The body found in the D.C. sewer system near the Kennedy Center last month was a homeless man known to local social workers.
Workers found the body at the Potomac Pumping Station, D.C. Water said.
It was caught in a series of filters.
Investigators aren't sure where the man entered the sewer system, which stretches from Dulles International Airport in Virginia through Montgomery County, Maryland, and into the District, or how he died.
The D.C. Department of Human Services is working with DC Water to identify locations where homeless might be able to gain access to the sewers when looking for shelter.
The sewage station is used to filter solid waste. The discovery of the body has no impact on drinking water.