As more and more utilities assess optimal coagulation it has become apparent that a significant impact can be made on the formation of disinfection byproducts. For some utilities "enhanced coagulation" through optimizing TOC removal could, on its own, become a viable strategy to comply with exising or future Safe Drinking Water Act Rules. This paper reviews data from 12 water plants in which optimal coagulation was assessed using ferric and alum coagulants with optional polymer addition. All of the plants were conventional coagulation filtration plants using free chlorine for both primary and residual disinfection. Includes 7 references, table, figures.