Water Nitrate

AUS-TSW-CON-WNI General Moderate confidence

Benchmark Value

0.01 mg/L
Direction: Higher is desirable ↑
Form: MinimumOnly

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 6 benchmarks together — the OptimalRange form drives the primary score, while 5 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary MaximumOnly Guard MinimumOnly Guard Point Guard MaximumOnly Guard Point Guard

Evidence & Context

A lower critical threshold is not ecologically relevant for these naturally nutrient-poor (oligotrophic) systems. The optimal low-end condition is the natural background concentration, which is at or near the analytical detection limit (e.g., <0.01 mg/L). Any increase from this baseline indicates an external nutrient input and a departure from the reference state.

Metric Definition:

Natural background concentration of nitrate representing the optimal low-end condition in oligotrophic systems.

Benchmark Definition:

This benchmark represents the natural baseline nitrate concentration near the detection limit in conservation areas of the Temperate Semi-Arid Shrublands & Open Woodlands biome in Australia.

Justification:

Ecological rationale that no lower threshold exists due to natural nutrient scarcity; baseline near detection limit is optimal.

Sources (1)

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Toxicant default guideline values for aquatic ecosystem protection ..., accessed August 8, 2025 Journal

Toxicant default guideline values for aquatic ecosystem protection ...

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Supporting Sources (42)

Additional references from the underlying research that informed this benchmark.

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(PDF) Eutrophication in Australian Rivers, Reservoirs and Estuaries  A Southern Hemisphere Perspective on the Science and its Implications - ResearchGate, accessed May 10, 2025,
Contextual Support Journal

(PDF) Eutrophication in Australian Rivers, Reservoirs and Estuaries – A Southern Hemisphere Perspective on the Science and its Implications - ResearchGate, accessed July 13, 2025,

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(PDF) Nutrient limitations to aquatic production along an alluvial groundwater connectivity gradient in semi-arid northwest Australia - ResearchGate, accessed July 26, 2025,
Contextual Support GreyLiterature

(PDF) Nutrient limitations to aquatic production along an alluvial groundwater connectivity gradient in semi-arid northwest Australia - ResearchGate, accessed July 16, 2025,

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4 The IBRA subregions occurring in the Great Western Woodlands. The map... | Download Scientific Diagram - ResearchGate, accessed July 8, 2025
Contextual Support GreyLiterature

4 The IBRA subregions occurring in the Great Western Woodlands. The map... | Download Scientific Diagram - ResearchGate, accessed July 16, 2025,

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Preview of An environmental flow to an ephemeral creek increases the input of carbon and nutrients to a downstream receiving river, accessed July 27, 2025,
An environmental flow to an ephemeral creek increases the input of carbon and nutrients to a downstream receiving river, accessed July 27, 2025,
Contextual Support

River Health in the Flinders Ranges - EPA SA, accessed August 1, 2025

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Preview of An Interim Biogeographic Regionalisation for Australia, accessed July 16, 2025,
An Interim Biogeographic Regionalisation for Australia, accessed July 16, 2025,
Contextual Support Journal

An Interim Biogeographic Regionalisation for Australia, accessed July 16, 2025,

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Preview of ANZEC Guidelines - Risk Assessment for Contaminated Sites in New Zealand, accessed July 18, 2025,
ANZEC Guidelines - Risk Assessment for Contaminated Sites in New Zealand, accessed July 18, 2025,
Regulatory Framework Government

Salinity - Murray–Darling Basin Authority, accessed July 31, 2025,

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Preview of Australia's bioregions (IBRA) - DCCEEW, accessed July 15, 2025
Australia's bioregions (IBRA) - DCCEEW, accessed July 15, 2025
Contextual Support

Interim Biogeographic Regionalisation for Australia (IBRA), Version 7 (Regions), accessed July 12, 2025,

