According to the U.S. Environmental Protection Agency (EPA), if visible mold is present on inspection, testing is usually unnecessary. There are no Environmental Protection Agency or government standards that have been established for mold or mold spore levels, so it is impossible to prove that a building or room is in compliance with any health regulations concerning mold exposure. Likewise, the CDC does not recommend routine sampling and testing of mold in the home. Tolerable or acceptable limits of mold exposure for humans have not been defined, and since individuals vary in their susceptibility to mold, testing cannot reliably predict the degree of health risks from any occurrence of mold.
When mold has previously been identified and cleanup procedures have been undertaken, sampling and testing may be carried out if necessary by qualified professionals to determine that adequate cleaning of a building has occurred.