Using tap water to rinse suction tubing can cause transmission of

Pseudomonas spp., particularly Pseudomonas aeruginosa, is a common waterborne pathogen. Using tap water to rinse suction tubing has been associated with outbreaks of Pseudomonas infections.

From the APIC Text:

“Water bottles improperly filled with tap water and used for rinsing tracheal suction tubing resulted in an outbreak of P. cepacia... Tubing permanently attached to showers... implicated in a serious outbreak of P. aeruginosa bloodstream infection.”