Residents of 82 homes in North Bend were warned not drink their water after the utility discovered evidence of coliform bacteria.
The Sallal Water Association learned last week that a water tank supplying the Riverpoint-Mount Si neighborhood was vandalized and white pellets were found near the site.
The King County Sheriff’s Office says someone cut several locks and monitoring equipment at the tank site.
The association says it chlorinated the tank under the direction of the Washington state Department of Health.
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The association says the bacteria "might have been related to the vandalism incident," but a connection has not been confirmed.
State regulators are evaluating water samples, and the association expects results within a few days.
North Bend is about 28 miles (45 kilometers) east of Seattle.