RESUMEN
<p><b>OBJECTIVE</b>To assess the health safety of copper, steel and plastic water pipes by field water quality investigations.</p><p><b>METHODS</b>Four consumers were randomly selected for each type of water pipes. Two consumers of every type of the water pipes had used the water pipes for more than 1 year and the other 2 consumers had used the water pipes for less than 3 months. The terminal volume of tap water in copper and steel water pipes should be not less than 0.1 liter, whereas that in plastic water pipes should be not less than 1 liter.</p><p><b>RESULTS</b>The mean values of the experimental results in the second field water quality investigation of the copper and steel water pipes met the Sanitary Standards for Drinking Water Quality. The items of water sample of the plastic water pipes met the requirements of the Sanitary Standards for Drinking Water Quality.</p><p><b>CONCLUSION</b>Copper, steel, and plastic pipes can be used as drinking water pipes.</p>