Popular Cities
1 of these companies is based in Severn; the others serve Severn from towns including Baltimore (13 mi), Glen Burnie (5 mi) and Linthicum Heights (6 mi).
7 open 24/7 · 21 open weekends · 22 rated 4.5+ · 8 show a license
Data verified October 21, 2026
Listed for homeowners in and around Severn, MD, 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.
The 24 companies on this page are rated from 4.4 to 5.0 across 4,354 reviews; 23 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 (94%), quality (86%) and responsiveness (84%). The topics that come up most in reviews of the companies on this page are "price", "estimates" and "knowledge". 7 are open around the clock; 20 are open on Saturdays and 15 on Sundays. The services the companies on this page list most often on their websites are mold remediation (6), basement waterproofing (4), home inspections (3), water damage restoration (3) and carpet cleaning (2). 8 show a license on their websites; 4 list staff certifications (IICRC and InterNACHI) and 9 have a BBB rating of A or A+. 14 have ten or more years of experience, the longest 39 years. 9 offer emergency call-outs; 3 offer financing or payment plans; 12 give free estimates; 5 are family- or locally-owned and 5 list coupons or special offers. 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.
Sites are listed for all 24 companies here. Check whether the company sells removal as well as testing, which lab it sends samples to, and whether it shows a redacted sample report. A firm that explains its sampling method in public is easier to hold to it later.
