Water Turbidity

AUS-TGP-AQU-WTU General High confidence

Benchmark Value

20 NTU
Range: 10 to 30 NTU
Optimal Range: 10 to 30
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 3 benchmarks together — the Point form drives the primary score, while 2 guard(s) constrain the result.

Contributing Benchmarks

Point Primary MaximumOnly Guard MaximumOnly Guard

Evidence & Context

The analysis concludes that the most appropriate benchmark for water turbidity is 20 NTU.

Metric Definition:

Water turbidity as measured in NTU within sustainable freshwater aquaculture operations.

Benchmark Definition:

This benchmark represents the recommended water turbidity level for sustainable freshwater aquaculture in the Temperate Grassy Woodlands & Plains biome, based on regulatory standards ensuring environmental management and ecosystem health.

Justification:

This value is selected with high confidence as it represents a verifiable, best-practice regulatory standard for the specified land use. It sits within the lower-middle of the natural ambient range of 6–50 NTU for healthy lowland rivers in the Temperate Grassy Woodlands biome, indicating a high level of environmental management.

Sources (3)

Preview of Australian and New Zealand guidelines for fresh and marine water quality, accessed July 19, 2025,
Australian and New Zealand guidelines for fresh and marine water quality, accessed July 19, 2025, Government

Using the ANZECC Guidelines and Water Quality Objectives in NSW, accessed July 21, 2025,

View Source
Preview of The Impact of Turbidity on Fish Health in Aquaculture Systems, accessed August 10, 2025
The Impact of Turbidity on Fish Health in Aquaculture Systems, accessed August 10, 2025 GreyLiterature

The Impact of Turbidity on Fish Health in Aquaculture Systems, accessed August 10, 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, Government

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

View Source

Supporting Sources (32)

Additional references from the underlying research that informed this benchmark.

Preview of A Review of Research and Development Needs for Murray Cod Aquaculture in Australia - NSW Department of Primary Industries, accessed August 10, 2025
A Review of Research and Development Needs for Murray Cod Aquaculture in Australia - NSW Department of Primary Industries, accessed August 10, 2025
Contextual Support Journal

A Review of Research and Development Needs for Murray Cod Aquaculture in Australia - NSW Department of Primary Industries, accessed August 10, 2025

View Source
Preview of Ambient water quality monitoring of the River Murray 1990-1999 Report No. 1 - EPA SA, accessed August 10, 2025
Ambient water quality monitoring of the River Murray 1990-1999 Report No. 1 - EPA SA, accessed August 10, 2025
Contextual Support Journal

Ambient water quality monitoring of the River Murray 1990-1999 Report No. 1 - EPA SA, accessed August 10, 2025

View Source
Preview of ANZECC & ARMCANZ (2000) guidelines - Water Quality Australia, accessed August 12, 2025
ANZECC & ARMCANZ (2000) guidelines - Water Quality Australia, accessed August 12, 2025
Contextual Support Government

ANZECC & ARMCANZ (2000) guidelines - Water Quality Australia

View Source
Preview of Best Practice Salmonid Aquaculture Industry - VFA, accessed August 10, 2025
Best Practice Salmonid Aquaculture Industry - VFA, accessed August 10, 2025
Contextual Support Government

Best Practice Salmonid Aquaculture Industry - VFA, accessed August 10, 2025

View Source
Preview of Challenges and adaptation needs for water quality in the Murray-Darling Basin in response to climate change - UNSW Sydney, accessed August 10, 2025
Challenges and adaptation needs for water quality in the Murray-Darling Basin in response to climate change - UNSW Sydney, accessed August 10, 2025
Contextual Support Journal

Challenges and adaptation needs for water quality in the ... - UNSW

View Source
Preview of Characterising the relationship between water quality and water quantity, accessed August 5, 2025
Characterising the relationship between water quality and water quantity, accessed August 5, 2025
Contextual Support Journal

Report Card 2022-23 - EPA Victoria

View Source
Preview of Default guideline values - Water Quality Australia, accessed August 12, 2025
Default guideline values - Water Quality Australia, accessed August 12, 2025
Contextual Support Government

