Water Turbidity

AUS-AMR-LVG-WTU General Moderate confidence

Benchmark Value

1 NTU
Range: 0 to 15 NTU
Optimal Range: 0 to 15
Direction: Lower is desirable ↓
Form: MinimumOnly

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 13 benchmarks together — the OptimalRange form drives the primary score, while 12 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary OptimalRange Guard UpperThreshold Guard MinimumOnly Guard OptimalRange Guard Point Guard OptimalRange Guard UpperThreshold Guard MaximumOnly Guard LowerThreshold Guard OptimalRange Guard UpperThreshold Guard Point Guard

Evidence & Context

The reference condition for a healthy, undisturbed upland stream is one of high clarity, with turbidity values often around 1 NTU.

Metric Definition:

Lower boundary of water turbidity indicating pristine or near-pristine conditions in upland streams.

Benchmark Definition:

Lower boundary for turbidity representing the clearest water typical of pristine upland streams.

Justification:

No evidence of a lower critical threshold; lower turbidity consistently indicates better ecological health.

Sources (1)

Preview of Turbidity in Surface Water 14 Rehabilitation Standard for the Ranger uranium mine - DCCEEW, accessed August 1, 2025,
Turbidity in Surface Water 14 Rehabilitation Standard for the Ranger uranium mine - DCCEEW, accessed August 1, 2025,

Turbidity in Surface Water 14 Rehabilitation Standard for the Ranger uranium mine - DCCEEW, accessed August 1, 2025,

View Source

Supporting Sources (35)

Additional references from the underlying research that informed this benchmark.

Preview of (PDF) The Impact of Extreme Low Flows on the Water Quality of the Lower Murray River and Lakes (South Australia) - ResearchGate, accessed May 10, 2025,
(PDF) The Impact of Extreme Low Flows on the Water Quality of the Lower Murray River and Lakes (South Australia) - ResearchGate, accessed May 10, 2025,
Contextual Support Journal

Water in mining and industry

View Source
Preview of (PDF) Water quality in two Australian dryland rivers: spatial and temporal variability and the role of flow - ResearchGate, accessed July 30, 2025,
(PDF) Water quality in two Australian dryland rivers: spatial and temporal variability and the role of flow - ResearchGate, accessed July 30, 2025,
Contextual Support

(PDF) Effects of increasing salinity on freshwater ecosystems in Australia - ResearchGate

View Source
Preview of 1.5.2.1 Surface water - Bioregional Assessments |, accessed July 30, 2025,
1.5.2.1 Surface water - Bioregional Assessments |, accessed July 30, 2025,
Contextual Support Methodology Source Government

1.5.2.1 Surface water - Bioregional Assessments |, accessed July 30, 2025,

View Source
Preview of 3.2.4 Sediment exposure, accessed July 30, 2025,
3.2.4 Sediment exposure, accessed July 30, 2025,
Contextual Support Government

3.2.4 Sediment exposure, accessed July 30, 2025,

View Source
Preview of 5.5 Turbidity | Monitoring & Assessment - EPA Archives, accessed July 30, 2025,
5.5 Turbidity | Monitoring & Assessment - EPA Archives, accessed July 30, 2025,
Contextual Support Government

5.5 Turbidity | Monitoring & Assessment - EPA Archives, accessed August 3, 2025

View Source
Preview of An environmental flow to an ephemeral creek increases the input of carbon and nutrients to a downstream receiving river - Frontiers, accessed July 20, 2025
An environmental flow to an ephemeral creek increases the input of carbon and nutrients to a downstream receiving river - Frontiers, accessed July 20, 2025
Contextual Support Journal

Connectivity – New South Wales Irrigators' Council, accessed July 17, 2025

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 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,
Contextual Support Journal

Defining reference condition for South Australian streams ... - EPA SA, accessed August 3, 2025

View Source
Preview of Discover the Top 6 Benefits of Regenerative Farming in Australia, accessed August 5, 2025,
Discover the Top 6 Benefits of Regenerative Farming in Australia, accessed August 5, 2025,
Contextual Support GreyLiterature

The relationships between land management practices and soil condition and the quality of ecosystem services delivered from agri - DAFF

View Source
Preview of Effects of Sedimentation and Turbidity on Lotic Food Webs: A Concise Review for Natural Resource Managers - ResearchGate, accessed July 16, 2025,
Effects of Sedimentation and Turbidity on Lotic Food Webs: A Concise Review for Natural Resource Managers - ResearchGate, accessed July 16, 2025,
Contextual Support

