Water Nitrate

AUS-ASC-AQU-WNI General Moderate confidence

Benchmark Value

0.5 mg/L
Thresholds: Lower: —, Upper: 0.5
Direction: Lower is desirable ↓
Form: MaximumOnly

Scoring Curve

This curve shows how a field measurement for this indicator would score across all available benchmark forms in this context. The scoring engine uses 10 benchmarks together — the OptimalRange form drives the primary score, while 9 guard(s) constrain the result.

Evidence & Context

A nitrate-N concentration exceeding approximately 0.5 mg/L represents a point where the risk of significant negative ecological consequences becomes unacceptably high.

Metric Definition:

Nitrate-N concentration in water representing the upper detrimental threshold beyond which ecological harm occurs

Benchmark Definition:

This benchmark indicates the upper boundary beyond which nitrate concentrations pose significant ecological risk and degradation in alpine aquatic systems.

Justification:

Supported by evidence of eutrophication and sub-lethal toxicity impacts on aquatic fauna at concentrations above this level.

Sources (2)

Preview of Current understanding of the eutrophication process in Australia - ResearchGate, accessed August 17, 2025,
Current understanding of the eutrophication process in Australia - ResearchGate, accessed August 17, 2025, GreyLiterature

Australian and New Zealand Guidelines for Fresh and Marine Water Quality (ANZECC 2000)

View Source
Preview of Establishing riverine nutrient criteria using individual taxa thresholds, accessed August 8, 2025
Establishing riverine nutrient criteria using individual taxa thresholds, accessed August 8, 2025 Journal

Establishing riverine nutrient criteria using individual taxa thresholds - ResearchOnline@JCU, accessed July 25, 2025

View Source

Supporting Sources (42)

Additional references from the underlying research that informed this benchmark.

Preview of (PDF) Climate change impacts on Australia's alpine ecosystems - ResearchGate, accessed on May 28, 2025,
(PDF) Climate change impacts on Australia's alpine ecosystems - ResearchGate, accessed on May 28, 2025,
Contextual Support GreyLiterature

(PDF) Climate change impacts on Australia's alpine ecosystems - ResearchGate, accessed August 5, 2025

View Source
Preview of 5.7 Nitrates | Monitoring & Assessment | US EPA, accessed August 1, 2025
5.7 Nitrates | Monitoring & Assessment | US EPA, accessed August 1, 2025
Contextual Support Government

Determining safe levels of ammonia and nitrite for shrimp culture - Global Seafood Alliance, accessed August 1, 2025

View Source
Preview of Agricultural impacts on streams near Nitrate Vulnerable Zones: A case study in the Ebro basin, Northern Spain - PMC, accessed August 17, 2025,
Agricultural impacts on streams near Nitrate Vulnerable Zones: A case study in the Ebro basin, Northern Spain - PMC, accessed August 17, 2025,
Contextual Support Journal

Agricultural impacts on streams near Nitrate Vulnerable Zones: A case study in the Ebro basin, Northern Spain - PMC, accessed August 17, 2025,

View Source
Preview of ANZECC & ARMCANZ (2000) guidelines - Water Quality Australia, accessed August 12, 2025
ANZECC & ARMCANZ (2000) guidelines - Water Quality Australia, accessed August 12, 2025
Direct Evidence Government

ANZECC & ARMCANZ (2000) guidelines - Water Quality Australia

View Source
Preview of Aquaculture | Department of Natural Resources and Environment Tasmania, accessed August 17, 2025,
Aquaculture | Department of Natural Resources and Environment Tasmania, accessed August 17, 2025,
Contextual Support Government

Aquaculture | Department of Natural Resources and Environment Tasmania, accessed August 17, 2025,

View Source
Preview of Aquaculture overview transcript - VFA, accessed August 17, 2025,
Aquaculture overview transcript - VFA, accessed August 17, 2025,
Contextual Support Government

