Water Nitrate

AUS-TSW-AGR-WNI General Moderate confidence

Benchmark Value

4.4 mg/L
Thresholds: Lower: —, Upper: 4.4
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 Point Guard Point Guard MaximumOnly Guard

Evidence & Context

The upper detrimental threshold is set at 1.0 mg/L NO3​−N, converted to 4.4 mg/L NO3​.

Metric Definition:

Upper detrimental threshold for nitrate concentration in water indicating ecological harm.

Benchmark Definition:

This benchmark defines the upper nitrate concentration threshold beyond which aquatic ecosystems in the biome are likely to experience significant ecological harm.

Justification:

Based on modern ecotoxicology guidelines protecting 95% of freshwater species from chronic toxicity.

Sources (1)

Preview of Nitrate in United Kingdom Rivers: Policy and Its Outcomes Since 1970 - ACS Publications, accessed August 5, 2025
Nitrate in United Kingdom Rivers: Policy and Its Outcomes Since 1970 - ACS Publications, accessed August 5, 2025

Toxicant default guideline values for aquatic ecosystem protection: Nitrate in freshwater - Water Quality Australia

View Source

Supporting Sources (45)

Additional references from the underlying research that informed this benchmark.

Preview of (PDF) An Assessment of the Economic Impacts of NSW Agriculture Research and Extension: Conservation Farming and Reduced Tillage in Northern NSW - ResearchGate
(PDF) An Assessment of the Economic Impacts of NSW Agriculture Research and Extension: Conservation Farming and Reduced Tillage in Northern NSW - ResearchGate
Contextual Support

(PDF) An Assessment of the Economic Impacts of NSW Agriculture Research and Extension: Conservation Farming and Reduced Tillage in Northern NSW - ResearchGate

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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,

View Source
Preview of (PDF) When do cover crops reduce nitrate leaching? A global meta‐analysis
(PDF) When do cover crops reduce nitrate leaching? A global meta‐analysis
Meta Analysis Journal

(PDF) When do cover crops reduce nitrate leaching? A global meta‐analysis, accessed on May 31, 2025

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Preview of A Biodiverse Land | Western Australian Museum
A Biodiverse Land | Western Australian Museum
Contextual Support Government

Invasive species, problematic native species, and diseases | Australia state of the environment 2021, accessed July 13, 2025

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Preview of A critical review of paired catchment studies with reference to seasonal flows and climatic variability - eWater
A critical review of paired catchment studies with reference to seasonal flows and climatic variability - eWater
Contextual Support Journal

A critical review of paired catchment studies with reference to seasonal flows and climatic variability - eWater

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A GUIDE TO THE APPLICATION OF THE ANZECC ... - ResearchGate, accessed August 11, 2025,
Contextual Support GreyLiterature

Namoi River Water Quality Objectives explained - NSW Government

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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,
Contextual Support Government

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

View Source
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Approved Conservation Advice for the White Box - Yellow Box - Blakely's Red Gum Grassy Woodland and Derived Native Grassland - DCCEEW, accessed August 12, 2025,
Contextual Support Journal

Conservation Advice for Lowland Grassy Woodland in the South East Corner Bioregion, accessed August 6, 2025

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Preview of Australia state of the environment 2021: land, accessed May 11, 2025
Australia state of the environment 2021: land, accessed May 11, 2025
Contextual Support Journal

Management Standards and Procedures for timber harvesting operations in Victoria’s State forests

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Preview of Australian and New Zealand Guidelines for Fresh and Marine Water Quality (2000) - Volume 3 - Chapter 9 - Primary Industries
Australian and New Zealand Guidelines for Fresh and Marine Water Quality (2000) - Volume 3 - Chapter 9 - Primary Industries
Contextual Support Journal

Australian and New Zealand Guidelines for Fresh and Marine Water Quality (2000) - Volume 3 - Chapter 9 - Primary Industries

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Preview of Challenges and adaptation needs for water quality in the Murray-Darling Basin in response to climate change - UNSW Sydney, accessed August 10, 2025
Challenges and adaptation needs for water quality in the Murray-Darling Basin in response to climate change - UNSW Sydney, accessed August 10, 2025
Contextual Support Journal

Challenges and adaptation needs for water quality in the ... - UNSW

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Preview of communities.unep.org, accessed May 15, 2025,
communities.unep.org, accessed May 15, 2025,
Direct Evidence

Australian and New Zealand guidelines for fresh and marine water quality

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Preview of Cover Crops and Nitrate Leaching - Agriculture Water Quality
Cover Crops and Nitrate Leaching - Agriculture Water Quality
Contextual Support GreyLiterature

