Water Electrical Conductivity (EC)

AUS-AKW-LVG-WEC General Moderate confidence

Benchmark Value

3000 μS/cm

Thresholds: Lower: —, Upper: 3000

Direction: Higher 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 9 benchmarks together — the OptimalRange form drives the primary score, while 8 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary MaximumOnly Guard OptimalRange Guard OptimalRange Guard MaximumOnly Guard Point Guard MaximumOnly Guard MaximumOnly Guard MinimumOnly Guard

Evidence & Context

Based on the proxy analysis of the best available groundwater data, the proposed reference value for Water Electrical Conductivity (EC) representing the "best available condition" in Australia's Arid Karstic Woodlands & Shrublands under sustainable livestock grazing is < 3,000 μS/cm.

Metric Definition:

Water Electrical Conductivity (EC) representing the "best available condition" in Australia's Arid Karstic Woodlands & Shrublands under sustainable livestock grazing

Benchmark Definition:

This benchmark represents the best available natural condition for Water Electrical Conductivity (EC) in Australia's Arid Karstic Woodlands & Shrublands under sustainable livestock grazing, based on proxy groundwater data indicating a maximum EC of 3,000 μS/cm.

Justification:

It is derived from the upper limit of the best-quality water zone (< 2,000 mg/L TDS or ~3,125 μS/cm) identified in the most comprehensive hydrogeological survey of the specific pastoral region. This represents the lowest natural salinity baseline achievable in the managed landscape, providing a conservative and precautionary benchmark.

Sources (1)

Preview of Nullarbor bioregion - DCCEEW, accessed July 27, 2025

Nullarbor bioregion - DCCEEW, accessed July 27, 2025 Journal

(PDF) Soil potassium—crop response calibration relationships and ..., accessed July 24, 2025

Supporting Sources (31)

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 Journal

Effects of increasing salinity on freshwater ecosystems in Australia - ResearchGate

Preview of A review of water quality studies relevant to northern Australia - CSIRO, accessed July 21, 2025,

A review of water quality studies relevant to northern Australia - CSIRO, accessed July 21, 2025,

Contextual Support Journal

Salinity and water quality

Preview of An Adaptive Management Framework for Connected Groundwater, accessed July 25, 2025,

An Adaptive Management Framework for Connected Groundwater, accessed July 25, 2025,

Contextual Support Government

An Adaptive Management Framework for Connected Groundwater, accessed July 25, 2025,

Preview of Anatomical Response of Atriplex Leaves under Different Levels of Sodium Chloride Salinity - Journal of Plant Production Sciences, accessed July 25, 2025,

Anatomical Response of Atriplex Leaves under Different Levels of Sodium Chloride Salinity - Journal of Plant Production Sciences, accessed July 25, 2025,

Contextual Support Journal

Anatomical Response of Atriplex Leaves under Different Levels of Sodium Chloride Salinity - Journal of Plant Production Sciences, accessed July 25, 2025,

Preview of Atriplex vesicaria - Wikipedia, accessed July 25, 2025,

Atriplex vesicaria - Wikipedia, accessed July 25, 2025,

Contextual Support GreyLiterature

Atriplex vesicaria - Wikipedia, accessed July 25, 2025,

Preview of Barwon Darling and Far Western Water Quality Objectives explained - NSW Government, accessed July 25, 2025,

Barwon Darling and Far Western Water Quality Objectives explained - NSW Government, accessed July 25, 2025,

Contextual Support Journal

Nullarbor Plain - A biography of the Australian continent

Preview of Can simple, on-ground vegetation and soil measures reliably indicate the health of rangelands? An application in Australia's semi-arid woodlands - CSIRO Publishing, accessed July 30, 2025

Can simple, on-ground vegetation and soil measures reliably indicate the health of rangelands? An application in Australia's semi-arid woodlands - CSIRO Publishing, accessed July 30, 2025

Contextual Support Journal

on-ground vegetation and soil measures reliably indicate the health of rangelands? An application in Australia's semi-arid woodlands - CSIRO Publishing

Preview of Categories - Water quality - CSIRO Data Access Portal, accessed July 16, 2025,

