A common surprise for many clients is that even a mains water supply contains bacteria. Many people assume that, because water is safe to drink, it is sterile – but this is not the case. Water companies have a duty to ensure that the water they provide is fit to consume by removing all harmful bacteria - but non-harmful bacteria will remain. With non-harmful bacteria in our domestic systems, water quality can become an issue if it can breed. To confirm the health of your water system, one method includes the microbiological testing of your water systems.