Effects of Sedimentation and Turbidity on Lotic Food Webs: A Concise Review for Natural Resource Managers - ResearchGate, accessed August 17, 2025

View Source
Preview of Exploring Stream Turbidity and Excess Sediment - Grand Valley State University, accessed July 30, 2025,
Exploring Stream Turbidity and Excess Sediment - Grand Valley State University, accessed July 30, 2025,
Contextual Support Journal

Exploring Stream Turbidity and Excess Sediment - Grand Valley State University, accessed July 30, 2025,

View Source
Preview of Grazing the surface of agricultural effects on water quality – impacts of in-stream cattle activity - RSC Blogs - The Royal Society of Chemistry, accessed July 30, 2025,
Grazing the surface of agricultural effects on water quality – impacts of in-stream cattle activity - RSC Blogs - The Royal Society of Chemistry, accessed July 30, 2025,
Contextual Support GreyLiterature

Grazing the surface of agricultural effects on water quality – impacts of in-stream cattle activity - RSC Blogs - The Royal Society of Chemistry, accessed July 30, 2025,

View Source
Preview of Guidance document for assessing and managing water quality in temporary waters, accessed July 16, 2025,
Guidance document for assessing and managing water quality in temporary waters, accessed July 16, 2025,
Contextual Support Journal

Guidance document for assessing and managing water quality in temporary waters, accessed July 10, 2025,

View Source
Preview of How has Australia's river water quality changed over two decades?, accessed July 30, 2025,
How has Australia's river water quality changed over two decades?, accessed July 30, 2025,
Contextual Support GreyLiterature

How has Australia's river water quality changed over two decades?, accessed July 30, 2025,

View Source
Preview of Impacts of Natural Land Loss on Water Quality - WeConservePA Library, accessed July 30, 2025,
Impacts of Natural Land Loss on Water Quality - WeConservePA Library, accessed July 30, 2025,
Contextual Support GreyLiterature

Impacts of Natural Land Loss on Water Quality - WeConservePA Library, accessed July 30, 2025,

View Source
Preview of Land-use effects on water quality in an intensively managed catchment in the Australian humid tropics | Request PDF - ResearchGate, accessed July 30, 2025,
Land-use effects on water quality in an intensively managed catchment in the Australian humid tropics | Request PDF - ResearchGate, accessed July 30, 2025,
Contextual Support Journal

Land-use effects on water quality in an intensively managed ...

View Source
Preview of Landscape rehydration and regenerative agriculture improves soil health, accessed July 30, 2025,
Landscape rehydration and regenerative agriculture improves soil health, accessed July 30, 2025,
Contextual Support GreyLiterature

Soil Health and Regenerative Agriculture - Southern Queensland Landscapes, accessed July 27, 2025,

View Source
Preview of Linking Sediment Dynamics, Riparian Vegetation and Aquatic Ecology in the Ovens River – Part 2 - La Trobe, accessed July 30, 2025,
Linking Sediment Dynamics, Riparian Vegetation and Aquatic Ecology in the Ovens River – Part 2 - La Trobe, accessed July 30, 2025,
Contextual Support

Linking Sediment Dynamics, Riparian Vegetation and Aquatic Ecology in the Ovens River – Part 2 - La Trobe, accessed July 30, 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 Direct Evidence

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

View Source
Preview of Northern and Yorke | Managing watercourses - Landscape South Australia, accessed July 30, 2025,
Northern and Yorke | Managing watercourses - Landscape South Australia, accessed July 30, 2025,
Contextual Support Government

Northern and Yorke | Managing watercourses - Landscape South Australia, accessed July 30, 2025,

View Source
Preview of Nutrient Criteria Technical Guidance Manual: Rivers and Streams - Environmental Protection Agency (EPA), accessed July 30, 2025
Nutrient Criteria Technical Guidance Manual: Rivers and Streams - Environmental Protection Agency (EPA), accessed July 30, 2025
Contextual Support Journal

Nutrient Criteria Technical Guidance Manual: Rivers and Streams - Environmental Protection Agency (EPA), accessed August 17, 2025,

View Source
Preview of Preliminary information for developing sediment guidelines for streams of the West Coast, New Zealand - Envirolink, accessed August 17, 2025,
Preliminary information for developing sediment guidelines for streams of the West Coast, New Zealand - Envirolink, accessed August 17, 2025,
Contextual Support Journal

