Top Mold Testing Companies in San Antonio: Complete Guide

Top Mold Testing Companies in San Antonio: Complete Guide

Key Highlights

• Edwards Plateau limestone sheds water. It does not take in water. A strong storm can flood Salado and Leon creeks in just a few hours.

• On June 12, 2025, more than six inches of rain fell in one hour. Thirteen people lost their lives, and there were over 70 rescues. Some homes that did not get wet during the storm saw water come in after the streets filled up.

• Older homes in Alamo Heights and Mahncke Park do not have vapor barriers under their crawlspaces. Slab homes on the North Side often crack when they are close to creeks.

• SB 1255 (September 2025) says each on-site inspector has to have a TDLR license.

Flash floods are common in San Antonio. Rain falls on the limestone. The water moves downhill fast. Creeks fill up and can overflow before there is a warning. Some homes in the Northeast and Midtown are near Salado Creek. People on the West Side live by Leon Creek. On the North side, Olmos Creek can be a problem. When the water comes, it moves quickly. It can stay trapped in crawlspaces and walls for weeks after the flood.

It is not as humid here as it is in Houston or Corpus Christi. But when rain comes, the damage can still be as bad. Mold can start to grow in 24 to 48 hours. When you smell mold, it is already in the walls.

Flash Flood Mold: A Different Problem

Normal rain causes the water to rise slowly. Flash floods are not the same. The water in a creek comes fast. It can fill a home before anyone has time to get out. Then, the water can stay for days.

An inspection begins with a moisture meter. Mold grows inside HVAC air handlers. Crawlspaces in older homes that do not have vapor barriers can be a problem. Slab cracks that are close to creek areas are checked. Surface samples, air samples, and outdoor samples are taken. The lab finds out what kind of mold is there and counts the spores.

Your report must have moisture readings put on your floor plan. You need to add photos of every spot that was checked. The kind of mold should be named. It must show how many spores were found. A cleanup plan signed by a MAC has to be ready before any work begins.

Homes close to Salado Creek or Leon Creek need full checks for wet spots under the floor. A person who uses only a list to check things might not find the true issue. Water can stay hiding in spots that you can't see from where you stand.

Top Rated Mold Testing Companies in San Antonio

1. FastMoldTesting.com

Website: fastmoldtesting.com/san-antonio

Turnaround Time: ✅ You will get results in 1 to 2 business days.

Value for Money: 5/5 ⭐⭐⭐⭐⭐ (Very good)

Testing only. You can book the same day or next day. The service includes full moisture checks, air tests, and a cleanup plan.

He knows how San Antonio's creeks work and how flooding from limestone can hurt homes. When there is no money from cleanup, there is no problem.

✅ Benefits:

• You will get lab results and reports in 1 to 2 business days. This is one of the fastest times in Texas.

• We do testing only and do not give cleanup services. This means there is no conflict of interest.

• You can book for the same day or the next day in San Antonio.

• The service comes with a full moisture mapping, air samples, and a cleanup plan that is signed by a MAC.

• The team knows a lot about how limestone floods and creek zones work in the area.

❌ Disadvantages:

• Does not do mold cleanup (on purpose, to keep reporting fair)

🟢 Best for: People who just got water in the house, those dealing with real estate closings, renters who need to show what the place looks like, and anyone who wants quick answers without any problems.

2. Mold Inspection Sciences

Website: moldinspectiontexas.com 

Turnaround Time: Call to get an estimate 

Overall Rating: 5/5 ⭐⭐⭐⭐⭐

Every staff member has their own TDLR license. This includes the people who do checks, the helpers, and those who lead the projects. They do not use just one license for everyone. This is what makes this different. They are the ones who cover Bexar County and Hill Country. They do testing only. Their process is based on science. If you want, you can look up any license for the one who checks at tdlr.texas.gov before you book.

✅ Benefits:

• Each team member has their own TDLR MAC license, not just the supervisor.

• We work in Bexar County and Hill Country, and know the areas well.

• We do testing only and there is no clean-up mix up.

• You can check any team member’s license yourself at tdlr.texas.gov

❌ Disadvantages:

• The time it takes to finish the work is not shown to everyone. You have to call to get an estimate.

