Given the temperature of the lines around 20⁰C (68F) and structure of water lines, dental lines and related equipment are a prime habitat for bacteria and some pathogens. There is liability for passing on infections to patients, and service personnel. The dental practice is responsible to ensure that the water used in dental procedures, at a minimum, meets drinking water standards: no E.Coli and less than 500 CFU/ml total bacteria and fungi. Maintaining compliance in regards to dental waterline infection control is an on-going risk management issue.
Importantly, pre-emptive screening will allow them to avoid shutdown costs, which could be orders of magnitude higher. One day of shutdown can cost $5K+ USD per day in revenues for a small dental office in the US.