In a story that came full circle, the community—a group of modern programmers and engineers—stepped in recently. They convinced the EPA to let them "open source" the code. They updated it to EPANET 2.2, fixing bugs that had existed for 20 years and adding new features.
EPANET permite a ingenieros y consultores realizar las siguientes tareas crÃticas: EPANET | US EPA
The "interesting" part is that there is no single corporate headquarters for "EPANET Spanish." It is a decentralized effort, maintained often by university professors and volunteers who keep the files hosted on academic servers and forums so that engineers in Bogotá, Madrid, or Mexico City can access it without a credit card.