Water Turbidity

AUS-TSR-CON-WTU General High confidence

Benchmark Value

5 NTU

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.

Evidence & Context

A significant upper detrimental threshold exists at approximately 5 NTU, a point at which severe stress is observed in key freshwater and marine organisms.

Metric Definition:

Upper detrimental turbidity threshold beyond which severe ecological stress occurs in key aquatic organisms.

Benchmark Definition:

This threshold marks the turbidity level above which severe ecological stress and declines in sensitive aquatic species occur in tropical rainforest freshwater and marine environments.

Justification:

Supported by studies on Great Barrier Reef corals and freshwater macroinvertebrates showing severe stress above this turbidity.

Sources (1)

Preview of Temporal dynamics in coral bioindicators for water quality on coastal coral reefs of the Great Barrier Reef - CSIRO Publishing, accessed July 22, 2025

Temporal dynamics in coral bioindicators for water quality on coastal coral reefs of the Great Barrier Reef - CSIRO Publishing, accessed July 22, 2025 Journal

Determining Tipping Points and Responses of Macroinvertebrate ...

Supporting Sources (28)

Additional references from the underlying research that informed this benchmark.

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 A Compendium of Ecological Information on Australia's Northern Tropical Rivers - Report 5 - Water quality - DCCEEW, accessed August 1, 2025,

A Compendium of Ecological Information on Australia's Northern Tropical Rivers - Report 5 - Water quality - DCCEEW, accessed August 1, 2025,

Contextual Support Journal

Threshold Indicator Taxa ANalysis and change points (dots) for the ...

Preview of Australian and New Zealand Guidelines for Fresh and Marine Water Quality (2000) - V, accessed July 22, 2025

Australian and New Zealand Guidelines for Fresh and Marine Water Quality (2000) - V, accessed July 22, 2025

Contextual Support Journal

1.5.2.1 Surface water - Bioregional Assessments |

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

Turbidity | Australia state of the environment 2021

Preview of Determining Tipping Points and Responses of Macroinvertebrate Traits to Abiotic Factors in Support of River Management - PubMed Central, accessed July 16, 2025,

Determining Tipping Points and Responses of Macroinvertebrate Traits to Abiotic Factors in Support of River Management - PubMed Central, accessed July 16, 2025,

Direct Evidence Journal

Determining Tipping Points and Responses of Macroinvertebrate Traits to Abiotic Factors in Support of River Management. Water, 15(8), 1589.

Preview of Full article: Relationships between algal primary productivity and environmental variables in tropical floodplain wetlands - Taylor & Francis Online, accessed August 2, 2025,

Full article: Relationships between algal primary productivity and environmental variables in tropical floodplain wetlands - Taylor & Francis Online, accessed August 2, 2025,

Contextual Support

Phytoplankton primary production in the world's estuarine-coastal ecosystems - BG, accessed August 2, 2025

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

Preview of Queensland Reef Water Quality Program | Environment, land and water, accessed August 3, 2025,

Queensland Reef Water Quality Program | Environment, land and water, accessed August 3, 2025,

Contextual Support Government

Queensland Reef Water Quality Program | Environment, land and water, accessed August 2, 2025,

Preview of Queensland Water Quality Guidelines 2009, accessed July 21, 2025,

Queensland Water Quality Guidelines 2009, accessed July 21, 2025,

Contextual Support Journal

Queensland Aquaculture Strategy 2024–2034

Preview of Reef Water Quality Report Card 2020 Great Barrier Reef Marine Monitoring Program Methods, accessed July 22, 2025

Reef Water Quality Report Card 2020 Great Barrier Reef Marine Monitoring Program Methods, accessed July 22, 2025

Contextual Support Journal

Reef Water Quality Report Card 2020 Great Barrier Reef Marine Monitoring Program Methods, accessed July 22, 2025

Preview of Regional report cards | Reef 2050 Water Quality Improvement Plan, accessed July 21, 2025,

Regional report cards | Reef 2050 Water Quality Improvement Plan, accessed July 21, 2025,

Contextual Support Government

Regional report cards | Reef 2050 Water Quality Improvement Plan, accessed July 21, 2025,

Preview of REPORT CARD 2024 - Wet Tropics Waterways, accessed July 22, 2025

REPORT CARD 2024 - Wet Tropics Waterways, accessed July 22, 2025

Contextual Support Journal

REPORT CARD 2024 - Wet Tropics Waterways, accessed July 22, 2025

Preview of Report Card Explainer - Reef 2050 Water Quality Improvement Plan, accessed August 2, 2025,

Report Card Explainer - Reef 2050 Water Quality Improvement Plan, accessed August 2, 2025,

Contextual Support Journal

Report Card Explainer - Reef 2050 Water Quality Improvement Plan, accessed August 2, 2025,

