After more than 2.5 years of intense work in working group no. 12 of UNE-AENOR’s CTN 100, on April 13, the UNE 1000030: 2017 Standard “Prevention and control of the proliferation and dissemination of Legionella in facilities” was published, replacing and canceling the UNE 10000: 30: 2005 IN Standard. We attach Technical article making a practical and outstanding summary of the main novelties and conclusions about the new Standard.