Categories - Water quality - CSIRO Data Access Portal, accessed July 16, 2025,

Contextual Support Government

Water Quality Data Home, accessed July 25, 2025,

Preview of DRAFT Regional groundwater chemistry zones: SEQ region ..., accessed July 25, 2025,

DRAFT Regional groundwater chemistry zones: SEQ region ..., accessed July 25, 2025,

Contextual Support GreyLiterature

TERN Supersite - Australian Landscape Trust, accessed July 27, 2025

Preview of Dryland salinity in Western Australia | Agriculture and Food, accessed July 25, 2025,

Dryland salinity in Western Australia | Agriculture and Food, accessed July 25, 2025,

Contextual Support Government

Dryland salinity in Western Australia | Agriculture and Food, accessed July 25, 2025,

Preview of Groundwater Contamination in Karst Regions Affects Human Health - Eos.org, accessed July 25, 2025,

Groundwater Contamination in Karst Regions Affects Human Health - Eos.org, accessed July 25, 2025,

Contextual Support Journal

(PDF) Review of Groundwater Pollution and Protection in Karst Areas - ResearchGate, accessed July 25, 2025,

Preview of Groundwater in Australia, accessed July 25, 2025

Groundwater in Australia, accessed July 25, 2025

Contextual Support Journal

Thermal anomaly and water origin in Weebubbie Cave, Nullarbor Karst Plain, Australia, accessed July 25, 2025,

Preview of Karst Groundwater Systems: a brief overview - ACKMA 1973 - 2011, accessed July 27, 2025

Karst Groundwater Systems: a brief overview - ACKMA 1973 - 2011, accessed July 27, 2025

Contextual Support

What is a groundwater dependent ecosystem? - Arid Lands Environment Centre, accessed July 25, 2025,

Preview of Karst wetlands - WetlandInfo, accessed July 26, 2025,

Karst wetlands - WetlandInfo, accessed July 26, 2025,

Contextual Support Journal

Karst wetlands - WetlandInfo, accessed July 26, 2025,

Preview of Maireana sedifolia at San Marcos Growers, accessed July 25, 2025,

Maireana sedifolia at San Marcos Growers, accessed July 25, 2025,

Contextual Support Journal

Maireana sedifolia at San Marcos Growers, accessed July 25, 2025,

Preview of National Guidelines for Water Quality - Department of Natural Resources and Environment Tasmania, accessed July 25, 2025,

National Guidelines for Water Quality - Department of Natural Resources and Environment Tasmania, accessed July 25, 2025,

Contextual Support GreyLiterature

Predicting Shifts in Australian Shrublands with Changing Climates and Land Uses - Forest Service

Preview of Nullarbor Karst - The Western Australian Speleological Group, accessed July 25, 2025,

Nullarbor Karst - The Western Australian Speleological Group, accessed July 25, 2025,

Contextual Support Journal

An Overall Perspective for the Study of Emerging Contaminants in Karst Aquifers - MDPI, accessed July 25, 2025,

Preview of Nullarbor Plain - Wikipedia, accessed July 25, 2025,

Nullarbor Plain - Wikipedia, accessed July 25, 2025,

Contextual Support GreyLiterature

Nullarbor Plain - Wikipedia, accessed July 24, 2025

Preview of NVIS Fact sheet MVG 22 – Chenopod shrublands, samphire shrublands and forblands - DCCEEW, accessed July 24, 2025

NVIS Fact sheet MVG 22 – Chenopod shrublands, samphire shrublands and forblands - DCCEEW, accessed July 24, 2025

Contextual Support Journal

Some Characteristics of Calcareous soils. A review A.S. Taalab1, G.W. Ageeb2, Hanan S. Siam1 and Safaa A. Mahmoud1 - CURRENT RESEARCH WEB, accessed July 26, 2025,

Preview of River & stream water quality monitoring - Washington State Department of Ecology, accessed July 25, 2025,

River & stream water quality monitoring - Washington State Department of Ecology, accessed July 25, 2025,

Contextual Support Government

Water Quality Data | Pierce County, WA - Official Website, accessed July 25, 2025,

