Water Electrical Conductivity (EC)

AUS-AIF-URB-WEC General Moderate confidence

Benchmark Value

125 µS/cm

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 10 benchmarks together — the OptimalRange form drives the primary score, while 9 guard(s) constrain the result.

Contributing Benchmarks

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

Evidence & Context

A value of < 125 µS/cm is consequently proposed as the lower critical threshold, representing an unnaturally low level of dissolved solids that could induce osmotic stress in local fauna.

Metric Definition:

Lower critical threshold of water electrical conductivity (EC) below which osmotic stress and ion deficiency may occur in aquatic fauna

Benchmark Definition:

This benchmark represents the minimum electrical conductivity level below which aquatic organisms may experience osmotic stress due to ion deficiency in urbanised arid inland waterways.

Justification:

Based on the lower bound of the ANZG (2000) default trigger range for lowland rivers and physiological considerations of ionoregulation in freshwater fauna.

Sources (2)

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

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

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

Preview of Water-Quality-Salinity-Standards.pdf, accessed August 11, 2025,

Water-Quality-Salinity-Standards.pdf, accessed August 11, 2025, Journal

(PDF) Effects of increasing salinity on freshwater ecosystems in ..., accessed July 21, 2025

Supporting Sources (22)

Additional references from the underlying research that informed this benchmark.

Preview of (PDF) Effects of increasing salinity on freshwater ecosystems in Australia - ResearchGate, accessed August 11, 2025,

(PDF) Effects of increasing salinity on freshwater ecosystems in Australia - ResearchGate, accessed August 11, 2025,

Direct Evidence GreyLiterature

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

Preview of (PDF) Targets for Urban Stormwater Management in Australia - ResearchGate

(PDF) Targets for Urban Stormwater Management in Australia - ResearchGate

Direct Evidence

(PDF) Targets for Urban Stormwater Management in Australia - ResearchGate

Preview of (PDF) Water Sensitive Urban Design - Case Studies (Australia/Dubai) - ResearchGate, accessed July 13, 2025,

(PDF) Water Sensitive Urban Design - Case Studies (Australia/Dubai) - ResearchGate, accessed July 13, 2025,

Direct Evidence GreyLiterature

WATER- SENSITIVE URBAN DESIGN AND PLANNING - Centre for Science and Environment

Preview of ANZEC Guidelines - Risk Assessment for Contaminated Sites in New Zealand, accessed July 18, 2025,

ANZEC Guidelines - Risk Assessment for Contaminated Sites in New Zealand, accessed July 18, 2025,

Direct Evidence Government

Salinity - Murray–Darling Basin Authority

Preview of Australia | Request PDF - ResearchGate

Australia | Request PDF - ResearchGate

Contextual Support Journal

central Australia | Request PDF - ResearchGate

Preview of Australian and New Zealand Guidelines for Fresh and Marine Water Quality

Australian and New Zealand Guidelines for Fresh and Marine Water Quality

Contextual Support Journal

WESTERN AUSTRALIAN WATER QUALITY GUIDELINES FOR FRESH AND MARINE WATERS - DBCA Library

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

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

Direct Evidence Journal

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

Preview of Australian Water Quality Guidelines for Fresh and Marine Waters 1992

Australian Water Quality Guidelines for Fresh and Marine Waters 1992

Contextual Support Journal

Basin Salinity Management 2030 – strategies and reports

Preview of Australian Water Quality Guidelines for Fresh and Marine Waters 1992

Australian Water Quality Guidelines for Fresh and Marine Waters 1992

Contextual Support GreyLiterature

Australian Water Quality Guidelines for Fresh and Marine Waters 1992

Preview of Effectiveness of Water-Sensitive Urban Design Techniques on Stormwater Quantity Management at a Residential Allotment Scale - MDPI, accessed August 2, 2025,

