In the present study, water pipe corrosion was examined according to the pipe type and under various water quality conditions, including changes of pH and alkalinity, and high concentration of iron(Fe) and manganese(Mn). Specimens of three different representative water pipe types, steel pipes, galvanized steel pipes, and stainless steel pipes, were used to investigate the corrosion characteristics, while the water quality was varied from strongly acidic (pH 1) to strongly alkaline (pH 12). Samples were collected every day and their pH, Fe, and Mn concentration, hardness, and alkalinity were analyzed through a loop test. The corrosivity was estimated from the Langelier saturation index, which can be calculated by water quality analysis results. The corrosion rate was calculated through the weight loss of the sample. The corrosion index increased for the first three days regardless of the water quality, except for the pH 1.25 condition. The corrosion rate decreased significantly, because of the film either created by the reaction of the corrosion oxides or generated on the surface of the specimen. High concentration of Fe and Mn in the water led to actively occurring corrosion.