Captain Quentin Leroy told France 24 the canals are popular meeting spots for young people who want to cool off from the summer heat.
"They drink too much and think it's a good idea to jump in the water without being aware of the danger," Leroy said. "We're dealing with incidents that happen mostly late at night and with people who are intoxicated."
Leroy said water in the canals can be up to 16 feet deep and if a person goes under, a rescue can be extremely difficult.
The three deaths occurred at the Canal St. Martin in Paris' 10th arrondissement and in the Canal de l'Ourc that comes into the city from the north.