The Rockland County Health Department has issued a boil water order Sunday for some residents in Orangeburg until further notice.
SUEZ Water says the issue stems from a water main break.
It says a loss of water pressure in the main break means there is a greater chance that untreated water or harmful microbes could enter the system.
Customers should boil their water for one minute before drinking, cooking, baking, washing dishes, making ice cubs or brushing teeth.
Officials say water does not have to be boiled before showering or washing clothes.