over storm drainage and the location of utilities; and it provides
refuse disposal service within the Sanitary District. It also operates a
refuse collection system in the suburban portions of Montgomery
County. The Commission has been designated as the organization
responsible for the administration, maintenance and operation of the
Anacostia River Flood Control and Navigation Project. As of Decem-
ber 31, 1962, the water and sewerage systems of the Commission
contained 1,982 and 1,713 miles of mains, respectively.

Two major sources of water now supply the Washington Suburban
Sanitary Commission system. The Patuxent River, which the Com-
mission has impounded with the construction of two dams near
Brighton in Montgomery County and near Laurel in Prince George's
County, gives the Commission a yield of 65 million gallons a day
through the Patuxent Filtration Plant. The Potomac River supplies
raw water to the new Potomac River Filtration Plant. This facility
opened in 1961 and it has an initial capacity of 30 million gallons a
day. Eventually it will be expanded, as needed, to a capacity of at
least 200 million gallons a day, and it will serve both counties. Wells
located on the Potomac slopes of Prince George's County provide a
third source of water.

Most of the sewage from the Commission service area is trans-
ported through trunk sewers into the District of Columbia and is
treated at the District's Blue Plains Sewage Plant. The Commission
pays for this service on a metered volume basis, and it also con-
tributes its share to capital improvement of the Blue Plains facility.
The single sewage disposal plant operated by the Washington Subur-
ban Sanitary Commission is at Laurel.

The Commission's facilities are geared to an anticipated growth
of the service area population to about 2,000,000 by the year 2000. The
Commission annually reviews and updates a five-year program for
development of its water and sewerage systems.
(Acts, 1918, chap. 122, as amended from time to time, e.g.,
Acts 1947, chap. 733; Acts 1949, chap. 728; Acts 1953, chaps.
430 and 434; Acts 1959, chaps. 618 and 710; Acts 1961, chap.
740; Acts 1963, chap. 812).