Water Electrical Conductivity (EC)

AUS-TSW-AGR-WEC General High confidence

Benchmark Value

800 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 2 benchmarks together — the MaximumOnly form drives the primary score, while 1 guard(s) constrain the result.

Contributing Benchmarks

MaximumOnly Primary MaximumOnly Guard

Evidence & Context

A benchmark for the "best available condition" should represent a state of high function and low stress for all components of the agro-ecosystem. It should reflect a condition where water salinity is not a limiting factor for either sustainable crop production or ecological health. Based on the synthesis of evidence, the most appropriate benchmark is one that aligns with the conservative management targets of major authorities and sits comfortably within the optimal functional range. The Murray-Darling Basin Authority's classification of water with an EC < 800 µS/cm as "low salinity" provides a scientifically sound and operationally relevant benchmark.

Metric Definition:

Water Electrical Conductivity (EC) in surface water used for agricultural crop production in temperate semi-arid shrublands and open woodlands.

Benchmark Definition:

This benchmark defines the maximum acceptable water electrical conductivity (EC) level in surface water for agricultural crop production in temperate semi-arid shrublands and open woodlands, reflecting a threshold to avoid salinity stress on crops and aquatic ecosystems.

Justification:

The benchmark is justified by synthesizing agronomic thresholds for crop tolerance, ecological thresholds for aquatic life protection, and soil health thresholds to prevent structural damage.

Sources (4)

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

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, GreyLiterature

Gully mapping and drivers in the grazing lands of the Burdekin ...

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

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

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

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

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

Salinity | Murray–Darling Basin Authority

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,

Contextual Support Direct Evidence GreyLiterature

(PDF) 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

Shifting Goalposts: Setting Restoration Targets for Waterbirds in the Murray-Darling Basin Under Climate Change - Frontiers, accessed July 9, 2025

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

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

Australian and New Zealand Guidelines for Fresh and Marine Water ..., 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

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)

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

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

Recommended Measurements for Scaling Soil Health Assessment

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

Irrigation salinity – causes and impacts | NSW Department of Primary Industries, 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 July 20, 2025,

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 Conservation Target
Evidence Type TargetCondition

Lifecycle

Status Active
Version 1
Effective From 5 Jun 2026

Notes

Lower Critical Threshold: 250 µS/cm. Upper Detrimental Threshold: 1500 µS/cm. The optimal functional range for water EC is 250 – 800 µS/cm. Below 250 µS/cm, there is a severe risk of soil structural damage due to clay dispersion in sodic soils. Above 1500 µS/cm, adverse effects on sensitive aquatic biota occur. The benchmark of <800 µS/cm aligns with the Murray-Darling Basin Authority's 'low salinity' classification, protecting both soil and aquatic ecosystem health while supporting crop production.