Instances of accelerated corrosion of galvanized pipe conveying water through specialist systems have been reported in the literature. The nature and speed at which corrosion has occurred suggests that microbially influenced corrosion (MIC) may be one of the causes. Bacteria were isolated from a previously failed pipe and assessed for their influence on corrosion by incubating pure culture biofilms on galvanized steel coupons over a 5 week time course. Isolates were identified by 16S rRNA gene sequencing analysis. A total of 11 isolates including Afipia sp. and Pseudomonas sp. were found to increase the corrosion of galvanized steel compared with sterile control coupons throughout at least 2 of the 5 weeks of incubation (P < 0.05). At week 5 the total loss of zinc from all coupons with each of the 16 isolates attached was higher than the control (P < 0.05). The isolated bacteria in the current study comprise a unique group that have not previously been associated with metal corrosion of any kind. The current study highlights the possible importance of microbes in the corrosion of galvanized pipe systems and suggests that management strategies that control microbial growth may help in preventing such failures from occurring in the future.