Water Electrical Conductivity (EC)

AUS-TSW-AGR-WEC General High confidence

Benchmark Value

No specific value — see range

Range: 125 to 2200 µS/cm

Optimal Range: 125 to 2200

Direction: Higher is desirable ↑

Form: OptimalRange

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 15 benchmarks together — the OptimalRange form drives the primary score, while 14 guard(s) constrain the result.

Contributing Benchmarks

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

Evidence & Context

The ANZECC (2000) guidelines provide default trigger values for various indicators for different geographical regions and ecosystem types, intended for use when locally-derived reference data is unavailable. For freshwater aquatic ecosystems in South-East Australia, the guidelines distinguish between upland and lowland rivers, with the dividing line set at an altitude of 150 meters. This distinction is important as much of the target biome, including the Riverina and Mallee cropping zones, falls within the lowland river classification.2 The default trigger values for electrical conductivity are presented as a range, reflecting the natural variability within these systems.

Metric Definition:

Electrical conductivity (EC) is a fundamental measure of water quality, serving as a robust proxy for the total concentration of dissolved ionic substances, or salts.

Benchmark Definition:

This benchmark represents the natural variability range of water electrical conductivity in lowland rivers within the temperate semi-arid shrublands and open woodlands biome, serving as a reference for ecological protection in agricultural landscapes.

Justification:

The ANZECC (2000) guidelines provide the most appropriate starting point. The target landscape falls within the 'slightly to moderately disturbed' ecosystem category. The default trigger value range for EC for lowland rivers in South-East Australia is 125–2200 µS/cm, representing the natural variability and ecological protection thresholds.

Sources (1)

Preview of ANZECC & ARMCANZ (2000) guidelines - Water Quality Australia, accessed August 12, 2025

ANZECC & ARMCANZ (2000) guidelines - Water Quality Australia, accessed August 12, 2025 Government

ANZECC & ARMCANZ (2000) guidelines - Water Quality Australia

Supporting Sources (25)

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,

Contextual Support Direct Evidence Journal

Effects of increasing salinity on freshwater ecosystems in Australia - ResearchGate

Preview of (PDF) The Impact of Extreme Low Flows on the Water Quality of the Lower Murray River and Lakes (South Australia) - ResearchGate, accessed May 10, 2025,

(PDF) The Impact of Extreme Low Flows on the Water Quality of the Lower Murray River and Lakes (South Australia) - ResearchGate, accessed May 10, 2025,

Contextual Support Journal

Water in mining and industry

Preview of (PDF) Water quality in two Australian dryland rivers: spatial and temporal variability and the role of flow - ResearchGate, accessed July 30, 2025,

(PDF) Water quality in two Australian dryland rivers: spatial and temporal variability and the role of flow - ResearchGate, accessed July 30, 2025,

Contextual Support

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

Preview of Accessory Publication Relative salinity tolerance of macroinvertebrates from the Barwon River, Victoria, Australia

Accessory Publication Relative salinity tolerance of macroinvertebrates from the Barwon River, Victoria, Australia

Contextual Support Journal

Pine Creek, near Dutton 2010 Aquatic Ecosystem Condition Report - EPA SA

Preview of All About Salinity - Environment and Heritage, accessed August 11, 2025

All About Salinity - Environment and Heritage, accessed August 11, 2025

Contextual Support

Impacts of salinity | Environment, land and water - Queensland Government, accessed July 28, 2025

Preview of ANZECC & ARMCANZ (2000) guidelines - Water Quality Australia

ANZECC & ARMCANZ (2000) guidelines - Water Quality Australia

Contextual Support GreyLiterature

ANZECC & ARMCANZ (2000) guidelines - Water Quality Australia, accessed July 9, 2025,

Preview of Australian and New Zealand Guidelines for Fresh and Marine Water ..., accessed July 9, 2025,

Australian and New Zealand Guidelines for Fresh and Marine Water ..., accessed July 9, 2025,

Methodology Source Government

Understanding Your Irrigation Water Test Report - Oklahoma State University Extension, accessed July 9, 2025,

Preview of Australian and New Zealand Guidelines for Fresh and Marine Water Quality - EPA, accessed July 9, 2025,

Australian and New Zealand Guidelines for Fresh and Marine Water Quality - EPA, accessed July 9, 2025,

Direct Evidence Journal

Australian and New Zealand Guidelines for Fresh and Marine Water Quality - EPA, accessed July 9, 2025,

Preview of Avon River - Healthy Rivers, accessed July 9, 2025,

Avon River - Healthy Rivers, accessed July 9, 2025,

Contextual Support Government

Avon River - Healthy Rivers, accessed July 9, 2025,

Preview of Can Rainwater Harvesting Enhance Your Garden Irrigation Strategy?, accessed July 9, 2025,

Can Rainwater Harvesting Enhance Your Garden Irrigation Strategy?, accessed July 9, 2025,

Contextual Support GreyLiterature

Can Rainwater Harvesting Enhance Your Garden Irrigation Strategy?, accessed July 9, 2025,

Preview of Challenges and adaptation needs for water quality in the Murray-Darling Basin in response to climate change - Australian Academy of Technological Sciences and Engineering (ATSE), accessed July 21, 2025

Challenges and adaptation needs for water quality in the Murray-Darling Basin in response to climate change - Australian Academy of Technological Sciences and Engineering (ATSE), accessed July 21, 2025

Direct Evidence Journal

Salinity - Murray–Darling Basin Authority

Preview of Dealing with Salinity in Wheatbelt Valleys - Processes, Prospects and Practical Options - Western Australian Government, accessed July 9, 2025,

