Fillmore county Sheriff Tom Kaase announced the change just after noon Wednesday, after clearance from the Minnesota Health department and City of Ostrander officials.
The community had been under a boil advisory since Monday night after a heater failure in a pump house lead to pipes freezing.
Ostrander then had to go to a backup water source, but that source had been disconnected from the system for some time, and crews needed to test it for safety.
Those test results came in Wednesday.
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