices for San Antonio: no sourced data supports them, and a number invented for a city is worse than no number. The full comparison is on mold removal cost and inspection and testing cost; the number for your house comes from the provider after they have seen it.
If you rent in Texas
If you rent in Texas, the first thing to know is that mold is not named in the statute. A landlord’s repair duty covers conditions that materially affect the physical health or safety of an ordinary tenant, and the examples the law spells out are raw sewage, flooding, broken heating or cooling, and lack of potable water. Mold has to be shown to meet that standard rather than simply being pointed at.
The practical route is an inspector. A local building or health official confirming the condition is one of the ways the law recognises, and it turns an argument into a document. Before any of the tenant remedies apply you also have to be current on rent, give the landlord proper notice, and allow a reasonable time for the repair.
Source: Texas State Law Library — Landlord/Tenant Law: Failure to Repair · retrieved 2026-10-15
What the city will and will not do in San Antonio
San Antonio is the one city of the four where complaints accumulate into a consequence. Under the Proactive Apartment Inspections program, a complex that collects three designated citations within a rolling six-month period is placed on a public registry, and the city maintains a dashboard of inspections, violations and citations issued.
The practical reading is that a complaint which becomes a citation counts for the next tenant as well as for you, and one never filed counts for nobody. Code issues go through 3-1-1 or 210-207-6000.
Source: City of San Antonio Development Services — Proactive Apartment Inspections · retrieved 2026-10-15
Licensing in Texas
Texas is one of the few states that licenses this work directly. TDLR requires a licence for mold-related activities, with an exemption for projects smaller than 25 contiguous square feet, and it does not allow one company to carry out both the assessment and the remediation on the same project. Asking for a licence number here is not awkward, it is how the system is meant to work.
Source: TDLR — Mold Assessors and Remediators at a Glance · retrieved 2026-10-14
What is different about San Antonio
San Antonio is the driest of the four Texas metros on our list: 32.27 inches a year across 46 days, at an average 69.5°F — the second warmest in our set after Phoenix. Rain arrives less often here, and when it does the warmth means the envelope dries slowly afterwards.
Warm and intermittently wet is a combination that hides problems rather than preventing them. A leak that would announce itself in a cold climate by staining and swelling can sit here for a season without visible change.
Where to look first here: bathrooms and the walls behind them. Warm air and infrequent rain mean a slow internal leak can run for a season without a stain appearing anywhere you would notice.
Around 44% of homes predate 1980. Combined with slow drying, an older supply line here can weep for a long time before anything appears on a surface.
Mold in San Antonio: what matters locally
32.27"
Average yearly precipitation
How much water the building envelope has to shed in a year.
Source: NOAA NCEI, 1991–2020 US Climate Normals · SAN ANTONIO INTL AP · retrieved 2026-10-14
46.3
Days a year with 0.1" of rain or more
How often the envelope gets wet matters more than the yearly total: materials that never dry out are the ones that grow.
Source: NOAA NCEI, 1991–2020 US Climate Normals · SAN ANTONIO INTL AP · retrieved 2026-10-14
69.5°F
Average yearly temperature
Warm air holds more moisture, so the same rainfall behaves differently in a warm climate and a cold one.
Source: NOAA NCEI, 1991–2020 US Climate Normals · SAN ANTONIO INTL AP · retrieved 2026-10-14
62.7%
Average relative humidity
Indoor humidity follows outdoor humidity wherever air is not conditioned — a crawl space, an attic, a closed-up room. It matters more than rainfall for whether surfaces dry.
Source: NOAA NCEI, Local Climatological Data, daily averages 2022–2024 · SAN ANTONIO INTL AP · retrieved 2026-10-15
43.7%
Homes built before 1980
Of 603,213 housing units. Older envelopes mean fewer vapour barriers, more plumbing history, and more places water has already been.
Source: U.S. Census Bureau, ACS 5-year 2019–2023, table B25034 · retrieved 2026-10-15
How the work is usually done
- Step 1
Assessment
A walkthrough to find the moisture source and the extent of the growth. Moisture meters and, where needed, sampling.
- Step 2
Containment
The work area is isolated with sheeting and negative air pressure so that demolition does not move spores through the rest of the house.
- Step 3
Removal
Porous materials that cannot be cleaned — drywall, insulation, carpet pad — come out. Framing and hard surfaces are cleaned in place.
- Step 4
Cleaning and drying
HEPA vacuuming and wiping of surfaces, then dehumidifiers and air movers until materials are back to normal moisture content.
- Step 5
Clearance check
A final look, and on larger jobs post-remediation verification, often by a third party rather than the contractor who did the work.
Scope and sequence are set by the provider after they see the property. Steps may be combined on a small job.
Questions about mold in San Antonio
It is dry here most of the year. Why is there mold?
Because the source is usually inside: a slow leak, a failed seal, condensation on a cold surface. The climate decides how fast things dry, not whether water gets in.
Does the state license this?
Texas does, through TDLR, for projects of 25 contiguous square feet and above.
Can one company do both the test and the work?
Not in Texas. The assessment and the remediation must be done by separate companies.
How large does an area have to be before I call someone?
EPA puts the line for do-it-yourself cleanup at less than about 10 square feet. Texas sets its licensing threshold at 25 contiguous square feet, which is a different question — one is about method, the other about who may be paid to do it.
Sources and standards
- EPA — Mold — General federal information on mold and moisture.
- EPA — A Brief Guide to Mold, Moisture and Your Home — Where the 10-square-foot rule of thumb for calling a professional comes from.
- EPA — Mold Cleanup in Your Home — What cleanup involves and when it stops being a DIY job.