Water Electrical Conductivity (EC)

AUS-AIF-URB-WEC General High confidence

Benchmark Value

500 µS/cm

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 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 benchmark of < 500 µS/cm is proposed as the reference value for high environmental health.

Metric Definition:

Water Electrical Conductivity (EC) in urbanised arid inland waterways

Benchmark Definition:

This benchmark represents the maximum electrical conductivity level in urbanised arid inland waterways that supports high environmental health, protecting sensitive life stages of keystone species and maintaining ecological integrity.

Justification:

This value is protective of the critical recruitment phase of Murray Cod larvae and supports diverse macroinvertebrate communities.

Sources (4)

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

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

View Source

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

Australian Water Quality Guidelines for Fresh and Marine Waters 1992 Journal

Basin Salinity Management 2030 – strategies and reports

View Source

Quarterly Drinking Water Quality Report - Essential Water

Quarterly Drinking Water Quality Report - Essential Water

View Source

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, GreyLiterature

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

View Source

Supporting Sources (20)

Additional references from the underlying research that informed this benchmark.

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

Direct Evidence

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

View Source

(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

View Source

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

Direct Evidence Government

Salinity - Murray–Darling Basin Authority

View Source

Australia | Request PDF - ResearchGate

Contextual Support Journal

central Australia | Request PDF - ResearchGate

View Source

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

View Source

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

Regulatory Framework Journal

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

View Source

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.

View Source

Australian Water Quality Guidelines for Fresh and Marine Waters 1992

Contextual Support GreyLiterature

Australian Water Quality Guidelines for Fresh and Marine Waters 1992

View Source

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

View Source

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

View Source

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,

View Source

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

View Source

New sensitivity grades for Australian river macroinvertebrates - ResearchGate

Direct Evidence Journal

New sensitivity grades for Australian river macroinvertebrates - ResearchGate

View Source

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

Direct Evidence

Murray to Broken Hill pipeline | NSW Government Water

View Source

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

View Source

Salinity - Murray�darling Basin Authority

Contextual Support Journal

Salinity - Murray–Darling Basin Authority

View Source

Urban Water in the Murray-Darling Basin - DCCEEW

Contextual Support Journal

Urban Water in the Murray-Darling Basin - DCCEEW

View Source

Using the ANZECC Guidelines and Water Quality Objectives in NSW, accessed August 11, 2025,

Contextual Support Journal

Reference-site data - Water Quality Australia

View Source

Water quality of surface water environments - NSW Government Water, accessed August 1, 2025,

Contextual Support Government

National Guidelines for Water Quality | Department of Natural ...

View Source

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

Contextual Support Journal

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

View Source

Context

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

Lifecycle

Status Superseded
Version 1
Effective From 4 Jun 2026
Effective To 4 Jun 2026

Notes

This benchmark is well below the general ecosystem degradation threshold of 1500 µS/cm and the MDBA's management target of <800 µS/cm, representing a state of high ecological health. It is also above the potential lower critical threshold for ion deficiency of 125 µS/cm, which is the lower bound of the ANZG guideline range for lowland rivers, creating an optimal management range of 125-500 µS/cm. The benchmark is technically achievable, as demonstrated by treated water quality in arid urban centres like Broken Hill. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.

Related Benchmarks

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