Bloomingdale in Northwest Washington in Washington, District of Columbia — The American Northeast (Mid-Atlantic)

Regulator House

McMillan Sand Filtration Plant

— 1905-1986 —

Regulator House Marker image. Click for full size.

Photographed by Shirley A Stirling, April 8, 2026

1. Regulator House Marker

Inscription.
Seven regulator houses controlled the flow of clean water from the filter beds. A "filter attendant" in each house manually operated sluice gates connected to different beds.

Erected 1905.

Topics. This historical marker is listed in these topic lists: Charity & Public Work • Natural Resources. A significant historical year for this entry is 1905.

Location. 38° 55.41′ N, 77° 0.683′ W. Marker is in Northwest Washington in Washington, District of Columbia. It is in Bloomingdale. It is on Lower Service Court east of 1st Street Northwest, on the right when traveling east. Touch for map. Marker is at or near this postal address: 31 Lower Service Court Northwest, Washington DC 20001, United States of America. Touch for directions.

Regionally, this marker is in the Washington Metropolitan Area.

It is also in the American Northeast,

in the Upper South,

in the Mid-Atlantic,

in the Tidewater,

and in the Chesapeake Bay Region.

Globally, it is in the North Atlantic Region,

North America,

the Western Hemisphere,

the Western World,

and the Anglosphere.

Other nearby markers. At least 8 other markers are within

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walking distance of this marker: Sand Washer (here, next to this marker); Sand Bin (a few steps from this marker); Iconic Landmark / Fitting Tribute (about 300 feet away, measured in a direct line); Green Space / Sustaining the City (about 300 feet away); Central to the System / How It Worked (about 500 feet away); Filter Bed (about 500 feet away); Court Nullifies Racial Covenants (approx. 0.2 miles away); Water for the City (approx. 0.3 miles away). Touch for a list and map of all markers in Northwest Washington.

Regulatory House #5, 1944. image. Click for full size.

Photographed by Shirley A Stirling, April 8, 2026

2. Regulatory House #5, 1944.

Archives of the Washington Aqueduct

Regulatory House Marker image. Click for full size.

Photographed by Shirley A Stirling, April 8, 2026

3. Regulatory House Marker

Playground Regulator House image. Click for full size.

Photographed by Shirley A Stirling, April 8, 2026

4. Playground Regulator House

The playground on site has a toy regulator house.

Credits. This page was last revised on April 16, 2026. It was originally submitted on April 8, 2026, by Shirley A Stirling of Lacey, Washington. This page has been viewed 25 times since then. Last updated on April 15, 2026, by Shirley A Stirling of Lacey, Washington. Photos: 1. submitted on April 8, 2026, by Shirley A Stirling of Lacey, Washington. 2, 3. submitted on April 9, 2026, by Shirley A Stirling of Lacey, Washington. 4. submitted on April 15, 2026, by Shirley A Stirling of Lacey, Washington. • Devry Becker Jones was the editor who published this page.