Inspired By Excellence & Innovation

SSP&A develops and distributes software for groundwater modeling and related analyses. Many of these programs are provided free-of-charge, although a professional version of MT3D, referred to as MT3D99, is available. Select a software offering below to learn more.

Learn about the software SSP&A develops and distributes for groundwater modeling and related analysis – both in-house and collaborative development with the U.S. Geological Survey and other consultants.

Visit our Software Development page to learn more about our capabilities and experience.

Additional SSP&A Software Links

Access external websites with SSP&A software downloads, documentation, and examples at GitHub and SSP&A’s free software registration and download site:

Free Registration & Downloads

Version notes and downloads for mod-PATH3DU, OneD, and DECAY at https://software.sspa.com/

mod-PATH3DU, OneD, and DECAY

DDF on GitHub

Distributed Drawdown Function (DDF) – An Analytical Tool for Estimating Pumping-Induced Drawdown and Stream Depletion Nearby Complex Meandering Stream Networks

GitHub DDF Repository

makePST on GitHub

makePst – A Reproducible and Auditable Spreadsheet Workflow for PEST Model Calibration

GitHub makePst Repository

Environmental and Water Resource Solutions

S.S. Papadopulos & Associates is a multi-disciplinary consulting firm focused on delivering solutions for groundwater and hydrogeology, environmental engineering, contaminant studies, remediation, geochemistry, and surface-water hydrology.