Water Nitrate
Benchmark Value
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 8 benchmarks together — the OptimalRange form drives the primary score, while 7 guard(s) constrain the result.
Evidence & Context
The modern, science-based regulatory ceiling for preventing direct toxic effects in a sensitive, soft-water ecosystem is approximately 2.84 mg/L as Nitrate (NO3 ).
Nitrate concentration in water (NO3) representing the 99% species protection level for sensitive soft-water ecosystems.
Regulatory toxicological ceiling for nitrate concentration to protect 99% of species in soft water ecosystems in Temperate Grassy Woodlands & Plains under conservation land use.
This value represents the 99% species protection level for sensitive soft-water ecosystems, based on the most current ANZEG framework.
Sources (1)
Toxicant default guideline values for aquatic ecosystem protection: Nitrate in freshwater - Water Quality Australia, accessed July 13, 2025,
View SourceSupporting Sources (24)
Additional references from the underlying research that informed this benchmark.
2022 Recommended Land Management for the Water Quality Protection Lands Austin, Texas - AustinTexas.gov
View Source
Soil moisture release curves—What they are. Why you need them. How to use them., accessed May 15, 2025,
View SourceANZECC & ARMCANZ (2000) guidelines - Water Quality Australia
View Source
Northern Territory Government (2020) Darwin Harbour Region Water Quality Objectives, Report Card Section 3.0.
View Source
Report Card 2022-23 - EPA Victoria
View SourceANZECC (2000) Australian and New Zealand Guidelines for Fresh and Marine Water Quality.
View SourceWater Quality Guidelines Home - Water Quality Australia
View SourceInfluence of Forest Harvest on Nitrate Concentration in Temperate Streams—A Meta-Analysis - FreiDok plus
View Source
Hickey, C. (2002). Nitrate guideline values in ANZECC 2000. Memorandum MFE02237 prepared for Ministry for the Environment (New Zealand). NIWA Client Report: HAM2002-126.
View SourceAustralian and New Zealand guidelines for fresh and marine water quality, accessed August 3, 2025
View Source
Australian and New Zealand Guidelines for Fresh and Marine Water ...
View SourcePublic nomination for Schedule 1 of the ESP Act, accessed May 19, 2025
View SourceWater quality guidelines - Queensland Environment Department, accessed July 31, 2025,
View SourceNitrate guidelines values in ANZECC 2000 - Ministry for the Environment, accessed August 1, 2025
View SourceNitrate toxicity guidelines for the National Objectives Framework ..., accessed August 3, 2025,
View SourceReal-time water quality monitoring | Estuaries - Environment and Heritage
View Source
Toxicant default guideline values for aquatic ecosystem protection ...
View SourceThe impact of nitrate pollution in waterways on freshwater species, accessed July 31, 2025,
View Source
Toxicant default guideline values for aquatic ecosystem protection ...
View Source
What's wrong with the Australian River Assessment System (AUSRIVAS)?, accessed August 3, 2025
View SourceDrivers of water quality in Afromontane-savanna rivers - Frontiers
View SourceAustralian and New Zealand Guidelines for Fresh and Marine Water Quality (2000)
View SourceWater quality in the Murray–Darling Basin: The potential impacts of climate change
View Source(PDF) Impact of mitigated forestry activities on turbidity: assessing ..., accessed August 10, 2025
View Source