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

View Source
Preview of Development of a Health Management Strategy for the Silver Perch Aquaculture Industry., accessed July 20, 2025,
Development of a Health Management Strategy for the Silver Perch Aquaculture Industry., accessed July 20, 2025,
Contextual Support Government

Silver perch aquaculture | Business Queensland, accessed August 10, 2025

View Source
Preview of Freshwater aquaculture | Business Queensland, accessed August 1, 2025
Freshwater aquaculture | Business Queensland, accessed August 1, 2025
Contextual Support Government

Freshwater aquaculture | Business Queensland, accessed August 1, 2025,

View Source
Preview of GRASSLANDS & GRASSY WOODLANDS - Corangamite Catchment Management Authority, accessed August 5, 2025,
GRASSLANDS & GRASSY WOODLANDS - Corangamite Catchment Management Authority, accessed August 5, 2025,
Contextual Support Journal

(PDF) Identifying ecological barriers to restoration in temperate ..., accessed August 11, 2025

View Source
Preview of Guidelines for constructing and maintaining aquaculture containment structures - Department of Primary Industries, Queensland
Guidelines for constructing and maintaining aquaculture containment structures - Department of Primary Industries, Queensland
Contextual Support Journal

Guidelines for constructing and maintaining aquaculture containment structures - Department of Primary Industries, Queensland, accessed August 10, 2025

View Source
Preview of Improvement of the Water Quality in Rainbow Trout Farming by Means of the Feeding Type and Management over 10 Years (2009–2019), accessed August 10, 2025
Improvement of the Water Quality in Rainbow Trout Farming by Means of the Feeding Type and Management over 10 Years (2009–2019), accessed August 10, 2025
Contextual Support Journal

Improvement of the Water Quality in Rainbow Trout Farming by Means of the Feeding Type and Management over 10 Years (2009–2019) - PMC

View Source
Preview of Inland Aquaculture in Western Australia - DPIRD's Digital library, accessed August 10, 2025
Inland Aquaculture in Western Australia - DPIRD's Digital library, accessed August 10, 2025
Contextual Support

Inland Aquaculture in Western Australia - DPIRD's Digital library, accessed August 10, 2025

View Source
Preview of Jurisdictional information - Water Quality Australia, accessed August 10, 2025
Jurisdictional information - Water Quality Australia, accessed August 10, 2025
Regulatory Framework Government

Jurisdictional information - Water Quality Australia, accessed August 11, 2025

View Source
Preview of Mapping and describing your natural resources - MBFP-Pastoral, accessed August 10, 2025
Mapping and describing your natural resources - MBFP-Pastoral, accessed August 10, 2025
Contextual Support GreyLiterature

soils and landscapes of mulga lands with special reference to south western queensland, accessed August 28, 2025,

View Source
Preview of Murray Cod | Department of Primary Industries, accessed July 20, 2025,
Murray Cod | Department of Primary Industries, accessed July 20, 2025,
Contextual Support Government

Murray Cod | Department of Primary Industries, accessed August 10, 2025

View Source
Preview of Murray River catchment (NSW) Water Quality Objectives explained, accessed August 10, 2025
Murray River catchment (NSW) Water Quality Objectives explained, accessed August 10, 2025
Regulatory Framework Government

Murray River catchment (NSW) Water Quality Objectives explained, accessed August 10, 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 Redclaw crayfish aquaculture | Business Queensland, accessed August 10, 2025
Redclaw crayfish aquaculture | Business Queensland, accessed August 10, 2025
Contextual Support Government

Redclaw crayfish aquaculture | Business Queensland, accessed August 10, 2025

View Source
Preview of Restoring sustainability to Murray-Darling Basin freshwater fish and aquatic ecosystems - Australian Academy of Technological Sciences & Engineering, accessed August 10, 2025
Restoring sustainability to Murray-Darling Basin freshwater fish and aquatic ecosystems - Australian Academy of Technological Sciences & Engineering, accessed August 10, 2025
Contextual Support Journal

Restoring sustainability to Murray-Darling Basin freshwater fish and aquatic ecosystems - Australian Academy of Technological Sciences & Engineering, accessed August 10, 2025

