*UPDATED: Feb. 1, 2017 at 12:20 p.m.
Approximately 100,000 Pittsburgh Water and Sewer Authority customers are under a flush and boil order.
The authority said the order for the central and eastern neighborhoods is “precautionary.”
It was issued after “the result of recent disinfection and chlorine testing taken at a single location near the Highland Park drinking water filtration plant.”
PWSA officials said there's no evidence that the water is unsafe or contains bacteria.
A map of the neighborhoods impacted can be found at pgh2o.com.
PWSA officials said residents in the affected area should flush taps by running water for at least one minute and then boil water for one minute and let it cool before using it for drinking, food prep, washing dishes and brushing teeth.
Mayor Bill Peduto's office also said water buffalo tanks were expected to be available around noon Wednesday at 10 Pittsburgh fire stations and the fire academy. Water is only available for residents affected by the order and must bring their own containers.
Pittsburgh Public Schools is also closing two dozen schools Wednesday because of the flush and boil order.
— Sarah Schneider (@sarahschni) February 1, 2017
Affected customers were notified through the authority’s automated call system. The same customers will be notified through the same system when the flush and boil order is lifted.
The advisory was expected to last up to three days. The city is setting up water buffaloes and other distribution points where residents can get bottled water.
The Associated Press contributed to this report.