D.C.’s Flush Problem: Raw Sewage in the Anacostia

December 27, 2005 - 8:57am
cso_sign (WTOP Radio/Mitchell Miller)

Mitchell Miller, WTOP Radio
Colleen Kelleher, wtopnews.com

WASHINGTON - Every time a federal worker flushes a toilet in the District, what's flushed has the potential to end up in the Anacostia River, especially if it's raining heavily.

That may sound extreme, but it's a fact.

Last year 1.4 billion gallons of raw sewage ended up in the Anacostia River, according to the D.C. Water and Sewer Authority. More than 70 times during the year sewage overflowed into the river.

Some 740 million gallons of sewage flowed into the Anacostia between Jan. 1, 2005 and June 24, 2005.

The numbers are even more dramatic when you factor in the Potomac River, Rock Creek and the tributaries of all three. According to 2004 WASA data, 2.4 billion gallons of raw sewage flowed into those waterways.

Raw sewage is sewage that has not been processed at D.C.’s Blue Plains Treatment Plant, the largest advanced wastewater treatment plant in the nation.

While the treatment plant uses advanced technologies to treat waste, the problems with sewage occur on the way to plant.

OLD INFRASTRUCTURE

“Basically, we've got a very old infrastructure throughout the watershed,” says Edward Graham, director of water resources for the Metropolitan Washington Council of Governments. “It's some of the oldest development in the metropolitan area. We're paying the price for problems that were introduced decades, maybe even a century ago.”

About one-third of the District, including the Capitol and most federal government buildings, is served by a combined sewer system built at the end of the 19th century. A combined sewer system takes sanitary sewage and storm water to the treatment plant through one piping system. The rest of the city has separate systems – one for sewage from homes and businesses and another for storm water. See graphics about how each system works in the photo gallery.

It takes 0.5 inches of rain to cause overflows at 11 of 16 outfalls. When it rains really hard, sewage gushes into the Anacostia River at these locations.

So how often does D.C. see more than 0.5 inches of rain?

This year -- up through June 26, 2005 -- it's rained at least that much on nine days.

DATEAMOUNT OF PRECIPITATION
Jan. 14, 2005 1.82 inches
March 8, 2005 0.66 inches
March 23, 2005 1.85 inches
March 28, 2005 1.5 inches
April 2, 2005 1.79 inches
April 30, 2005 1.16 inches
May 14, 2005 1.12 inches
May 19, 2005 0.55 inches
June 3, 2005 0.64 inches
Through June 2004, there were 11 days with more than 0.5 inches of rain, says Weather Channel meteorologist David Maddux. And, for all of 2004, there were 25 days in which the rainfall exceeded 0.5 inches.
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