Grayslake residents and others in the village may return to using tap water for drinking and other purposes, officials announced Friday.
Results from water samples tested show no contamination resulted from a drop in pipeline pressure discovered about 12:30 p.m. Wednesday. That result led to the lifting of the boil order after nearly two days.
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Bill Heinz, the village's public works director and engineer, said officials did not suspect any contamination, but the water samples had to be sent to a laboratory for testing under Illinois Environmental Protection Agency regulations. Village officials said the water system lost significant water pressure for roughly a half-hour Wednesday. The boil order for all village businesses and homes went into effect about 2:30 p.m.
Officials said an investigation indicates the frigid weather earlier this week led to a malfunction in the automatic operating system that triggered the water pressure drop. Crews quickly corrected the problem by overriding the system and manually pumping water back into it to increase the pressure.
Grayslake's elementary and high school systems had encouraged students to bring bottled water with them while the boil order was in effect.