Dalecarlia Water Treatment Plant, 5900 MacArthur Boulevard, Northwest, Washington, District of Columbia, DC

Significance: The Dalecarlia Water Treatment Plant is a component of the Washington Aqueduct, a utility operated by the U.S. Army Corps of Engineers that provides water to Washington, D.C., Arlington County, Virginia. The Dalecarlia Water Treatment plant has been identified as a contributing element to the National Register-eligible Washington Aqueduct Historic District. The Washington Aqueduct is an operational municipal water supply system important for its association with engineering history. The district documents the technological evolution of potable water systems. The district also is important for its association with architects-engineers Montgomery C. Meigs and Allen Hazen, who were the principal designers of the system.
Survey number: HAER DC-54
Building/structure dates: 1922-1939 Initial Construction