Enbridge has halted testing of newly installed oil storage tanks in northwestern Indiana after a blue dye used in the testing colored miles of local waterways.

Indiana Department of Environmental Management spokesman Dan Goldblatt says Enbridge was testing the tanks for leaks using water infused with dye before releasing that water into local sewers.  The dye was visible for several miles in tributaries that feed into the Little Calumet River. Enbridge spokeswoman Jennifer Smith says the company has halted its testing and is installing a filtration system to remove the coloring from the waterways.