In most cases, if visible mold growth is present, sampling is unnecessary. Since no EPA or other federal limits have been set for mold or mold spores, sampling cannot be used to check a building's compliance with federal mold standards. Surface sampling may be useful to determine if an area has been adequately cleaned or remediated. Sampling for mold should be conducted by professionals who have specific experience in designing mold sampling protocols, sampling methods, and interpreting results. Sample analysis should follow analytical methods recommended by the American Industrial Hygiene Association (AIHA), the American Conference of Governmental Industrial Hygienists (ACGIH), or other professional organizations.
Investigating hidden mold problems may be difficult and will require caution when the investigation involves disturbing potential sites of mold growth. For example, removal of wallpaper can lead to a massive release of spores if there is mold growing on the underside of the paper. If you believe that you may have a hidden mold problem, consider hiring an experienced professional.
For more information, see:
- Hidden Mold - www.epa.gov/mold/brief-guide-mold-moisture-and-your-home
- A Brief Guide to Mold, Moisture, and Your Home - www.epa.gov/mold/brief-guide-mold-moisture-and-your-home [EPA 402-K-02-003]
- Una Breve Guía para el Moho, la Humedad y su Hogar está disponible en el formato PDF - https://espanol.epa.gov/cai/una-breve-guia-para-el-moho-la-humedad-y-su-hogar. Documento de la agencia EPA número 402-K-03-008.
- Mold Remediation in Schools and Commercial Buildings - www.epa.gov/mold/mold-remediation-schools-and-commercial-buildings-guide [EPA 402-K-01-001, March 2001]
Visit our website at www.epa.gov/mold.