Water Turbidity

AUS-TGP-CON-WTU General Moderate 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. The scoring engine uses 11 benchmarks together — the OptimalRange form drives the primary score, while 10 guard(s) constrain the result.

Contributing Benchmarks

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

Evidence & Context

Ideally, samples should have <5 NTU turbidity

Metric Definition:

Turbidity is formally defined as an optical measure of water clarity, quantifying the degree to which light is scattered by suspended particles.

Benchmark Definition:

An 'ideal' value for achieving good-to-excellent water quality and protecting sensitive aquatic fauna.

Justification:

Derived from a peer-reviewed study of Victorian mountain streams, which are analogous to the high-integrity headwater systems within the target biome, and corroborated by the ACT Waterwatch program and ANZECC (2000) guidelines.

Sources (1)

Preview of An Examination of Stream Water Quality Data from Monitoring of Forest Harvesting in the Eastern Highlands of Victoria - MDPI, accessed August 1, 2025,

An Examination of Stream Water Quality Data from Monitoring of Forest Harvesting in the Eastern Highlands of Victoria - MDPI, accessed August 1, 2025, Journal

An Examination of Stream Water Quality Data from Monitoring of Forest Harvesting in the Eastern Highlands of Victoria.

Supporting Sources (30)

Additional references from the underlying research that informed this benchmark.

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

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,

Direct Evidence Journal

Assessing water quality - ACT Waterwatch.

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,

Contextual Support Government

Australian Alps Liaison Committee (AALC). (2011). Caring for our Australian Alps catchments: A climate change action strategy. Department of Climate Change and Energy Efficiency.

Preview of Bioregions and EVC benchmarks - Environment, accessed August 5, 2025,

Bioregions and EVC benchmarks - Environment, accessed August 5, 2025,

Contextual Support Government

TASVEG VCA Manual: A manual for assessing vegetation condition in Tasmania, Version 2.0. Natural and Cultural Heritage, Department of

Preview of Catchment Health Indicator Program - Upper Murrumbidgee Waterwatch, accessed August 12, 2025,

Catchment Health Indicator Program - Upper Murrumbidgee Waterwatch, accessed August 12, 2025,

Contextual Support Journal

Catchment Health Indicator Program Report 2021 - Upper Murrumbidgee Waterwatch, accessed August 12, 2025

Preview of Catchment Health Indicator Program Report 2021 - Upper Murrumbidgee Waterwatch, accessed August 12, 2025,

Catchment Health Indicator Program Report 2021 - Upper Murrumbidgee Waterwatch, accessed August 12, 2025,

Contextual Support Journal

ANZECC/ARMCANZ (2000) Guidelines

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 Clarity and colour - WetlandInfo, accessed August 12, 2025,

Clarity and colour - WetlandInfo, accessed August 12, 2025,

Contextual Support Methodology Source Government

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

Preview of Effects of suspended sediment on freshwater fish Envirolink Advice Grant: 1445-WCRC129, accessed August 12, 2025,

Effects of suspended sediment on freshwater fish Envirolink Advice Grant: 1445-WCRC129, accessed August 12, 2025,

Contextual Support Journal

Effects of turbidity on the feeding ability of the juvenile migrant stage of six New Zealand freshwater fish species, accessed July 16, 2025

Preview of Feral horses (Equus caballus) increase suspended sediment in subalpine streams, accessed August 12, 2025,

Feral horses (Equus caballus) increase suspended sediment in subalpine streams, accessed August 12, 2025,

Contextual Support Direct Evidence Journal

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

Preview of Grey Box (Eucalyptus microcarpa) Grassy Woodlands and Derived Native Grasslands of South-eastern Australia, accessed August 10, 2025,

Grey Box (Eucalyptus microcarpa) Grassy Woodlands and Derived Native Grasslands of South-eastern Australia, accessed August 10, 2025,

Contextual Support

Is there a close association between 'soils' and 'vegetation'? A case study from central western New South Wales, accessed August 4, 2025,

Preview of Kosciuszko National Park water quality monitoring, accessed August 12, 2025,

Kosciuszko National Park water quality monitoring, accessed August 12, 2025,

Contextual Support Government

theaustralianalpsnationalparks.org, accessed August 17, 2025

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

Preview of Natural Temperate Grassland of the Southern Tablelands of NSW and the Australian Capital Territory. - DCCEEW, accessed August 12, 2025,

Natural Temperate Grassland of the Southern Tablelands of NSW and the Australian Capital Territory. - DCCEEW, accessed August 12, 2025,

Contextual Support Government

NVIS Fact sheet MVG 19 Tussock grasslands, accessed August 6, 2025

Preview of Review of water quality studies in the Australian Alps, accessed August 12, 2025,