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Preview of Australian dryland soils are acidic and nutrient-depleted, and have unique microbial communities compared with other drylands - PMC, accessed August 5, 2025,
Australian dryland soils are acidic and nutrient-depleted, and have unique microbial communities compared with other drylands - PMC, accessed August 5, 2025,
Contextual Support Journal

Root Structure and Functioning for Efficient Acquisition of Phosphorus: Matching Morphological and Physiological Traits

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Bioregions and EVC benchmarks - Environment, accessed August 5, 2025,
Contextual Support Government

Eastern NSW Plant Community Type Percentage Cleared Calculation Technical Notes - Environment and Heritage

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Case Study 2 The Murray-Darling Basin – an ecological and human tragedy, accessed July 13, 2025,
Contextual Support Journal

Case Study 2 The Murray-Darling Basin – an ecological and human tragedy, accessed July 16, 2025,

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Preview of Challenges and adaptation needs for water quality in the Murray-Darling Basin in response to climate change - Australian Academy of Technological Sciences and Engineering (ATSE), accessed July 21, 2025
Challenges and adaptation needs for water quality in the Murray-Darling Basin in response to climate change - Australian Academy of Technological Sciences and Engineering (ATSE), accessed July 21, 2025
Contextual Support Journal

Salinity - Murray–Darling Basin Authority

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Preview of Chapter 9 AUSTRALIAN GRASSLANDS - Food and Agriculture Organization of the United Nations, accessed August 5, 2025,
Chapter 9 AUSTRALIAN GRASSLANDS - Food and Agriculture Organization of the United Nations, accessed August 5, 2025,
Contextual Support Government

Karst and agriculture in Australia - Digital Commons @ USF, accessed July 26, 2025,

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Characterising the relationship between water quality and water quantity, accessed August 5, 2025
Contextual Support Journal

Report Card 2022-23 - EPA Victoria

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Preview of Conservation Advice1 for the Plains mallee box woodlands of the Murray Darling Depression, Riverina and Naracoorte Coastal Plain, accessed July 15, 2025
Conservation Advice1 for the Plains mallee box woodlands of the Murray Darling Depression, Riverina and Naracoorte Coastal Plain, accessed July 15, 2025
Contextual Support Journal

Conservation Advice1 for the Plains mallee box woodlands of the Murray Darling Depression, Riverina and Naracoorte Coastal Plain, accessed July 16, 2025,

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Preview of Coolgardie woodlands - Wikipedia, accessed July 13, 2025
Coolgardie woodlands - Wikipedia, accessed July 13, 2025
Contextual Support GreyLiterature

Salinity - Murray–Darling Basin Authority

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Preview of East Australian Mediterranean Woodlands & Temperate Savannas ..., accessed July 15, 2025
East Australian Mediterranean Woodlands & Temperate Savannas ..., accessed July 15, 2025
Contextual Support

Temperate Grasslands - Greening Australia

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Preview of Great Western Woodlands SuperSite | Climate Change Impacts - TERN Australia, accessed July 10, 2025,
Great Western Woodlands SuperSite | Climate Change Impacts - TERN Australia, accessed July 10, 2025,
Contextual Support GreyLiterature

URBAN FOREST STRATEGY - Your Say South Perth, accessed July 13, 2025

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Preview of Interim Biogeographic Regionalisation for Australia - Wikipedia, accessed July 13, 2025,
Interim Biogeographic Regionalisation for Australia - Wikipedia, accessed July 13, 2025,
Contextual Support GreyLiterature

Category:IBRA regions - Wikipedia, accessed August 1, 2025

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Preview of Johnsons and Chaffey Bend, Mallee Catchment Management Authority, Mildura, Victoria, accessed July 16, 2025,
Johnsons and Chaffey Bend, Mallee Catchment Management Authority, Mildura, Victoria, accessed July 16, 2025,
Contextual Support Journal

Johnsons and Chaffey Bend, Mallee Catchment Management Authority, Mildura, Victoria, accessed July 16, 2025,

