oil

Regulators want to know the risks that flawed welding or shifting ground could pose for more breaks on the Keystone, which has spilled repeatedly since 2011.

Trucks are hauling oil-drenched soil to a landfill near Omaha. Crews are building a five-acre pond to continue treating contaminated water.

The Keystone is Washington County's biggest source of property taxes for schools and other local government, but the company didn't pay for 10 years.

The Keystone's biggest spill ever happened on Dec. 7 in Washington County. The cleanup is ongoing.

It’s been almost two months since the Keystone pipeline erupted and crude oil rained down upon several acres of native prairie and cropland, and polluted more than three miles of Mill Creek. Hundreds of workers have been hustling around the clock to recover the oil, but landowners want more information about the cleanup and about why the pipeline broke.

Hundreds of workers have been hustling around the clock to recover the oil. Some landowners want more information about the cleanup and about why the pipeline broke.

Two pipelines, including the Keystone that ruptured on Dec. 7, are the most important local sources of tax revenue for Washington County

Crews continue to remove oil from several miles of Mill Creek that are now blocked off from the rest of the creek. Contamination downstream is decreasing.

A Michigan scientist warns that dilbit can seem to disappear, only to turn up later. This mystery may have to do with how the oil binds to other particles in water.

TC Energy hasn't said yet what caused the Keystone's biggest spill. And it didn't answer a question about the pipeline's operating pressure when the spill happened.

Hundreds of thousands of gallons of crude oil spilled out of the Keystone Pipeline in north-central Kansas, and cleaning it up will be especially difficult. Plus: Kansas nursing homes are facing allegations of neglect, even after receiving rewards for more thoughtful care.

The oil spill is the biggest in the Keystone pipeline's history and it dumped a sludgy form of crude oil that poses special challenges for a cleanup.