Frequent Questions

3. How will I know if disinfectants are in my drinking water?

Public water systems using surface water or ground water under the direct influence of surface water are required to maintain a detectible disinfectant residual in the distribution system. When routine monitoring indicates that disinfectant levels are above the MRDL, your water supplier must take steps to reduce the amount of disinfectant so that it is below that level. For chlorine dioxide, water suppliers must notify their customers as soon as practical, but no later than 24 hours after the system learns of the violation. For chloramine and chlorine, water suppliers must notify their customers as soon as practical, but no later than 30 days after the system learns of the violation. Additional actions, such as providing alternative drinking water supplies, may be required to prevent serious risks to public health.

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