Results from water-quality tests are expected by Friday evening after an overnight water main break and leak under the Great Miami River that left thousands of residents without water or with low water pressure.
The affected line was located just west of the Keowee Street Bridge, a spokesperson for Dayton says.
But a boil advisory remains in effect for parts of Montgomery County.
Approximately 30,000 service connections, or around 75,000 residents, are in areas affected by the boil advisory.
Montgomery County Health Commissioner Jeff Cooper says the boil advisory is a precaution.
"We’re asking all individuals to adhere to it until test results come back confirming that there is no contamination," Cooper says.
County officials also invite residents to call a helpline to find out whether your address falls under the current boil advisory: 937-781-2688.
UPDATE at 10:50 a.m.: City spokesperson Bryan Taulbee says the following Kroger locations will be distributing donated bottled water to those affected by the city’s water outage beginning at 11:30 a.m. Thursday: 3520 W. Siebenthaler Ave. 1934 Needmore Rd.
UPDATE at 10:00 a.m.: City officials say Dayton’s widespread water outage was caused by a leak in pipes under the Great Miami River.
— The City of Dayton has issued a boil advisory for Montgomery County water customers using the Dayton water system.

(WANE) – A boil water advisory put into place in Wolcottville after a fire fight drained the town’s water supply has been lifted.
The town normally pumps 80,000 to 100,000 gallons of water a day.
On the day of the fire, it pumped over 220,000 gallons.
Days later, a boil water advisory was issued as a safety precaution.
"It didn’t necessarily ran out of water," Utilities Superintendent Darin Garrett said.
Garrett said when the pressure in the water system gets that low, the town issues a boil water notice as a precaution.
His team is sending two water samples to the Indiana Department of Environmental Management so they can give the all clear.
That rang true.
On Wednesday, the town lifted the boil water advisory.
For Twin Six Restaurant, the advisory meant a small loss of business.

It’s the same line that has lead to a boil water advisory for people living in Monessen, Charleroi and Speers.
The water was turned off for about 15 to 20 minutes Wednesday afternoon, according to the Water Authority.
About 3,000 customers are impacted and are using the water buffaloes, including 90-year-old Irene Sarran.
"You need it for your teeth.
You don’t realize how much you need water until something like this happens," Sarran said.
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The Department of Environmental Protection will test the water quality Wednesday and Thursday to ensure the water is safe to drink.
Once the Water Authority receives confirmation that the water is safe, the advisory will be lifted.
The original break was repaired Tuesday evening, but officials in the community said it ruptured again.
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DAYTON — All residents who use the city of Dayton’s water service need to boil their water before cooking or drinking with it until officials can find out what the problem is with the system, city Water Director Michael Powell said Wednesday night at City Hall.
“We are experiencing varying levels of pressure and also outages system wide,” Powell said.
“The city of Dayton and Montgomery County’s water departments are working very feverishly to identify the problem and isolate it and we ask that the citizens continue to conserve water and observe the precautionary boil advisory.” Powell said additional crews have been called in.
“We’re still evaluating the problem,” city spokeswoman Toni Bankston said.
“We’re asking everyone to not use their water until we can evaluate the system,” she said.
Dayton Fire Department District Chief Adam Landis said, “We have crews and equipment in place.
We have equipment on the apparatus.
“We are prepared for this type of contingency that the crews are ready for and we’ve talked to the surrounding departments and we are ready to go,” he said.
“We have equipment in place and manpower in place and we are prepared for this type of emergency,” Landis said.
“We have some additional equipment in place and apparatus to make sure we have adequate water supply.” We will update this developing report as we learn more.

EAST FELICIANA PARISH – Residents in Clinton are frustrated with the growing water concerns.
This time, boil advisories were not issued for a recent water line break.
The issue has since been fixed, but Smith stopped by the mayor’s office to question why the city was not advised to boil their water.
"Why wasn’t there a boil water notice because the lines had busted?"
Smith said.
"I don’t understand.
In July, the water issue was so bad, the governor sent in bottled water during one boil order.
The city has repeatedly failed to address problems and now has ten days to notify the state.
It’s terrible."
LDH says they do not have a completed report just yet, and they do not believe the issues have been corrected.

TALLULAH, La.
(KNOE) – Update: 2/10/19 9:15pm The water is back on in the City of Tallulah, after an issue caused a water outage Sunday evening.
Residents are still asked to boil their water before using it, and to use as little water as possible so they can build up the storage tank.
City Spokeswoman Yvonne Lewis says the boil advisory will last until the LA Department of Health clears their water samples, which could take up to 48 hours.
The City of Tallulah is experience an water outage.
In a statement, the city spokeswoman Yvonne Lewis said "water will be out for all of the evening of Sunday, February 10, 2019.
The water outage will likely extend into the morning of Monday, February 11, 2019.
Once water is re-established, all water customers will be under a BOIL WATER advisory until samples have been cleared by the State."

Water District North (WDN) and Lafayette Utilities System (LUS) have issued a Boil Water Advisory for residents and businesses in the area of LA Highway 93 between Gloria Switch Road and Vatican Road.
LUS says that due to an error by private contractor hitting an LUS water line, water pressure dropped significantly this afternoon.
While crews work to repair the damage, LUS is recommending a Boil Water Advisory for the designated area.
Customers in the affected area need to vigorously boil their water for at least one (1) full minute prior to drinking or cooking.
This advisory will remain in effect until further notice.

WOLCOTTVILLE, Ind.
(Fort Wayne’s NBC) – Folks living in the town of Wolcottville will no longer have to boil their water to drink or cook with.
A large fire in the downtown area this weekend essentially emptied the town’s water supply, putting the town water below acceptable levels.
They ran the risk of the water not being safe to drink, so they issued a boil water advisory.
After submitting two samples of water to Indiana water officials, they passed.
READ MORE: Residents take extra caution after city announces boil water advisory

The water boil advisory in Cohoes has been lifted Sunday afternoon.
A DPW member told NewsChannel 13 all samples came back clean.

(FOX Carolina) — Pendleton Water Works is issuing a repeal of the boil water advisory, effective on February 10th, at 4:42 pm.
The advisory was given because pressure was lost due to a water main break on S. Elm Street.
Residents not longer need to boil water prior to consumption.
Samples were taken in the area and came back clear, Water Works released to press.