Water Nitrate

AUS-TGP-AGR-WNI General Moderate confidence

Benchmark Value

1.1 mg/L
Thresholds: Lower: —, Upper: 1.1
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

For a system aiming for high ecological health, the DGV for 99% species protection, which is 1.1 mg/L as NO3−​, serves as a clear, scientifically defensible upper detrimental threshold.

Metric Definition:

Default Guideline Value (DGV) for nitrate protecting 99% of aquatic species

Benchmark Definition:

This benchmark defines the upper detrimental threshold for nitrate concentration in freshwater to protect 99% of aquatic species in the Temperate Grassy Woodlands & Plains biome of Australia.

Justification:

Exceeding this value indicates a direct toxic risk to the most sensitive 1% of species and signifies a significant departure from a healthy state.

Sources (1)

Preview of Nitrate in freshwater, toxicant default guideline values for protecting aquatic ecosystems, accessed August 5, 2025
Nitrate in freshwater, toxicant default guideline values for protecting aquatic ecosystems, accessed August 5, 2025 Journal

Toxicant default guideline values for aquatic ecosystem protection ..., accessed August 1, 2025

View Source

Supporting Sources (31)

Additional references from the underlying research that informed this benchmark.

Preview of (PDF) A review of sediment and nutrient concentration data from ..., accessed August 5, 2025
(PDF) A review of sediment and nutrient concentration data from ..., accessed August 5, 2025
Contextual Support

(PDF) A review of sediment and nutrient concentration data from Australia for use in catchment water quality models - ResearchGate, accessed August 10, 2025,

View Source
Preview of (PDF) Nutrients and Primary Production in the Flinders River - ResearchGate, accessed August 5, 2025
(PDF) Nutrients and Primary Production in the Flinders River - ResearchGate, accessed August 5, 2025
Contextual Support

(PDF) Nutrients and Primary Production in the Flinders River - ResearchGate

View Source
Preview of A Compendium of Ecological Information on Australia's Northern Tropical Rivers - Report 5 - Water quality - DCCEEW, accessed August 1, 2025,
A Compendium of Ecological Information on Australia's Northern Tropical Rivers - Report 5 - Water quality - DCCEEW, accessed August 1, 2025,
Contextual Support Journal

Threshold Indicator Taxa ANalysis and change points (dots) for the ...

View Source
Preview of Assessment of the Decadal Impact of Wildfire on Water Quality in Forested Catchments, accessed August 5, 2025
Assessment of the Decadal Impact of Wildfire on Water Quality in Forested Catchments, accessed August 5, 2025
Contextual Support

Assessment of the Decadal Impact of Wildfire on Water Quality in Forested Catchments

View Source
Preview of Australian Journal of Soil Research - CSIRO Publishing, accessed August 5, 2025
Australian Journal of Soil Research - CSIRO Publishing, accessed August 5, 2025
Contextual Support

Australian Journal of Soil Research - CSIRO Publishing, accessed July 28, 2025,

View Source
Preview of BioCondition: A condition assessment framework for terrestrial biodiversity in Queensland, accessed August 5, 2025
BioCondition: A condition assessment framework for terrestrial biodiversity in Queensland, accessed August 5, 2025
Contextual Support Journal

BioMetric: Vegetation condition benchmarks, short-term review, accessed August 12, 2025,

View Source
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

Report Card 2022-23 - EPA Victoria

View Source
Preview of Cover crop selection and management to reduce nitrate leaching risk, accessed August 5, 2025
Cover crop selection and management to reduce nitrate leaching risk, accessed August 5, 2025
Contextual Support

Cover crop selection and management to reduce nitrate leaching risk

View Source
Preview of Cover Crops and Fertilization Alter Nitrogen Loss in Organic and Conventional Conservation Agriculture Systems - Frontiers, accessed August 5, 2025
Cover Crops and Fertilization Alter Nitrogen Loss in Organic and Conventional Conservation Agriculture Systems - Frontiers, accessed August 5, 2025
Contextual Support

Cover Crops and Fertilization Alter Nitrogen Loss in Organic and Conventional Conservation Agriculture Systems - Frontiers, accessed on May 31, 2025

View Source
Preview of Cover Crops Reduce Nitrate Leaching in Agroecosystems:A Global Meta-Analysis - PubMed, accessed August 5, 2025
Cover Crops Reduce Nitrate Leaching in Agroecosystems:A Global Meta-Analysis - PubMed, accessed August 5, 2025
Contextual Support

Cover Crops Reduce Nitrate Leaching in Agroecosystems:A Global Meta-Analysis - PubMed

View Source
Preview of Long-term forest paired catchment studies: What do they tell us that landscape-level monitoring does not?, accessed August 5, 2025
Long-term forest paired catchment studies: What do they tell us that landscape-level monitoring does not?, accessed August 5, 2025
Contextual Support

Long-term forest paired catchment studies: What do they tell us that landscape-level monitoring does not?

