Water Nitrate

AUS-TSW-CON-WNI General Moderate confidence

Benchmark Value

11.5 mg/L

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 5 benchmarks together — the OptimalRange form drives the primary score, while 4 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary MaximumOnly Guard MaximumOnly Guard MaximumOnly Guard Point Guard

Evidence & Context

The upper detrimental threshold for water nitrate in this context is 11.5 mg/L as NO3−. Concentrations exceeding this value indicate a significant departure from the best available natural condition and a transition to a disturbed state with an unacceptable risk of ecological harm.

Metric Definition:

Upper detrimental threshold concentration of water nitrate above which ecological harm and disturbance occur in conservation areas of the Temperate Semi-Arid Shrublands & Open Woodlands biome.

Benchmark Definition:

This benchmark marks the upper detrimental threshold for water nitrate concentration in conservation areas of the Temperate Semi-Arid Shrublands & Open Woodlands biome, beyond which ecological harm and disturbance are likely.

Justification:

This threshold is based on the 95% species protection level from the ANZG 2025 framework, representing the point where ecological risk becomes unacceptable for conservation areas.

Sources (1)

Preview of Nitrate in freshwater, toxicant default guideline values for protecting ..., accessed August 8, 2025

Nitrate in freshwater, toxicant default guideline values for protecting ..., accessed August 8, 2025 Government

Nitrate in freshwater, toxicant default guideline values for protecting aquatic ecosystems, technical brief

Supporting Sources (43)

Additional references from the underlying research that informed this benchmark.

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

(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

Case studies - Water Sensitive SA

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

(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

An environmental flow to an ephemeral creek increases the input of carbon and nutrients to a downstream receiving river - Frontiers, accessed July 26, 2025,

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

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

Contextual Support GreyLiterature

The IBRA subregions occurring in the Great Western Woodlands. The map... | Download Scientific Diagram - ResearchGate

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

Establishing closure targets for discharge to temporary waters — a review - Australian Centre for Geomechanics

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,

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

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)

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

How should we manage our soils to increase soil carbon?, accessed May 10, 2026

Preview of Bioregions and EVC benchmarks - Environment, accessed August 5, 2025,

Bioregions and EVC benchmarks - Environment, accessed August 5, 2025,

Contextual Support Government

TASVEG VCA Manual: A manual for assessing vegetation condition in Tasmania, Version 2.0. Natural and Cultural Heritage, Department of

Preview of Case Study 2 The Murray-Darling Basin – an ecological and human tragedy, accessed July 13, 2025,

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,

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

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)

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

How Past Rainfall Shapes Australia's Dryland Ecosystems - Western Sydney University

Preview of Characterising the relationship between water quality and water quantity, accessed August 5, 2025

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

Contextual Support Journal

Turbidity | Australia state of the environment 2021

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

Approved Conservation Advice for the Buloke ... - DCCEEW, accessed July 15, 2025

Preview of Coolgardie woodlands - Wikipedia, accessed July 13, 2025

Coolgardie woodlands - Wikipedia, accessed July 13, 2025

Contextual Support GreyLiterature

Salinity - Murray�Darling Basin Authority

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

East Australian Mediterranean Woodlands & Temperate Savannas ..., accessed July 15, 2025

Contextual Support

Plants of the mallee shrublands - Australian National Botanic Gardens, accessed July 13, 2025

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 Government

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

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

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,

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,

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,

Preview of Mallee bioregion - Wikipedia

Mallee bioregion - Wikipedia

Contextual Support GreyLiterature

FARM DAMS – A GUIDE TO SITING, DESIGN, CONSTRUCTION AND MANAGEMENT ON EYRE PENINSULA - Sheep Connect SA

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,

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,

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

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,

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,

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

Australian and New Zealand Guidelines for Fresh and Marine Water Quality (ANZG 2018)

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

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,

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,

Preview of Nitrate, accessed July 16, 2025,

Nitrate, accessed July 16, 2025,

Contextual Support Journal

Nitrate, accessed July 16, 2025,

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

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

Contextual Support GreyLiterature

An environmental flow to an ephemeral creek increases the input of carbon and nutrients to a downstream receiving river, accessed July 26, 2025,

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 14 – Mallee woodlands and shrublands - DCCEEW, accessed August 28, 2025

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

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,

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 Murray2Darling Basin, Australia - MDPI, accessed July 28, 2025

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

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

Semi-arid woodlands (grassy sub-formation) | NSW Environment, Energy and Science

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

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,

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,

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,

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

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

Direct Evidence Journal

Nitrate in freshwater, toxicant default guideline values for protecting aquatic ecosystems

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

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

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

Woodlands - DCCEEW, accessed August 5, 2025,

Contextual Support Government

Woodlands - DCCEEW, accessed August 4, 2025,

Context

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

Lifecycle

Status Active
Version 2
Effective From 2 Jun 2026

Notes

Exceeding this nitrate concentration indicates a transition from a high conservation value state to a disturbed state with risks of eutrophication and toxic effects on sensitive aquatic life.

Related Benchmarks

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