What is the purpose of the Interim Enhanced Surface Water Treatment Rule (IESWTR)?

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The purpose of the Interim Enhanced Surface Water Treatment Rule (IESWTR) is specifically designed to improve the treatment of surface water and to enhance the removal or inactivation of microbial contaminants. This rule was implemented in response to concerns about the presence of pathogens in drinking water sourced from surface water, which pose significant health risks.

By establishing specific treatment requirements for water systems that use surface water or ground water under the influence of surface water, the IESWTR aims to ensure that these systems effectively manage microbial contaminants. This is particularly critical as microbial pathogens such as Giardia and viruses can lead to serious health issues, underscoring the rule’s emphasis on public health protection through improved water treatment practices.

This focus on microbial contaminants distinguishes the IESWTR, as it does not primarily address the regulation of disinfection by-products, surface water flow, or lead and copper levels, making it a targeted approach to enhancing the safety of drinking water supplies that use surface water sources.

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