EPANET

EPANET is software that models water distribution piping systems. EPANET is public domain software that may be freely copied and distributed. It is a Windows 95/98/NT/XP/7/8 program. EPANET performs extended period simulation of the water movement and quality behavior within pressurized pipe networks.

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LinkedIn

LinkedIn has a group dedicated to EPANET.

Wikipedia

Wikipedia has a pretty good page that gives some background info and resources

Google Groups

Google Groups has a pretty active forum.

AWWA

Although not EPANET specific, the AWWA publishes a great book (M32) on modeling drinking water system

Santiago Arnalich

Santiago Arnalich has a nice little book that has some good info on using EPANET.  His focus is on using the software in developing areas.

EPACAD

EPACAD is a utility for turning an AutoCAD file into an EPANET file.  You will still have to edit the file in EPANET to add pipe and junction properties as well as any other necessary network features.

gHydraulics

gHydraulics is a plugin to QGIS and helps you create an EPANET file from GIS files.  You may still have to edit features in EPANET before you will get a working model.

water-simulation.com

water-simulation.com is a good website for EPANET news and other links.