A water line break Sunday means residents and businesses in part of the Chapin area need to boil their tap water for at least a minute prior to drinking and cooking with it.
Ice recently made also should be discarded.
Those steps are a precaution against bacterial contamination, authorities said.
The problem affects those along Amicks Ferry Road and in another area northwest of Old Lexington Highway and Sid Bickley Road, officials said.
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Repairs are under way.