The city of Dayton, Ohio, is telling residents their water is OK to use again without being boiled first.
City authorities said late Friday morning that water samples were clear of bacteria.
However, some 15,000 to 20,000 customers elsewhere in Montgomery County remained under a boil-water advisory.
A household or business is counted as one customer.
Crews located a water-line leak Thursday under the Great Miami River, but high river levels have hindered repair work.
There’s been no word on the break’s cause.
Schools resumed Friday, a day after many closed.
The Dayton school district says bottled water is available in all buildings.
Dayton officials estimated 75,000 people — more than half the city’s population — began Friday under the boil-water advisory.

YOUNGSTOWN — Late Friday night, the Youngstown Water Department experienced a water depressurization event due to a disruption of a major distribution waterline.
The failure affected customers on the West Side of Youngstown and east side of Austintown.
Due to the low water pressure that resulted from the disruption, the Youngstown Water Department is recommending all water customers in the affected area east of Raccoon Road, north of New Road and west of Belle Vista Avenue boil their water that is used for drinking and cooking.
A roiling boil for one minute is adequate, Dan Blakely, engineering assistant for the city, wrote in an email to the media.