Preview of Salinity and water quality, accessed July 25, 2025,

Salinity and water quality, accessed July 25, 2025,

Contextual Support

Salinity and water quality, accessed July 25, 2025,

Preview of Show Plant - eHALOPH, accessed July 25, 2025,

Show Plant - eHALOPH, accessed July 25, 2025,

Contextual Support GreyLiterature

Show Plant - eHALOPH, accessed July 25, 2025,

Preview of The piosphere revisited: plant species patterns close to waterpoints in small, fenced paddocks in chenopod shrublands of South Australia - Bohrium, accessed July 25, 2025,

The piosphere revisited: plant species patterns close to waterpoints in small, fenced paddocks in chenopod shrublands of South Australia - Bohrium, accessed July 25, 2025,

Contextual Support Journal

The piosphere revisited: plant species patterns close to waterpoints in small, fenced paddocks in chenopod shrublands of South Australia - Bohrium, accessed July 25, 2025,

Preview of Thermal anomaly and water origin in Weebubbie Cave, Nullarbor Karst Plain, Australia, accessed July 26, 2025,

Thermal anomaly and water origin in Weebubbie Cave, Nullarbor Karst Plain, Australia, accessed July 26, 2025,

Contextual Support Journal

Salinity tolerance in irrigated crops - NSW Department of Primary Industries, accessed July 25, 2025,

Preview of Using the ANZECC Guidelines and Water Quality Objectives in NSW, accessed July 25, 2025,

Using the ANZECC Guidelines and Water Quality Objectives in NSW, accessed July 25, 2025,

Regulatory Framework Government

Using the ANZECC Guidelines and Water Quality Objectives in NSW, accessed July 25, 2025,

Preview of Water - CSIRO, accessed July 16, 2025,

Water - CSIRO, accessed July 16, 2025,

Contextual Support Government

A review of water quality studies relevant to northern Australia - CSIRO, accessed July 25, 2025,

Preview of Water for livestock: interpreting water quality tests | NSW Department of Primary Industries, accessed July 25, 2025,

Water for livestock: interpreting water quality tests | NSW Department of Primary Industries, accessed July 25, 2025,

Contextual Support Government

Water quality for farm water supplies | Managing dams - Agriculture Victoria

Preview of Water quality guidelines - Queensland Environment Department, accessed August 1, 2025,

Water quality guidelines - Queensland Environment Department, accessed August 1, 2025,

Contextual Support Government

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

Preview of Water quality standards, accessed July 25, 2025,

Water quality standards, accessed July 25, 2025,

Contextual Support

Water quality standards, accessed July 25, 2025,

Preview of Water-remoteness for grazing relief in Australian arid-lands - ResearchGate, accessed July 25, 2025,

Water-remoteness for grazing relief in Australian arid-lands - ResearchGate, accessed July 25, 2025,

Contextual Support GreyLiterature

Water-remoteness for grazing relief in Australian arid-lands - ResearchGate, accessed July 25, 2025,

Preview of WB867 MKS Flora and Veg V5g 20180703 - EPA WA, accessed July 25, 2025,

WB867 MKS Flora and Veg V5g 20180703 - EPA WA, accessed July 25, 2025,

Contextual Support Government

WB867 MKS Flora and Veg V5g 20180703 - EPA WA, accessed July 25, 2025,

Context

Region Australia
Biome Arid Karstic Woodlands & Shrublands
Land Use Livestock Grazing & Pasture
Assessment Pristine Reference
Evidence Type ReferenceCondition

Lifecycle

Status Active
Version 1
Effective From 19 Mar 2026

Notes

This value is a proxy based on the highest quality (least saline) groundwater found in the target biome under pastoral land use (< 2,000 mg/L TDS, equivalent to ~3,125 μS/cm). Direct surface water data is unavailable. The ecosystem is saline-adapted, and extremely low EC would be an unnatural disturbance. The optimal range is the stable, natural saline regime of a site, likely ranging from < 3,000 to ~8,000 μS/cm in healthy areas. The upper detrimental threshold is not a fixed EC value but is reached when anthropogenic activities alter salinity beyond the ecosystem's natural adaptive range, causing ecological degradation.