Congress in 1980 passed the Comprehensive Environmental Response, Compensation and Liability Act, which established the Superfund program to clean up highly contaminated hazardous waste sites. Almost 20 years later, about half of the 1,231 sites the Environmental Protection Agency placed on the program's National Priority List have been cleaned up or have the methods in place to do so.

Status of National Priority List sites

By percent

Cleanups completed* (419 sites)

34%

Deleted from list (176 sites)

14%

Unfinished cleanups

52%

Breakdown of unfinished cleanups, by percent

All selected methods completed (54 sites)

4%

Methods selected or underway (370 sites)

30%

Methods selected; details on progress not provided (44 sites)

4%

No methods selected; removal activities underway or completed (89 sites)

7%

No methods selected; no removal activities (46 sites)

4%

Other (33 sites)

3%

Total number of sites: 1,231

* All selected remedies have been constructed or implemented, all immediate risks have been addressed, and all long-term risks are under control.

Locations of sites in the District, Maryland and Virginia

Maryland

Priority list sites: 18

Sites deleted from list: 2

Virginia

Priority list sites: 29

Sites deleted from list: 2

District of Columbia

Priority list sites: 1**

**At Washington Navy Yard.

SOURCES: Environmental Protection Agency, General Accounting Office