AWWA Seeks Utilities for Disinfectant Residuals Study

The American Water Works Association and Environmental Engineering & Technology are looking for water systems to participate in an important study on disinfectant residuals in August and September.Specifically, the study is seeking systems that use free chlorine either pre- or post-filter (not raw water) year-round for secondary disinfection in their distribution systems and have levels of DBPs near the 64/48 TTHM/HAA5 (80 percent of the Maximum Contaminant Levels).Participation in this study would involve discussions with EE&T staff to better understand each system and chlorination feed points. It would also require collecting and returning — via prepaid shipping — five, 1-liter samples of