Water Electrical Conductivity (EC)

AUS-AKW-CON-WEC General Moderate confidence

Benchmark Value

No specific value — see range

Range: 0 to 1500 μS/cm

Optimal Range: 0 to 1500

Direction: Lower 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 6 benchmarks together — the OptimalRange form drives the primary score, while 5 guard(s) constrain the result.

Contributing Benchmarks

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

Evidence & Context

The optimal range for high ecosystem health corresponds to the natural condition of freshwater lenses, considered to be < 1,500 μS/cm.

Metric Definition:

Optimal range of Water Electrical Conductivity (EC) representing natural freshwater lenses in the biome

Benchmark Definition:

This benchmark defines the optimal range of electrical conductivity in groundwater representing natural, high-quality freshwater lenses in the Arid Karstic Woodlands & Shrublands biome under conservation.

Justification:

Multiple independent sources converge on this quantitative definition for the optimal state of freshwater lenses.

Sources (2)

Preview of Conservation Advice for the Karst springs and associated alkaline fens of the Naracoorte Coastal Plain Bioregion

Conservation Advice for the Karst springs and associated alkaline fens of the Naracoorte Coastal Plain Bioregion Journal

Conservation Advice for the Karst springs and associated alkaline fens of the Naracoorte Coastal Plain Bioregion

Preview of DEPARTMENT OF MINES AND ENERGY SOUTH AUSTRALIA REPORT BOOK 96/10 MUSGRAVE PROCLAIMED WELLS AREA GROUNDWATER ASSESSMENT by A J L - NET

DEPARTMENT OF MINES AND ENERGY SOUTH AUSTRALIA REPORT BOOK 96/10 MUSGRAVE PROCLAIMED WELLS AREA GROUNDWATER ASSESSMENT by A J L - NET Journal

Water Affecting Activity Control Policy, accessed July 27, 2025

Supporting Sources (17)

Additional references from the underlying research that informed this benchmark.

Preview of (PDF) Subterranean Fauna of the Arid Zone - ResearchGate, accessed July 27, 2025,

(PDF) Subterranean Fauna of the Arid Zone - ResearchGate, accessed July 27, 2025,

Contextual Support GreyLiterature

How to Calculate Electrical Conductivity From TDS? - Rika Sensor, accessed July 27, 2025

Preview of Conductivity, TDS, Salinity, Resistivity - apera instruments, accessed July 20, 2025,

Conductivity, TDS, Salinity, Resistivity - apera instruments, accessed July 20, 2025,

Methodology Source Journal

Geological Control upon Groundwater Flow and Major Ion Chemistry with Influence on Basin Management in a Coastal Aquifer, South Australia - Scientific Research Publishing, accessed July 27, 2025

Preview of CONSULTATION INFORMATION PACK Establishing baseline data for the conservation of Koonalda Cave, accessed July 27, 2025,

CONSULTATION INFORMATION PACK Establishing baseline data for the conservation of Koonalda Cave, accessed July 27, 2025,

Contextual Support GreyLiterature

CONSULTATION INFORMATION PACK Establishing baseline data for the conservation of Koonalda Cave, accessed July 27, 2025

Preview of Eyre Peninsula Groundwater Dependent Ecosystem Scoping Study - Department for Environment and Water, accessed July 27, 2025,

Eyre Peninsula Groundwater Dependent Ecosystem Scoping Study - Department for Environment and Water, accessed July 27, 2025,

Contextual Support Journal

Eyre Peninsula Groundwater Dependent Ecosystem Scoping Study - Department for Environment and Water, accessed July 27, 2025

Preview of Geology of Australia | EBSCO Research Starters, accessed July 27, 2025,

Geology of Australia | EBSCO Research Starters, accessed July 27, 2025,

Contextual Support GreyLiterature

GSA Today - The evolution of end-member continental waters: The origin of acidity in southern Western Australia, accessed July 27, 2025

Preview of Guide to New South Wales Karst and Caves - Environment and Heritage, accessed July 25, 2025,

