McMillan Sand Filtration Site
E747857
McMillan Sand Filtration Site is a historic former water-treatment facility in Washington, D.C., known for its early 20th-century sand filtration system and distinctive underground cells and park-like grounds.
All labels observed (1)
| Label | Occurrences |
|---|---|
| McMillan Sand Filtration Site canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T8643817 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: McMillan Sand Filtration Site Context triple: [Stronghold neighborhood, near, McMillan Sand Filtration Site]
-
A.
Bouse Hills Pumping Plant
Bouse Hills Pumping Plant is a major water-lifting facility within the Central Arizona Project system that helps convey Colorado River water across central Arizona.
-
B.
Croton Water Filtration Plant
The Croton Water Filtration Plant is a major underground water treatment facility in New York City that filters and improves drinking water drawn from the Croton water supply system.
-
C.
Tracy Pumping Plant
Tracy Pumping Plant is a major water pumping facility in California that lifts and conveys water from the Sacramento–San Joaquin Delta into the Central Valley Project’s distribution system.
-
D.
Frenchman Hills Wasteway
Frenchman Hills Wasteway is an irrigation and drainage channel in central Washington State that conveys water from Potholes Reservoir through the Frenchman Hills area as part of the Columbia Basin Project.
-
E.
Western Treatment Plant
The Western Treatment Plant is a major sewage treatment and recycled water facility in Melbourne, Australia, known for its large-scale wastewater processing and significant wetlands that support diverse birdlife.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: McMillan Sand Filtration Site Target entity description: McMillan Sand Filtration Site is a historic former water-treatment facility in Washington, D.C., known for its early 20th-century sand filtration system and distinctive underground cells and park-like grounds.
-
A.
Bouse Hills Pumping Plant
Bouse Hills Pumping Plant is a major water-lifting facility within the Central Arizona Project system that helps convey Colorado River water across central Arizona.
-
B.
Croton Water Filtration Plant
The Croton Water Filtration Plant is a major underground water treatment facility in New York City that filters and improves drinking water drawn from the Croton water supply system.
-
C.
Tracy Pumping Plant
Tracy Pumping Plant is a major water pumping facility in California that lifts and conveys water from the Sacramento–San Joaquin Delta into the Central Valley Project’s distribution system.
-
D.
Frenchman Hills Wasteway
Frenchman Hills Wasteway is an irrigation and drainage channel in central Washington State that conveys water from Potholes Reservoir through the Frenchman Hills area as part of the Columbia Basin Project.
-
E.
Western Treatment Plant
The Western Treatment Plant is a major sewage treatment and recycled water facility in Melbourne, Australia, known for its large-scale wastewater processing and significant wetlands that support diverse birdlife.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
civil engineering structure
ⓘ
former water-treatment facility ⓘ historic site ⓘ |
| adjacentTo | McMillan Reservoir NERFINISHED ⓘ |
| architecturalStyle | Beaux-Arts landscaping elements ⓘ |
| category |
Historic districts in Washington, D.C.
ⓘ
Industrial archaeological sites in the United States ⓘ Water infrastructure in Washington, D.C. ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| currentUse | vacant site with restricted access ⓘ |
| hasFunction |
water filtration
ⓘ
water treatment ⓘ |
| hasPart |
control house
ⓘ
earthen berms ⓘ manholes ⓘ park-like surface grounds ⓘ sand beds ⓘ underground filtration cells ⓘ valve houses ⓘ |
| hasView | United States Capitol dome NERFINISHED ⓘ |
| heritageDesignation |
District of Columbia Inventory of Historic Sites
NERFINISHED
ⓘ
National Register of Historic Places ⓘ |
| inception | 1900s ⓘ |
| locatedIn |
Bloomingdale neighborhood
NERFINISHED
ⓘ
Northwest Washington, D.C. ⓘ Washington, D.C. ⓘ |
| locatedNear |
Children’s National Hospital
NERFINISHED
ⓘ
McMillan Reservoir NERFINISHED ⓘ Washington, D.C. Veterans Affairs Medical Center NERFINISHED ⓘ |
| locatedOn | North Capitol Street NERFINISHED ⓘ |
| materialUsed |
brick
ⓘ
concrete ⓘ |
| namedAfter | McMillan Reservoir NERFINISHED ⓘ |
| notableFeature |
grid of underground vaulted cells
ⓘ
large open green space in an urban area ⓘ |
| NRHPType | historic district ⓘ |
| operator | District of Columbia government NERFINISHED ⓘ |
| ownedBy | District of Columbia government NERFINISHED ⓘ |
| partOf | Washington Aqueduct system NERFINISHED ⓘ |
| replaced | Washington, D.C. slow sand filtration facilities at older locations ⓘ |
| significantFor |
early large-scale sand filtration technology in the United States
ⓘ
public health improvements in Washington, D.C. ⓘ |
| significantPeriod | early 20th century ⓘ |
| startDate | early 1900s ⓘ |
| status | decommissioned water-treatment facility ⓘ |
| subjectOf |
historic preservation debates
ⓘ
redevelopment proposals ⓘ |
| topography | gently sloping lawn ⓘ |
| usedFor | municipal water supply for Washington, D.C. ⓘ |
| usesMethod | slow sand filtration ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: McMillan Sand Filtration Site Description of subject: McMillan Sand Filtration Site is a historic former water-treatment facility in Washington, D.C., known for its early 20th-century sand filtration system and distinctive underground cells and park-like grounds.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.