Water Turbidity

AUS-AMR-AGR-WTU General Low confidence

Benchmark Value

No specific value — see range
Range: 2 to 25 NTU
Optimal Range: 2 to 25
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 9 benchmarks together — the OptimalRange form drives the primary score, while 8 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary MaximumOnly Guard Point Guard MaximumOnly Guard UpperThreshold Guard MaximumOnly Guard MaximumOnly Guard OptimalRange Guard MaximumOnly Guard

Evidence & Context

The ANZECC 2000 default trigger value range for turbidity in Upland Rivers in South-East Australia is 2–25 NTU.

Metric Definition:

Water turbidity measured as the concentration of suspended particles in water, expressed in Nephelometric Turbidity Units (NTU).

Benchmark Definition:

This benchmark defines the typical turbidity range for upland river ecosystems in the specified biome and land use, based on ANZECC 2000 trigger values representing slightly to moderately disturbed conditions.

Justification:

Derived from the Australian and New Zealand Guidelines for Fresh and Marine Water Quality (ANZECC 2000) for Upland Rivers, representing a proxy benchmark for the specified biome and land use.

Sources (1)

Preview of Restore the Soil: Prosper the Nation, accessed May 11, 2025
Restore the Soil: Prosper the Nation, accessed May 11, 2025 Journal

ANZECC & ARMCANZ (2000) guidelines - Water Quality Australia

View Source

Supporting Sources (22)

Additional references from the underlying research that informed this benchmark.

Preview of (PDF) Water quality parameters and population characteristics for the Flinders Ranges Gudgeon - ResearchGate
(PDF) Water quality parameters and population characteristics for the Flinders Ranges Gudgeon - ResearchGate
Contextual Support

Toxicant default guideline values for aquatic ecosystem protection ...

View Source
Preview of A BIOLOGICAL SURVEY OF THE FLINDERS RANGES SOUTH AUSTRALIA - Enviro Data SA
A BIOLOGICAL SURVEY OF THE FLINDERS RANGES SOUTH AUSTRALIA - Enviro Data SA
Contextual Support Journal

A BIOLOGICAL SURVEY OF THE FLINDERS RANGES SOUTH AUSTRALIA - Enviro Data SA, accessed July 28, 2025

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

Namoi River Water Quality Objectives explained - NSW Government

View Source
Preview of Arid habitats - The Australian Museum, accessed July 13, 2025
Arid habitats - The Australian Museum, accessed July 13, 2025
Contextual Support GreyLiterature

Alice Springs Regional Weeds Strategy 2021-2026 - Northern Territory Government

View Source
Preview of ARID LANDS OF AUSTRALIA - Open Research Repository, accessed July 15, 2025,
ARID LANDS OF AUSTRALIA - Open Research Repository, accessed July 15, 2025,
Contextual Support Journal

BioMetric: Vegetation condition benchmarks, short-term review

View Source
Preview of Assessing Water Quality - Secondary Education Years 9 to 12 - Upper Murrumbidgee Waterwatch, accessed August 12, 2025,
Assessing Water Quality - Secondary Education Years 9 to 12 - Upper Murrumbidgee Waterwatch, accessed August 12, 2025,
Contextual Support Journal

Assessing water quality - ACT Waterwatch.

View Source
Preview of Australia - Land, Climate, People | Britannica, accessed July 27, 2025,
Australia - Land, Climate, People | Britannica, accessed July 27, 2025,
Contextual Support GreyLiterature

Australia - Land, Climate, People - Britannica

View Source
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

Buffel grass in Queensland's semi-arid woodlands - CSIRO Publishing, accessed July 13, 2025

View Source
Preview of Dryland cropping zones in Australia between the 300 and 600mm rainfall... - ResearchGate, accessed July 6, 2025,
Dryland cropping zones in Australia between the 300 and 600mm rainfall... - ResearchGate, accessed July 6, 2025,
Contextual Support GreyLiterature

Environment Monitoring Systems & Data for Ecosystem Studies ..., accessed July 27, 2025,

View Source
Preview of Ecosystems | Australia state of the environment 2021, accessed July 27, 2025,
Ecosystems | Australia state of the environment 2021, accessed July 27, 2025,
Contextual Support GreyLiterature

Australia state of the environment 2021: land, accessed July 27, 2025,

View Source
Preview of Environment Monitoring Systems & Data for Ecosystem Studies ..., accessed July 30, 2025,
Environment Monitoring Systems & Data for Ecosystem Studies ..., accessed July 30, 2025,
Contextual Support Government

(PDF) Evaluation of genetic markers for the metabarcoding of ...

