During the chlorination of drinking water, chlorine reacts with natural organic material to produce disinfection by-products, such as trihalomethanes and haloacetic acids, which are believed to be harmful to human health. The formation of these by-products is related to the aromatic carbon content of the water, for which specific ultraviolet absorbance serves as a useful surrogate. Because humic substances in water tend to have a higher aromatic carbon content and a higher specific ultraviolet absorbance than non-humic substances, they produce greater levels of disinfection by-products.
P.C. Singer; Humic Substances as Precursors for Potentially Harmful Disinfection By-Products. Water Sci Technol 1 November 1999; 40 (9): 25–30. doi: https://doi.org/10.2166/wst.1999.0434
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