ORD Water Distribution Network Model
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ORD Water Distribution Network Model (AKA "EPANET")


EPANET is used to perform extended-period simulation of the hydraulic and water quality behavior within drinking water distribution systems (e.g., pressurized pipe networks), which consist of pipes, nodes (junctions), pumps, valves, storage tanks, and reservoirs. It can be used to track the flow of water in each pipe, the pressure at each node, the height of the water in each tank, a chemical concentration, the age of the water, and source tracing throughout the network during a simulation period.

EPANET was developed as a tool for understanding the movement and fate of drinking water constituents within distribution systems, and can be used for many different kinds of applications in distribution systems analysis. Today, engineers and consultants use EPANET to design and size new water infrastructure, retrofit existing aging infrastructure, optimize operations of tanks and pumps, reduce energy usage, investigate water quality problems, and prepare for emergencies. EPANET can also be used to model contamination threats and evaluate resilience to security threats or natural disasters.

This is the official EPANET source code repository maintained by the United States Environmental Protection Agency (EPA). EPANET source code is written in the C Programming Language and released in the Public Domain.

Intended Audience

The intended audience for this repository can be divided roughly into two groups:

  • Programmers interested in water distribution system modeling
  • Engineers working on water distribution system modeling interested in programming

EPANET has an active open source software community including consulting engineers, students, researchers, software companies, professional organizations, other interested members of the public, and EPA partners. An Open Source EPANET Initiative at http://community.wateranalytics.org has released source code for an EPANET engine version 2.1 that included community sourced bug fixes and they are working on additional releases with new feature requests. Others are encouraged to fork EPANET and develop a great new feature to share with the community.


EPANET is released under the Creative Commons CC0 public domain license. See the LICENSE.txt file.

Contributing to EPANET

Information on how to contribute to the development of EPANET can be found in the CONTRIBUTING.md file.

Find Out More

More information on the purpose, capabilities, and applications of EPANET can be found at the official EPANET Website. In addition, the source code distributed here and a user interface as well as extensions to EPANET are available for download.


EPANET's user manual is available for download from the official EPANET Website.



EPA Disclaimer

The United States Environmental Protection Agency (EPA) GitHub project code is provided on an "as is" basis and the user assumes responsibility for its use. EPA has relinquished control of the information and no longer has responsibility to protect the integrity, confidentiality, or availability of the information. Any reference to specific commercial products, processes, or services by service mark, trademark, manufacturer, or otherwise, does not constitute or imply their endorsement, recommendation or favoring by EPA. The EPA seal and logo shall not be used in any manner to imply endorsement of any commercial product or activity by EPA or the United States Government.