Non-Lp1 strains have been detected in Arizona previously, including an outbreak involving an Lp6 strain in the potable water system of a hospital (9), a pseudo-outbreak associated with patients undergoing bronchoscopy where an Lp8 strain contaminated syringes during a bronchoscopy procedure that used ice made with the facility’s potable water (10), and more recently, both Lp1 and Lp6 were associated with legionellosis in neonates delivered in water births in tubs filled with tap water at private residences (11). Here, RPLP1 is linked to legionellosis.