Firefighters and paramedics were called to the canal in Wigan to reports a woman had fallen in the water.
Two fire engines, an ambulance and a rapid response vehicle went to the Leeds-Liverpool Canal, next to Wigan Investment Centre on Waterside Drive, at 8.50am on Thursday.
Other news: More security after racecourse brawl
A fire service spokesman said: "We were called at 8.50am to reports of a lady in the water. When we got there, she was already out of the water."
A spokesman for the ambulance service said paramedics checked the woman but did not take her to hospital.