FREEWAT review
A free, GIS-centered modeling environment spanning groundwater simulation, analysis and planning.
Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026
FREEWAT is a free, open-source modeling environment delivered as a plugin for the QGIS desktop GIS. It is intended for engineering and geoenvironmental companies, water and river-basin authorities, environmental agencies, universities, and research institutions. The software brings groundwater and surface-water simulation, transport, data analysis, time-series work, calibration, and water-management planning into a GIS-centered workflow. Its combination of modeling and planning tools suits teams that need to connect spatial data with water-resource questions, rather than a narrow flow-modeling tool alone.
The modeling stack covers MODFLOW-family groundwater flow, saturated and unsaturated solute transport, and density-dependent flow with SEAWAT. FREEWAT also supports surface-water and groundwater interactions, including lake interactions. For analysis, akvaGIS handles hydrogeological and hydrochemical data, while the OAT module supports time-series analysis. UCODE provides model calibration, sensitivity analysis, and parameter estimation. This breadth is a clear fit for projects that need several connected modeling and analysis capabilities in one environment; it may be more than necessary for users seeking only a focused analysis task.
FREEWAT has no license cost and is described as open source. Its integrations include QGIS, SpatiaLite, MODFLOW, MT3DMS, MT3D-USGS, SEAWAT, UCODE_2014, and FloPy. The current plugin is installable on Windows and Linux; macOS use requires a Windows or Linux virtual machine. Deployment is desktop-based, with community and documentation support channels. Choose FREEWAT if a QGIS-centered workflow and broad water-management modeling are priorities. It is a less direct fit for teams that need native macOS installation or prefer a non-desktop modeling environment.
Questions about FREEWAT
What does FREEWAT run on? Windows and Linux. It runs as a desktop app.
What does FREEWAT integrate with? 8 integrations, including QGIS, SpatiaLite, MODFLOW, MT3DMS and MT3D-USGS.
Who is FREEWAT built for? Small businesses, mid-market companies and enterprises (our editorial estimate).
FREEWAT pros and cons
- Where it wins
- Combines MODFLOW-family flow modeling with solute and density-dependent transport.
- Connects groundwater and surface-water interaction modeling with QGIS.
- Includes calibration, sensitivity analysis and water-management planning tools.
- Where it doesn't
- The current plugin is installable on Windows and Linux only.
- Its workflow is delivered through the QGIS desktop GIS plugin.
- Support channels are community and documentation.
FREEWAT fact sheet, pricing and score →
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