Price
Call for price
Hours
Open Tue–Sat
Station type
Test Only
Appointments
Walk-ins welcome
Hours
- Monday
- Closed
- Tuesday
- 9 AM – 5:30 PM
- Wednesday
- 9 AM – 5:30 PM
- Thursday
- 9 AM – 5:30 PM
- Friday
- 9 AM – 5:30 PM
- Saturday
- 9 AM – 5 PM
- Sunday
- Closed
Good to know
Languages
English
Payment
Credit Card, Debit Card, NFC/Contactless
What to expect at Horizon Smog
Horizon Smog is licensed by the Bureau of Automotive Repair as a Test Only smog station in Brentwood. It runs the inspection and issues the certificate but does no repairs. It is STAR certified, so it can test vehicles the DMV directs to a STAR station, including gross polluters.
Walk-ins are welcome. Most smog checks take 15 to 30 minutes, and most visits are closer to 20.
What to bring
Your registration or DMV renewal notice
It says whether the car needs a STAR station.
The car, with the check engine light off
On a 2000-or-newer car, a lit check engine light fails the test on its own.
A way to pay
The $8.25 state certificate is paid on top of the test when the car passes, unless the station's price or coupon includes it.
What if I fail?
- Horizon Smog doesn't do repairs, so the car goes to a repair shop and comes back for the retest.
- Each station sets its own retest price, so ask before the first test.
- BAR's Consumer Assistance Program pays up to $1,450 toward emissions repairs for income-eligible owners.
205 Oak Street, Brentwood, CA 94513
Get directions →Hours
- Monday
- Closed
- Tuesday
- 9 AM – 5:30 PM
- Wednesday
- 9 AM – 5:30 PM
- Thursday
- 9 AM – 5:30 PM
- Friday
- 9 AM – 5:30 PM
- Saturday
- 9 AM – 5 PM
- Sunday
- Closed
Also listed on
Other stations near Horizon Smog
Brentwood Muffler & Auto Repair
8362 Brentwood Blvd
A-1 Stop Smog Brentwood
8285 Brentwood Blvd
Jimmys Smog
8157 Brentwood Blvd Ste d
Brentwood Smog Express
8040 Brentwood Blvd Suite C
Bill Brandt Ford
8100 Brentwood Blvd
Nearby cities in Contra Costa County
Questions about Horizon Smog
Horizon Smog is open Tuesday 9 AM to 5:30 PM; Wednesday 9 AM to 5:30 PM; Thursday 9 AM to 5:30 PM; Friday 9 AM to 5:30 PM; Saturday 9 AM to 5 PM. Closed Monday and Sunday. Hours can change on holidays, so call ahead if you are cutting it close.
Horizon Smog accepts Credit Card, Debit Card, NFC/Contactless.
Google lists the following accessibility features at Horizon Smog: wheelchair accessible entrance, wheelchair accessible parking.
Horizon Smog has held a BAR smog license since 2017. You can verify the license status at bar.ca.gov.
Horizon Smog has not published a price on SmogCheckDeals. The Bureau of Automotive Repair puts the statewide average at $69.16 as of August 2026, about $65 for a 2000-or-newer vehicle and $73 for 1999-or-older, plus the $8.25 certificate fee. Call (925) 308-7600 for a quote.
Horizon Smog does not take online bookings here, but walk-ins are welcome. Call (925) 308-7600 to check the wait.
Staff at Horizon Smog speak English.
The closest alternatives in Brentwood are Brentwood Muffler & Auto Repair (0.2 mi) and A-1 Stop Smog Brentwood (0.2 mi). Both are listed further up this page with their ratings and hours.
How we get this data: BAR licenses and STAR status, Google hours and ratings, coupons published by the station.
Verify this station’s license and STAR standing at bar.ca.gov.
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BAR field office: Hercules • Licensed since 2017