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In page Water tower:
"If the pumps fail (such as during a power outage), then water pressure will be lost, causing potential public health concerns. Many U.S. states require a "boil-water advisory" to be issued if water pressure drops below 20 pounds per square inch (140 kPa).[citation needed] This advisory presumes that the lower pressure might allow pathogens to enter the system.[citation needed]
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