This powerpoint presentation begins by listing the major benefits of chloramines, and the drawbacks/unintended consequences of chloramines. It defines nitrification as the microbiological oxidation of ammonia to nitrite and ultimately to nitrate. A table of Nitrite Monitoring and Trigger Guidance for Distribution Systems is provided. A Southwest Case Study is presented, with topics consisting of: red water complaints; treatment train; source water and finished water quality; and, first phase study design. Case study conclusions were that: severe nitrification and corrosion in distribution system were leading to a marked drop in disinfectant residuals, an increase in HPC levels, a reduction in pH on order of 1 unit (less buffering capacity due to low alkalinity), and an increase in iron release/turbidities; nitrification occurring in areas of system not experiencing iron corrosion (and upstream of areas where iron corrosion taking place; interrelationships between nitrification, red water, and microbial activity in system complex; and, embarking on major study to better understand.