The internal corrosion of water distribution systems is the main cause for the problem
of the public health threat as well as water leakage in the damaged pipeline, red
water, and odor and taste of the tap water. This study was examined the effect of
chemicals used for pH and alkalinity control and corrosion inhibitors for producing the
optimal corrosion control method. Corrosion study at different pH and alkalinity
indicated that these control using alkaline chemicals was effective in corrosion rate,
Fe release reduction, but examined to be increased in turbidity and corrosion-by-
products((TTHMs)problems. The turbidity was slightly increased, requiring caution in
controlling corrosion with Ca(OH)₂. At pH 9.0, TTHMs concentration is increased two
times compared with non-control of pH. Using the pipe which had experienced 28 years of
exposure, iron release was decreased with the corrosion inhibitor. Consequently, pH,
Alkalinity control method using alkaline chemicals must be complemented by corrosion
inhibitor application for efficient corrosion control.