About 2 to 3% of the nation’s energy is used to pump and treat water. Reusing treated waste­water for irri­ga­tion, replen­ish­ing water sources and even as a direct source for drink­ing water is one of the most cost-effective meth­ods to help save energy for a com­mu­nity. This is also an effi­cient way to extend the capac­ity of valu­able water resources. This arti­cle describes one inter­est­ing exam­ple of water reuse in San Anto­nio, Texas