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Environmental Simulations, Inc. (ESI) is a Pennsylvania-based provider of software, consulting, and training for groundwater modeling. Their software portfolio includes Groundwater Vistas (GV9) and AquiferWin32 (v6), with GV9 released in 2024, and they also publish a free groundwater textbook, Hydrogeology 101. ESI offers webinars and training courses on groundwater flow and transport modeling, model calibration with PEST, MODFLOW variants, MT3DMS/SEAWAT, and Python programming for modelers.
AI named Groundwater Models from December 2025 to February 2026.