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Small Systems to Tackle Disinfection By‐products

This article describes disinfection by‐products (DBPs) and the history behind their regulation and research. The kind and amount of DBPs that form depend on several factors, which are discussed here. The first DBPs regulated were total trihalomethanes (TTHMs) in 1979. These regulations, however, only applied to large community water systems (those serving 10,000 or more people) that add a disinfectant (oxidant) to the water in any part of the treatment process. The reasons that small systems were originally exempted from the rule are discussed along with the future of small systems and DBP regulation.