Popular Cities
2 of these companies are based in Timonium; the others serve Timonium from towns including Baltimore (10 mi), Pikesville (8 mi) and Owings Mills (9 mi).
12 open 24/7 · 22 open weekends · 23 rated 4.5+ · 8 show a license
Data verified October 18, 2026
Listed for homeowners in and around Timonium, 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 7,830 reviews; 18 have 50 or more reviews and 23 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (94%), quality (83%) and responsiveness (80%). The topics that come up most in reviews of the companies on this page are "price", "communication" and "knowledge". 12 are open around the clock; 20 are open on Saturdays and 17 on Sundays. The services the companies on this page list most often on their websites are mold remediation (5), basement waterproofing (3), fire damage restoration (3), radon testing (3) and water damage restoration (3). 8 show a license on their websites; 4 list staff certifications (IICRC, HAAG and InterNACHI) and 5 have a BBB rating of A or A+. Domain records put 6 websites of the companies on this page at ten or more years old; the oldest dates from 2006. 12 offer emergency call-outs; 1 offers financing or payment plans; 9 give free estimates; 6 are family- or locally-owned and 3 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.
Not when the first visit ends with a large removal quote attached. You have 24 companies on this page, so getting a second diagnosis is straightforward. Ask each one what it thinks the water source is. Two independent answers that match is the strongest signal you will get.