Aquaculture overview transcript - VFA, accessed August 17, 2025,

View Source
Preview of Australia's Aquaculture industry - DAFF, accessed August 17, 2025,
Australia's Aquaculture industry - DAFF, accessed August 17, 2025,
Contextual Support Government

Australian fisheries and aquaculture outlook 2024 - DAFF

View Source
Preview of Australian Alps - DCCEEW, accessed on May 31, 2025
Australian Alps - DCCEEW, accessed on May 31, 2025
Contextual Support Government

Review of water quality studies in the Australian Alps

View Source
Preview of Australian Alps - Wikipedia, accessed August 17, 2025
Australian Alps - Wikipedia, accessed August 17, 2025
Contextual Support GreyLiterature

Australian Alps - Wikipedia, accessed August 17, 2025

View Source
Preview of Australian and New Zealand Guidelines for Fresh and Marine Water Quality (2000), accessed May 11, 2025,
Australian and New Zealand Guidelines for Fresh and Marine Water Quality (2000), accessed May 11, 2025,
Direct Evidence Journal

Northern Territory Government (2020) Darwin Harbour Region Water Quality Objectives, Report Card Section 3.0.

View Source
Preview of Decades of data sustaining the Australian Alps | TERN Australia, accessed August 17, 2025,
Decades of data sustaining the Australian Alps | TERN Australia, accessed August 17, 2025,
Contextual Support Government

Decades of data sustaining the Australian Alps | TERN Australia

View Source
Preview of Full Water Quality Monitoring of a Traditional Flow-Through Rainbow Trout Farm - MDPI, accessed August 17, 2025,
Full Water Quality Monitoring of a Traditional Flow-Through Rainbow Trout Farm - MDPI, accessed August 17, 2025,
Contextual Support Journal

Full Water Quality Monitoring of a Traditional Flow-Through Rainbow Trout Farm - MDPI, accessed August 17, 2025,

View Source
Preview of Gaden Trout Hatchery - NSW Department of Primary Industries, accessed August 17, 2025,
Gaden Trout Hatchery - NSW Department of Primary Industries, accessed August 17, 2025,
Contextual Support Government

Gaden Trout Hatchery - NSW Department of Primary Industries, accessed August 17, 2025,

View Source
Preview of Gaden Trout Hatchery - Thredbo River - Visit Cooma, accessed August 17, 2025,
Gaden Trout Hatchery - Thredbo River - Visit Cooma, accessed August 17, 2025,
Contextual Support Government

Gaden Trout Hatchery - Thredbo River - Visit Cooma

View Source
Preview of Gaden Trout Hatchery EPA Pollution Monitoring Data, accessed August 17, 2025,
Gaden Trout Hatchery EPA Pollution Monitoring Data, accessed August 17, 2025,
Contextual Support Journal

Gaden Trout Hatchery EPA Pollution Monitoring Data, accessed August 17, 2025,

View Source
Preview of Gaden Trout Hatchery EPA Pollution Monitoring Data. - NSW ..., accessed August 17, 2025,
Gaden Trout Hatchery EPA Pollution Monitoring Data. - NSW ..., accessed August 17, 2025,
Contextual Support Journal

Gaden Trout Hatchery EPA Pollution Monitoring Data. - NSW ..., accessed August 17, 2025,

View Source
Preview of Impacts of Trout Culture Effluent on Water Quality and Biotic Communities in Virginia Headwater Streams | North American Journal of Aquaculture | Oxford Academic, accessed August 17, 2025,
Impacts of Trout Culture Effluent on Water Quality and Biotic Communities in Virginia Headwater Streams | North American Journal of Aquaculture | Oxford Academic, accessed August 17, 2025,
Contextual Support Journal

Impacts of Trout Culture Effluent on Water Quality and Biotic Communities in Virginia Headwater Streams | North American Journal of Aquaculture | Oxford Academic, accessed August 17, 2025,

View Source
Preview of Limiting nutrients drive mountain stream ecosystem processes along an elevation gradient | Freshwater Science: Vol 40, No 2, accessed August 17, 2025,
Limiting nutrients drive mountain stream ecosystem processes along an elevation gradient | Freshwater Science: Vol 40, No 2, accessed August 17, 2025,
Contextual Support Journal