View Source
Preview of Land use in Australia at a glance, accessed July 27, 2025,
Land use in Australia at a glance, accessed July 27, 2025,
Contextual Support Journal

Land use in Australia at a glance, accessed July 27, 2025,

View Source
Preview of Marine ecosystem impacts - Reef 2050 Water Quality Improvement Plan, accessed August 1, 2025,
Marine ecosystem impacts - Reef 2050 Water Quality Improvement Plan, accessed August 1, 2025,
Contextual Support Journal

Australia's State of the Forests Report 2018 – Criterion 4 - DAFF, accessed August 1, 2025

View Source
Preview of Marine ecosystem impacts - Reef 2050 Water Quality Improvement Plan, accessed July 27, 2025,
Marine ecosystem impacts - Reef 2050 Water Quality Improvement Plan, accessed July 27, 2025,
Irrelevant

Marine ecosystem impacts - Reef 2050 Water Quality Improvement Plan, accessed July 27, 2025,

View Source
Preview of National Guidelines for Water Quality - Department of Natural Resources and Environment Tasmania, accessed August 1, 2025,
National Guidelines for Water Quality - Department of Natural Resources and Environment Tasmania, accessed August 1, 2025,
Contextual Support

Using the ANZECC Guidelines and Water Quality Objectives in NSW

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,
Direct Evidence Journal

Regenerative Agriculture—A Literature Review on the Practices and Mechanisms Used to Improve Soil Health - MDPI, accessed July 20, 2025,

View Source
Preview of TERN: Terrestrial Ecosystem Research Network - The Waite, accessed July 15, 2025
TERN: Terrestrial Ecosystem Research Network - The Waite, accessed July 15, 2025
Contextual Support

A Vegetation and Soil Survey Method for Surveillance Monitoring of Rangeland Environments - Frontiers, accessed July 15, 2025

View Source
Preview of The Geography Of Arid Zone Cropping Of Australia And Other Countries - Bartleby.com, accessed July 27, 2025,
The Geography Of Arid Zone Cropping Of Australia And Other Countries - Bartleby.com, accessed July 27, 2025,
Contextual Support GreyLiterature

The Geography Of Arid Zone Cropping Of Australia And Other Countries - Bartleby.com, accessed July 27, 2025,

View Source
Preview of Water quality for primary industries, accessed July 27, 2025,
Water quality for primary industries, accessed July 27, 2025,
Contextual Support Journal

The impacts of bushfires on freshwater ecosystems, accessed July 27, 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,
Contextual Support Government

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

View Source
Preview of Water Quality Objectives - Border Rivers - NSW Government, accessed August 12, 2025
Water Quality Objectives - Border Rivers - NSW Government, accessed August 12, 2025
Contextual Support Government

(PDF) Impact of mitigated forestry activities on turbidity: assessing ...

View Source
Preview of Water quality of surface water environments - NSW Government Water, accessed August 1, 2025,
Water quality of surface water environments - NSW Government Water, accessed August 1, 2025,
Contextual Support Government

National Guidelines for Water Quality | Department of Natural ...

View Source

Context

  • Region Australia
  • Biome Arid Mountain Ranges & Uplands
  • Land Use Agricultural Crop Production
  • Assessment Not Stated
  • Evidence Type RegulatoryTrigger

Lifecycle

  • Status Active
  • Version 1
  • Effective From 4 Jun 2026

Notes

This benchmark is a proxy derived from the ANZECC 2000 default trigger values for 'Upland Rivers' in 'slightly to moderately disturbed ecosystems'. The range reflects natural variability, with lower values (<5 NTU) representing an optimal state for baseflow conditions under best-practice management. Sustained levels above 25 NTU are considered detrimental to ecosystem health. The concept of a critically low turbidity level is not supported by ecological literature; clearer water consistently indicates higher health. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.

Related Benchmarks

Other benchmarks in the AUS-AMR-AGR-WTU family.

5 NTU Low
Agricultural Crop Production · Not Stated
MaximumOnly Active v1