Water Electrical Conductivity (EC)

AUS-AIF-URB-WEC General High confidence

Benchmark Value

1500 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

1500 µS/cm is defined as the upper detrimental threshold. Water quality exceeding this level indicates a system that is likely to be experiencing significant ecological harm, including the loss of sensitive species and the disruption of key ecosystem functions.

Metric Definition:

Upper detrimental threshold of water electrical conductivity (EC) above which widespread adverse biological effects occur

Benchmark Definition:

This benchmark represents the upper detrimental electrical conductivity level above which significant ecological harm occurs in urbanised arid inland waterways.

Justification:

Supported by multiple major scientific reviews and guidelines, including ANZECC (1992) and subsequent reviews.

Sources (3)

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, 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 GreyLiterature

Australian Water Quality Guidelines for Fresh and Marine Waters 1992

View Source
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, Government

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

View Source

Supporting Sources (21)

Additional references from the underlying research that informed this benchmark.

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

View Source
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

View Source
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

View Source
Preview of Australia | Request PDF - ResearchGate
Australia | Request PDF - ResearchGate
Contextual Support Journal

central Australia | Request PDF - ResearchGate

View Source
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

View Source
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)
Regulatory Framework Journal

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

View Source
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.

View Source
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

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
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

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
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

View Source
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

View Source
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

View Source
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

View Source
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

View Source
Preview of Salinity - Murray�darling Basin Authority
Salinity - Murray�darling Basin Authority
Contextual Support Journal

Salinity - Murray–Darling Basin Authority

View Source
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)

View Source
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

View Source
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

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

Lifecycle

  • Status Active
  • Version 2
  • Effective From 4 Jun 2026

Notes

This threshold marks the transition from a stressed to a significantly degraded freshwater ecosystem. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.

Related Benchmarks

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

125 µS/cm Moderate
Urban & Developed Use · Not Stated
MinimumOnly Active v1
— µS/cm High
Urban & Developed Use · Not Stated
OptimalRange Active v1
500 µS/cm High
Urban & Developed Use · Not Stated
MaximumOnly Superseded v1