Which regulation requires surface water systems to maintain specified C x T values?

The Surface Water Treatment Rule (SWTR) is the regulation that mandates surface water systems to maintain specified values of C x T, where C represents the concentration of the disinfectant, and T signifies the contact time with the water being treated. The purpose of this regulation is to ensure effective disinfection of surface water sources, thereby reducing the risk of waterborne pathogens and ensuring that the drinking water is safe for public consumption.

This regulation outlines minimum standards for the treatment of surface water and sets forth specific criteria that must be met to ensure that the water is properly disinfected and safe for distribution. By establishing required C x T values, the SWTR ensures that utilities apply sufficient disinfection practices based on the characteristics of their water supply, including factors such as the type and quantity of contaminants present.

The other options, while related to water quality and treatment, do not specifically focus on the requirements for maintaining C x T values in surface water systems. The Safe Drinking Water Act (SDWA) sets overarching standards and mandates for drinking water quality, but it does not detail disinfection parameters like C x T. The Environmental Protection Agency (EPA) is the federal agency responsible for enforcing drinking water regulations, including the SWTR, but it is not a regulation itself