(HAA) – (CX3COOH, where X = Cl, Br, H in various combinations). A class of disinfection by-products formed primarily during the chlorination of water containing natural organic matter. When bromide (Br–) is present, a total of nine chlorine-, bromine-and-chlorine-, or bromine-substituted species may be formed. Trihalomethanes and haloacetic acids are the two most prevalent classes of by-products formed during chlorination and are subject to regulation under the Disinfectant/Disinfection by-products rule.

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