Water Electrical Conductivity (EC)

AUS-TGP-AQU-WEC General Moderate confidence

Benchmark Value

No specific value — see range

Range: 50 to 280 µS/cm

Optimal Range: 50 to 280

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 4 benchmarks together — the OptimalRange form drives the primary score, while 3 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary MaximumOnly Guard Point Guard OptimalRange Guard

Evidence & Context

No credible data supports the establishment of a specific lower critical threshold for EC in this context. The natural condition of the biome's healthiest streams provides a sufficient baseline of dissolved salts.

Metric Definition:

Electrical Conductivity (EC) in freshwater systems, representing dissolved salts concentration.

Benchmark Definition:

This benchmark represents the optimal range of water electrical conductivity in freshwater streams where the ecosystem exhibits high function, resilience, and biodiversity in Australia's Temperate Grassy Woodlands & Plains.

Justification:

Based on synthesis of observational data and biological response thresholds, no evidence found for a lower critical threshold.

Sources (1)

Murray-Darling Basin - Monthly Water Update - AWRA - Bureau of Meteorology Journal

Murray-Darling Basin - Monthly Water Update - AWRA - Bureau of Meteorology

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Supporting Sources (5)

Additional references from the underlying research that informed this benchmark.

(PDF) Effects of increasing salinity on freshwater ecosystems in Australia - ResearchGate, accessed August 11, 2025,

Contextual Support GreyLiterature

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

View Source

Preview of Diatom–water quality thresholds in South Australian streams indicate a need for more stringent water quality guidelines - CSIRO PUBLISHING | Marine and Freshwater Research, accessed May 15, 2025,

Diatom–water quality thresholds in South Australian streams indicate a need for more stringent water quality guidelines - CSIRO PUBLISHING | Marine and Freshwater Research, accessed May 15, 2025,

Direct Evidence Journal

Diatom–water quality thresholds in South Australian streams indicate a need for more stringent water quality guidelines - CSIRO PUBLISHING | Marine and Freshwater Research

View Source

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

Contextual Support Government

Salinity | Murray–Darling Basin Authority

View Source

Salinity - Murray�darling Basin Authority

Contextual Support Journal

Salinity - Murray–Darling Basin Authority

View Source

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

Regulatory Framework Government

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

View Source

Context

Region Australia
Biome Temperate Grassy Woodlands & Plains
Land Use Aquaculture
Assessment Conservation Target
Evidence Type ReferenceCondition

Lifecycle

Status Active
Version 1
Effective From 3 Jun 2026

Notes

Lower boundary (~50 µS/cm) represents typical lower end of EC values observed in healthy, minimally disturbed rivers. No evidence of detrimental effects from low EC in this biome.

Related Benchmarks

Other benchmarks in the AUS-TGP-AQU-WEC family.