• There is less clear online pricing than what you find at flat-rate firms.

🟢 Best for: Homeowners who want to check every staff member's background on their own, and places where it is important that all team members have the right license.

3. Mold Inspection and Testing (MI&T)

Website: moldinspectionandtest.com/san-antonio-tx
Turnaround Time: 3 to 5 business days
Overall Rating: ⭐⭐⭐⭐⭐

Inspector Armando Flores has licenses for mold, asbestos, and lead. Many homes in San Antonio that were built before 1980 can have all three problems. So, he checks for them all during one visit. He sends samples to a lab outside. For every job, he checks from the attic down to the crawlspace and covers everything each time.

A multi-credential approach can help save both time and money in older San Antonio homes. In these houses, you often need more than just mold work.

✅ Benefits:

• The person with the right license can check for mold, asbestos, and lead. You get the three checks in just one visit.

• Every job gets a look from the attic down to the crawlspace. There are no shortcuts.

• We do testing only. We do not do cleanup, so there is no trouble there.

• The reports can work for insurance claims and if you end up with any legal issues.

❌ Disadvantages:

• You can get the work in 3 to 5 days. It is slower than San Antonio local competitors.

• This is a national firm, but it does not focus as much on the local creek zone.

🟢 Best for: Homes you buy to make money, houses with more than one problem built before 1980, and anyone who needs paperwork for insurance or to check things before making a choice.

4. DEKD Environmental

Website: 210dekdenterprises.com 

Turnaround Time: Call for estimate 

Overall Rating: 4/5 ⭐⭐⭐⭐

This San Antonio firm has REM (Registered Environmental Manager) and CIEC (Certified Indoor Environmentalist Consultant) credentials. These are more advanced than basic TDLR licensing. A TDLR MAC is also on the team. The team can cover a two-hour radius from San Antonio. In one visit, they can test for mold, asbestos, lead, and check indoor air quality. They only handle testing.

✅ Benefits:

• The REM and CIEC credentials show more skill than standard TDLR licenses.

• In one visit, they check for mold, asbestos, lead, and indoor air quality.

• They cover a two-hour area from San Antonio.

• They do testing only, so there is no mix-up with cleanup.

❌ Disadvantages:

• The turnaround time is not listed for the public. You will need to call to get an estimate.

• Premium credentials often cost more and you may have to pay higher prices.

🟢 Best for: Older homes in San Antonio. It is good for the places where several problems from the environment are found at the same time. It also works for insurance claims that need advanced expert proof.

5. Argus Environmental Consultants

Website: argusenvironmental.com

Since: Early 2000s

Turnaround Time: Call for estimate

Overall Rating: ⭐⭐⭐⭐

This is a San Antonio firm. There are two consultants and one technician in the team. A TDLR MAC firm license is on record.

They offer both cleanup and testing together. This can cause a problem. Texas law does not let the same company test and clean in the same job. If they test your house, you must pick a new company for cleanup. They get money when they find problems, and that is built into how they work.

✅ Benefits:

• This company has been working since the early 2000s. It has good local experience.

• It holds a TDLR MAC firm license.

• A small team here lets you be in touch with the senior consultants more easily.

❌ Disadvantages:

• The company does both the clean up and the testing. This can cause a problem because there is a direct conflict of interest.

• Texas law says that one company cannot check for mold and clean it up on the same job.

• There is a reason to say there is mold because the company earns money for clean up if it finds mold.

🟢 Best for: This is better if you need help with hard environmental consulting. Do not get them for easy home testing. You should go to a company that only does testing.

Choosing Your Inspector

First, make sure the license is real. tdlr.texas.gov/mld has a list of all active licenses. Look at the type, status, and if the license is still good before you pay.

Testing only. Companies that do cleanup work can make money by finding problems. Texas law says testing and cleanup must not be done by the same company. Do not hire someone who will face this kind of problem.

Creek zone expertise. Leon Creek, Salado Creek, and Olmos Creek act in their own way because of how water from limestone moves. Flooding here is not slow like in other places. Someone who knows these neighborhoods well can spot what a checklist might not see.

You need to have a written cleanup plan before the work starts. A licensed MAC has to sign this paper. If they cannot stand by this document, look for someone else.

