Download SWMM

Currently there are 11 versions of SWMM that you can download from this page. To download your selection, please click on the appropriate link. For specific information on updates included in the latest version of SWMM5, see the update list.

SWMM5.0.013 [2008.03]

The latest official version of the US EPA SWMM5 program. It is fully compatible with the PCSWMM.NET spatial decision support system. Additional information is available on the US EPA SWMM5 website.

SWMM5.0.013 (2008.03) (2.7MB + 8.7MB ancillary files)

SWMM 4.4h [2005.10] - Oregon State University BETA version

This is the last public version of the older SWMM4 available. Posted by Dr. Wayne Huber from Oregon State University, it contains a number of improvements and additional capability (including larger array sizes). Earlier releases of 4.4 are also provided.

SWMM4.4h (2005.10) (5.9MB)
SWMM4.4h (2005.07) (5.9MB)
SWMM4.4h (2004.07) (5.6MB)
SWMM4.4h (2003.07) (5.2MB)
SWMM4.4h (2002.05) (1.4MB)
SWMM4.4h (2001.05) (5.0MB)
SWMM4.4gu (1999.11) (5.2MB)
SWMM4.4 (1997.08) (5.2MB)

SWMM 4.31 [1997.01] - Oregon State University BETA version

Posted by Dr. Wayne Huber from Oregon State University, it contains updates and bug-fixes not included in the official release below.

SWMM4.31 (1997.01) (2.4MB)

SWMM 4.3 [1994.05] - Official US EPA version

This version is the official release of SWMM, but it's somewhat out of date. The zipped file contains the self-installing program, support files, example files, and release notes.

SWMM4.3 (1994.05)  (2.5MB)