Ellsworth Air Force Base officials are investigating why it took three days for them to be notified that E. coli bacteria was found in the base's water supply.
Base residents were told Saturday to boil water before drinking it. The order is expected to be in place until sometime Tuesday.
Base spokeswoman Rachel Allison said the original water sample that tested positive was drawn Tuesday. Results from a base unit typically are known within 24 hours. But the report of a positive test didn't surface until Friday. A second sample was immediately taken and also tested positive.
Allison says the base is investigating whether proper procedures were followed.
E. coli can make people sick, but no illnesses were reported.
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