Warnings went out to residents that a boil water advisory would be in effect Monday afternoon for Mossbank, about 145 kilometres southwest of Regina.
That's because crews planned to make some repairs to the town's pumphouse, but then a main water line ruptured.
Town administrator Cynthia Kimball says it's not known how long the town will be without water.
Residents were given one hour Monday night to fill their tanks and are being reminded that all water used for washing or consumption needs to be boiled, once water is restored to the area.
Farmers who got water from the town's bulk tanks are now being re-routed to Assiniboia.