National Pollutant Discharge Elimination System
E7317
The National Pollutant Discharge Elimination System is a U.S. regulatory permitting program that controls water pollution by regulating point-source discharges of pollutants into waters of the United States.
All labels observed (5)
| Label | Occurrences |
|---|---|
| National Pollutant Discharge Elimination System canonical | 5 |
| NPDES | 4 |
| National Pollutant Discharge Elimination System permit | 3 |
| NPDES permits | 1 |
| Section 402 NPDES permit program | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T77983 — 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: National Pollutant Discharge Elimination System Context triple: [United States Environmental Protection Agency, oversightOf, National Pollutant Discharge Elimination System]
-
A.
Clean Water Act
The Clean Water Act is a landmark U.S. environmental law that regulates the discharge of pollutants into the nation’s waters and sets water quality standards to protect human health and aquatic ecosystems.
-
B.
Resource Conservation and Recovery Act
The Resource Conservation and Recovery Act is a U.S. federal law that governs the management, treatment, storage, and disposal of solid and hazardous waste to protect human health and the environment.
-
C.
National Ambient Air Quality Standards
The National Ambient Air Quality Standards are U.S. federal air pollution limits that set maximum allowable concentrations of key pollutants in outdoor air to protect public health and the environment.
-
D.
Great Lakes Water Quality Agreement
The Great Lakes Water Quality Agreement is a binational accord between the United States and Canada that establishes shared commitments and coordinated actions to protect and restore the water quality and ecosystem health of the Great Lakes.
-
E.
United States Environmental Protection Agency
The United States Environmental Protection Agency is a federal government agency responsible for protecting human health and the environment through regulation, enforcement, and environmental research in the United States.
- 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: National Pollutant Discharge Elimination System Target entity description: The National Pollutant Discharge Elimination System is a U.S. regulatory permitting program that controls water pollution by regulating point-source discharges of pollutants into waters of the United States.
-
A.
Clean Water Act
The Clean Water Act is a landmark U.S. environmental law that regulates the discharge of pollutants into the nation’s waters and sets water quality standards to protect human health and aquatic ecosystems.
-
B.
Resource Conservation and Recovery Act
The Resource Conservation and Recovery Act is a U.S. federal law that governs the management, treatment, storage, and disposal of solid and hazardous waste to protect human health and the environment.
-
C.
National Ambient Air Quality Standards
The National Ambient Air Quality Standards are U.S. federal air pollution limits that set maximum allowable concentrations of key pollutants in outdoor air to protect public health and the environment.
-
D.
Great Lakes Water Quality Agreement
The Great Lakes Water Quality Agreement is a binational accord between the United States and Canada that establishes shared commitments and coordinated actions to protect and restore the water quality and ecosystem health of the Great Lakes.
-
E.
United States Environmental Protection Agency
The United States Environmental Protection Agency is a federal government agency responsible for protecting human health and the environment through regulation, enforcement, and environmental research in the United States.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
environmental regulatory program
ⓘ
permitting system ⓘ water pollution control program ⓘ |
| administeredBy | United States Environmental Protection Agency ⓘ |
| allowsDelegationTo | states ⓘ |
| appliesTo |
concentrated animal feeding operations
ⓘ
industrial facilities ⓘ municipal wastewater treatment plants ⓘ stormwater discharges ⓘ |
| authorizes | discharge of pollutants under specified conditions ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| covers |
coastal waters
ⓘ
lakes ⓘ rivers ⓘ streams ⓘ surface waters ⓘ |
| enactedInYear | 1972 ⓘ |
| enforcementBy |
United States Environmental Protection Agency
ⓘ
authorized state agencies ⓘ |
| excludes |
nonpoint source runoff
ⓘ
unconfined agricultural runoff ⓘ |
| focusesOn |
effluent quality
ⓘ
pollutant loadings ⓘ |
| geographicJurisdiction | federal ⓘ |
| goal |
to restore and maintain the biological integrity of the Nation's waters
ⓘ
to restore and maintain the chemical integrity of the Nation's waters ⓘ to restore and maintain the physical integrity of the Nation's waters ⓘ |
| implementedThrough | NPDES permits ⓘ |
| includesComponent |
construction stormwater permitting
ⓘ
industrial wastewater permitting ⓘ multi-sector general permits ⓘ municipal separate storm sewer system permitting ⓘ |
| legalBasis |
Clean Water Act
ⓘ
Clean Water Act ⓘ
surface form:
Federal Water Pollution Control Act Amendments of 1972
|
| monitors | compliance with effluent limits ⓘ |
| purpose |
to control water pollution
ⓘ
to regulate point-source discharges of pollutants ⓘ |
| regulates |
discharge of pollutants
ⓘ
discharges into waters of the United States ⓘ point sources ⓘ |
| regulatoryMechanism | permit system ⓘ |
| relatedTo |
Clean Water Act
ⓘ
surface form:
United States Clean Water Act Section 402
|
| requires |
best management practices
ⓘ
discharge permits ⓘ effluent limitations ⓘ monitoring and reporting ⓘ |
| scope | waters of the United States ⓘ |
| shortName |
National Pollutant Discharge Elimination System
self-linksurface differs
ⓘ
surface form:
NPDES
|
| typeOfPollutionControlled | water pollution ⓘ |
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: National Pollutant Discharge Elimination System Description of subject: The National Pollutant Discharge Elimination System is a U.S. regulatory permitting program that controls water pollution by regulating point-source discharges of pollutants into waters of the United States.
Referenced by (14)
Full triples — surface form annotated when it differs from this entity's canonical label.
United States Environmental Protection Agency
→
oversightOf
→
National Pollutant Discharge Elimination System
ⓘ
this entity surface form:
NPDES
National Pollutant Discharge Elimination System
→
shortName
→
National Pollutant Discharge Elimination System
self-linksurface differs
ⓘ
this entity surface form:
NPDES
subject surface form:
Clean Water Act
subject surface form:
Clean Water Act
this entity surface form:
NPDES
this entity surface form:
NPDES
this entity surface form:
Section 402 NPDES permit program
subject surface form:
Total Maximum Daily Loads program
total maximum daily loads program
→
enforcementMechanism
→
National Pollutant Discharge Elimination System
ⓘ
subject surface form:
Total Maximum Daily Loads program
this entity surface form:
NPDES permits
subject surface form:
Publicly Owned Treatment Works
this entity surface form:
National Pollutant Discharge Elimination System permit
Blue Plains Advanced Wastewater Treatment Plant
→
subjectTo
→
National Pollutant Discharge Elimination System
ⓘ
this entity surface form:
National Pollutant Discharge Elimination System permit
this entity surface form:
National Pollutant Discharge Elimination System permit