Preliminary information for developing sediment guidelines for streams of the West Coast, New Zealand - Envirolink, accessed August 1, 2025,

View Source
Preview of Queensland Murray-Darling Freshwater Biogeographic Province 6 Water quality - WetlandInfo, accessed July 16, 2025,
Queensland Murray-Darling Freshwater Biogeographic Province 6 Water quality - WetlandInfo, accessed July 16, 2025,
Contextual Support Government

Queensland Murray-Darling Freshwater Biogeographic Province – Water quality - WetlandInfo

View Source
Preview of Reducing the impacts of grazing on water quality - EPA Victoria, accessed August 8, 2025
Reducing the impacts of grazing on water quality - EPA Victoria, accessed August 8, 2025
Contextual Support Journal

Generic document, accessed July 19, 2025,

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,
Contextual Support Journal

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

View Source
Preview of Requirements for graziers | Environment, land and water | Queensland Government, accessed July 30, 2025,
Requirements for graziers | Environment, land and water | Queensland Government, accessed July 30, 2025,
Contextual Support Government

Soil Health & Your Wealth - presented by Graeme Sait - Regional Development Australia, accessed July 30, 2025,

View Source
Preview of SA Arid Lands Landscape Regional Summary 2022 Aquatic ..., accessed July 30, 2025,
SA Arid Lands Landscape Regional Summary 2022 Aquatic ..., accessed July 30, 2025,
Contextual Support Government

(PDF) Effects of increasing salinity on freshwater ecosystems in ..., accessed July 31, 2025,

View Source
Preview of Sediments | AIMS - The Australian Institute of Marine Science, accessed July 30, 2025,
Sediments | AIMS - The Australian Institute of Marine Science, accessed July 30, 2025,
Contextual Support Government

Sediments | AIMS - The Australian Institute of Marine Science, accessed July 30, 2025,

View Source
Preview of Sustainable land management practices for graziers - NSW Department of Primary Industries, accessed August 8, 2025
Sustainable land management practices for graziers - NSW Department of Primary Industries, accessed August 8, 2025
Contextual Support Government

Sustainable land management practices for graziers - NSW Department of Primary Industries, accessed August 8, 2025

View Source
Preview of Water quality | Australia state of the environment 2021, accessed August 11, 2025,
Water quality | Australia state of the environment 2021, accessed August 11, 2025,
Contextual Support Government

Drivers of water quality in Afromontane-savanna rivers - Frontiers

View Source
Preview of Water quality and the grazing animal - PubMed, accessed July 30, 2025,
Water quality and the grazing animal - PubMed, accessed July 30, 2025,
Contextual Support Journal

Water quality and the grazing animal - PubMed, accessed July 10, 2025,

View Source
Preview of Water quality for farm water supplies | Managing dams - Agriculture Victoria, accessed August 1, 2025,
Water quality for farm water supplies | Managing dams - Agriculture Victoria, accessed August 1, 2025,
Contextual Support Government

Water quality for farm water supplies | Managing dams - Agriculture Victoria, accessed August 1, 2025,

View Source
Preview of Water quality for primary industries, accessed July 30, 2025,
Water quality for primary industries, accessed July 30, 2025,
Contextual Support Government

Development of regional water quality and catchment guidelines for the conservation of aquatic ecosystems - NSW Environment Protection Authority

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 WESTERN AUSTRALIAN WATER QUALITY GUIDELINES FOR FRESH AND MARINE WATERS - DBCA Library, accessed July 16, 2025,
WESTERN AUSTRALIAN WATER QUALITY GUIDELINES FOR FRESH AND MARINE WATERS - DBCA Library, accessed July 16, 2025,
Contextual Support Journal

WESTERN AUSTRALIAN WATER QUALITY ... - DBCA Library, accessed July 25, 2025,

View Source

Context

  • Region Australia
  • Biome Arid Mountain Ranges & Uplands
  • Land Use Livestock Grazing & Pasture
  • Assessment Pristine Reference
  • Evidence Type ReferenceCondition

Lifecycle

  • Status Active
  • Version 1
  • Effective From 14 Mar 2026

Notes

Optimal range is asymmetric, from near zero turbidity up to 15 NTU.

Related Benchmarks

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

— NTU Moderate
Livestock Grazing & Pasture · Pristine Reference
OptimalRange Active v1
25 NTU Moderate
Livestock Grazing & Pasture · Pristine Reference
UpperThreshold Active v1
— NTU Moderate
Livestock Grazing & Pasture · Conservation Target
OptimalRange Active v1