DC Water said it could take over a month to repair the large pipe that ruptured and sent millions of gallons of wastewater into the Potomac River last month.

While local organizations have assured the public that drinking water is still safe, some Maryland counties have released health advisories urging people to stay away from the sites of the spill near the C&O Canal National Historical Park.

The delay in repairs is apparently due to an unexpected blockage. So how is all of this affecting the health of the Potomac River?

Betsy Nicholas, president of the Potomac Riverkeeper Network, told WTOP anchors Anne Kramer and Shawn Anderson on Monday that the sewage spill was worse  than the 1989 Exxon Valdez oil spill and the 2010 BP Deepwater Horizon oil spill when it comes to size.