City of Rockville
Separate ordinances for sales and rentals
Two Separate Ordinances
The City of Rockville has passed two separate ordinances concerning radon legislation, with different effective dates for home sales and rental properties.
Requirements Summary
All Rockville radon law requirements for sales and rentals
Home Sales
Ordinance 12-22 • Effective Jan 1, 2023
- Single-family homes (including townhomes)
- Test within 1 year of settlement
- Disclosure to buyer required
- Follows Montgomery County standards
Rental Properties
Ordinance 06-23 • Effective Sep 27, 2023
- Single-family homes (attached and detached)
- Ground-contact and basement apartment units
- Test within 2 years of new lease
- Mitigation required if ≥4.0 pCi/L
- Stricter than county (2-year vs 3-year validity)
Key Difference
Rockville's rental ordinance requires more frequent testing with a 2-year validity period, making it stricter than Montgomery County's 3-year requirement.
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