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Truckloads of drinking water are coming to the eastern Montana city of Glendive after traces from a major oil spill along the Yellowstone River ended up detected in public water supplies, raising concerns about a potential health risk.

Preliminary tests at the city’s water treatment plant found at least some oil got into a water supply intake along the river, according to state and federal officials. About 6,000 people end up served by the intake, Glendive Mayor Jerry Jimison said.

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Officials said they were bringing in the shipments of drinking water as a precaution and did not know yet whether there was any health threat. Results of further tests to determine the scope of the danger will come in a day or two.

Up to 50,000 gallons of oil spilled in the pipeline accident Saturday. Cleanup crews trying to recover the spilled crude ended up hampered by ice that covered most of the river, making it hard to find the oil.

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Initial tests of water supplies Saturday and Sunday revealed no evidence of oil. But by late Sunday, residents began complaining that the water coming from their taps had an unusual odor, officials said.

An advisory against ingesting water from the city’s treatment plant came out late Monday.

Glendive City Councilman Gerald Reichert said he first noticed an odor in the water at his house Sunday night. He said it smelled like diesel fuel.

Officials with Bridger Pipeline LLC of Casper, Wyoming, said the break in the 12-inch steel pipe happened in an area about 5 miles upstream from Glendive, an agricultural community in east-central Montana near the North Dakota border.

Bridger spokesman Bill Salvin said Monday the company is confident that no more than 1,200 barrels – or roughly 50,000 gallons – of oil spilled during the hour-long breach.

There was a visible oil sheen near Sidney, almost 60 river miles downstream from Glendive, said Paul Peronard, the on-scene coordinator for the U.S. Environmental Protection Agency.

Officials were putting booms in areas of open water to try to trap oil. Near Crane, which is about 30 miles downstream from the spill, crews were chopping holes into the ice in hopes they would be able to vacuum up crude as it comes down the river in coming days.

“These are horrible working conditions to try to recover oil,” Peronard said. “Normally you at least see it, but you can’t see it, you can’t smell it. … We’re going to have to hunt and peck through ice to get it out,” Peronard said.

Bridger Pipeline crews were still working Monday to determine exactly where the breach occurred.

If it happened on the bank, some of the oil may end up trapped in the soil near the river. If it was beneath the river, “Then it’s all in the river,” Peronard said.

He said the impact of someone suffering exposure to the contaminated water is probably different than long-term chronic exposure would be. Long-term impact would be more dangerous.

The Poplar Pipeline system runs from Canada to Baker, Montana, and carries crude oil from the Bakken oil producing region in Montana and North Dakota. It remained shut down Monday while crews planned to pump out any remaining oil from the section of the pipeline where the breach occurred.

The pipeline receives oil at the Poplar Station in Roosevelt County, Fisher and Richey stations in Richland County, and at Glendive in Dawson County, all in Montana. It underwent an inspection in 2012, Salvin said, and is at least 8 feet below the Yellowstone River bed where it crosses the river near Glendive.

Bridger Pipeline, a subsidiary of True Cos., also owns and operates the Four Bears Pipeline System in North Dakota along with the Parshall Gathering System and the Powder River System in Wyoming, according to the company’s website.

Bridge Pipeline Vice President Tad True said the company apologizes for the spill and has taken responsibility for the cleanup.

The company will not be able to restart the pipeline until it receives approval from the U.S. Department of Transportation’s Pipeline and Hazardous Materials Safety Administration (PHMSA). Inspectors from the federal agency were at the spill and also planned to inspect Bridger Pipeline’s control room in Casper, Wyoming, to gather more information, PHMSA spokeswoman Susan Lagana said.

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