Gaithersburg Rental Radon Requirements

Section 13-21A applies to ground-contact or basement dwelling units in rental facilities containing at least four dwelling units. Confirm the ordinance’s definitions and your property’s facts before relying on a summary.

Before leasing a covered unit, the landlord must complete the required radon testing or use a certified radon professional as specified by the ordinance. A qualifying result must be from within two years before the lease date.

The City ordinance uses 4 pCi/L as the action level. It also provides tenant testing rights and requires landlords to provide the disclosures and testing information called for by the ordinance.

When a covered unit has a reportable elevated result, Chapter 13 includes 14-day notice, reporting, and follow-up provisions. The ordinance requires mitigation of confirmed elevated concentrations below 4 pCi/L within 90 days, along with professional final or post-mitigation results where required.

The ordinance also addresses disclosure and lease-termination protections for affected tenants. Review §13-21A directly and seek qualified legal or housing advice if a property-specific compliance or tenancy dispute is involved.