MOLD Testing


Mold can be found in virtually every home and business in the United States. Consequently, when conducting a formal mold assessment, it is anticipated that some level of mold presence will be detected. However, there is an important distinction between the typical existence of mold particles indoors and the abnormal accumulations and indoor growth. Normal mold levels found indoors are what is referred to as the “indoor fungal ecology.” However, when mold concentrations exceed acceptable thresholds, unchecked mold growth poses a potential serious health risk and can damages whatever it grows on.

The presence of visible mold growth or the detection of mold odors signifies a potential issue that demands immediate attention. Elevated levels of mold in your home can pose significant health risks to your family. Some mold spores are recognized carcinogens, while others can contribute to respiratory ailments, allergies, and various health concerns. Furthermore, mold can compromise the structural integrity and construction of your home so it is important to address such concerns promptly.

woman looking on microscope inside room

Mold inspection and testing services are recommended when individuals suspect possible health risks or hazards to occupants in an indoor environment. NTX Enviro will perform a visual inspection for visible mold growth, areas with elevated moisture content, as well as areas with indications of past moisture intrusion. Any samples taken are sent to an independent laboratory for analysis. Laboratory results are typically available within 24-48 hours, at which time we will provide a report with photos, lab results, and recommendations.


There are specific limitations for each of the available mold testing procedures. A licensed Mold Assessment Consultant (MAC) is aware of these limitations and will not rely on certain aspects of testing when some of the results can be interpreted in more than one fashion. Unfortunately, there are many mold inspection companies out there that will claim to be mold professionals but lack the proper certifications and training to be able to properly implement and analyze indoor air analysis. Always be sure that the person performing the testing is a state licensed Mold Assessment Consultant (MAC). Microbial samples collected by NTX Enviro are submitted under chain of custody for direct analysis to an independent, third-party accredited American Industrial Hygiene Association and Texas Department of Licensing and Regulation licensed laboratory for microscopic analysis.

There are various sampling methods used by
NTX Enviro depending on the requirements:

person in white long sleeve shirt holding blue ceramic plate with brown soup

Air Sample

Air sampling is designed to count and identify the presence of total fungal material in a measured volume of air. These samples are taken by using a pump that forces air through a spore-trap cassette to collect mold spores for analysis via a microscopic screen. Culture plates are used for analysis of culturable fungi or bacteria and are collected with an N-6 impactor.

Wall/Ceiling Cavity Sample

Samples are collected by drilling a small access hole into the surface of the area to be sampled and inserting a plastic tube into the hole through which an air sample is pulled. These samples are collected on a spore-trap cassette and analyzed microscopically. Wall/Ceiling Cavity samples are typically collected at locations associated with known plumbing leaks, roof leaks, or any other source of water intrusion.

Dust Sample

Dust samples are samples of the dust material located within carpets or other porous materials. These samples are analyzed via a microscopic screen, viable fungi culture, or viable bacteria culture. The viable culture data is reported in colony-forming units per gram (CFU/g) of dust. Bulk dust samples are collected to determine the average microbial loading within a fabric material.

Surface Sample

Surface samples are collected on sterile cotton swabs and immediately sealed and labeled. These samples can be collected over a predetermined surface area or as a composite sample from various points on a contaminated surface. Surface samples are collected at locations exhibiting visible water staining or microbial growth and are taken for the purposes of identification utilizing a microscopic screen, viable fungi culture, or viable bacteria culture. Tape samples are another form of surface sample collected from a specific location exhibiting microbial contamination.

Bulk Sample

Bulk samples are typically a 2” x 2” piece of material having visible microbial growth or a suspect area on. Bulk samples are cut from its surroundings and placed in a sealed container before submitting to the laboratory via a chain of custody for analysis.