Get the price upfront. After floods, there is more need for help, and prices with no clear answer get harder to fight. So, be sure you know the full cost before they come.

The Dual-License Trap

Texas law does not allow this. You cannot have the same firm do both jobs. A company cannot assess and then fix the issue too. These jobs must not happen at the same time or with the same people.

A company that gets paid for cleanup will want to find mold. This can make things unfair. If you spend your money on testing, you may not need to pay for cleanup. So, the company may not make as much money from the cleanup job.

Some companies will say they are "separate entities." The owner, address, and phone number are the same. There is no real difference. It's just for show. If you ask for both license numbers and they do not want to give them, you should leave.

Time and Money

On-site: 60 to 90 minutes. Lab turnaround: 1 to 5 days based on how fast you need it.

Your report must have moisture readings matched to the floor plan. You need to add photos of the spots you checked. Show what you found in the air. Compare spore counts to what's in the outdoor air. A MAC should sign a written cleanup plan. Without these steps, the report will not meet the Texas legal standards.

According to, Homeyou, in San Antonio, people pay for inspections in San Antonio. It can cost between $262 and $407 on average. Air checks are $75 to $150 for each test. Surface checks can be $50 to $100 for each one. A full inspection that takes many samples is $400 to $900. Testing after clean up will be $200 to $500.

Call right away when water gets in. Do not wait or put it off. A lot of people will want inspectors after floods. Testing early helps keep costs down and the job size small.

Reputation and Experience

Google and Yelp reviews can help you see if inspectors get booked fast and give clear reports. Look for things people say again and again. If there are 30 reviews using words like "professional" and "fast," that is what you can expect.

For homes in creek areas like Salado, Leon, or Olmos, talk to the inspector. Ask, "Have you worked on any homes here after a flood?" This is important. A person who knows about Salado Creek flooding will look at other places in your home. Someone using steps for the whole country may not do that.

Moving Forward

San Antonio floods quickly. June 2025 showed this to everyone. There was one afternoon of heavy rain. Many creeks went over their banks. Water got stuck in homes for weeks. The same thing will happen again.

When you see this, call an inspector that day. Do not wait. Do not put it off until later. Mold can spread fast. Testing early helps make the cleanup job smaller, keeps costs down, and gets the mold out quicker.

Get a licensed expert before a health problem comes up or before you sell.

Book San Antonio testing to get your test with us the same day or the next day. We just offer testing. There is no clean-up problem.

Frequently Asked Questions

Why does San Antonio flood so fast? The rock in the Edwards Plateau is made of limestone. This limestone does not soak up water. When it rains a lot, water goes right into Salado Creek, Leon Creek, and Olmos Creek. These creeks get high in just a few hours. Water can get into homes even before any warnings happen.

Do I have to tell about mold when selling? Yes. Texas Property Code Section 5.008 says you have to let people know about things that are wrong with the home. Mold is one of those things. If you do not tell, you can get in trouble with the law after the sale is finished. A home checkup before you sell that says your house is clean can help keep you safe.

What happened in the June 2025 floods?
More than six inches of rain fell in just one hour. Homes close to Salado and Leon creeks got water inside before any orders to leave were sent out. If homes were not fully dried out before being fixed, they kept wet spots. This hidden moisture stayed for months behind fresh drywall and new floors.

Should you test your crawlspace after a flood? Yes. The crawlspace is where water stays the longest and trouble starts the fastest. This is very true in old San Antonio homes without a vapor barrier. In these houses, wet air can move right from the crawlspace into your rooms. You should always check under your house after a flood. Do not skip this.

My home dried fast. Do I still need testing? Yes, you do. A dry surface does not mean the inside of walls is dry. In places with limestone flood zones, water can get in quick. That means walls can still be wet, even if floors feel dry now. A moisture meter can find water that you can not see with your eyes.

 

Key References

• Texas Occupations Code Chapter 1958 governs mold assessors and remediators

• TDLR Mold Assessors and Remediators Program maintains the license verification database

• City of San Antonio: June 2025 Flood Response

• Bexar Regional Watershed Management: Know Your Flood Risk

San Antonio Mold Inspection Cost Data from Homeyou 2026 project database