The primary source for the stable, 32-bit version (EPANET 2.2) is the US EPA Water Research website. It is typically bundled as a self-extracting archive or a .zip file containing epanet2.dll , epanet2.lib , and relevant C/C++ header files.
Accessing the Toolkit depends on whether you need the official US EPA release or the community-driven Open Water Analytics (OWA) version. epanet toolkit download
Developers specifically seeking 64-bit DLLs for modern Windows applications can find pre-built resources on specialized developer pages like epanet.de . Language-Specific Wrappers & Toolkits The primary source for the stable, 32-bit version (EPANET 2