mold inspection and testing in san antonio, tx

CRS is San Antonio’s Premier IICRC Mold Inspection Company

A good mold inspection answers three questions a stain on the wall cannot: how much is there, what species is it, and where is the water coming from. Without those answers, remediation is guesswork, and guesswork either misses hidden growth or tears out more than necessary. The investigation is its own discipline, closer to forensics than to cleaning, and in Texas it is regulated as a separate licensed activity for good reason. If you are buying a home, settling an insurance claim, or simply chasing a musty smell you cannot locate, call CRS at 210-656-2112 to scope an inspection.

Tom and Yolanda run CRS with IICRC-certified technicians, and we are deliberate about the line Texas draws between assessment and remediation. On larger projects the state requires that the person diagnosing the problem be independent from the company profiting off the removal, which is one of the most homeowner-friendly rules in the country, and we structure our work to honor it.

The difference between an inspection and a test

People use the words interchangeably, but they are distinct. An inspection is the physical investigation: a trained assessor walks the property, reads the building, and uses instruments to find moisture and likely growth locations. Testing is the laboratory side: collecting samples and sending them to an accredited lab for analysis that identifies the mold genera and quantifies the spore load. A thorough job uses both. The inspection tells us where to look and what the building is doing, and the testing confirms what is actually present and at what concentration. Skipping the inspection and going straight to a test from a hardware-store kit is how homeowners end up with a meaningless number and no idea where the problem lives.

How we investigate a San Antonio property

The instruments do most of the early talking. We start with a moisture meter, both pin and pinless, to map elevated moisture in walls, floors, and ceilings, because mold follows water and elevated readings point to the colonies hiding behind finishes. A thermo-hygrometer records the ambient temperature and relative humidity, and in our climate a reading consistently above 60 percent indoor relative humidity is itself a finding. We frequently use a thermal imaging camera, which does not see mold or moisture directly but reveals the temperature anomalies that betray water intrusion behind a wall, a cold wet patch on an exterior wall in Alamo Heights stucco, or a plume of cool air leaking around a window. Where a cavity is suspect, a borescope lets us look inside through a small hole before we recommend opening anything.

The building context matters as much as the readings. An inspector who knows San Antonio reads a 1950s pier-and-beam home in Monte Vista differently from a 2010 slab home in Cibolo. In the older home we check the crawlspace vapor conditions and the original galvanized plumbing; in the newer one we look hard at the HVAC condensate system and the wall behind the refrigerator. The spring storm season from March through June leaves its own signatures, and a roof or flashing leak that introduced water in April often presents as a defined moisture pattern by the time we inspect in summer.

What the lab testing actually tells you

When sampling is warranted, the method depends on the question. Air sampling, usually with a spore-trap cassette like an Air-O-Cell drawn by a calibrated pump, captures airborne spores so the lab can count and identify them, and the value comes from comparison: an indoor sample is read against an outdoor baseline taken the same day, because elevated indoor spore counts relative to outdoors is the meaningful signal, not a raw number on its own. Surface sampling, by tape lift or swab, confirms whether a visible stain is actually mold and which genus it is. Bulk sampling removes a piece of the material itself for analysis. Each method answers a different question, and a competent assessor chooses the sampling strategy to match what the inspection found rather than spraying samples around to pad an invoice.

For standards and definitions, we work to the ANSI/IICRC S520 framework, which classifies environments into Condition 1 (normal), Condition 2 (settled spores from a nearby source), and Condition 3 (actual growth). The IICRC maintains that standard, and the EPA publishes guidance on when sampling is and is not useful, which we share with clients who are deciding how far to take an investigation.

The Texas independence rule, and why it benefits you

Under the Texas Mold Assessment and Remediation Rules, a licensed Mold Assessment Consultant or Mold Assessment Technician performs the assessment and writes the remediation protocol, and on projects above the regulatory threshold that assessor cannot be financially tied to the remediation contractor doing the work. The logic is simple: the company that decides how big the problem is should not be the same company that gets paid more when the problem is bigger. After remediation, an independent assessor returns to perform clearance, and a qualifying job earns a Certificate of Mold Damage Remediation that insurers and future buyers may request. We help clients navigate that structure correctly so the paperwork holds up.

Where inspection and testing fit in

Testing is the front end and the back end of remediation. The findings shape any black mold removal protocol, post-remediation air quality testing verifies the work, and when the moisture source ties to water intrusion it overlaps our water damage restoration services. The full program lives under mold remediation.