Limiting nutrients drive mountain stream ecosystem processes along an elevation gradient | Freshwater Science: Vol 40, No 2, accessed August 17, 2025,

View Source
Preview of Living in polluted waters: A meta-analysis of the effects of nitrate and interactions with other environmental stressors on freshwater taxa - PubMed, accessed August 17, 2025,
Living in polluted waters: A meta-analysis of the effects of nitrate and interactions with other environmental stressors on freshwater taxa - PubMed, accessed August 17, 2025,
Meta Analysis Journal

Living in polluted waters: A meta-analysis of the effects of nitrate and ...

View Source
Preview of Murray2Darling basin - Wikipedia, accessed August 17, 2025
Murray2Darling basin - Wikipedia, accessed August 17, 2025
Contextual Support GreyLiterature

MurrayDarling basin - Wikipedia, accessed August 17, 2025

View Source
Preview of National Guidelines for Water Quality - Department of Natural Resources and Environment Tasmania, accessed August 1, 2025,
National Guidelines for Water Quality - Department of Natural Resources and Environment Tasmania, accessed August 1, 2025,
Contextual Support

Using the ANZECC Guidelines and Water Quality Objectives in NSW

View Source
Preview of National Water Quality Management Strategy, accessed August 17, 2025,
National Water Quality Management Strategy, accessed August 17, 2025,
Contextual Support Government

National Water Quality Management Strategy, accessed August 17, 2025,

View Source
Preview of Nature and biodiversity | Australian Alps National Parks
Nature and biodiversity | Australian Alps National Parks
Contextual Support Government

theaustralianalpsnationalparks.org, accessed on June 5, 2025

View Source
Preview of Nitrogen and Water | U.S. Geological Survey - USGS.gov, accessed August 17, 2025,
Nitrogen and Water | U.S. Geological Survey - USGS.gov, accessed August 17, 2025,
Contextual Support

Nitrogen and Water | U.S. Geological Survey - USGS.gov, accessed August 17, 2025,

View Source
Preview of Nitrogen Limitation in a Sonoran Desert Stream | Journal of the North American Benthological Society: Vol 5, No 1, accessed August 17, 2025,
Nitrogen Limitation in a Sonoran Desert Stream | Journal of the North American Benthological Society: Vol 5, No 1, accessed August 17, 2025,
Contextual Support Journal

Nitrogen Limitation in a Sonoran Desert Stream | Journal of the North American Benthological Society: Vol 5, No 1, accessed August 17, 2025,

View Source
Preview of Nutrient Criteria Technical Guidance Manual: Rivers and Streams - Environmental Protection Agency (EPA), accessed July 30, 2025
Nutrient Criteria Technical Guidance Manual: Rivers and Streams - Environmental Protection Agency (EPA), accessed July 30, 2025
Contextual Support Journal

Nutrient Criteria Technical Guidance Manual: Rivers and Streams - Environmental Protection Agency (EPA), accessed August 17, 2025,

View Source
Preview of Review of water quality studies in the Australian Alps, accessed August 17, 2025,
Review of water quality studies in the Australian Alps, accessed August 17, 2025,
Contextual Support Journal

Assessment of the Values of Kosciuszko National Park (Chapter 8)

View Source
Preview of Salmonid aquaculture sector - YouTube, accessed August 17, 2025,
Salmonid aquaculture sector - YouTube, accessed August 17, 2025,
Irrelevant

Salmonid aquaculture sector - YouTube, accessed August 17, 2025,

View Source
Preview of Snapshot of Australia's commercial fisheries and aquaculture - DAFF, accessed August 17, 2025,
Snapshot of Australia's commercial fisheries and aquaculture - DAFF, accessed August 17, 2025,
Contextual Support Government

