PFLOTRAN vs MODFLOW-USG

PFLOTRAN8.0Visit MODFLOW-USG7.8Visit

Higher score PFLOTRAN #5 in Groundwater Modeling Software 8.0/10 Open source ✓ 1 of 3 features Visit PFLOTRAN

vs

MODFLOW-USG #6 in Groundwater Modeling Software 7.8/10 Free plan Free plan✓ 0 of 3 features Visit USGS

• PFLOTRAN fits best

  Large-scale reactive transport and fractured media

• MODFLOW-USG fits best

  Unstructured grids and complex well or conduit systems

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Side by side

Feature	PFLOTRAN 8.0/10 Visit ↗	MODFLOW-USG 7.8/10 Visit ↗
At a glance
Editor score	8.0	7.8
Ranking	#5 in Groundwater Modeling Software	#6 in Groundwater Modeling Software
Best for	Large-scale reactive transport and fractured media	Unstructured grids and complex well or conduit systems
Pricing model	Free	Free
Starting price	Open source	Free plan
Free plan	Not checked yet	✓ (best)
Free trial	—	—
Deployment	Self-hosted	Self-hosted
Support	Docs	Email
Built for	Small business, Mid-market, Enterprise	Mid-market, Enterprise
Features PFLOTRAN 1/3 · MODFLOW-USG 0/3
Transport modeling	✓ (best)	Not checked yet
Surface-water coupling	Not checked yet	Not checked yet
GIS data exchange	Not checked yet	Not checked yet
Specs
Flow modeling method	Other	Finite-difference
Model dimensions	3d	Not checked yet
Supported platforms	Linux	Not checked yet
Our review
Pros	Combines groundwater flow with reactive transport and geochemical reactions Parallel execution supports large-scale scientific simulations Models both porous and fractured subsurface media	Handles structured, unstructured, nested, and multi-shape grids Models arbitrary cell connectivity with Ghost Node Correction Represents multi-node wells, karst conduits, tile drains, and networks
Cons	Linux is the only listed platform Self-hosted deployment requires managing the computing environment Documentation is the listed support channel	Self-hosted deployment requires local installation and management Support is provided through email rather than broader channels Flow-focused scope suits fewer transport and surface-water workflows
Our verdict	PFLOTRAN is an open-source simulation code for subsurface groundwater flow and reactive transport. It is aimed at researchers and technical teams constructing numerical models of groundwater movement, dissolved chemical species, and… Read the review →	MODFLOW-USG is a USGS groundwater-flow model for teams working with structured or unstructured grids, nested layouts, multiple cell shapes, and complex subsurface connections. Its control-volume finite-difference formulation allows each… Read the review →

Strengths and trade-offs

• PFLOTRAN — where it wins

  • Combines groundwater flow with reactive transport and geochemical reactions
  • Parallel execution supports large-scale scientific simulations
  • Models both porous and fractured subsurface media

  Where it doesn't

  • Linux is the only listed platform
  • Self-hosted deployment requires managing the computing environment
  • Documentation is the listed support channel

• MODFLOW-USG — where it wins

  • Handles structured, unstructured, nested, and multi-shape grids
  • Models arbitrary cell connectivity with Ghost Node Correction
  • Represents multi-node wells, karst conduits, tile drains, and networks

  Where it doesn't

  • Self-hosted deployment requires local installation and management
  • Support is provided through email rather than broader channels
  • Flow-focused scope suits fewer transport and surface-water workflows

• PFLOTRAN8.0/10 · Open source

  A parallel, open-source engine for large 3D groundwater and geochemical simulations.

  Visit PFLOTRANFull verdict →
• MODFLOW-USG7.8/10 · Free plan

  A free, self-hosted MODFLOW variant for irregular grids and specialized groundwater systems.

  Visit USGSFull verdict →