Any ice or beverages prepared with unboiled tap water on or after May 20 should be thrown out.
The water samples that tested positive for bacteria were collected at Mt. Tabor Reservoirs 1 and 5, as well as the Southeast 2nd Avenue and Salmon Street water sampling station.
Those reservoirs have been taken offline.
Along with Portland Water Bureau customers, other local water providers also fall under the boil water notice. They are: Burlington Water District, City of Gresham (North of I-84), Lake Grove Water District, Lorna Portland Water, Palatine Hill Water District, Rockwood Water District, Tigard Water Service Area (including Durham, King City and Bull Mountain), Valley View Water District and West Slope Water District.
"While we believe at this time that the potential health risk is relatively small, we take any contamination seriously and are taking every precaution to protect public health," said Portland Water Bureau Administrator David Shaff.
Customers will be notified when they no longer have to boil their water after investigators determine the water system is clean of contamination through surveillance sampling.
Contamination can occur when there is a loss of water pressure, a pipe breaks or conditions expose drinking water to outside elements. The Portland Water Bureau is performing a full investigation to identify the cause of the contamination, but workers said it is not always possible to make an exact determination.
Friday, May 23 2014 9:32 PM EDT2014-05-24 01:32:45 GMT
What do I do? All water used for drinking, teeth brushing, food preparation, and ice should be boiled at a full rolling boil for at least 1 minute as a safety precaution. Ice or any beverages preparedMore >
All water used for drinking, teeth brushing, food preparation, and ice should be boiled at a full rolling boil for at least 1 minute as a safety precaution.More >
Wednesday, July 30 2014 7:45 AM EDT2014-07-30 11:45:17 GMT
It's not a disease and it's not contagious, but "Invisible Black Dog Syndrome" is a sad, real condition affecting local animal shelters. The term refers to the propensity of would-be-adopters walkingMore >
It's not a disease and it's not contagious, but "Invisible Black Dog Syndrome" is a sad, real condition affecting animal shelters. More >
Tuesday, July 29 2014 5:50 AM EDT2014-07-29 09:50:38 GMT
Copyright 2014 WWBT NBC12. All rights reserved.More >
Listeria is listed on the the baby's death certificate as an immediate cause of her death. Her mother, says that while she was pregnant, she ate food that was part of a recent, nation-wide Listeria recall.More >
Tuesday, July 29 2014 6:55 PM EDT2014-07-29 22:55:24 GMT
A 24-year-old man has been charged in connection with the June 14 shooting that killed Christopher Mondaine in a parking lot near Sixth Street and Grand Avenue.More >
A 24-year-old man has been charged in connection with the June 14 shooting that killed Christopher Mondaine in a parking lot near Sixth Street and Grand Avenue, Jackson County Prosecutor Jean Peters Baker announced Tuesday.More >
Tuesday, July 29 2014 10:09 PM EDT2014-07-30 02:09:00 GMT
KU and Washburn University among five more schools added to the list of colleges and universities under scrutiny for how they handled investigations into sexual assaults.More >
The University of Kansas and Washburn University are joining a list that college officials won't be bragging about. They are among five more schools added to the list of colleges and universities under investigation for how they handled investigations into sexual assaults.More >