Guide to New South Wales Karst and Caves - Environment and Heritage, accessed July 25, 2025,

Contextual Support

The Nullarbor deserves better protection - La Trobe University, accessed July 27, 2025

Preview of Investigation on the groundwater resources of the South Eyre Peninsula, South Australia, determined from laterally constrained inversion of tempest data - ResearchGate, accessed July 27, 2025,

Investigation on the groundwater resources of the South Eyre Peninsula, South Australia, determined from laterally constrained inversion of tempest data - ResearchGate, accessed July 27, 2025,

Contextual Support GreyLiterature

Investigation on the groundwater resources of the South Eyre Peninsula, South Australia, determined from laterally constrained inversion of tempest data - ResearchGate, accessed July 27, 2025

Preview of Karst and agriculture in Australia - Digital Commons @ USF, accessed July 27, 2025,

Karst and agriculture in Australia - Digital Commons @ USF, accessed July 27, 2025,

Contextual Support Journal

Soil Management Systems to Overcome Multiple Constraints for Dryland Crops on Deep Sands in a Water Limited Environment on the South Coast of Western Australia - MDPI

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 Palaeovalley Groundwater Resources in Arid and Semi-Arid Australia, accessed July 27, 2025,

Palaeovalley Groundwater Resources in Arid and Semi-Arid Australia, accessed July 27, 2025,

Contextual Support Journal

Palaeovalley Groundwater Resources in Arid and Semi-Arid Australia, accessed July 27, 2025

Preview of Salinity tolerance of stygofauna at Mulga Downs Iron Ore Mine - EPA WA, accessed July 27, 2025,

Salinity tolerance of stygofauna at Mulga Downs Iron Ore Mine - EPA WA, accessed July 27, 2025,

Contextual Support Journal

Salinity tolerance of stygofauna at Mulga Downs Iron Ore Mine - EPA WA, accessed July 27, 2025

Preview of TDS and EC Conversion - Snowate, accessed July 27, 2025,

TDS and EC Conversion - Snowate, accessed July 27, 2025,

Methodology Source GreyLiterature

TDS and EC Conversion - Snowate, accessed July 27, 2025

Preview of The Nullarbor deserves better protection - La Trobe University, accessed July 26, 2025,

The Nullarbor deserves better protection - La Trobe University, accessed July 26, 2025,

Contextual Support GreyLiterature

Nullarbor Plains Xeric Shrublands | One Earth, accessed July 27, 2025

Preview of Total dissolved solids | Australian Drinking Water Guidelines - NHMRC, accessed July 27, 2025,

Total dissolved solids | Australian Drinking Water Guidelines - NHMRC, accessed July 27, 2025,

Contextual Support Government

Australian and New Zealand Guidelines for Fresh and Marine Water Quality

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

Conservation Advice for the Karst springs and associated alkaline fens of the Naracoorte Coastal Plain Bioregion, accessed July 27, 2025

Preview of Water in the region - Landscape South Australia - Alinytjara Wilurara, accessed July 27, 2025,

Water in the region - Landscape South Australia - Alinytjara Wilurara, accessed July 27, 2025,

Contextual Support Government

Falls in groundwater for southern Eyre Peninsula in South Australia force 2024 decision for plant to desalinate seawater | Adelaide AZ, accessed July 27, 2025

Preview of www.dcceew.gov.au, accessed July 27, 2025,

www.dcceew.gov.au, accessed July 27, 2025,

Contextual Support

www.dcceew.gov.au, accessed July 27, 2025

Context

Region Australia
Biome Arid Karstic Woodlands & Shrublands
Land Use Conservation / Protected Natural Areas
Assessment Pristine Reference
Evidence Type HealthyOperationalRange

Lifecycle

Status Active
Version 1
Effective From 4 Jun 2026

Notes

This range reflects the natural, high-quality state of critical groundwater resources in the biome. No lower critical threshold is ecologically relevant for this naturally mineralized biome. No upper detrimental threshold — higher values are harmful beyond this range.

Related Benchmarks

Other benchmarks in the AUS-AKW-CON-WEC family.