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PORTLAND, Ore. (AP) - A citywide boil notice was issued for Portland, Oregon, after state health officials detected E. coli in the water supply.

The Portland Water Bureau said Friday that residents should boil all tap water used for drinking, food preparation, tooth brushing and ice for at least one minute. Ice or any beverages prepared with un-boiled tap water on or after Tuesday should be dumped.

The notice, which also covers some suburban cities, affects about 670,000 people. It will remain in effect until tests show the water system is clean.

The samples that tested positive for bacteria were collected this week from two uncovered reservoirs at Mount Tabor. The Water Bureau said it collects about 240 bacterial samples per month throughout the system, and the test to determine the presence of bacteria takes 18 hours.

The Water Bureau is investigating the cause of the contamination. The city said contamination can occur when there is a loss of water pressure, a pipe breaks or when conditions expose drinking water to outside elements.

"The chance of any health problems related to this water test result is low," Tri-County Health Officer Dr. Paul Lewis said. "If any problems occur, we would expect diarrhea."

The Water Bureau drew national attention last month when it discarded more than 35 million gallons of drinking water because a teenager allegedly urinated into a reservoir at Mount Tabor. That reservoir was one of the two that tested positive for E. coli.



Copyright 2014 USATODAY.com

Read the original story: E. coli detected in Portland, Oregon, water supply

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