Peel police say the suspected drowning of a 21-year-old woman in Mississauga on Saturday night is being treated as suspicious.

Mississauga firefighters pulled the woman without vital signs from the water off J.J. Plaus Park, near Lakeshore Road West and Hurontario Street. Emergency crews were called to the area, at the mouth of the Credit River, at about 10:50 p.m.

A man called police about the woman in the water and he has been interviewed by police, according to Const. Akhil Mooken, spokesperson for Peel Regional Police. The man has not been arrested.

"I don't know if she was with somebody when she went in. What I do know is that the individual that contacted emergency services did know the victim," Mooken said on Sunday.

When police and firefighters arrived, they found the woman in the water, he said. The area is in Mississauga's Port Credit neighbourhood.

It took firefighters 45 minutes to locate her, Mooken added. Firefighters used to a fire department boat to pull her to shore and he could not say how far she was from shore when found.

The woman was taken to hospital. She was pronounced dead there.

A bag with clothing and shoes was found near the scene. (Jeremy Cohn/CBC)

Mooken said her death will be considered suspicious unless police can prove it was an accident or suicide.

Police are currently trying to determine how the woman ended up in the water and the exact circumstances surrounding her death.

Next of kin will be notified. Her name has not been released.

The pier in the area was taped off as officers searched for evidence on Saturday night and Sunday morning.

"We are investigating all avenues at this time," he said.

Mooken said police are trying to determine what the relationship is, if any, between the caller and victim.

Anyone who witnessed anything in the area at the time is urged to call police.

Peel police have taped off the area near where the woman was found in the water. (Jeremy Cohn/CBC)