Review of water quality studies in the Australian Alps, accessed August 12, 2025,

Contextual Support Government

Feral horses (Equus caballus) increase suspended sediment in subalpine streams

Preview of River water quality: clarity and turbidity – published April 2019 | Stats NZ, accessed August 12, 2025,

River water quality: clarity and turbidity – published April 2019 | Stats NZ, accessed August 12, 2025,

Contextual Support Government

River water quality: clarity and turbidity – published April 2019 | Stats NZ, accessed August 12, 2025

Preview of SL314/SS526: Water Quality Notes: Water Clarity (Turbidity, Suspended Solids, and Color) - UF/IFAS EDIS, accessed August 12, 2025,

SL314/SS526: Water Quality Notes: Water Clarity (Turbidity, Suspended Solids, and Color) - UF/IFAS EDIS, accessed August 12, 2025,

Contextual Support Methodology Source GreyLiterature

SL314/SS526: Water Quality Notes: Water Clarity (Turbidity, Suspended Solids, and Color) - UF/IFAS EDIS, accessed August 12, 2025

Preview of Surface water quality - Bioregional Assessments |, accessed August 12, 2025,

Surface water quality - Bioregional Assessments |, accessed August 12, 2025,

Contextual Support Direct Evidence Government

Water Quality Objectives - Border Rivers - NSW Government, accessed August 17, 2025

Preview of The Environmental Impact of High Turbidity Levels in Water Bodies - BOQU Instrument, accessed August 12, 2025,

The Environmental Impact of High Turbidity Levels in Water Bodies - BOQU Instrument, accessed August 12, 2025,

Contextual Support GreyLiterature

The Environmental Impact of High Turbidity Levels in Water Bodies - BOQU Instrument, accessed August 12, 2025,

Preview of The Turbidity Effect: How Water Clarity Impacts Ecosystems - Number Analytics, accessed August 12, 2025,

The Turbidity Effect: How Water Clarity Impacts Ecosystems - Number Analytics, accessed August 12, 2025,

Contextual Support GreyLiterature

The Turbidity Effect: How Water Clarity Impacts Ecosystems - Number Analytics, accessed August 12, 2025,

Preview of Turbidity - Cumberland River Compact, accessed August 12, 2025,

Turbidity - Cumberland River Compact, accessed August 12, 2025,

Contextual Support GreyLiterature

The Impact of Turbidity on Aquatic Life: Insights From Turbidity Meters - BOQU Instrument, accessed July 31, 2025,

Preview of Turbidity and Water | U.S. Geological Survey - USGS.gov, accessed August 12, 2025,

Turbidity and Water | U.S. Geological Survey - USGS.gov, accessed August 12, 2025,

Contextual Support

An Examination of Stream Water Quality Data from Monitoring of ..., accessed July 31, 2025,

Preview of Victorian Water Quality Analysis 2022 Technical Report - Water and ..., accessed August 12, 2025,

Victorian Water Quality Analysis 2022 Technical Report - Water and ..., accessed August 12, 2025,

Contextual Support Journal

Victorian Water Quality Analysis 2022 Technical Report

Preview of Water quality - Healthy Waterways Strategy, accessed August 11, 2025,

Water quality - Healthy Waterways Strategy, accessed August 11, 2025,

Contextual Support Government

Australian guidelines for water quality monitoring and reporting

Preview of Water quality data and reports - EPA Victoria, accessed August 12, 2025,

Water quality data and reports - EPA Victoria, accessed August 12, 2025,

Contextual Support Government

Water quality data and reports - EPA Victoria

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 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 ...

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 ...

Preview of Why Measure Turbidity? - Montclair State University, accessed August 12, 2025,

Why Measure Turbidity? - Montclair State University, accessed August 12, 2025,

Contextual Support GreyLiterature

Why Measure Turbidity? - Montclair State University, accessed July 31, 2025,

Preview of www.montclair.edu, accessed August 12, 2025,

www.montclair.edu, accessed August 12, 2025,

Contextual Support GreyLiterature

ANZECC & ARMCANZ (2000) guidelines - Water Quality Australia, accessed August 12, 2025

Context

Region Australia
Biome Temperate Grassy Woodlands & Plains
Land Use Conservation / Protected Natural Areas
Assessment Pristine Reference
Evidence Type ReferenceCondition

Lifecycle

Status Active
Version 1
Effective From 30 May 2026

Notes

This benchmark represents the ideal turbidity for achieving good-to-excellent water quality in high-integrity, minimally disturbed upland streams within Australia's Temperate Grassy Woodlands & Plains biome under conservation management.

Related Benchmarks

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