San Marcos, TX
Avoid Health risks with Certified Mold Inspection in San Marcos, TX
In a city like San Marcos—where the San Marcos River brings humidity and heavy rains are common—hidden mold is a problem we’ve seen all too often. From older homes near Texas State University to riverfront properties along Aquarena Springs Drive, moisture builds up fast, and mold follows soon after. If you’ve noticed musty smells, water spots, or allergy-like symptoms at home, there’s a good chance mold could be the culprit.
At LoneStar Mold Testing, we’ve been serving Texas communities for nearly three decades. We don’t just test; we teach, guide, and provide solutions that make sense for your home. Whether you’re in a family neighborhood near Wonder World Drive or a student rental close to campus, we tailor each inspection to your environment.
Our team uses advanced diagnostics—including K9 detection—to find mold that’s hiding behind walls or under floors. Let’s get to the root of the issue before it becomes a bigger one.
Your First Line of Defense Against Indoor Air Hazards
We understand the unique challenges San Marcos homeowners face when it comes to mold and air quality. Seasonal flooding, high humidity, and aging infrastructure can all increase risk. At LoneStar Mold Testing, our mission is to give you answers—not guesswork—through science-backed testing and clear, honest communication every step of the way.
Our residential testing services include:
- Mold Testing: We collect samples and analyze them in certified labs for accurate mold identification.
- Air Quality Testing: Uncover hidden irritants and toxins affecting your indoor environment.
- Radon Testing Services: Ensure your home is safe from long-term radon gas exposure.
- Mold Remediation: We isolate and eliminate mold at the source to restore healthy conditions.
- K9 Mold Inspections: Specially trained dogs sniff out mold in tight, hidden spaces no tool can reach.
Keep Mold Out With These Pro Tips
San Marcos offers natural beauty and a strong community vibe, but it also comes with mold risks, especially in neighborhoods near the Blanco River or homes without modern ventilation. Fortunately, a few smart steps can keep mold from getting the upper hand.
Here’s how to protect your home:
- Ventilate high-moisture areas: Use exhaust fans in kitchens, bathrooms, and laundry rooms.
- Inspect after storms: Check basements, attics, and siding for water leaks or signs of dampness.
- Use a hygrometer: Monitor your indoor humidity and keep it below 50% year-round.
- Clean and dry promptly: Wet materials should be dried or removed within 24–48 hours.
At LoneStar Mold Testing, we’ve helped families across San Marcos, TX make their homes safer and healthier for over 28 years. Whether you’re prepping for a sale, just moved in, or simply want a clear picture of your indoor air, call us at (713) 875-2889 to schedule your mold inspection today.
What Our Clients Are Saying
- Test for Toxic Materials & Mold It gave me peace of mind after we had some water damage from a storm and there was a delay in getting my new roof. Gratefully the air quality was very good. The technician even offered to change my air filter on my HVAC. How kind! He was on time and followed up promptly.read moreread lessIt gave me peace of mind after we had some water damage from a storm and there was a delay in getting my new roof. Gratefully the air quality was very good. The technician even offered to change my air filter on my HVAC. How kind! He was on time and followed up promptly.read moreread less
- I'm so glad I contacted Lance at LoneStar Mold Testing. Like so many people, This was the first time I've had to look for and subsequently hire someone to test for mold. In the process of refinancing my house, the appraiser for the mortgage company thought that there might be mold in the walls. I tried explaining that what they were seeing was a discoloration where my wife had tried to remove old wallpaper as she had gouged the sheetrock that left a rough patch that DID look awful... but, "it wasn't mold," I explained. The mortgage company had already made up its "mind" and wanted a mold test done.
I contacted 3 companies as is standard practice when looking for bids. Lance of LoneStar called me almost immediately after I'd posted a request for bids on HomeAdvisor. The other two waited until the next day to call or respond. Lance's message seemed sincere and that he'd answer any questions I might have. While the other two encouraged me to call them back for a bid, Lance's message was more reassuring. In the end, I chose LoneStar.
Lance DID answer my questions. all of them. I had several and he patiently answered them. He told me exactly what he was going to do as required by standard practices and well as the law. (As he said, "It's nothing personal. It's because I have my license on the line.") We set up a time for the inspection.
He was on time and professional - and friendly. I ushered him in and we engaged in a little small talk. I showed him the spot on the wall that drew the attention of the appraiser. He just shook his head and with a small smile of self-assurance said, "This'll only take a few minutes."
Indeed it took only a few minutes to get his samples.
