AQUATOX
Gov-Public
EPA's aquatic ecosystem model — fate and ecological effects of nutrients, toxics and stressors together.
8 tools · Category
Water Quality & Environmental
Water-quality modelling spans everything from a simple dissolved-oxygen sag curve to full ecosystem response models. This category indexes surface-water quality simulators, sediment and nutrient tools, ecological assessment utilities and the compliance-oriented calculators regulators reference. Many of the strongest tools here come from public agencies — EPA, USGS, Deltares — and are free to use in commercial work.
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AquaChem
Commercial
Water quality data management, geochemical plotting, and statistical analysis software for hydrogeologists.
BASINS
Gov-Public
EPA's watershed assessment suite — HSPF continuous watershed-quality modelling with GIS and data access built in.
CE-QUAL-W2
Free
The standard 2D reservoir and stratified-river water-quality model — temperature, DO and eutrophication.
EFDC+
Freemium
Open-source 3D hydrodynamics and water quality — the EFDC lineage modernised, with a commercial GUI option.
EGRET
Open Source
USGS R package for long-term water-quality and streamflow trends — home of the WRTDS method.
QUAL2K
Free
The classic river water-quality model — DO, nutrients and algae along a 1D stream network.
WASP
Gov-Public
EPA's Water Quality Analysis Simulation Program — eutrophication, toxics and sediment in rivers and estuaries.