Water Electrical Conductivity (EC)

AUS-AMR-IND-WEC General High confidence

Benchmark Value

42 μS/cm
Range: 42 to 42 μS/cm
Thresholds: Lower: —, Upper: 1500
Optimal Range: 42 to 42
Direction: Higher is desirable ↑
Form: Point

Scoring Curve

Scoring curve unavailable

The scoring engine could not generate a curve for this benchmark context. The primary form is CompositeFramework, but the benchmark data may be missing required fields (e.g., optimal range bounds for an OptimalRange benchmark). This is typically a data quality issue in the benchmark pipeline.

Contributing Benchmarks

CompositeFramework Primary LowerThreshold Guard UpperThreshold Guard Point Guard MinimumOnly Guard Point Guard OptimalRange Guard UpperThreshold Guard Point Guard MaximumOnly Guard MinimumOnly Guard MaximumOnly Guard Point Guard Point Guard

Evidence & Context

The resulting 42 ³S/cm value is not an arbitrary number; it is a scientifically derived threshold directly linked to a biological protection goal.

Metric Definition:

Water Electrical Conductivity (EC)

Benchmark Definition:

This benchmark represents a scientifically derived water quality threshold for industrial land use in Australian arid upland regions, indicating a level of electrical conductivity at which water quality is functionally indistinguishable from natural background and poses negligible risk to aquatic life.

Justification:

It was calculated to be protective of 99% of local aquatic species and is designed to ensure any water quality changes from industrial operations remain within the bounds of natural variability, consistent with a management goal of 'no change in biodiversity'.

Sources (2)

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, Journal

Effects of increasing salinity on freshwater ecosystems in Australia - ResearchGate

View Source
Preview of Revised Ranger Mine Water Quality Objectives for Magela Creek and Gulungul Creek
Revised Ranger Mine Water Quality Objectives for Magela Creek and Gulungul Creek
View Source

Supporting Sources (24)

Additional references from the underlying research that informed this benchmark.

Preview of 1.5.2.1 Surface water - Bioregional Assessments |, accessed August 1, 2025
1.5.2.1 Surface water - Bioregional Assessments |, accessed August 1, 2025
Contextual Support GreyLiterature

Geophysics foundations: Physical properties: Electrical resistivity of geologic materials - UBC EOAS, accessed August 1, 2025

View Source
Preview of 1.5.2.1 Surface water - Bioregional Assessments |, accessed August 11, 2025,
1.5.2.1 Surface water - Bioregional Assessments |, accessed August 11, 2025,
Contextual Support Government

Water Quality Objectives - Border Rivers - NSW Government, accessed August 1, 2025

View Source
Preview of A GUIDE TO THE APPLICATION OF THE ANZECC ... - ResearchGate, accessed August 11, 2025,
A GUIDE TO THE APPLICATION OF THE ANZECC ... - ResearchGate, accessed August 11, 2025,
Methodology Source GreyLiterature

Namoi River Water Quality Objectives explained - NSW Government

View Source
Preview of An environmental flow to an ephemeral creek increases the input of carbon and nutrients to a downstream receiving river, accessed July 27, 2025,
An environmental flow to an ephemeral creek increases the input of carbon and nutrients to a downstream receiving river, accessed July 27, 2025,
Contextual Support

River Health in the Flinders Ranges - EPA SA, accessed August 1, 2025

View Source
Preview of Aquatic ecosystems in post-mining landscapes: Technical paper, accessed August 1, 2025
Aquatic ecosystems in post-mining landscapes: Technical paper, accessed August 1, 2025
Methodology Source GreyLiterature

Aquatic ecosystems in post-mining landscapes: Technical paper, accessed August 1, 2025

View Source
Preview of Assessing discharges from a uranium mine 64 case study - Water Quality Australia, accessed August 1, 2025
Assessing discharges from a uranium mine 64 case study - Water Quality Australia, accessed August 1, 2025
Contextual Support Journal

Assessing discharges from a uranium mine 64 case study - Water Quality Australia, accessed August 1, 2025

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,
Contextual Support Journal

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

View Source
Preview of Central Pilbara Water Resource Management Plan - EPA WA, accessed August 1, 2025
Central Pilbara Water Resource Management Plan - EPA WA, accessed August 1, 2025
Contextual Support Journal

Central Pilbara Water Resource Management Plan - EPA WA, accessed August 1, 2025

View Source
Preview of environment.nt.gov.au, accessed May 11, 2025,
environment.nt.gov.au, accessed May 11, 2025,
Contextual Support Journal

Water Quality objectives for the region - Department of Lands, Planning and Environment

View Source
Preview of Environmental impacts of uranium mining in Australia, accessed August 1, 2025
Environmental impacts of uranium mining in Australia, accessed August 1, 2025
Contextual Support Journal

Environmental impacts of uranium mining in Australia, accessed August 1, 2025

View Source
Preview of Establishing closure targets for discharge to temporary waters 64 a review - Australian Centre for Geomechanics, accessed August 1, 2025
Establishing closure targets for discharge to temporary waters 64 a review - Australian Centre for Geomechanics, accessed August 1, 2025
Contextual Support Journal

Establishing closure targets for discharge to temporary waters 64 a review - Australian Centre for Geomechanics, accessed August 1, 2025

View Source
Preview of Guidelines for the management of water in mines and quarries - Resources Victoria, accessed July 24, 2025
Guidelines for the management of water in mines and quarries - Resources Victoria, accessed July 24, 2025
Contextual Support Government