Dealing with Salinity in Wheatbelt Valleys - Processes, Prospects and Practical Options - Western Australian Government, accessed July 9, 2025,

Contextual Support Journal

Review of Climate Change Impacts on Water Quantity and Quality in the Murray–Darling Basin, Australia - MDPI, accessed July 9, 2025,

Preview of Desertification in Australia: Definition, Causes and Environmental Impact - Access EP, accessed July 13, 2025,

Desertification in Australia: Definition, Causes and Environmental Impact - Access EP, accessed July 13, 2025,

Contextual Support GreyLiterature

Gully mapping and drivers in the grazing lands of the Burdekin ..., accessed July 21, 2025,

Preview of Effects of irrigating with saline water on soil structure - Agriculture Victoria, accessed July 9, 2025,

Effects of irrigating with saline water on soil structure - Agriculture Victoria, accessed July 9, 2025,

Contextual Support Government

Understanding salinity thresholds in freshwater biodiversity: freshwater to saline transition., accessed July 9, 2025,

Preview of Impacts of deep open drains on water quality and biodiversity of receiving waterways in the Wheatbelt of Western Australia - Murdoch Research Portal, accessed July 9, 2025,

Impacts of deep open drains on water quality and biodiversity of receiving waterways in the Wheatbelt of Western Australia - Murdoch Research Portal, accessed July 9, 2025,

Contextual Support Journal

Impacts of deep open drains on water quality and biodiversity of receiving waterways in the Wheatbelt of Western Australia - Murdoch Research Portal, accessed July 9, 2025,

Preview of Impacts of salinity | Environment, land and water - Queensland Government, accessed July 9, 2025,

Impacts of salinity | Environment, land and water - Queensland Government, accessed July 9, 2025,

Contextual Support Journal

Impacts of salinity | Environment, land and water - Queensland Government, accessed July 9, 2025,

Preview of Impacts of salinity | Environment, land and water - Queensland Government, accessed May 13, 2025,

Impacts of salinity | Environment, land and water - Queensland Government, accessed May 13, 2025,

Contextual Support Government

What can electrical conductivity tell us about our soil? - Trace and Save, accessed July 28, 2025

Preview of Irrigation salinity – causes and impacts | NSW Department of Primary Industries, accessed July 9, 2025,

Irrigation salinity – causes and impacts | NSW Department of Primary Industries, accessed July 9, 2025,

Contextual Support

Groundwater trends in the central agricultural region - DPIRD's Digital library, accessed July 9, 2025,

Preview of Irrigation Water Quality Criteria - 0.506 - CSU Extension - Colorado State University

Irrigation Water Quality Criteria - 0.506 - CSU Extension - Colorado State University

Contextual Support Government

Irrigation Water Quality Criteria - 0.506 - CSU Extension - Colorado State University, accessed July 9, 2025,

Preview of Multi-decadal trends in large-bodied fish populations in the New South Wales Murray–Darling Basin, Australia - CSIRO Publishing

Multi-decadal trends in large-bodied fish populations in the New South Wales Murray–Darling Basin, Australia - CSIRO Publishing

Contextual Support Journal

Multi-decadal trends in large-bodied fish populations in the New South Wales Murray–Darling Basin, Australia - CSIRO Publishing

Preview of Regenerative Agriculture—A Literature Review on the Practices and Mechanisms Used to Improve Soil Health - MDPI, accessed August 5, 2025,

Regenerative Agriculture—A Literature Review on the Practices and Mechanisms Used to Improve Soil Health - MDPI, accessed August 5, 2025,

Contextual Support Journal

Regenerative Agriculture—A Literature Review on the Practices and Mechanisms Used to Improve Soil Health - MDPI, accessed August 28, 2025,

Preview of Salinity - Murray–Darling Basin Authority, accessed August 11, 2025,

Salinity - Murray–Darling Basin Authority, accessed August 11, 2025,

Direct Evidence Government

Basin Plan water quality targets; Australian and New Zealand Guidelines for Fresh and Marine Water Quality (ANZG 2018/ANZECC 2000); Australia State of the Environment 2021: Inland water

Preview of Soil Health | Natural Resources Conservation Service - USDA, accessed May 13, 2025,

Soil Health | Natural Resources Conservation Service - USDA, accessed May 13, 2025,

Contextual Support Government

Australian dryland soils are acidic and nutrient-depleted, and have ..., accessed July 29, 2025

Preview of Which material can be used to reduce electrical conductivity of soil? And what are the disadvantages when electrical conductivity of soil increases ? | ResearchGate, accessed July 9, 2025,

Which material can be used to reduce electrical conductivity of soil? And what are the disadvantages when electrical conductivity of soil increases ? | ResearchGate, accessed July 9, 2025,

Contextual Support GreyLiterature

UNDERSTANDING YOUR STEP BY STEP Cath Botta - Goulburn ...

Preview of Why measure Electrical Conductivity (EC) in soil? - SoilSense, accessed July 9, 2025,

Why measure Electrical Conductivity (EC) in soil? - SoilSense, accessed July 9, 2025,

Contextual Support GreyLiterature

Why measure Electrical Conductivity (EC) in soil? - SoilSense, accessed July 10, 2025,

Context

Region Australia
Biome Temperate Semi-Arid Shrublands & Open Woodlands
Land Use Agricultural Crop Production
Assessment Pristine Reference
Evidence Type ReferenceCondition

Lifecycle

Status Active
Version 1
Effective From 20 Mar 2026

Notes

This range reflects the natural variability within the biome and serves as the foundational ecological reference against which agricultural system performance should be judged.

Related Benchmarks

Other benchmarks in the AUS-TSW-AGR-WEC family.