Cover Crops and Nitrate Leaching - Agriculture Water Quality

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Preview of Development of regional water quality and catchment guidelines for the conservation of aquatic ecosystems - NSW Environment Protection Authority, accessed July 30, 2025,
Development of regional water quality and catchment guidelines for the conservation of aquatic ecosystems - NSW Environment Protection Authority, accessed July 30, 2025,
Contextual Support Journal

Defining reference condition for South Australian streams ... - EPA SA, accessed August 3, 2025

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Preview of Enhancing sustainable crop production through integrated nutrient management: a focus on vermicompost, bio-enriched rock phosphate, and inorganic fertilisers – a systematic review - Frontiers
Enhancing sustainable crop production through integrated nutrient management: a focus on vermicompost, bio-enriched rock phosphate, and inorganic fertilisers – a systematic review - Frontiers
Contextual Support Journal

Enhancing sustainable crop production through integrated nutrient management: a focus on vermicompost, bio-enriched rock phosphate, and inorganic fertilisers – a systematic review - Frontiers

View Source
Preview of Eutrophication - Wikipedia
Eutrophication - Wikipedia
Contextual Support

Eutrophication - Wikipedia

Preview of Eyre Peninsula Landscape Regional Summary 2020 Aquatic ...
Eyre Peninsula Landscape Regional Summary 2020 Aquatic ...
Contextual Support Government

Eyre Peninsula Landscape Regional Summary 2020 Aquatic ...

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Preview of Farming systems can affect soil biology, soil pathogens and system resilience - GRDC
Farming systems can affect soil biology, soil pathogens and system resilience - GRDC
Contextual Support GreyLiterature

Beyond Bacteria: The Importance of Fungi, Protozoa and Nematodes in Soil Microbiology, accessed July 27, 2025,

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Preview of forty-five years of paired catchment monitoring in the Brigalow Belt of Australia
forty-five years of paired catchment monitoring in the Brigalow Belt of Australia
Contextual Support Journal

forty-five years of paired catchment monitoring in the Brigalow Belt of Australia

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Preview of Full article: Effects of land use on water quality at different spatial scales in the middle reaches of Huaihe River - Taylor & Francis Online
Full article: Effects of land use on water quality at different spatial scales in the middle reaches of Huaihe River - Taylor & Francis Online
Contextual Support

Full article: Effects of land use on water quality at different spatial scales in the middle reaches of Huaihe River - Taylor & Francis Online

View Source
Preview of Full article: Reference conditions and threshold values for nitrate-nitrogen in New Zealand groundwaters - Taylor & Francis Online
Full article: Reference conditions and threshold values for nitrate-nitrogen in New Zealand groundwaters - Taylor & Francis Online
Contextual Support

Full article: Reference conditions and threshold values for nitrate-nitrogen in New Zealand groundwaters - Taylor & Francis Online, accessed August 1, 2025

View Source
Preview of Great Western Woodlands - Wikipedia, accessed July 10, 2025,
Great Western Woodlands - Wikipedia, accessed July 10, 2025,
Contextual Support GreyLiterature

Great Western Woodlands - Wikipedia, accessed July 12, 2025,

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Preview of Great Western Woodlands (58) - Australian Acoustic Observatory
Great Western Woodlands (58) - Australian Acoustic Observatory
Contextual Support GreyLiterature

Great Western Woodlands (58) - Australian Acoustic Observatory

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Preview of Harmful algal bloom - Wikipedia
Harmful algal bloom - Wikipedia
Contextual Support GreyLiterature

Harmful algal bloom - Wikipedia

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Preview of Integrated Nutrient Management Enhances Soil Quality and Crop Productivity in Maize-Based Cropping System - MDPI
Integrated Nutrient Management Enhances Soil Quality and Crop Productivity in Maize-Based Cropping System - MDPI
Contextual Support Journal

Integrated Nutrient Management Enhances Soil Quality and Crop Productivity in Maize-Based Cropping System - MDPI

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Preview of Integrated Nutrient Management: A Long-term Approach towards Sustainability
Integrated Nutrient Management: A Long-term Approach towards Sustainability
Contextual Support Journal

Integrated Nutrient Management: A Long-term Approach towards Sustainability

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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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Preview of Nitrogen fertilisers — improving efficiency and saving money - Agriculture Victoria
Nitrogen fertilisers — improving efficiency and saving money - Agriculture Victoria
Contextual Support Government

Nitrogen fertilisers — improving efficiency and saving money - Agriculture Victoria

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Preview of NVIS Fact sheet MVG 13 – Acacia open woodlands - DCCEEW, accessed July 13, 2025,
NVIS Fact sheet MVG 13 – Acacia open woodlands - DCCEEW, accessed July 13, 2025,
Contextual Support Journal