The cost was reasonable and, like many self-employed pros, he preferred cash and gave me a small discount because he didn't have to pay the credit card fee.
Our appointment was about noon so I presumed that I'd get the results in a day or two because it was already getting late in the day and he'd told me that he had another one or two appointments later in the day. I was happily surprised that I received the results by about 7 o'clock that evening! I was able to file the pdf report with the mortgage company that same day which allowed me to close a day earlier!
If I need a mold inspector again, I'll call LoneStar Mold Testing with Lance. As he left my house he commented, "I hope I don't have to see you again . . . not because I don't like you or wouldn't want to come back over. I just hope you don't have a mold issue to deal with."read moreread lessTest for Toxic Materials & Mold I'm so glad I contacted Lance at LoneStar Mold Testing. Like so many people, This was the first time I've had to look for and subsequently hire someone to test for mold. In the process of refinancing my house, the appraiser for the mortgage company thought that there might be mold in the walls. I tried explaining that what they were seeing was a discoloration where my wife had tried to remove old wallpaper as she had gouged the sheetrock that left a rough patch that DID look awful... but, "it wasn't mold," I explained. The mortgage company had already made up its "mind" and wanted a mold test done. I contacted 3 companies as is standard practice when looking for bids. Lance of LoneStar called me almost immediately after I'd posted a request for bids on HomeAdvisor. The other two waited until the next day to call or respond. Lance's message seemed sincere and that he'd answer any questions I might have. While the other two encouraged me to call them back for a bid, Lance's message was more reassuring. In the end, I chose LoneStar. Lance DID answer my questions. all of them. I had several and he patiently answered them. He told me exactly what he was going to do as required by standard practices and well as the law. (As he said, "It's nothing personal. It's because I have my license on the line.") We set up a time for the inspection. He was on time and professional - and friendly. I ushered him in and we engaged in a little small talk. I showed him the spot on the wall that drew the attention of the appraiser. He just shook his head and with a small smile of self-assurance said, "This'll only take a few minutes." Indeed it took only a few minutes to get his samples. The cost was reasonable and, like many self-employed pros, he preferred cash and gave me a small discount because he didn't have to pay the credit card fee. Our appointment was about noon so I presumed that I'd get the results in a day or two because it was already getting late in the day and he'd told me that he had another one or two appointments later in the day. I was happily surprised that I received the results by about 7 o'clock that evening! I was able to file the pdf report with the mortgage company that same day which allowed me to close a day earlier! If I need a mold inspector again, I'll call LoneStar Mold Testing with Lance. As he left my house he commented, "I hope I don't have to see you again . . . not because I don't like you or wouldn't want to come back over. I just hope you don't have a mold issue to deal with."read moreread less - Test for Toxic Materials & Mold Lance returned my call in a matter of a few minutes asked him when he can come he said I can now. Lance was awesome. He told me how he was going to set up and then answered all my questions. Even took zelle as payment. And sent reports asap. Thanks again Lanceread moreread less
Lynn G.10/07/2021Lance arrived on schedule and explained the process. He was very pleasant and knowledgeable. I highly recommend him.read moreread less - Test for Toxic Materials & Mold Lance was very nice and professional and even gave me some good tips about making sure my home remained in great shape for future inspections. He has been in the business many years and pointed out one small thing I never would have thought about. Price was higher than regular home inspection but that is because of the tests they have to do on the air quality of the home.read moreread lessLance was very nice and professional and even gave me some good tips about making sure my home remained in great shape for future inspections. He has been in the business many years and pointed out one small thing I never would have thought about. Price was higher than regular home inspection but that is because of the tests they have to do on the air quality of the home.read moreread less
Diane C.9/13/2021Lance was very nice and professional and even gave me some good tips about making sure my home remained in great shape for future inspections. He has been in the business many years and pointed out one small thing I never would have thought about. Price was higher than regular home inspection but that is because of the tests they have to do on the air quality of the home.read moreread less
Lula L.9/09/2021They are very prompt and professional. Absolutely would recommend. They're a little pricey but customer service is outstanding.read moreread less
Misty T.9/08/2021Very fast response, appointment set next day, they gave an exact time that they would be at my home and were on time for my scheduled time and very professional!read moreread less
Peter G.8/12/2021Looked out for the customer. Told me what I needed and didnâ t need. Will use him in the futureread moreread less
T.s. B.8/09/2021Worked me into his schedule which caused him to have to work longer hours than usual which I thought was incredibly kind. He didn't have to do that. A gentleman and expert.read moreread less

