The Washington DC emissions testing hours for the Inspection Station (located at 1001 Half Street, SW) are Tuesday – Saturday from 7:00 a.m. until 3:00 p.m.  If you have questions you can reach the station at 202-737-4404.

The times when the station is the least busy are on Wednesday, Thursday, or Friday between the hours of 8:30 a.m. – 10:00 a.m. or from 1:30 p.m. – 3:00 p.m.

You can schedule your vehicle emissions testing ahead of time online by visiting the scheduling center here.

The days that come before or after a holiday are usually busy at the inspection station and Saturdays are usually always busy.

Please note that cash is not an accepted form of payment, you can pay with a Visa or Mastercard debit or credit card, Money Order, Check, or Discover credit card.