Residents and businesses west of the Willamette River that have Portland water as a source may now drink tap water without boiling it first. Follow-up testing of drinking water has shown the absence of bacterial contamination. The Portland Water Bureau recommends flushing all taps for 2 minutes, or until the water runs cold, before consuming it for the first time. This will flush any potentially contaminated water from the plumbing.
The Portland Water Bureau issued a ‘Boil Water Notice’ on Saturday, July 21, 2012 in response to a second positive test for bacterial contamination in Reservoir 3 in Washington Park. Customers of the Portland Water Bureau west of the Willamette River within the city limit were affected. Customers of Burlington Water District, Valley View Water District, Palatine Hills Water District, City of Tigard, Lake Grove Water District, and West Slope Water District were also affected.
Portland Water Bureau and wholesale customers east of the Willamette River along with Tualatin Valley Water District, Southwood Water District and Raleigh Hills Water District were not affected.
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Source Article from http://www.portlandonline.com/oem/index.cfm?a=405501