About 900 Pennsylvania American Water customers in the City of Butler, Butler Township and Center Township were placed under a precautionary boil water advisory Saturday.

Heather DuBose, external affairs specialist for Pennsylvania American Water, said there was a loss of water pressure Saturday at a water storage tank in the City of Butler following a 12-inch water main break along Delwood Road in Butler.

The broken main limited the company’s ability to replenish the water storage tank and local system.

Crews finished repairing the pipe, and service was restored to customers in the affected areas Saturday evening, according to Pennsylvania American Water. Tank water levels have returned to normal and water quality sampling is underway.

If all goes well, the advisory will be lifted on Monday, a spokeswoman said.

The utility said customers might experience cloudy or discolored water. If water is discolored, customers should wait until it runs clear before using.

A loss of water pressure creates conditions that could allow contamination to enter the distribution system through backflow by backpressure. As a result, there is an increased chance that the water might contain disease-causing organisms.

DuBose said, “This is a precautionary boil water advisory and is out of an abundance of caution. Customers can continue to use the water for washing and showering/bathing, but are urged to boil water before consuming it.”

The company cautioned people not to drink the water without boiling it first.

Bring all water to a rolling boil, let it boil for one minute, and cool before using; or use bottled water. Customers should use boiled or bottled water for drinking, making ice, washing dishes, brushing teeth and food preparation until further notice.

Inadequately treated water might contain disease-causing organisms. These organisms include bacteria, viruses and parasites, which can cause symptoms such as nausea, cramps, diarrhea and associated headaches.

These symptoms are not caused only by organisms in drinking water, but also by other factors.

People with severely compromised immune systems, infants and some elderly may be at an increased risk. These people should seek advice about drinking water from their health care providers.