Conn. Gen. Stat. § 7-312: Liability as to use of water holes.

Any municipality, as defined in section 7-314, or any property owner on behalf of any such municipality, may construct or maintain open water holes for the purpose of providing fire protection for such municipality, and no such municipality or property owner shall incur any liability as a result of injury to any person arising out of the maintenance of such water hole, provided such water hole has been approved by the fire-fighting organization and the municipality within whose jurisdiction such water hole is situated and provided such approval has been communicated, in writing, to the property owner on whose premises such water hole is situated.