In general, an indoor mold assessment professional should be consulted when assessing the extent of a moisture problem, indoor mold growth, and performing other related activities.
The following guidelines are applicable to non-licensed individuals performing mold assessment on areas potentially affected by less than ten square feet (10 ft.2) of indoor mold growth; unless exempt by § 3201, a non-licensed individual shall not perform mold assessment on ten square feet (10 ft.2) or more of indoor mold growth in an affected area.
Prior to taking any steps to clean, scrape, remove, paint over, or otherwise remediate any indoor mold growth, a visual inspection should be performed that assesses the following:
If assessment work might disturb indoor mold growth, personal protective equipment, like gloves and respiratory protection, should be worn.
If indoor mold growth or water-damaged materials are visually identified, remediation shall be conducted in accordance with the guidance document published by the Department.
If ten or more square feet (10 ft.2) of indoor mold growth in an affected area is visually identified, the property owner, unless if exempt by § 3201.4, shall hire an indoor mold assessment professional who is licensed pursuant to § 3202 to conduct an indoor mold assessment.
D.C. Mun. Regs. tit. 20, r. 20-3206