When MCLs are exceeded for inorganic chemicals, what is required?

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When an MCL is exceeded for inorganic chemicals, informing the public is required. This public notification is a regulatory obligation to alert customers about potential health risks and any steps they should take, such as avoiding use of water for certain purposes or following health guidance. It ensures transparency and protects public health while the system works on corrective actions to reduce the contaminant.

Shutting down the plant is not the immediate requirement for a chemical MCL exceedance, and it would be an extreme response not typically necessary for such a violation. A boil water advisory is reserved for microbial contamination, not inorganic chemical exceedances. Increasing the disinfectant dosage doesn’t address inorganic chemicals and could create other water quality issues. Public notification directly communicates the issue to consumers, which is why it is the correct choice.