Massive sewage spill could plague Potomac River through most of 2026 Feb 17, 2026 · Matt Delaney · washingtontimes.com read more » Local water officials say it will take at least another month before they can begin repairing the aging pipe from which millions of gallons of waste have flowed into the Potomac River, in one of the largest sewage spills in U.S. history. Read more »