Biofilms can exist wherever surfaces come into contact with water.
Biofilms are a community of microorganisms that can attach and surround a solid surface. The secrection ofa "slime" making the Biofilm resistant to treatment with disinfection processes. If the Biofilm mass is not controlled eventually it may corrode pipes, clog water filters, impart a taste and odour and in the worst-case cause disease from opportunistic pathogens.
Many organisms can be part of the Biofilm such as Pseudomonads, Fungi, Yeasts, Algae and Protozoa. In fact, as the Biofilms grow they create their own environment, which can shed and migrate through the system like a living entity.
To find out more about biofilms and sample requirements review Biofilms Fact Sheet