Eastern Pilbara Water Resources Management Plan - EPA WA, accessed August 1, 2025

View Source
Preview of Long 2Term Monitoring of Macroinvertebrate Communities Over 2,300 km of the Murray River Reveals Ecological Signs of Salinity, accessed August 1, 2025
Long 2Term Monitoring of Macroinvertebrate Communities Over 2,300 km of the Murray River Reveals Ecological Signs of Salinity, accessed August 1, 2025
Contextual Support Journal

Salinity as a major influence on groundwater microbial communities in agricultural landscapes - CSIRO Publishing, accessed August 1, 2025

View Source
Preview of Pilbara - BHP, accessed August 1, 2025
Pilbara - BHP, accessed August 1, 2025
Contextual Support Government

Water - BHP, accessed August 1, 2025

View Source
Preview of Quantifying Health in Ephemeral Rivers - eWater, accessed July 20, 2025,
Quantifying Health in Ephemeral Rivers - eWater, accessed July 20, 2025,
Contextual Support Journal

An environmental flow to an ephemeral creek increases the input of carbon and nutrients to a downstream receiving river, accessed August 1, 2025

View Source
Preview of Revised Ranger Mine Water Quality Objectives for Magela Creek ..., accessed July 24, 2025
Revised Ranger Mine Water Quality Objectives for Magela Creek ..., accessed July 24, 2025
Direct Evidence Government

Regulatory Statement: Monitoring of Electrical Conductivity in the Beetaloo Sub 2basin, accessed August 1, 2025

View Source
Preview of Snap happy: camera traps are an effective sampling tool when compared with alternative methods | Royal Society Open Science - Journals, accessed July 27, 2025
Snap happy: camera traps are an effective sampling tool when compared with alternative methods | Royal Society Open Science - Journals, accessed July 27, 2025
Contextual Support Journal

Electrical Conductivity (EC25) and TDS - Lake Superior Streams, accessed August 1, 2025

View Source
Preview of The Ecological and Hydrological Significance of Ephemeral and Intermittent Streams in the Arid and Semi-arid American Southwest - Environmental Protection Agency (EPA)
The Ecological and Hydrological Significance of Ephemeral and Intermittent Streams in the Arid and Semi-arid American Southwest - Environmental Protection Agency (EPA)
Contextual Support Journal

The Phosphorus Buffering Index – What Does it Mean for Your Soil? - Summit Fertilizers, accessed July 17, 2025,

View Source
Preview of The Relationship between Electrical Conductivity and Selected Macroinvertebrate Communities in Four River Systems of South-West Victoria, Australia - ResearchGate
The Relationship between Electrical Conductivity and Selected Macroinvertebrate Communities in Four River Systems of South-West Victoria, Australia - ResearchGate
Contextual Support Journal

The Relationship between Electrical Conductivity and Selected Macroinvertebrate Communities in Four River Systems of South-West Victoria, Australia - ResearchGate

View Source
Preview of understanding the new anzecc water quality guidelines - Environmetrics Australia, accessed May 11, 2025,
understanding the new anzecc water quality guidelines - Environmetrics Australia, accessed May 11, 2025,
Contextual Support

Australian and New Zealand Guidelines for Fresh and Marine Water Quality (2000), accessed August 1, 2025

View Source
Preview of Water Data SA – Available Data - WaterConnect, accessed July 27, 2025,
Water Data SA – Available Data - WaterConnect, accessed July 27, 2025,
Contextual Support Journal

Water Data SA 62 Available Data - WaterConnect, accessed August 1, 2025

View Source
Preview of Water quality guidelines - Queensland Environment Department, accessed August 4, 2025,
Water quality guidelines - Queensland Environment Department, accessed August 4, 2025,
Contextual Support Journal

Salinity | Murray–Darling Basin Authority, accessed August 8, 2025,

View Source
Preview of Water Quality Protection Guidelines No. 6 - Government of Western Australia, accessed August 1, 2025
Water Quality Protection Guidelines No. 6 - Government of Western Australia, accessed August 1, 2025
Regulatory Framework Journal

Water Quality Protection Guidelines No. 6 - Government of Western Australia, accessed August 1, 2025

View Source
Preview of WATER STEWARDSHIP - Leading Practice Sustainable ..., accessed August 1, 2025
WATER STEWARDSHIP - Leading Practice Sustainable ..., accessed August 1, 2025
Contextual Support Journal

14-Month Water Quality Investigation of Coal Mine Discharge on Two Rivers in NSW, Australia: Implications for Environmental Regulation - ResearchGate, accessed August 1, 2025

View Source

Context

  • Region Australia
  • Biome Arid Mountain Ranges & Uplands
  • Land Use Industrial & Infrastructure Use
  • Assessment Pristine Reference
  • Evidence Type ReferenceCondition

Lifecycle

  • Status Active
  • Version 1
  • Effective From 24 Mar 2026

Notes

This benchmark represents the 'best-on-offer' real-world example of high environmental health for industrial land use in an Australian arid upland setting. The concept of a lower critical threshold is not applicable. The risk from industrial impacts in this context is exclusively from increasing EC above the natural baseline. Adverse effects on aquatic biota are expected above ~1500 μS/cm, with significant impairment of fundamental ecosystem processes (microbial activity) occurring above 3000 μS/cm.