Maryland Department of the Environment — Radiological Health / Radon Safety
Maryland radon (air)
No public state certified-business roster to republish. Updated 2026-09-19 (US/Pacific).
If you are not sure you need a pro yet, see when a DIY radon test kit is enough or how to test a home for radon.
Maryland does not publish a current downloadable statewide certified-business roster of radon measurement or mitigation companies that this index can copy. The Maryland Department of the Environment (MDE) Radon Safety page links “Find a Certified Radon Service Provider” to NRSB and NRPP only. The Maryland Department of Health (MDH) radon page likewise points consumers to those national programs for certified professionals and kits.
This page does not invent company names, phones, licenses, or addresses. It does not scrape NRPP, NRSB, certifiedradonpros, or other third-party directories into a fake “state roster.”
Prefer NRPP- or NRSB-certified measurement and mitigation professionals, then re-check the credential on the national site before hiring.
What homeowners can do
- Radon is an invisible, odorless radioactive gas from soil and rock. You cannot see or smell it — testing indoor air is the only way to know a building’s level. This page covers indoor air, not well water.
- EPA’s action level remains 4 pCi/L. Mitigate if confirmed indoor-air results are at or above that level.
- Test kits are available at hardware stores and online. MDH also notes you can find kits and measurement/mitigation professionals through the national programs linked from its radon page.
- Prefer NRPP- or NRSB-certified measurement and mitigation pros; re-check the credential before hiring.
- MDE publishes an interactive radon map of Maryland for context only — it is not a substitute for testing your own home.
- Questions: Environmental Health Hotline / Nancy Servatius 866-703-3266 (listed on the MDE Radon Safety page; MDH also references the same 1-866-703-3266 hotline on its radon page).
- Optional secondary national lookups: NRPP Find a Pro or NRSB Find a Pro.
Official sources
- Maryland Department of the Environment — Radon Safety (retrieved 2026-09-19; primary; NRSB/NRPP find-a-provider links; interactive Maryland radon map; Environmental Health Hotline 866-703-3266)
- Maryland Department of Health — Radon (retrieved 2026-09-19; points to NRSB and NRPP; EPA 4 pCi/L guidance; hotline 1-866-703-3266)
- NRPP Find a Pro (retrieved 2026-09-19; linked from MDE and MDH)
- NRSB Find a Pro (retrieved 2026-09-19; linked from MDE and MDH)
- U.S. EPA Radon (retrieved 2026-09-19)
This index does not rank contractors or take referral fees. No Amazon kit links on this state page.