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Preview of Land use as a major factor of riverine nitrate in a semi-arid farming-pastoral ecotone: New insights from multiple environmental tracers and molecular signatures of DOM - Frontiers, accessed July 16, 2025,
Land use as a major factor of riverine nitrate in a semi-arid farming-pastoral ecotone: New insights from multiple environmental tracers and molecular signatures of DOM - Frontiers, accessed July 16, 2025,
Contextual Support Journal

Land use as a major factor of riverine nitrate in a semi-arid farming-pastoral ecotone: New insights from multiple environmental tracers and molecular signatures of DOM - Frontiers, accessed July 16, 2025,

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Preview of Mallee 2 (MAL2 - Western Mallee subregion) - DBCA Library, accessed July 16, 2025,
Mallee 2 (MAL2 - Western Mallee subregion) - DBCA Library, accessed July 16, 2025,
Contextual Support Journal

Mallee 2 (MAL2 - Western Mallee subregion) - DBCA Library, accessed July 16, 2025,

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Preview of Mallee bioregion - Wikipedia
Mallee bioregion - Wikipedia
Contextual Support GreyLiterature

Great Western Woodlands - Wikipedia, accessed July 15, 2025,

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Preview of Mallee region - Water and catchments, accessed July 16, 2025,
Mallee region - Water and catchments, accessed July 16, 2025,
Contextual Support Journal

Mallee region - Water and catchments, accessed July 16, 2025,

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Preview of Methods - Northland Regional Council, accessed July 16, 2025,
Methods - Northland Regional Council, accessed July 16, 2025,
Methodology Source Government

Methods - Northland Regional Council, accessed July 16, 2025,

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Multiple adaptive responses of Australian native perennial legumes with pasture potential to grow in phosphorus- and moisture-limited environments, accessed August 11, 2025,
Contextual Support Journal

Multiple adaptive responses of Australian native perennial legumes with pasture potential to grow in phosphorus- and moisture-limited environments, accessed July 16, 2025,

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Preview of Murray–Darling Depression bioregion - DCCEEW, accessed July 16, 2025,
Murray–Darling Depression bioregion - DCCEEW, accessed July 16, 2025,
Contextual Support Journal

Murray–Darling Depression bioregion - DCCEEW, accessed July 16, 2025,

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Preview of Nitrate and nitrite | Australian Drinking Water Guidelines - NHMRC, accessed August 8, 2025
Nitrate and nitrite | Australian Drinking Water Guidelines - NHMRC, accessed August 8, 2025
Contextual Support Government

Water quality guidelines - Queensland Environment Department, accessed July 31, 2025,

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Nitrate and nitrite in Drinking-water - World Health Organization (WHO), accessed July 16, 2025,
Contextual Support Journal

Nitrate and nitrite in Drinking-water - World Health Organization (WHO), accessed July 16, 2025,

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Preview of Nitrate Toxicity to Aquatic Animals: A Review With New Data for Freshwater Invertebrates, accessed July 16, 2025,
Nitrate Toxicity to Aquatic Animals: A Review With New Data for Freshwater Invertebrates, accessed July 16, 2025,
Contextual Support Journal

Nitrate Toxicity to Aquatic Animals: A Review With New Data for Freshwater Invertebrates, accessed July 13, 2025,

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Preview of Nitrate, accessed July 16, 2025,
Nitrate, accessed July 16, 2025,
Contextual Support Journal

Nitrate, accessed July 16, 2025,

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Nutrient and Organic Matter Dynamics in Intermittent Rivers and Ephemeral Streams | Request PDF - ResearchGate, accessed July 21, 2025
Contextual Support GreyLiterature

Nutrient and Organic Matter Dynamics in Intermittent Rivers and Ephemeral Streams | Request PDF - ResearchGate, accessed July 16, 2025,