NVIS Fact sheet MVG 13  Acacia open woodlands - DCCEEW, accessed July 10, 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 Predicting Shifts in Australian Shrublands with Changing Climates and Land Uses - USDA Forest Service
Predicting Shifts in Australian Shrublands with Changing Climates and Land Uses - USDA Forest Service
Contextual Support

Predicting Shifts in Australian Shrublands with Changing Climates and Land Uses - USDA Forest Service

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Preview of Project Updates – Mixed Cover Crops for Sustainable Farming - CSIRO Research
Project Updates – Mixed Cover Crops for Sustainable Farming - CSIRO Research
Contextual Support Government

Stubble Retention in Cropping Systems in Southern Australia: Benefits and Challenges - Charles Sturt University, accessed July 8, 2025,

View Source
Preview of Regenerative Agriculture—A Literature Review on the Practices and Mechanisms Used to Improve Soil Health - MDPI, accessed August 5, 2025,
Regenerative Agriculture—A Literature Review on the Practices and Mechanisms Used to Improve Soil Health - MDPI, accessed August 5, 2025,
Contextual Support Journal

Regenerative Agriculture—A Literature Review on the Practices and Mechanisms Used to Improve Soil Health - MDPI, accessed August 28, 2025,

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Preview of Role of soil drying in nitrogen mineralization and microbial community function in semi-arid grasslands of North-West Australia | Request PDF - ResearchGate
Role of soil drying in nitrogen mineralization and microbial community function in semi-arid grasslands of North-West Australia | Request PDF - ResearchGate
Contextual Support

Microbial impact on initial soil formation in arid and semiarid environments under simulated climate change - Frontiers, accessed July 28, 2025

View Source
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, accessed July 12, 2025, )

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Preview of Soil biodiversity - Wikipedia
Soil biodiversity - Wikipedia
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Soil biodiversity - Wikipedia, accessed July 8, 2025

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Preview of Southeast Australia temperate savanna - Wikipedia, accessed August 4, 2025
Southeast Australia temperate savanna - Wikipedia, accessed August 4, 2025
Contextual Support

Southeast Australia temperate savanna - Wikipedia

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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
Direct Evidence Journal

Toxicant default guideline values for aquatic ecosystem protection ...

View Source
Preview of The role of cover crops in reducing nitrate leaching and increasing soil organic matter - CABI Digital Library
The role of cover crops in reducing nitrate leaching and increasing soil organic matter - CABI Digital Library
Contextual Support GreyLiterature

The role of cover crops in reducing nitrate leaching and increasing soil organic matter - CABI Digital Library

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Preview of The water quality and economic benefits of agricultural management practices, accessed August 5, 2025
The water quality and economic benefits of agricultural management practices, accessed August 5, 2025
Contextual Support Journal

Protecting farm waterways | Dairy News Australia

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Preview of Water Assessment Water Quality Report Series
Water Assessment Water Quality Report Series
Contextual Support

Water Assessment Water Quality Report Series, accessed August 11, 2025

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Preview of Water quality in the Murray–Darling Basin: The potential impacts of climate change, accessed August 12, 2025
Water quality in the Murray–Darling Basin: The potential impacts of climate change, accessed August 12, 2025
Contextual Support

Water quality in the Murray–Darling Basin: The potential impacts of climate change

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Preview of Water quality threats | Murray–Darling Basin Authority
Water quality threats | Murray–Darling Basin Authority
Contextual Support Government

Water quality threats | Murray–Darling Basin Authority

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Preview of What's wrong with the Australian River Assessment System (AUSRIVAS)? - CSIRO PUBLISHING | Marine and Freshwater Research
What's wrong with the Australian River Assessment System (AUSRIVAS)? - CSIRO PUBLISHING | Marine and Freshwater Research
Contextual Support Journal

What's wrong with the Australian River Assessment System (AUSRIVAS)? - CSIRO PUBLISHING | Marine and Freshwater Research

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Preview of Woodlands - DCCEEW
Woodlands - DCCEEW
Contextual Support

Woodlands - DCCEEW

Context

  • Region Australia
  • Biome Temperate Semi-Arid Shrublands & Open Woodlands
  • Land Use Agricultural Crop Production
  • Assessment Pristine Reference
  • Evidence Type DegradationThreshold

Lifecycle

  • Status Active
  • Version 1
  • Effective From 20 Mar 2026

Notes

Exceeding this threshold indicates a degraded aquatic ecosystem with risk of toxicity and eutrophication.

Related Benchmarks

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

0.177 mg/L Moderate
Agricultural Crop Production · Agricultural Biodiversity Target
Point Active v1
4.4 mg/L Low
Agricultural Crop Production · Pristine Reference
Point Active v1