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PySWMM

Free#37 of 89 in Physics Simulation Software

PySWMM: A focused Python package for controlling SWMM5 models and working with simulation data. Ranked #37 of 89 in Physics Simulation Software by our editors (5.3/10); pricing: Free plan; best for python users automating EPA SWMM stormwater models.

5.3/10Editor score
Visit PySWMM
PySWMM5.3 Visit PySWMM

At a glance

  • Editor score
    5.3 / 10
  • Pricing
    Free plan
  • Best for
    Python users automating EPA SWMM stormwater models
  • Free plan
    Yes
  • Paid from
    Free
  • Delivery mode
    Desktop
  • Facts checked
    23 Sep 2026
PySWMM screenshot

  • Where it wins

    • Control running SWMM simulations with Python logic
    • Access model networks, hydrologic parameters, and custom node inflows
    • Read metadata and time-series data from SWMM binary outputs

  • Where it doesn't

    • Focused on EPA SWMM5 rather than broader physics simulation
    • Requires Python and a programming-oriented workflow
    • Community support may not suit teams needing dedicated vendor support

Our verdict on PySWMM

PySWMM is an open-source Python package for engineers, modelers, and researchers working with EPA SWMM5 stormwater models. It is designed for programming workflows rather than learner-facing physics lessons or a visual simulation environment. Users can load and manipulate models, interact with a running simulation, and write Python control logic. Its desktop availability across Windows, macOS, and Linux gives Python users a way to work with SWMM models across those operating systems.

The package’s strongest fit is its connection to SWMM simulation behavior and data. It provides access to the model network and hydrologic parameters, supports custom node inflows, and can read metadata and time-series data from SWMM binary output files. Those capabilities make it relevant when a workflow needs programmatic control or extraction of model results, rather than only opening a model for manual review. EPA SWMM5 is its stated integration, so teams whose work centers on that model have a clearer fit than those seeking a general-purpose physics simulation toolkit.

PySWMM is installed as a Python package with pip and is community-owned and open source. There is no commercial plan structure described; its free, open-source packaging may suit individual practitioners as well as larger organizations with Python expertise. The tradeoff is its narrow scope: it is specifically an interface for SWMM stormwater modeling, not a broader simulation platform, and its listed support channel is community. Choose it if you need Python-driven SWMM workflows and can work within that scope; consider another product if you need a wider physics simulation environment, learner-focused tools, or dedicated vendor support.

Your product? Our editors can test PySWMM in depth and publish a review, labelled as paid · from $149/mo →

PySWMM pricing

Plans Free planFree Free to use — no paid tier required for the core job.
See plans on pyswmm.org

PySWMM fact sheet

Free planYes
Paid fromFree
Delivery modeDesktop
Lesson libraryNot verified
Authoring toolsNot verified
Assessment toolsNot verified
3D visualsNot verified
Offline accessNot verified
Data exportNot verified
DeploymentDesktop
PlatformsWindows, macOS, Linux
SupportCommunity
Built forSolo, Small business, Mid-market, Enterprise (editorial estimate)
Integrations1 integrations: EPA SWMM5
PricingFree plan
Websitepyswmm.org
Facts checked23 Sep 2026

PySWMM integrations

PySWMM lists 1 integrations on its own site.

  • EPA SWMM5

Alternatives to PySWMM

See all PySWMM alternatives →

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Featured on iTechGuides

Featured on iTechGuides — PySWMM 5.3/10

PySWMM is listed in our Physics Simulation Software directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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