Coliform refers to a specific group of bacteria characterized as rod-shaped, Gram-negative, and non-spore-forming. One well-known member of this group is Escherichia coli (E. coli). Coliform bacteria are commonly found in water, soil, and on plants, as well as in the feces of all warm-blooded animals. Water testing often includes checks for coliform bacteria to assess water quality. While these bacteria typically do not cause illness themselves, their presence suggests potential contamination by other harmful bacteria or pathogens in the water supply. However, it is important to note that certain rare strains of E. coli, such as 0157:H7, can lead to serious illness. Recent outbreaks linked to E. coli 0157:H7 have mostly been associated with consuming undercooked hamburger, though instances involving contaminated water are uncommon.