Water Turbidity

AUS-TSW-URB-WTU General Moderate confidence

Benchmark Value

10 NTU

Range: 0 to 25 NTU

Thresholds: Lower: —, Upper: 25

Optimal Range: 0 to 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 6 benchmarks together — the OptimalRange form drives the primary score, while 5 guard(s) constrain the result.

Contributing Benchmarks

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

Evidence & Context

Therefore, a turbidity level of < 10 NTU is proposed as the benchmark representing the best available condition for surface waters in urban and developed areas within Australia's Temperate Semi-Arid Shrublands & Open Woodlands.

Metric Definition:

Water turbidity measured in Nephelometric Turbidity Units (NTU), indicating water clarity affected by suspended and dissolved materials.

Benchmark Definition:

This benchmark represents the maximum turbidity level of 10 NTU for surface waters in urban and developed areas of Australia's Temperate Semi-Arid Shrublands & Open Woodlands, indicating good water clarity and ecological health.

Justification:

The benchmark of < 10 NTU is derived by synthesizing evidence from national guidelines, community-based thresholds, and real-world ecosystem condition assessments. It represents a state of 'good environmental water clarity' consistent with ecological condition ratings and national guideline ranges.

Sources (4)

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Assessing Water Quality - Secondary Education Years 9 to 12 - Upper Murrumbidgee Waterwatch, accessed August 12, 2025, Journal

Assessing water quality - ACT Waterwatch

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Australian and New Zealand Guidelines for Fresh and Marine Water Quality (2000), accessed May 11, 2025, Journal

Northern Territory Government (2020) Darwin Harbour Region Water Quality Objectives, Report Card Section 3.0.

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Brownhill Creek, Brownhill Creek Road near CFS track 2016 Aquatic Ecosystem Condition Report - EPA SA, accessed July 13, 2025, Government

Brownhill Creek, Brownhill Creek Road near CFS track 2016 Aquatic Ecosystem Condition Report - EPA SA, accessed July 13, 2025,

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Urban Streams Monitoring Program - City of Bellingham, accessed July 13, 2025, Government

Urban Streams Monitoring Program - City of Bellingham, accessed July 13, 2025,

Supporting Sources (34)

Additional references from the underlying research that informed this benchmark.

Preview of 1.1.7.1 Ecological systems | Bioregional Assessments, accessed July 13, 2025,

1.1.7.1 Ecological systems | Bioregional Assessments, accessed July 13, 2025,

Contextual Support Government

NVIS Fact sheet MVG 19 – Tussock grasslands, accessed July 13, 2025

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act practice guidelines for water sensitive urban design - Planning, accessed July 13, 2025,

Contextual Support Journal

act practice guidelines for water sensitive urban design - Planning, accessed July 13, 2025,

Preview of Ambient Water Quality Monitoring of South Australia's Rivers and Streams - EPA SA, accessed July 13, 2025,

Ambient Water Quality Monitoring of South Australia's Rivers and Streams - EPA SA, accessed July 13, 2025,

Contextual Support Journal

Ambient Water Quality Monitoring of South Australia's Rivers and Streams - EPA SA, accessed July 13, 2025,

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Appendix 13 – Water Reports - NET, accessed July 13, 2025,

Contextual Support Journal

Appendix 13 – Water Reports - NET, accessed July 13, 2025,

Preview of Bayswater Brook Catchment - City of Bayswater, accessed July 13, 2025,

Bayswater Brook Catchment - City of Bayswater, accessed July 13, 2025,

Contextual Support Government

Bayswater Brook Catchment - City of Bayswater, accessed July 13, 2025,

Preview of Brownhill Creek, Brownhill Creek Road 2016 Aquatic Ecosystem Condition Report | EPA, accessed July 13, 2025,

Brownhill Creek, Brownhill Creek Road 2016 Aquatic Ecosystem Condition Report | EPA, accessed July 13, 2025,

Contextual Support Direct Evidence Government

Brownhill Creek, Brownhill Creek Road 2016 Aquatic Ecosystem Condition Report | EPA, accessed July 13, 2025,

Preview of Catchment to Coast (metropolitan Adelaide) | EPA, accessed July 13, 2025,