View Source
Preview of Monitoring and reporting on water quality - Environment and Heritage, accessed August 5, 2025
Monitoring and reporting on water quality - Environment and Heritage, accessed August 5, 2025
Contextual Support Regulatory Framework

Australian and New Zealand guidelines for fresh and marine water quality, accessed August 3, 2025

View Source
Preview of Murray–Darling Basin Plan - DCCEEW, accessed August 5, 2025
Murray–Darling Basin Plan - DCCEEW, accessed August 5, 2025
Regulatory Framework

Murray–Darling Basin Plan - DCCEEW

View Source
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
Direct Evidence Government

Toxicant default guideline values for aquatic ecosystem protection: Nitrate in freshwater - Water Quality Australia, accessed July 13, 2025,

View Source
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
Contextual Support

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

View Source
Preview of Nitrate Water Quality Guidelines, accessed August 5, 2025
Nitrate Water Quality Guidelines, accessed August 5, 2025
Regulatory Framework Journal

Nitrate Water Quality Guidelines, accessed August 11, 2025,

View Source
Preview of NITROGEN AND PHOSPHORUS CONCENTRATIONS IN FOREST STREAMS OF THE UNITED STATES1 - at Clark University, accessed August 5, 2025
NITROGEN AND PHOSPHORUS CONCENTRATIONS IN FOREST STREAMS OF THE UNITED STATES1 - at Clark University, accessed August 5, 2025
Contextual Support Cross Reference Journal

NITROGEN AND PHOSPHORUS CONCENTRATIONS IN FOREST STREAMS OF THE UNITED STATES1 - at Clark University

View Source
Preview of Nitrogen and phosphorus relationships to benthic algal biomass in temperate streams - SciSpace, accessed August 5, 2025
Nitrogen and phosphorus relationships to benthic algal biomass in temperate streams - SciSpace, accessed August 5, 2025
Contextual Support Journal

Nitrogen and phosphorus relationships to benthic algal biomass in temperate streams - SciSpace

View Source
Preview of Patterns and Drivers of Groundwater and Stream Nitrate Concentrations in Intensively Managed Agricultural Catchments - MDPI, accessed August 5, 2025
Patterns and Drivers of Groundwater and Stream Nitrate Concentrations in Intensively Managed Agricultural Catchments - MDPI, accessed August 5, 2025
Contextual Support

Patterns and Drivers of Groundwater and Stream Nitrate Concentrations in Intensively Managed Agricultural Catchments - MDPI, accessed August 10, 2025,

View Source
Preview of Prospects for summer cover crops in southern Australian semi-arid cropping systems, accessed August 5, 2025
Prospects for summer cover crops in southern Australian semi-arid cropping systems, accessed August 5, 2025
Contextual Support

Prospects for summer cover crops in southern Australian semi-arid cropping systems

View Source
Preview of Regenerative agriculture in Australia: the changing face of farming - Frontiers, accessed August 4, 2025
Regenerative agriculture in Australia: the changing face of farming - Frontiers, accessed August 4, 2025
Contextual Support Journal

NCC: Regenerative Agriculture and Soil Health - Wet Tropics Plan, accessed July 27, 2025,

View Source
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

View Source
Preview of Total Nitrogen - DCCEEW, accessed August 8, 2025
Total Nitrogen - DCCEEW, accessed August 8, 2025
Contextual Support Government

The impact of nitrate pollution in waterways on freshwater species, accessed July 31, 2025,

View Source
Preview of Water quality | Australia state of the environment 2021, accessed August 11, 2025,
Water quality | Australia state of the environment 2021, accessed August 11, 2025,
Contextual Support Government

Drivers of water quality in Afromontane-savanna rivers - Frontiers

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

Water quality | Murray–Darling Basin Authority, accessed July 25, 2025

View Source
Preview of Water quality assessment for sustainable agriculture in the Wet Tropics: a community-assisted approach - ResearchOnline@JCU, accessed August 5, 2025
Water quality assessment for sustainable agriculture in the Wet Tropics: a community-assisted approach - ResearchOnline@JCU, accessed August 5, 2025
Contextual Support

Water quality assessment for sustainable agriculture in the Wet Tropics: a community-assisted approach - ResearchOnline@JCU

View Source
Preview of Water quality guidelines - Queensland Environment Department, accessed August 1, 2025,
Water quality guidelines - Queensland Environment Department, accessed August 1, 2025,
Regulatory Framework Government

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

View Source
Preview of Water Quality Guidelines Level of protection, accessed August 11, 2025,
Water Quality Guidelines Level of protection, accessed August 11, 2025,
Regulatory Framework Government

Water quality objectives for the Darwin Harbour Region, accessed July 25, 2025,

View Source
Preview of Wet year causes low quantities of nitrate under derogation farms - RIVM, accessed August 5, 2025
Wet year causes low quantities of nitrate under derogation farms - RIVM, accessed August 5, 2025
Contextual Support

Wet year causes low quantities of nitrate under derogation farms - RIVM

View Source
Preview of When do cover crops reduce nitrate leaching? A global meta‐analysis - PubMed Central, accessed August 5, 2025
When do cover crops reduce nitrate leaching? A global meta‐analysis - PubMed Central, accessed August 5, 2025
Contextual Support

When do cover crops reduce nitrate leaching? A global meta‐analysis - PubMed Central

View Source
Preview of Winter Nitrate Leaching under Different Tillage and Winter Cover Crop Management Practices | Request PDF - ResearchGate, accessed August 5, 2025
Winter Nitrate Leaching under Different Tillage and Winter Cover Crop Management Practices | Request PDF - ResearchGate, accessed August 5, 2025
Contextual Support

Winter Nitrate Leaching under Different Tillage and Winter Cover Crop Management Practices | Request PDF - ResearchGate

View Source

Context

  • Region Australia
  • Biome Temperate Grassy Woodlands & Plains
  • Land Use Agricultural Crop Production
  • Assessment Pristine Reference
  • Evidence Type RegulatoryTrigger

Lifecycle

  • Status Active
  • Version 1
  • Effective From 15 Mar 2026

Notes

This threshold is part of the ANZG (2025 draft) toxicant Default Guideline Values (DGVs).

Related Benchmarks

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

0.7 mg/L Moderate
Agricultural Crop Production · Agricultural Biodiversity Target
MaximumOnly Active v1
0.2 mg/L Moderate
Agricultural Crop Production · Pristine Reference
Point Active v1