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Tap and shower water at two locations in the Netherlands was examined for the presence of rapidly growing nontuberculous mycobacteria. Cultures yielded Mycobacterium peregrinum, M. salmoniphilum, M. llatzerense, M. septicum, and three potentially novel species, a distribution different from that in clinical samples. Nontuberculous mycobacteria (NTM) are omnipresent in our environment and cause opportunistic infections in humans after environmental exposure (4). Showers have recently been suggested as a source of NTM infection, because of their bio-films and aerosol formation (5). As in most environmental studies on NTM, the focus of the latter study was on the most common causative agents of human NTM disease, the Myco-bacterium avium complex (MAC) bacteria. MAC bacteria hav