Snapshot of Australia's commercial fisheries and aquaculture - DAFF

View Source
Preview of Snowy Lakes Trout Strategy - NSW Department of Primary Industries, accessed August 17, 2025,
Snowy Lakes Trout Strategy - NSW Department of Primary Industries, accessed August 17, 2025,
Contextual Support Government

Snowy Lakes Trout Strategy - NSW Department of Primary Industries, accessed August 17, 2025,

View Source
Preview of Snowy Mountains Trout, accessed August 17, 2025,
Snowy Mountains Trout, accessed August 17, 2025,
Irrelevant

Snowy Mountains Trout, accessed August 17, 2025,

View Source
Preview of Sources and Solutions: Agriculture | US EPA, accessed August 17, 2025,
Sources and Solutions: Agriculture | US EPA, accessed August 17, 2025,
Contextual Support Government

Sources and Solutions: Agriculture | US EPA, accessed August 17, 2025,

View Source
Preview of Sustaining the Australian Alps | TERN Australia, accessed August 17, 2025,
Sustaining the Australian Alps | TERN Australia, accessed August 17, 2025,
Contextual Support Government

Sustaining the Australian Alps | TERN Australia

View Source
Preview of The impact of nitrate pollution in waterways on freshwater species, accessed August 8, 2025
The impact of nitrate pollution in waterways on freshwater species, accessed August 8, 2025
Contextual Support Journal

The impact of nitrate pollution in waterways on freshwater species, accessed July 24, 2025,

View Source
Preview of understanding the new anzecc water quality guidelines - Environmetrics Australia, accessed May 11, 2025,
understanding the new anzecc water quality guidelines - Environmetrics Australia, accessed May 11, 2025,
Contextual Support

Australian and New Zealand Guidelines for Fresh and Marine Water Quality (2000)

View Source
Preview of Using the ANZECC Guidelines and Water Quality Objectives in NSW, accessed August 11, 2025,
Using the ANZECC Guidelines and Water Quality Objectives in NSW, accessed August 11, 2025,
Contextual Support Journal

Reference-site data - Water Quality Australia

View Source
Preview of Water monitoring - NSW Department of Primary Industries, accessed August 17, 2025,
Water monitoring - NSW Department of Primary Industries, accessed August 17, 2025,
Contextual Support Government

Water monitoring - NSW Department of Primary Industries

View Source
Preview of Water quality | Murray–Darling Basin Authority, accessed August 5, 2025
Water quality | Murray–Darling Basin Authority, accessed August 5, 2025
Contextual Support

(PDF) Water quality in two Australian dryland rivers: spatial and ..., accessed July 20, 2025,

View Source
Preview of Water Quality Guidelines Level of protection, accessed August 11, 2025,
Water Quality Guidelines Level of protection, accessed August 11, 2025,
Contextual Support Government

Water quality objectives for the Darwin Harbour Region

View Source
Preview of Water Quality Objectives - Border Rivers - NSW Government, accessed August 12, 2025
Water Quality Objectives - Border Rivers - NSW Government, accessed August 12, 2025
Contextual Support Government

(PDF) Impact of mitigated forestry activities on turbidity: assessing ...

View Source
Preview of www.environment.nsw.gov.au, accessed on May 25, 2025,
www.environment.nsw.gov.au, accessed on May 25, 2025,
Contextual Support

The Australian Alps Bioregion - Environment and Heritage, accessed on May 27, 2025,

View Source
Preview of www.rrrc.org.au, accessed May 15, 2025,
www.rrrc.org.au, accessed May 15, 2025,
Contextual Support Journal

Sediments and nutrients in north Queensland tropical streams: changes with agricultural development and pristine condition status (Technical Report No. 62, Australian Rainforest CRC, 2006)

View Source

Context

  • Region Australia
  • Biome Alpine and Subalpine Complex
  • Land Use Aquaculture
  • Assessment Not Stated
  • Evidence Type DegradationThreshold

Lifecycle

  • Status Active
  • Version 3
  • Effective From 2 Jun 2026

Notes

Exceeding this threshold signals urgent management intervention is required. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.