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Preview of NVIS Fact sheet MVG 14 – Mallee woodlands and shrublands - DCCEEW, accessed July 15, 2025
NVIS Fact sheet MVG 14 – Mallee woodlands and shrublands - DCCEEW, accessed July 15, 2025
Contextual Support Journal

NVIS Fact sheet MVG 19 – Tussock grasslands, accessed August 28, 2025

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Preview of Plant and soil carbon, nitrogen and phosphorus on the Australian continent - CiteSeerX, accessed July 16, 2025,
Plant and soil carbon, nitrogen and phosphorus on the Australian continent - CiteSeerX, accessed July 16, 2025,
Contextual Support GreyLiterature

Soil phosphorus testing: Colwell P and DGT-P - WA Soil Knowledge Base

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Preview of Release of PFOS Default Guideline Values - ACLCA, accessed July 16, 2025,
Release of PFOS Default Guideline Values - ACLCA, accessed July 16, 2025,
Irrelevant

Release of PFOS Default Guideline Values - ACLCA, accessed July 16, 2025,

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Preview of Salinity Management in the Murray–Darling Basin, Australia - MDPI, accessed July 16, 2025,
Salinity Management in the Murray–Darling Basin, Australia - MDPI, accessed July 16, 2025,
Contextual Support Journal

Salinity Management in the Murray13Darling Basin, Australia - MDPI, accessed July 28, 2025

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Preview of Semi-arid woodlands (grassy sub-formation) | NSW Environment, Energy and Science, accessed July 12, 2025, )
Semi-arid woodlands (grassy sub-formation) | NSW Environment, Energy and Science, accessed July 12, 2025, )
Contextual Support Government

Temperate Grasslands - Greening Australia

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Preview of Semi-arid woodlands (shrubby sub-formation) | NSW Environment, Energy and Science, accessed July 12, 2025, )
Semi-arid woodlands (shrubby sub-formation) | NSW Environment, Energy and Science, accessed July 12, 2025, )
Contextual Support Government

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Stream Dissolved Nitrogen Cycling Responds to Human Activity across the Landscape, accessed July 16, 2025,
Contextual Support GreyLiterature

Stream Dissolved Nitrogen Cycling Responds to Human Activity across the Landscape, accessed July 16, 2025,

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Preview of The Riverina Bioregion - Environment and Heritage, accessed July 16, 2025,
The Riverina Bioregion - Environment and Heritage, accessed July 16, 2025,
Contextual Support

The Riverina Bioregion - Environment and Heritage, accessed July 16, 2025,

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Preview of Threats - EPA SA, accessed July 16, 2025,
Threats - EPA SA, accessed July 16, 2025,
Contextual Support Government

Threats - EPA SA, accessed July 13, 2025,

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Preview of Water Quality Objectives - Border Rivers - NSW Government, accessed August 12, 2025
Water Quality Objectives - Border Rivers - NSW Government, accessed August 12, 2025
Regulatory Framework Government

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Preview of Woodlands - DCCEEW, accessed August 5, 2025,
Woodlands - DCCEEW, accessed August 5, 2025,
Contextual Support

Woodlands - DCCEEW, accessed May 19, 2025

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Context

  • Region Australia
  • Biome Temperate Semi-Arid Shrublands & Open Woodlands
  • Land Use Conservation / Protected Natural Areas
  • Assessment Conservation Target
  • Evidence Type ReferenceCondition

Lifecycle

  • Status Active
  • Version 2
  • Effective From 16 Mar 2026

Notes

Any measurable increase above this baseline indicates external nutrient input and departure from reference condition.

Related Benchmarks

Other benchmarks in the AUS-TSW-CON-WNI family.

4.4 mg/L Moderate
Conservation / Protected Natural Areas · Conservation Target
MaximumOnly Active v1
11.5 mg/L Moderate
Conservation / Protected Natural Areas · Conservation Target
MinimumOnly Superseded v1