Preview of Results - Wet Tropics Waterways, accessed July 22, 2025

Results - Wet Tropics Waterways, accessed July 22, 2025

Contextual Support

Results - Wet Tropics Waterways, accessed July 22, 2025

Preview of Science in Water Quality - Reef & Rainforest Research Centre, accessed August 2, 2025,

Science in Water Quality - Reef & Rainforest Research Centre, accessed August 2, 2025,

Contextual Support

Science in Water Quality - Reef & Rainforest Research Centre, accessed July 22, 2025,

Preview of Spatiotemporal variability of light attenuation and net ecosystem metabolism in a back-barrier estuary, accessed July 22, 2025

Spatiotemporal variability of light attenuation and net ecosystem metabolism in a back-barrier estuary, accessed July 22, 2025

Contextual Support Journal

Spatiotemporal variability of light attenuation and net ecosystem metabolism in a back-barrier estuary, accessed July 22, 2025

Preview of Tour TERN's rainforest monitoring SuperSite | TERN Australia, accessed July 22, 2025

Tour TERN's rainforest monitoring SuperSite | TERN Australia, accessed July 22, 2025

Contextual Support Government

Robson Creek Flux Data Release 2022_v2 - TERN Data Discovery Portal

Preview of Towards environmental management of water turbidity within open coastal waters of the Great Barrier Reef - PubMed, accessed July 22, 2025

Towards environmental management of water turbidity within open coastal waters of the Great Barrier Reef - PubMed, accessed July 22, 2025

Contextual Support Journal

Towards environmental management of water turbidity within open coastal waters of the Great Barrier Reef - PubMed, accessed July 22, 2025

Preview of Turbidity | Australian Drinking Water Guidelines - NHMRC, accessed August 11, 2025,

Turbidity | Australian Drinking Water Guidelines - NHMRC, accessed August 11, 2025,

Contextual Support Government

Turbidity | Australian Drinking Water Guidelines - NHMRC, accessed August 3, 2025

Preview of Turbidity and light attenuation in coastal waters of the Great Barrier Reef - ResearchOnline@JCU, accessed August 2, 2025,

Turbidity and light attenuation in coastal waters of the Great Barrier Reef - ResearchOnline@JCU, accessed August 2, 2025,

Contextual Support Journal

Turbidity and light attenuation in coastal waters of the Great Barrier Reef - ResearchOnline@JCU

Preview of Turbidity and light attenuation in coastal waters of the Great Barrier Reef, accessed July 22, 2025

Turbidity and light attenuation in coastal waters of the Great Barrier Reef, accessed July 22, 2025

Contextual Support GreyLiterature

Turbidity and light attenuation in coastal waters of the Great Barrier Reef, accessed July 22, 2025

Preview of Underwater Light Characteristics of Turbid Coral Reefs of the Inner Central Great Barrier Reef - Frontiers, accessed July 22, 2025

Underwater Light Characteristics of Turbid Coral Reefs of the Inner Central Great Barrier Reef - Frontiers, accessed July 22, 2025

Contextual Support Journal

Underwater Light Characteristics of Turbid Coral Reefs of the Inner Central Great Barrier Reef - Frontiers, accessed July 22, 2025

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)

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,

Contextual Support Journal

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

Preview of Water-quality and ecosystem impacts of recreation in streams: Monitoring and management, accessed July 22, 2025

Water-quality and ecosystem impacts of recreation in streams: Monitoring and management, accessed July 22, 2025

Contextual Support Journal

Using the ANZECC Guidelines and Water Quality Objectives in NSW, accessed July 19, 2025,

Preview of Waterhouse, J. (2010) Thresholds of major pollutants with regard to ..., accessed July 22, 2025

Waterhouse, J. (2010) Thresholds of major pollutants with regard to ..., accessed July 22, 2025

Contextual Support Journal

Waterhouse, J. (2010) Thresholds of major pollutants with regard to impacts on instream and marine ecosystems, accessed July 21, 2025,

Preview of wet tropics report card 2024 - waterway environment results, accessed August 2, 2025,

wet tropics report card 2024 - waterway environment results, accessed August 2, 2025,

Direct Evidence GreyLiterature

Report Card Explainer - Reef 2050 Water Quality Improvement Plan, accessed August 2, 2025

Preview of wet tropics report card 2024 - waterway environment results, accessed July 18, 2025,

wet tropics report card 2024 - waterway environment results, accessed July 18, 2025,

Contextual Support

Wet Tropics Waterways Report Card 2022-23 Results

Context

Region Australia
Biome Tropical & Subtropical Rainforests
Land Use Conservation / Protected Natural Areas
Assessment Not Stated
Evidence Type DegradationThreshold

Lifecycle

Status Active
Version 1
Effective From 1 Jun 2026

Notes

Sustained median turbidity above 5 NTU indicates a degraded ecosystem state and ecological tipping point. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.

Related Benchmarks

Other benchmarks in the AUS-TSR-CON-WTU family.