Water Quality Awareness 101 9 | P a g e Working in a dirty environment – highlights the importance of cleaning clothes and footwear Reuse of fittings and piping that have previously been used in other applications (e.g. sewage systems) Contamination of tools, equipment and spare parts that may have occurred off site or in transit to the repair job. Storage within a supplier’s premises cannot guarantee that the materials are currently fit for drinking water use Poor pipe management - note ingress of soil and foreign matter into open pipe ends