New information has emerged on the massive sewage spill in the Potomac River in January, when a sewer line in the C&O Canal National Historical Park in Montgomery County collapsed, sending more than 200 million gallons of untreated wastewater into the river.

In an exclusive report, The Washington Post has learned that D.C. Water had planned to reinforce that line years earlier, but construction was repeatedly delayed during a federal environmental review.

Now, D.C. Water and the National Park Service are blaming each other.

Washington Post investigative reporter Aaron Davis broke the story, and he joined WTOP’s Nick Iannelli to breakdown the latest.

Read and listen to the interview below.

The following transcript has been lightly edited for clarity.