All water in the City of Portland should be boiled due to the water supply testing positive for the E. coli bacteria, according to a release by the Portland Water Burea Friday morning.

“Until further notice, all Portland Water Bureau customers and those in the affected areas should boil all tap water used for drinking, food preparation, tooth brushing and ice for at least one minute,” the release said.

The presence of the bacteria was confirmed after tests performed from May 20 to May 23 from water collected at the outlets of the Mt. Tabor Reservoir, as well as the SE 2nd Avenue and Salmon Street water stations.

“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,” Portland Water Bureau Administrator David Shaff said in the release. 

The warning affects all Portland Water Bureau customers, as well as the following areas:

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
West Slope Water District

There is no time estimate on when the boil warning will be lifted. There is a live blog of updates from The Oregonian.