Water Nitrate — Benchmark Detail - Nature Index

Benchmark Value

No specific value — see range

Range: 0.002 to 0.01 mg/L

Optimal Range: 0.002 to 0.01

Direction: Lower is desirable ↓

Form: OptimalRange

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 Point Guard MaximumOnly Guard Point Guard UpperThreshold Guard

Evidence & Context

Based on the evidence, an optimal range for the annual median concentration of water nitrate is proposed as 0.002 to 0.010 mg/L (as N).

Metric Definition:

Dissolved Inorganic Nitrogen (DIN), which is composed almost entirely of nitrate (NO3−) and nitrite (NO2−) and is the most bioavailable form of nitrogen.

Benchmark Definition:

An optimal ecological range for the annual median concentration of water nitrate.

Justification:

This range is sufficiently above nitrogen limitation to support a healthy, productive forest ecosystem while remaining below the threshold for chronic stress on sensitive tropical aquatic environments.

Sources (1)

Preview of Water Quality Guidelines for the Great Barrier Reef Marine Park., accessed August 3, 2025,

Water Quality Guidelines for the Great Barrier Reef Marine Park., accessed August 3, 2025, Journal

Determining Tipping Points and Responses of Macroinvertebrate Traits to Abiotic Factors in Support of River Management - PubMed Central

Supporting Sources (25)

Additional references from the underlying research that informed this benchmark.

Preview of (PDF) Natural Capital Risk Assessment – Australian Forestry - ResearchGate

(PDF) Natural Capital Risk Assessment – Australian Forestry - ResearchGate

Contextual Support GreyLiterature

(PDF) Natural Capital Risk Assessment – Australian Forestry - ResearchGate

Preview of (PDF) Nitrogen Processes Within Tropical Mangroves in Australia - ResearchGate, accessed July 25, 2025,

(PDF) Nitrogen Processes Within Tropical Mangroves in Australia - ResearchGate, accessed July 25, 2025,

Contextual Support Journal

Nitrogen sources, attenuation, and management in subtropical coastal waterways - Cross Connect

Preview of (PDF) Water Quality Degradation of Coastal Waterways in the Wet Tropics, Australia, accessed August 2, 2025,

(PDF) Water Quality Degradation of Coastal Waterways in the Wet Tropics, Australia, accessed August 2, 2025,

Contextual Support GreyLiterature

Ecology of streams in a biogeographic isolate 6the Queensland Wet Tropics, Australia, accessed July 21, 2025

Preview of Annual Water Quality Monitoring Report - WaterNSW

Annual Water Quality Monitoring Report - WaterNSW

Contextual Support Journal

Nitrate in freshwater and marine water - Water Quality Australia

Preview of Development of basin-specific ecologically relevant water quality targets for the Great Barrier Reef

Development of basin-specific ecologically relevant water quality targets for the Great Barrier Reef

Contextual Support Journal

(PDF) Ten years of monitoring dissolved inorganic nitrogen in runoff from sugarcane informs development of a modelling algorithm to prioritise organic and inorganic nutrient management - ResearchGate

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,

Direct Evidence Journal

Queensland Water Quality Guidelines 2009

Preview of Diving deeper into nutrient pathways to help protect Lord Howe Island's marine haven, accessed August 4, 2025,

Diving deeper into nutrient pathways to help protect Lord Howe Island's marine haven, accessed August 4, 2025,

Contextual Support GreyLiterature

Managing urban and non-agricultural run-off to the Reef ..., accessed August 2, 2025

Preview of Forest management impacts on growth, diversity and nutrient cycling of lowland tropical rainforest and plantations, Papua New Guinea Hitofumi Abe - the UWA Profiles and Research Repository - The University of Western Australia

Forest management impacts on growth, diversity and nutrient cycling of lowland tropical rainforest and plantations, Papua New Guinea Hitofumi Abe - the UWA Profiles and Research Repository - The University of Western Australia

Contextual Support Journal

(PDF) LONG-TERM WATER BALANCE IN SMALL CATCHMENTS IN THE ATLANTIC FOREST OF SOUTHEAST BRAZIL - ResearchGate

Preview of Hydrology and water management on small tropical islands

Hydrology and water management on small tropical islands

Contextual Support Journal

Hydrology and water management on small tropical islands

Preview of Indicator 7.1e: Capacity to conduct and apply research and development aimed at improving forest management and delivery of forest goods and services (2024) - Supporting information - DAFF

Indicator 7.1e: Capacity to conduct and apply research and development aimed at improving forest management and delivery of forest goods and services (2024) - Supporting information - DAFF

