Water Electrical Conductivity (EC)

AUS-TMI-IND-WEC General Moderate confidence

Benchmark Value

480 µS/cm

Direction: Higher is desirable ↑

Form: Point

Scoring Curve

Scoring curve unavailable

The scoring engine could not generate a curve for this benchmark context. The primary form is CompositeFramework, but the benchmark data may be missing required fields (e.g., optimal range bounds for an OptimalRange benchmark). This is typically a data quality issue in the benchmark pipeline.

Contributing Benchmarks

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

Evidence & Context

The proposed benchmark is the median surface water electrical conductivity observed across reference streams on Norfolk Island. Reference Value: 480 µS/cm 38

Metric Definition:

Surface water electrical conductivity (EC) measured as the ability of water to pass an electrical current, proportional to dissolved inorganic ions concentration.

Benchmark Definition:

Median surface water electrical conductivity representing a high level of ecological health in the Tropical and Subtropical Maritime Islands biome under Industrial and Infrastructure land use.

Justification:

Derived from a recent, scientifically rigorous, multi-year field study by CSIRO on Norfolk Island, a relevant subtropical maritime island proxy, aligned with national guidelines.

Sources (3)

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

Effects of increasing salinity on freshwater ecosystems in Australia - ResearchGate

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Norfolk Island Water Quality Assessment - Squarespace, accessed August 4, 2025, Journal

Norfolk Island Water Quality Assessment - Squarespace

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Preview of Water quality indicator: Electrical conductivity - Queen Mary University of London, accessed August 11, 2025,

Water quality indicator: Electrical conductivity - Queen Mary University of London, accessed August 11, 2025, Journal

(PDF) Effects of increasing salinity on freshwater ecosystems in ...

View Source

Supporting Sources (1)

Additional references from the underlying research that informed this benchmark.

Salinity - Murray�darling Basin Authority

Contextual Support GreyLiterature

Why test for electrical conductivity, acidity and alkalinity? - The Australian Museum, accessed July 13, 2025

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Context

Region Australia
Biome Tropical & Subtropical Maritime Islands
Land Use Industrial & Infrastructure Use
Assessment Pristine Reference
Evidence Type ReferenceCondition

Lifecycle

Status Active
Version 1
Effective From 19 Mar 2026

Notes

The benchmark is validated by national guidelines and represents a real-world developed island ecosystem. Functional range analysis includes no lower critical threshold, an optimal range of 150 – 800 µS/cm, and an upper detrimental threshold of 1500 µS/cm.

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