United Water Pennsylvania is alerting customers in parts of Mechanicsburg that they must boil their drinking water.
The company said a large main break Tuesday caused loss of water pressure to customers in the areas of Trindle Station and the Mechanicsburg High School, and now there is an increased chance the water may have disease-causing organisms.
The affected customers are north of the Pennsylvania Turnpike, west of York Street, east of Sinclair Road and south of Green Acres Street.
Water for drinking, making ice, washing dishes, brushing teeth and food preparation should be brought to a rolling boil for one minute and cooled, or bottled water should be used instead.
United Water said it expects the boil water advisory to be in effect for at least the next two days.
The break in the 12-inch main occurred at around 6 a.m. on Brackbill Road near Salem Church Road in Hampden Township. It caused a loss of water pressure for customers in Mechanicsburg and portions of Hampden, Monroe and Silver Spring townships.
United Water said the break was caused by the cold weather.