Water Nitrate

AUS-TSW-FOR-WNI General Moderate confidence

Benchmark Value

4.4 mg/L
Direction: Lower is desirable ↓
Form: UpperThreshold

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 MinimumOnly Guard MaximumOnly Guard UpperThreshold Guard Point Guard MaximumOnly Guard

Evidence & Context

Based on temperate forest literature, this is estimated to begin around 4.4 mg/L NO3. Persistent concentrations above this level indicate ecosystem degradation and nutrient pollution.

Metric Definition:

Water nitrate concentrations representative of the best available ecological condition for production forestry within Australia's Temperate Semi-Arid Shrublands & Open Woodlands.

Benchmark Definition:

The point at which nitrate transitions from a scarce nutrient to a pollutant, signaling ecosystem degradation.

Justification:

The threshold is based on the onset of nitrogen saturation, where the forest ecosystem begins to 'leak' nitrogen, leading to soil acidification and eutrophication of aquatic systems.

Sources (1)

Preview of Indicators and thresholds for nitrogen saturation in ... - WUR eDepot
Indicators and thresholds for nitrogen saturation in ... - WUR eDepot Journal

Indicators and thresholds for nitrogen saturation in ... - WUR eDepot, accessed July 12, 2025

View Source

Supporting Sources (17)

Additional references from the underlying research that informed this benchmark.

Preview of Acacia forest - DAFF, accessed July 23, 2025
Acacia forest - DAFF, accessed July 23, 2025
Contextual Support Journal

Description of Ecological Communities: Arid Eucalypt Woodlands - NECs 1.14 to 1.23 - DCCEEW, accessed July 19, 2025

View Source
Preview of AUSTRALASIAN Temperate Dry Sclerophyll Forest & Woodlands (south-eastern), accessed July 12, 2025,
AUSTRALASIAN Temperate Dry Sclerophyll Forest & Woodlands (south-eastern), accessed July 12, 2025,
Contextual Support GreyLiterature

East Australian Mediterranean Woodlands & Temperate Savannas (AU4) - One Earth, accessed July 12, 2025

View Source
Preview of Australian native forest commerciality - DAFF, accessed July 30, 2025,
Australian native forest commerciality - DAFF, accessed July 30, 2025,
Contextual Support Journal

Using mulga as a forage supplement for livestock in droughts - NSW Department of Primary Industries, accessed July 30, 2025,

View Source
Preview of Characteristics of prokaryotic and fungal communities emerged in eco-engineered waste rock - Eucalyptus open woodlands at Ranger uranium mine - PubMed, accessed July 12, 2025
Characteristics of prokaryotic and fungal communities emerged in eco-engineered waste rock - Eucalyptus open woodlands at Ranger uranium mine - PubMed, accessed July 12, 2025
Contextual Support Journal

Characteristics of prokaryotic and fungal communities emerged in eco-engineered waste rock - Eucalyptus open woodlands at Ranger uranium mine - PubMed, accessed July 12, 2025

View Source
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

View Source
Preview of Examining Relationships Between Groundwater Nitrate Concentrations in Drinking Water and Landscape Characteristics to Understand - the NOAA Institutional Repository, accessed July 12, 2025
Examining Relationships Between Groundwater Nitrate Concentrations in Drinking Water and Landscape Characteristics to Understand - the NOAA Institutional Repository, accessed July 12, 2025
Direct Evidence Journal

Examining Relationships Between Groundwater Nitrate Concentrations in Drinking Water and Landscape Characteristics to Understand - the NOAA Institutional Repository, accessed July 12, 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

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

View Source
Preview of Nitrate concentration in source water - Puget Sound Vital Signs
Nitrate concentration in source water - Puget Sound Vital Signs
Direct Evidence
View Source
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

View Source
Preview of Review of the current state of knowledge for the monitoring of forestry impacts on waterway health in NSW coastal forests - Natural Resources Commission, accessed August 9, 2025
Review of the current state of knowledge for the monitoring of forestry impacts on waterway health in NSW coastal forests - Natural Resources Commission, accessed August 9, 2025
Methodology Source Journal

Review of the current state of knowledge for the monitoring of ..., accessed July 31, 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

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

Southeast Australia temperate savanna - Wikipedia

View Source
Preview of The effects of forest management on water quality | Request PDF - ResearchGate, accessed May 15, 2025,
The effects of forest management on water quality | Request PDF - ResearchGate, accessed May 15, 2025,
Methodology Source Journal

Plantations in public drinking water source areas - Government of ..., accessed July 31, 2025,

View Source
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
Contextual Support Journal

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

View Source
Preview of Toxicant default guideline values for aquatic ecosystem protection: Nitrate in freshwater - Water Quality Australia, accessed July 12, 2025
Toxicant default guideline values for aquatic ecosystem protection: Nitrate in freshwater - Water Quality Australia, accessed July 12, 2025
Contextual Support GreyLiterature

Relationships between water, nutrients and productivity in Australian forests: Application to wood production and quality - ResearchGate, accessed July 12, 2025

View Source
Preview of Transpiration of Eucalyptus woodlands across a natural gradient of depth-to-groundwater | Tree Physiology | Oxford Academic, accessed August 28, 2025,
Transpiration of Eucalyptus woodlands across a natural gradient of depth-to-groundwater | Tree Physiology | Oxford Academic, accessed August 28, 2025,
Contextual Support Journal

Australian native forest commerciality - DAFF, accessed July 12, 2025

View Source
Preview of Water quality, biodiversity, and codes of practice in relation to harvesting forest plantations in streamside management zones, accessed July 12, 2025
Water quality, biodiversity, and codes of practice in relation to harvesting forest plantations in streamside management zones, accessed July 12, 2025
Methodology Source Journal

Water quality, biodiversity, and codes of practice in relation to harvesting forest plantations in streamside management zones, accessed July 12, 2025

View Source

Context

  • Region Australia
  • Biome Temperate Semi-Arid Shrublands & Open Woodlands
  • Land Use Production Forestry
  • Assessment Not Stated
  • Evidence Type DegradationThreshold

Lifecycle

  • Status Active
  • Version 1
  • Effective From 28 May 2026

Notes

Upper Detrimental Threshold: 4.4 mg/L. Given the lower productivity and more pronounced nutrient limitations of Australian semi-arid woodlands, their nitrogen retention capacity is likely to be even lower, suggesting that 4.4 mg/L NO3 is a conservative (i.e., high-end) estimate for a detrimental threshold in this biome. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.

Related Benchmarks

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

1 mg/L Moderate
Production Forestry · Pristine Reference
MaximumOnly Active v1