USGS: Science for a changing world

PHAST--A Computer Program for Simulating Groundwater Flow, Solute Transport, and Multicomponent Geochemical Reactions



Bullet Release notes
Bullet Abstract
Bullet Discussion forum: Search for answers, ask a question
Bullet Mail archive--Questions and answers about PHREEQC, PHAST, and Netpath
Bullet P4W example, including PowerPoint guides, geographic data, and completed p4w files.
Bullet PHREEQC welcome page
Bullet User Rights Notice

Batch Version Download:

new bullet PHAST Version 3 is released. It uses PhreeqcRM (Parkhurst and Wissmeier, 2015) for the reaction engine.

The Free Software Foundation's gunzip may be necessary to uncompress the UNIX tar files for Sun. However, some World Wide Web browsers automatically uncompress retrieved files.

Graphical User Interfaces
Platform Processor File names Size Notes
Windows 64-bit phast4windows-3.4.0-12927-x64.exe 85M P4W, Model Viewer, database files, documentation, examples
Any ModelMuse Model Muse (PHAST Version 1 capabilities only)
Batch Versions of PHAST
Any Any phast-3.4.0-12927.tar.gz 38M Source, configure, CMake, database files, documentation, examples
Windows 64-bit phast-3.4.0-12927-x64.exe 48M Executables, configure, Model Viewer, PhastHDF, database files, documentation, examples


Bullet Documentation for PHAST Version 2 (and 3) (PDF)
Bullet PHREEQC version 3 Documentation (PDF, 4.2M)
Bullet PHREEQC version 2 Documentation (PDF, 2.3M)
Bullet Ground Water Note for Phast4Windows (PDF)


Bullet Status of PHREEQC Programs
Bullet Your Comments/Bug Reports

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