Reuters: A Seattle suburb was making progress cleansing its E. coli-contaminated water supply through system-wide flushes and chlorine injections, a task made more urgent after the potentially deadly bacteria sickened a child, officials said on Tuesday.
Tests first showed the bacteria in the water supply on Mercer Island on Sept. 26, forcing area schools to close for a day as health officials collected thousands of samples to try to locate the source of the contamination.
The alert was lifted last week…

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