HEC-RAS is a software developed by the U.S. Army Corps of Engineers for modeling water flow in rivers and streams.
Best EPA SWMM Alternatives ranked by AI · updated Aug 2026
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EPA SWMM is a free, open-source model for urban stormwater, sanitary sewer, and combined sewer systems. It is used by utilities, researchers, and engineers to evaluate rainfall-runoff, surcharge, storage, treatment, and drainage scenarios.
Developer: U.S. Environmental Protection Agency
Price: Free
🎯 epa.gov/water-research/storm-water-management-model-swmm
Top 6 EPA SWMM alternatives
Bentley Water and Wastewater Utilities is a collection of engineering and infrastructure software for planning, designing, analyzing, and operating water distribution and...
Pros
- Covers both water and wastewater infrastructure workflows
- Integrates hydraulic analysis with GIS, CAD, and infrastructure data
- Supports large utility networks and digital-twin initiatives
Cons
- More complex to deploy and manage than standalone modeling tools
- Pricing and product scope are difficult to compare without a Bentley sales process
- Individual capabilities may require multiple Bentley applications
SierraSoft Hydro is civil-engineering software for hydrologic and hydraulic analysis of drainage and water-management projects. It supports design workflows for engineers working...
Pros
- Combines hydrologic and hydraulic workflows within SierraSoft's civil-engineering environment
- More focused on practical infrastructure design than general-purpose numerical modeling tools
- Can fit organizations already using other SierraSoft applications
Cons
- Less widely adopted and documented than HEC-RAS or EPA SWMM
- Smaller user and training ecosystem than major international competitors
- Pricing and technical capabilities are less transparently published
4
TUFLOW is a leading 2D and 3D flood modeling software that is known for its speed and accuracy. It offers a range...
Pros
- Speed and accuracy
- Advanced features for modeling and forecasting
Cons
- Pricing information not readily available
- May require additional training for beginners
Contact vendor for pricing
5
EPANET is a free software package for modeling water distribution systems.
Pros
- Open-source and free to use
- Widely used in the industry
Cons
- Limited support options
- Less advanced features compared to commercial software
6
InfoWater Pro
Autodesk
InfoWater Pro is a GIS-based water distribution modeling application for utilities and engineering consultants. It provides hydraulic simulation, scenario management, calibration, fire-flow...
Pros
- Strong ArcGIS integration for GIS-centric water utilities
- Detailed water distribution modeling and scenario analysis
- Well suited to utility planning and regulatory studies
Cons
- Requires ArcGIS, increasing licensing and administration costs
- Does not provide the same breadth of wastewater capabilities as Bentley's utility portfolio
- Steeper setup and specialist-training requirements than EPANET
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