Water Nitrate

AUS-AMR-FOR-WNI General Moderate confidence

Benchmark Value

0.04 mg/L
Range: 0.04 to 0.04 mg/L
Thresholds: Lower: —, Upper: 1
Optimal Range: 0.04 to 0.04
Direction: Lower is desirable ↓
Form: Point

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 LowerThreshold Guard UpperThreshold Guard OptimalRange Guard Point Guard

Evidence & Context

The proposed benchmark for water nitrate, representing the best available condition under production forestry, is the median antecedent value observed in the south-eastern Australian Pinus radiata plantation study.1 Reference Value: 0.04 mg/L (as Nitrate-N)

Metric Definition:

Water nitrate concentration as nitrate-nitrogen (Nitrate-N) in stream water

Benchmark Definition:

This benchmark represents the typical water nitrate concentration under production forestry in the Arid Mountain Ranges & Uplands biome of Australia, reflecting the best available condition observed in managed Pinus radiata plantations.

Justification:

It reflects the water quality of a catchment under established plantation cover but prior to major periodic disturbances like fertilization, making it an excellent proxy for the 'best-on-offer' baseline state that management should aim to maintain.

Sources (4)

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 Journal

“Trigger” values for New Zealand rivers - Ministry for the Environment, accessed July 31, 2025,

View Source
Preview of Long-term changes in water quality and solute exports in headwater ...
Long-term changes in water quality and solute exports in headwater ... Journal

Long-term changes in water quality and solute exports in headwater ..., accessed July 31, 2025,

View Source
Preview of Looking to improve water quality? Plant more trees, accessed August 1, 2025,
Looking to improve water quality? Plant more trees, accessed August 1, 2025, GreyLiterature

Stream nitrate in planted forests - Scion Research, accessed July 31, 2025,

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

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

View Source

Supporting Sources (17)

Additional references from the underlying research that informed this benchmark.

Preview of A review of water quality studies relevant to northern Australia - CSIRO, accessed July 21, 2025,
A review of water quality studies relevant to northern Australia - CSIRO, accessed July 21, 2025,
Contextual Support Journal

Salinity and water quality

View Source
Preview of Australian and New Zealand Governments (ANZG). (2018). Australian and New Zealand Guidelines for Fresh and Marine Water Quality. Canberra ACT, Australia. 32
Australian and New Zealand Governments (ANZG). (2018). Australian and New Zealand Guidelines for Fresh and Marine Water Quality. Canberra ACT, Australia. 32
Regulatory Framework Journal

Environmental Values, Water Quality Objectives and Targets for the Black Ross Water Quality Improvement Plan Appendices December - Creek to Coral, accessed July 31, 2025,

View Source
Preview of Climate and river health | Murray–Darling Basin Authority
Climate and river health | Murray–Darling Basin Authority
Contextual Support Government

The Ecological and Hydrological Significance of Ephemeral and Intermittent Streams in the Arid and Semi-arid American Southwest - Environmental Protection Agency (EPA), accessed July 31, 2025,

View Source
Preview of Ecological condition of central Australian arid-zone rivers - PubMed, accessed July 21, 2025
Ecological condition of central Australian arid-zone rivers - PubMed, accessed July 21, 2025
Contextual Support Journal

Ecological condition of central Australian arid-zone rivers - PubMed

View Source
Preview of Environmental Values, Water Quality Objectives and Targets for the Black Ross Water Quality Improvement Plan Appendices December - Creek to Coral, accessed May 11, 2025,
Environmental Values, Water Quality Objectives and Targets for the Black Ross Water Quality Improvement Plan Appendices December - Creek to Coral, accessed May 11, 2025,
Regulatory Framework Journal

Water quality for livestock

View Source
Preview of Issue 2: Water is polluted in urban, farming, and forestry areas | Ministry for the Environment, accessed July 31, 2025,
Issue 2: Water is polluted in urban, farming, and forestry areas | Ministry for the Environment, accessed July 31, 2025,
Contextual Support Government

Issue 2: Water is polluted in urban, farming, and forestry areas | Ministry for the Environment, accessed July 31, 2025,

View Source
Preview of Leaching of nitrate from temperate forests – effects of air pollution and forest management, accessed July 31, 2025,
Leaching of nitrate from temperate forests – effects of air pollution and forest management, accessed July 31, 2025,
Contextual Support Journal

Leaching of nitrate from temperate forests – effects of air pollution and forest management, accessed July 31, 2025,

View Source
Preview of Natural water systems | Australia state of the environment 2021, accessed July 16, 2025,
Natural water systems | Australia state of the environment 2021, accessed July 16, 2025,
Contextual Support Government

Characterising the relationship between water quality and water quantity, accessed July 19, 2025,

View Source
Preview of Natural water systems | Australia state of the environment 2021, accessed July 31, 2025,
Natural water systems | Australia state of the environment 2021, accessed July 31, 2025,
Contextual Support Journal

Natural water systems | Australia state of the environment 2021, accessed July 31, 2025,

View Source
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
Regulatory Framework Government

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

View Source
Preview of Quantifying Health in Ephemeral Rivers - eWater, accessed July 20, 2025,
Quantifying Health in Ephemeral Rivers - eWater, accessed July 20, 2025,
Contextual Support Journal

An environmental flow to an ephemeral creek increases the input of carbon and nutrients to a downstream receiving river, accessed August 1, 2025

View Source
Preview of Removal of nitrates from groundwater in remote indigenous settings in arid Central Australia - OPUS at UTS, accessed July 25, 2025,
Removal of nitrates from groundwater in remote indigenous settings in arid Central Australia - OPUS at UTS, accessed July 25, 2025,
Contextual Support Journal

Removal of nitrates from groundwater in remote indigenous settings in arid Central Australia - OPUS at UTS, accessed July 31, 2025,

View Source
Preview of River water quality: nitrogen | Stats NZ, accessed August 8, 2025
River water quality: nitrogen | Stats NZ, accessed August 8, 2025
Contextual Support Government

Environmental Monitoring of Nitrates and Other Water Quality Parameters: pH, Dissolved Oxygen (DO), Turbidity - Hanna Instruments Australia, accessed July 31, 2025,

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

Toxicant default guideline values for aquatic ecosystem protection ...

View Source
Preview of Water quality | Murray–Darling Basin Authority, accessed July 31, 2025,
Water quality | Murray–Darling Basin Authority, accessed July 31, 2025,
Contextual Support Journal

Influence of Forest Harvest on Nitrate Concentration in Temperate Streams—A Meta-Analysis - MDPI, accessed July 31, 2025,

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 - Queensland Environment Department, accessed August 4, 2025,
Water quality guidelines - Queensland Environment Department, accessed August 4, 2025,
Contextual Support Journal

Salinity | Murray–Darling Basin Authority, accessed August 8, 2025,

View Source

Context

  • Region Australia
  • Biome Arid Mountain Ranges & Uplands
  • Land Use Production Forestry
  • Assessment Pristine Reference
  • Evidence Type ReferenceCondition

Lifecycle

  • Status Active
  • Version 1
  • Effective From 19 Mar 2026

Notes

Lower Critical Threshold: Not ecologically relevant; lower concentrations indicate better ecosystem health. Optimal Range: The optimal state is at or near the benchmark value of 0.04 mg/L. Upper Detrimental Threshold: A threshold of ~1.0 mg/L is proposed, based on evidence that concentrations above this level represent a departure from 'excellent' conditions and pose a risk of sub-lethal impacts that reduce ecosystem resilience to other stressors like heat and acidity.