This study was conducted to determine and compare indoor mold concentrations of total mold, five target taxa, and unidentified mold taxa using culturable/viable mold sampling (on DG-18 and MEA) and total mold spore sampling concurrently. Samples were taken within two locations of 22 single-family dwellings. Paired comparisons of culturable/viable mold concentrations revealed that DG- 18 samples had significantly higher total colony counts than MEA samples and near significantly higher counts of Aspergillus. Total mold spore concentrations were an average of 16-21 times greater than culturable/viable mold concentrations. The use of both sampling techniques concurrently allowed apparent viability ratios to be calculated. Significant differences in apparent viability were observed on the two media for total mold and Cladosporium, and near significance for Aspergillus; higher ratios were observed using DG-18. These studies indicate that DG-18 may be a superior medium for culturable/viable mold sampling and significant apparent viability differences exist among mold taxa quantified. / Department of Natural Resources and Environmental Management