Rockville Vehicle Emissions Testing Station

Shop type

Inspection & Smog Stations

Address

15910 Chieftain Ave, Derwood, MD

Phone

(410) 768-7000

Opening hours

• Tue, Wed 07:00-19:00
• Mon, Thu, Fri 08:30-17:00
• Sat 07:00-13:00

As mapped; call before you go.

Data checked

November 6, 2026 (OpenStreetMap)

Location

Map © OpenStreetMap contributors. Confirm the address before you drive over.

Before You Hire

Typical turnaround is same day, often under 30 minutes. Ask:

• What is the inspection fee, and does it include a retest?
• Do I need an appointment?
• What documents do I need to bring?
• If it fails, must I repair it here?

All 4 questions to ask →

Tips

• Rules and fees are set by your state, and many states require none: check your DMV.
• You can generally take a failed vehicle to any repair shop you choose.

Getting several quotes? Line them up in the quote comparison tool and read what to check on an estimate before you approve work.