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DES MOINES, Iowa (AP) — Residents in major cities downstream from a northwest Iowa tanker car derailment said Monday they’re confident that municipal drinking water is safe even as crews try to contain an estimated 230,000 gallons of oil.

Officials in Omaha, Nebraska, and Council Bluffs, Iowa, said they’re monitoring the situation and are prepared to switch to well water if oil is detected in the Missouri River, which provides most of their water.

But they’ve been assured by the Iowa Department of Natural Resources that the oil spilled into the Little Rock River will be contained before reaching the Missouri River.

The department referred questions to the U.S. Environmental Protection Agency, which said in a statement that containment strategies are being evaluated because of recent and expected rain in the area.

Heavy rain is possible, according to the National Weather Service, and the Rock River is forecast to remain in flood stage through Wednesday.

Andy Williams, a spokesman for BNSF railroad, said oil has been removed from 24 of the 32 rail calls involved in the derailment, including 14 cars that were compromised. The other eight cars, which aren’t leaking oil, were cleared from the track, but crews aren’t expected to be emptied until Wednesday.

Crews have been repairing the tracks, Williams said, with the goal of returning them to service Tuesday.

Williams said much of the spilled oil has been contained to an area east of the tracks where skimmers are recovering oil. Floating barriers were installed about 5 miles downstream to capture any oil carried by floodwaters, Williams said.

Those efforts are intended to keep the oil from reaching larger communities downstream. The spill reached the Rock River, which joins the Big Sioux River before merging into the Missouri River at Sioux City, about 60 miles southwest of Doon.

Officials in Sioux City and the neighboring communities of South Sioux City, Nebraska, and North Sioux City, South Dakota, said they rely on groundwater for their drinking supplies, so they wouldn’t be immediately affected by oil making it into the nearby rivers. Sioux City would likely shut off some of its wells if they detected oil.

“We have seen no evidence of it,” said Sioux City water plant superintendent Brad Puetz.

Omaha and Council Bluffs, located about 140 miles southwest of where the tanker cars derailed in Iowa’s Lyon County, do rely on the Missouri River for drinking water.

Rock Valley, located just southwest of the spill, shut off its water wells within hours of the spill and will instead rely on the nearby rural water system. Cody Tiedeman, manager of the Rock Valley Rural Water District, said the district’s wells are more than 10 miles away from the spill and are safe from contamination.

Gov. Kim Reynolds issued disaster declarations for Lyon, Plymouth, Sioux and Woodbury counties on Saturday. She issued additional declarations for Hancock, Humboldt, Plymouth, Sioux and Winnebago counties on Monday.

Reynolds visited Rock Valley and the Doon spill site on Saturday as part of a tour of flood-related damage. Rainy conditions across the state the past week swelled many rivers, resulting in flooding over the weekend.