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24 companies listed · 12 in Charleston · 7 open 24/7 · 17 open weekends · 22 rated 4.5+
Data verified October 18, 2026
Listed for homeowners in and around Charleston, SC, these 24 companies test for mold and indoor air problems. Listings show what each one states about sampling, lab work and the environmental tests it offers, plus ratings and quotes from public reviews.
12 of the 24 companies we list are based in Charleston; the other 12 serve Charleston from towns including North Charleston (9 mi), Daniel Island (4 mi) and Johns Island (9 mi). The companies on this page are rated from 4.3 to 5.0 across 3,162 reviews; 13 have 50 or more reviews and 22 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (89%), responsiveness (83%) and quality (81%). 7 are open around the clock; 17 are open on Saturdays and 11 on Sundays. The services the companies on this page list most often on their websites are mold remediation (5), air duct cleaning (3), mold inspection (3), mold removal (3) and air quality testing (2). 4 show a license on their websites; 4 list staff certifications (ASHI, EPA and IICRC) and 4 have a BBB rating of A or A+. Domain records put 13 websites of the companies on this page at ten or more years old; the oldest dates from 1996. We count these figures across the companies on this page; distances are straight-line, and hours and prices change, so confirm the details with the company before you book.
A free estimate is advertised by 9 of the 24 companies listed for Charleston. Read what free covers. A free visit from a firm that sells removal is a sales call; a free visit that ends with lab work quoted separately is closer to honest. Independent testing is rarely free, and that is the point.
