Later Monday, Collins said six new test results came back without traces of the toxin.
City officials recommended that residents who had not used their water since the ban started flush out their systems by running water. They also cautioned everyone not to all do it at once, and told people not to water lawns or wash cars at the risk of overwhelming the system.
With the warning, worried residents told not to drink, brush their teeth or wash dishes with the water descended on truckloads of bottled water delivered from across the state. The Ohio National Guard was using water purification systems to produce drinkable water.
Some hospitals canceled elective surgeries and were sending surgical equipment that needed sterilized to facilities outside the water emergency, said Bryan Biggie, disaster coordinator for ProMedica hospitals in Toledo.