View Source
Preview of Silver Perch - breeding - NSW Department of Primary Industries, accessed August 10, 2025
Silver Perch - breeding - NSW Department of Primary Industries, accessed August 10, 2025
Contextual Support Government

Silver Perch - breeding - NSW Department of Primary Industries, accessed August 10, 2025

View Source
Preview of Silver Perch | Department of Primary Industries
Silver Perch | Department of Primary Industries
Contextual Support Government

Silver Perch | Department of Primary Industries, accessed August 10, 2025

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

Southeast Australia temperate savanna - Wikipedia

View Source
Preview of State Environment Protection Policy (Waters of Victoria) - Policy ..., accessed August 10, 2025
State Environment Protection Policy (Waters of Victoria) - Policy ..., accessed August 10, 2025
Contextual Support Journal

State Environment Protection Policy (Waters of Victoria) - Policy ..., accessed August 10, 2025

View Source
Preview of The effects of turbidity and complex habitats on the feeding of a galaxiid fish are clear and simple - CSIRO PUBLISHING | Marine and Freshwater Research, accessed August 10, 2025
The effects of turbidity and complex habitats on the feeding of a galaxiid fish are clear and simple - CSIRO PUBLISHING | Marine and Freshwater Research, accessed August 10, 2025
Contextual Support Journal

The effects of turbidity and complex habitats on the feeding of a galaxiid fish are clear and simple - CSIRO PUBLISHING | Marine and Freshwater Research, accessed August 10, 2025

View Source
Preview of The effects of turbidity, prey density and environmental complexity on the feeding of juvenile Murray cod Maccullochella peelii | Request PDF - ResearchGate, accessed July 16, 2025,
The effects of turbidity, prey density and environmental complexity on the feeding of juvenile Murray cod Maccullochella peelii | Request PDF - ResearchGate, accessed July 16, 2025,
Direct Evidence

The effects of turbidity, prey density and environmental complexity on the feeding of juvenile Murray cod Maccullochella peelii | Request PDF - ResearchGate, accessed August 10, 2025

View Source
Preview of Using the ANZECC Guidelines and Water Quality Objectives in NSW, accessed August 11, 2025,
Using the ANZECC Guidelines and Water Quality Objectives in NSW, accessed August 11, 2025,
Contextual Support Journal

Australian and New Zealand Guidelines for Fresh and Marine Water Quality (2000) - Tuvalu Environment Data Portal, accessed July 19, 2025,

View Source
Preview of Water quality | Murray–Darling Basin Authority, accessed August 5, 2025
Water quality | Murray–Darling Basin Authority, accessed August 5, 2025
Contextual Support

Water quality | Murray–Darling Basin Authority, accessed July 25, 2025

View Source
Preview of Water Quality Guidelines Water quality objectives - Water Quality Australia, accessed August 10, 2025
Water Quality Guidelines Water quality objectives - Water Quality Australia, accessed August 10, 2025
Contextual Support Government

Water Quality Guidelines Water quality objectives - Water Quality Australia, accessed August 10, 2025

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 Objectives - Border Rivers (NSW) - NSW Government, accessed August 10, 2025
Water Quality Objectives - Border Rivers (NSW) - NSW Government, accessed August 10, 2025
Regulatory Framework Government

Water Quality Objectives - Border Rivers (NSW) - NSW Government, 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 Temperate Grassy Woodlands & Plains
  • Land Use Aquaculture
  • Assessment Conservation Target
  • Evidence Type TargetCondition

Lifecycle

  • Status Active
  • Version 1
  • Effective From 16 Mar 2026

Notes

Lower Critical Threshold: 5 NTU. Upper Detrimental Threshold: 50 NTU. Levels consistently below 5 NTU may indicate a sterile pond environment, while levels above 50 NTU are detrimental, causing risks such as reduced light penetration and harm to aquatic life.

Related Benchmarks

Other benchmarks in the AUS-TGP-AQU-WTU family.

5 NTU Moderate
Aquaculture · Pristine Reference
LowerThreshold Active v1
— NTU Moderate
Aquaculture · Pristine Reference
OptimalRange Active v1
50 NTU Moderate
Aquaculture · Pristine Reference
UpperThreshold Active v1