Effectiveness of Water-Sensitive Urban Design Techniques on Stormwater Quantity Management at a Residential Allotment Scale - MDPI, accessed August 2, 2025,

Contextual Support

Effectiveness of Water-Sensitive Urban Design Techniques on Stormwater Quantity Management at a Residential Allotment Scale - MDPI, accessed August 11, 2025

Preview of Gardens and Public Open Space Irrigation: A Case Study in Perth - Scientific Research Publishing

Gardens and Public Open Space Irrigation: A Case Study in Perth - Scientific Research Publishing

Contextual Support

National Guidelines for Water Quality - Department of Natural Resources and Environment Tasmania

Preview of Management of major ions in freshwater ecosystems: thresholds of impact and indicators of change - UQ eSpace - The University of Queensland, accessed August 17, 2025,

Management of major ions in freshwater ecosystems: thresholds of impact and indicators of change - UQ eSpace - The University of Queensland, accessed August 17, 2025,

Contextual Support GreyLiterature

Comparison of two commonly used methods for identifying water ..., accessed August 8, 2025,

Preview of New sensitivity grades for Australian river macroinvertebrates - Murray-Darling Freshwater Research Centre

New sensitivity grades for Australian river macroinvertebrates - Murray-Darling Freshwater Research Centre

Contextual Support Journal

AECR - 2016 panel assessment of creeks and rivers from the Adelaide and MLR NRM region - EPA SA, accessed July 13, 2025

Preview of New sensitivity grades for Australian river macroinvertebrates - ResearchGate

New sensitivity grades for Australian river macroinvertebrates - ResearchGate

Direct Evidence Journal

New sensitivity grades for Australian river macroinvertebrates - ResearchGate

Preview of Quarterly Drinking Water Quality Report - Essential Water

Quarterly Drinking Water Quality Report - Essential Water

Contextual Support

Quarterly Drinking Water Quality Report - Essential Water

Preview of Quarterly Drinking Water Quality Report Broken ... - Essential Water

Quarterly Drinking Water Quality Report Broken ... - Essential Water

Direct Evidence

Murray to Broken Hill pipeline | NSW Government Water

Preview of River Murray �darling to Sea Ecological Community: Expert Technical Workshop Report - DCCEEW

River Murray �darling to Sea Ecological Community: Expert Technical Workshop Report - DCCEEW

Direct Evidence Journal

River Murray �darling to Sea Ecological Community: Expert Technical Workshop Report - DCCEEW

Preview of Salinity - Murray�darling Basin Authority

Salinity - Murray�darling Basin Authority

Contextual Support Journal

Salinity - Murray–Darling Basin Authority

Preview of Salinity sensitivity in early life stages of an Australian freshwater fish, Murray Cod (Maccullochella peelii peelii Mitchell 1838) - University of Canberra Research Portal, accessed August 11, 2025,

Salinity sensitivity in early life stages of an Australian freshwater fish, Murray Cod (Maccullochella peelii peelii Mitchell 1838) - University of Canberra Research Portal, accessed August 11, 2025,

Contextual Support GreyLiterature

Salinity sensitivity in early life stages of an Australian freshwater fish, Murray Cod (Maccullochella peelii peelii Mitchell 1838)

Preview of Urban Water in the Murray-Darling Basin - DCCEEW

Urban Water in the Murray-Darling Basin - DCCEEW

Contextual Support Journal

Urban Water in the Murray-Darling Basin - DCCEEW

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

Reference-site data - Water Quality Australia

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 ...

Context

Region Australia
Biome Arid Inland Floodplains & Ephemeral River Systems
Land Use Urban & Developed Use
Assessment Not Stated
Evidence Type DegradationThreshold

Lifecycle

Status Active
Version 1
Effective From 4 Jun 2026

Notes

This threshold is important in highly engineered urban water systems where advanced treatment can produce unnaturally low EC water. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.

Related Benchmarks

Other benchmarks in the AUS-AIF-URB-WEC family.