The Contra Costa Mosquito & Vector Control District is located at 155 Mason Circle, Concord, California. Our Business hours are 8 a.m. to 4:30 p.m. Monday through Friday.

From the west - (Richmond, Martinez): Hwy 4 East to Port Chicago Hwy North exit; left on Bates Avenue (2nd light); proceed 3/4 mile; left on Mason Circle.

From the east - (Brentwood, Antioch): Hwy 4 West to Port Chicago Hwy North exit; left on Bates Avenue; proceed 3/4 mile; left on Mason Circle.

From the south - (Danville, Lafayette): Hwy 680 North to Hwy 242 North; exit Port Chicago Hwy North; left on Bates Avenue (2nd light); proceed 3/4 mile; left on Mason Circle.