Contextual Support GreyLiterature

Indicator 7.1e: Capacity to conduct and apply research and development aimed at improving forest management and delivery of forest goods and services (2024) - Supporting information - DAFF

Preview of Lord Howe Island Marine Park News Water Quality Research Collaboration, accessed August 3, 2025,

Lord Howe Island Marine Park News Water Quality Research Collaboration, accessed August 3, 2025,

Contextual Support Journal

Diving deeper into nutrient pathways to help protect Lord Howe Island's marine haven, accessed August 4, 2025

Preview of Memorandum - Nitrate guideline values in ANZECC 2000

Memorandum - Nitrate guideline values in ANZECC 2000

Contextual Support GreyLiterature

Memorandum - Nitrate guideline values in ANZECC 2000

Preview of Memorandum - Nitrate guideline values in ANZECC 2000, accessed August 8, 2025

Memorandum - Nitrate guideline values in ANZECC 2000, accessed August 8, 2025

Contextual Support Journal

Hickey, C. (2002). Nitrate guideline values in ANZECC 2000. Memorandum MFE02237 prepared for Ministry for the Environment (New Zealand). NIWA Client Report: HAM2002-126.

Preview of Movement of nitrogen through a riparian forest in a tropical, agricultural landscape

Movement of nitrogen through a riparian forest in a tropical, agricultural landscape

Direct Evidence Journal

Movement of nitrogen through a riparian forest in a tropical, agricultural landscape

Preview of Nitrate in freshwater and marine water - Water Quality Australia, accessed August 2, 2025,

Nitrate in freshwater and marine water - Water Quality Australia, accessed August 2, 2025,

Contextual Support

Memorandum - Nitrate guideline values in ANZECC 2000

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

Contextual Support Government

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

Preview of Nitrogen Leaching and Nitrogen Balance under Differing Nitrogen Fertilization for Sugarcane Cultivation on a Subtropical Island - MDPI

Nitrogen Leaching and Nitrogen Balance under Differing Nitrogen Fertilization for Sugarcane Cultivation on a Subtropical Island - MDPI

Contextual Support Journal

Nitrogen Leaching and Nitrogen Balance under Differing Nitrogen Fertilization for Sugarcane Cultivation on a Subtropical Island - MDPI

Preview of Seabirds Enhance Primary Producer and Consumer Isotope Signals on a Sub‐Tropical Island - PMC

Seabirds Enhance Primary Producer and Consumer Isotope Signals on a Sub‐Tropical Island - PMC

Contextual Support GreyLiterature

Seabirds Enhance Primary Producer and Consumer Isotope Signals on a Sub‐Tropical Island - PMC

Preview of Significant nitrate attenuation in a mangrove-fringed estuary during a flood-chase experiment | Request PDF - ResearchGate

Significant nitrate attenuation in a mangrove-fringed estuary during a flood-chase experiment | Request PDF - ResearchGate

Contextual Support Journal

(PDF) Water Quality Degradation of Coastal Waterways in the Wet Tropics, Australia

Preview of UNCORRECTED PROOF - CORE

UNCORRECTED PROOF - CORE

Contextual Support

UNCORRECTED PROOF - CORE

Preview of Water quality control in the humid tropics - Horizon IRD

Water quality control in the humid tropics - Horizon IRD

Contextual Support Journal

Water quality control in the humid tropics - Horizon IRD

Preview of Water Quality dataset, Great Barrier Reef | AIMS Data Repository

Water Quality dataset, Great Barrier Reef | AIMS Data Repository

Contextual Support Government

Water Quality dataset, Great Barrier Reef | AIMS Data Repository

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)

Preview of Water quality, biodiversity, and codes of practice in relation to harvesting forest plantations in streamside management zones

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

Contextual Support Government

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

Preview of wet tropics report card 2024 - waterway environment results

wet tropics report card 2024 - waterway environment results

Contextual Support Government

(PDF) 2022 Scientific Consensus Statement: Conclusions. In: 2022 Scientific Consensus Statement on land-based impacts on Great Barrier Reef water quality and ecosystem condition. - ResearchGate

Context

Region Australia
Biome Tropical & Subtropical Maritime Islands
Land Use Production Forestry
Assessment Pristine Reference
Vegetation Forest
Evidence Type ReferenceCondition

Lifecycle

Status Active
Version 1
Effective From 30 May 2026

Notes

The lower end of this range (0.002 mg/L) aligns with the most stringent regional objectives for high-quality waters, ensuring protection against degradation.

Related Benchmarks

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