Water Turbidity

AUS-AMR-AGR-WTU General Moderate confidence

Benchmark Value

25 NTU
Thresholds: Lower: —, Upper: 25
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 OptimalRange Guard MaximumOnly Guard MaximumOnly Guard MinimumOnly Guard

Evidence & Context

The upper bound of the ANZECC Upland River range, 25 NTU, serves as the most scientifically defensible upper detrimental threshold for a system intended to be in a state of high environmental health.

Metric Definition:

Upper detrimental threshold for water turbidity indicating potential environmental harm.

Benchmark Definition:

Threshold turbidity level above which ecological harm is likely and further investigation is triggered.

Justification:

Values above 25 NTU indicate a departure from a 'low risk,' high-health state and signify environmental degradation.

Sources (1)

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, Journal

Regenerative Agriculture—A Literature Review on the Practices and Mechanisms Used to Improve Soil Health - MDPI, accessed August 28, 2025,

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 31, 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

Arid habitats - The Australian Museum, accessed July 27, 2025,

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

ARID LANDS OF AUSTRALIA - ANU Open Research, accessed July 22, 2025

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

Management Standards and Procedures for timber harvesting operations in Victoria’s State forests

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 GreyLiterature

TERN Ecosystem Surveillance & Environmental Monitoring Systems

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

TERN: Terrestrial Ecosystem Research Network - The Waite, accessed July 27, 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

Australian and New Zealand Guidelines for Fresh and Marine Water ...

View Source
Preview of Restore the Soil: Prosper the Nation, accessed May 11, 2025
Restore the Soil: Prosper the Nation, accessed May 11, 2025
Direct Evidence Journal

Snapshot of Australian Agriculture 2025 - DAFF, accessed August 4, 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

Arid Zone Monitoring: Surveys for vertebrates across arid and semi-arid zones, accessed July 27, 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 ..., accessed August 10, 2025

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 Pristine Reference
  • Evidence Type DegradationThreshold

Lifecycle

  • Status Active
  • Version 2
  • Effective From 19 Mar 2026

Notes

Exceeding this threshold can reduce photosynthesis, degrade habitat, harm fauna, transport pollutants, and alter thermal regimes.

Related Benchmarks

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

— NTU Moderate
Agricultural Crop Production · Pristine Reference
OptimalRange Active v1
5 NTU Moderate
Agricultural Crop Production · Pristine Reference
MaximumOnly Superseded v1