Why is it necessary to use lead-free solder when installing copper drinking water pipes?

A- The Water Supply (Water Fittings) Regulations prohibit the use of lead solder as it may cause lead levels to exceed the drinking water standard for lead. This could be harmful to health, particularly to babies and children. Only lead-free solder should be used. It is essential that minimum quantities of flux and solder are used and, after soldering, that all traces of flux are flushed away in order to prevent corrosion, which could contaminate the water. DWI has a leaflet available free of charge called Using Lead-free Solder for Water Supply Fittings that gives more advice. ... more