Catchment to Coast (metropolitan Adelaide) | EPA, accessed July 13, 2025,

Contextual Support Government

Catchment to Coast (metropolitan Adelaide) | EPA, accessed July 13, 2025,

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

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DEVELOPING WATER QUALITY CRITERIA FOR SUSPENDED AND BEDDED SEDIMENTS (SABS) - NOAA Office for Coastal Management, accessed July 13, 2025,

Contextual Support Journal

DEVELOPING WATER QUALITY CRITERIA FOR SUSPENDED AND BEDDED SEDIMENTS (SABS) - NOAA Office for Coastal Management, accessed July 13, 2025,

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Draft environmental values and water quality guidelines: Burdekin Basin fresh and estuarine waters - Queensland Environment Department, accessed July 13, 2025,

Contextual Support Journal

Draft environmental values and water quality guidelines: Burdekin Basin fresh and estuarine waters - Queensland Environment Department, accessed July 13, 2025,

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Managing urban water - Department for Environment and Water, accessed July 13, 2025,

Contextual Support Government

Managing urban water - Department for Environment and Water, accessed July 13, 2025,

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Mardie Project – Marine Water Quality Baseline - EPA WA, accessed July 13, 2025,

Contextual Support Journal

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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 ...

Preview of NVIS Fact sheet MVG 13 – Acacia open woodlands - DCCEEW, accessed July 13, 2025,

NVIS Fact sheet MVG 13 – Acacia open woodlands - DCCEEW, accessed July 13, 2025,

Contextual Support Journal

NVIS Fact sheet MVG 13 Acacia open woodlands - DCCEEW, accessed July 10, 2025,

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Onkaparinga River, downstream from Mount Bold Reservoir 2011 Aquatic Ecosystem Condition Report - EPA SA, accessed July 13, 2025,

Contextual Support Government

Onkaparinga River, downstream from Mount Bold Reservoir 2011 Aquatic Ecosystem Condition Report - EPA SA, accessed July 13, 2025,

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Onkaparinga River, Woodside 2011 Aquatic Ecosystem Condition Report | EPA, accessed July 13, 2025,

Contextual Support Government

Onkaparinga River, Woodside 2011 Aquatic Ecosystem Condition Report | EPA, accessed July 13, 2025,

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Contextual Support Government

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Protecting drinking water quality into the future —priority areas and land use compatibility in Adelaide's Mount Lofty Ranges Watershed - epa.sa.gov.a, accessed July 13, 2025,

Contextual Support Journal

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Contextual Support Government

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Contextual Support Government

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Contextual Support Journal

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

Contextual Support Direct Evidence Government

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Turbidity | River Detectives, accessed July 16, 2025,

Contextual Support Journal

Turbidity | River Detectives, accessed July 27, 2025,

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Turbidity, accessed August 3, 2025,

Contextual Support Journal

Turbidity, accessed July 31, 2025,

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Urban Stormwater in Perth: Strengths Weaknesses and Recommendations for Future Management - Parliament of Western Australia, accessed July 13, 2025,

Contextual Support Journal

Urban Stormwater in Perth: Strengths Weaknesses and Recommendations for Future Management - Parliament of Western Australia, accessed July 13, 2025,

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Contextual Support Journal

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Contextual Support Journal

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Contextual Support Journal

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Water Sensitive Urban Design (WSUD), accessed July 13, 2025,

Contextual Support GreyLiterature

Water Sensitive Urban Design (WSUD), accessed July 13, 2025,

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Water sensitive urban design brochures - Government of Western Australia, accessed July 21, 2025,

Contextual Support Government

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Water sensitive urban design guideline June 2023 - Transport for NSW, accessed July 13, 2025,

Contextual Support Journal

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Water Sensitive Urban Design Guidelines - Melbourne Water, accessed July 21, 2025,

Contextual Support Journal

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Water Sensitive Urban Design Solutions for Catchments above Wetlands - Hunter Joint Organisation, accessed July 13, 2025,

Contextual Support Journal

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Contextual Support Journal

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Context

Region Australia
Biome Temperate Semi-Arid Shrublands & Open Woodlands
Land Use Urban & Developed Use
Assessment Pristine Reference
Evidence Type ReferenceCondition

Lifecycle

Status Active
Version 1
Effective From 15 Mar 2026

Notes

Lower Critical Threshold: None identified. Optimal turbidity range is 0-25 NTU. Upper Detrimental Threshold: 25 NTU.