Three other members of the family were rescued by a team of the National Disaster Response Force (NDRF), which was holding a training session nearby.
The deceased were identified as Prashil Adhav (7), Anil Kolse (58) and Pritesh Agale (32).
"Kolse fell into the water while he walking near the dam. Some of the family members tried to save him, but fell into water," an officer said.
"Someone alerted the NDRF team, which was conducting a training nearby. While three were rescued, three others drowned. They were shifted to a hospital, which declared them brought dead," he said.
A case of accidental death was registered, police said.
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