Police say the worker — who was working on a water main along 9th Avenue — was sitting in the driver’s side of a van when he was shot just after 9 a.m on 49th Street.
The construction company the man works for believes the shooter is a former employee.
The victim was taken to Bellevue Hospital where he is expected to be treated and released.
Police are canvassing all stores in the area for surveillance footage that could possibly lead to the suspect.
The suspect is believed to be a man in his thirties with tattoos on both arms and wearing a black shirt. Police say he fled the scene in a white car.