Water Nitrate

AUS-ASC-LVG-WNI General Moderate confidence

Benchmark Value

0.1 mg/L

Thresholds: Lower: 0.015, Upper: —

Direction: Lower is desirable ↓

Form: MinimumOnly

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 10 benchmarks together — the OptimalRange form drives the primary score, while 9 guard(s) constrain the result.

Contributing Benchmarks

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

Evidence & Context

Persistent exceedance of 0.015 mg/L NOx-N indicates a departure from the best available condition and an increase in ecological risk. Concentrations exceeding 0.1 mg/L N would more clearly signal notable anthropogenic impact.

Metric Definition:

Water nitrate concentration as NOx-N indicating the upper detrimental threshold for ecological health in alpine/subalpine grazing systems.

Benchmark Definition:

This benchmark represents the lower threshold of water nitrate concentration above which ecological risk and anthropogenic impact increase in alpine and subalpine grazing systems.

Justification:

Based on ANZECC (2000) guidelines and observed impacts in alpine ecosystems, concentrations above 0.1 mg/L N indicate notable anthropogenic influence and ecological risk.

Sources (1)

Preview of Australian and New Zealand Guidelines for Fresh and Marine Water Quality (2000), accessed May 11, 2025,

Australian and New Zealand Guidelines for Fresh and Marine Water Quality (2000), accessed May 11, 2025, Journal

Northern Territory Government (2020) Darwin Harbour Region Water Quality Objectives, Report Card Section 3.0.

View Source

Context

Region Australia
Biome Alpine and Subalpine Complex
Land Use Livestock Grazing & Pasture
Assessment Pristine Reference
Evidence Type DegradationThreshold

Lifecycle

Status Active
Version 1
Effective From 16 Mar 2026

Notes

This threshold is distinct from human or livestock toxicity levels and is specific to ecological health in alpine/subalpine grazing systems. ConsistencyResolver applied 2026-03-23 00:19 UTC: LowerThreshold 0.1 → 0.015 (check: MinAboveMax, rationale: Swapping values to correct form misclassification; the MinimumOnly threshold should be 0.015 mg/L as the lower degradation floor, consistent with Notes indicating values persistently above 0.015 indicate increasing ecological risk.)

Related Benchmarks

Other benchmarks in the AUS-ASC-LVG-WNI family.