What Is ERMI? The Environmental Relative Moldiness index (ERMI) was developed by the U.S. Environmental Protection Agency, Office of Research and Development (ORD) as a research tool to investigate mold contamination in homes. The methodology is based on using mold-specific quantitative polymerase chain reaction (MSQPCR) to quantify 36 molds and calculate an index number for comparison with a database of reference homes. Disclaimer: The EPA has not endorsed or validated any tools or methods to determine mold burden in homes including MSQPCR and ERMI. However, the transfer of this technology under the Federal Technology Transfer Act cannot be used to make any claims suggesting that the ERMI is an EPA-approved or validated test. (Source: EPA, Office of Inspector General: Public May Be Making Indoor Mold Cleanup Decisions Based on EPA Tool Developed Only for Research Applications).
HOW DOES IT WORK?
The ERMI test involves the analysis of a single sample of dust from a home. The sample is analyzed using mold-specific quantitative polymerase chain reaction (MSQPCR), a highly specific DNA-based method for quantifying mold species. A simple algorithm is used to calculate a ratio of water damage-related species to common indoor molds and the resulting score is called the Environmental Relative Moldiness Index or ERMI. The ERMI value is typically between -10 and 20.
Mold Investigation Thermal Imaging Mold Sampling/Testing Full Report Industry Recommendations