When a water supply cannot use a specified treatment technique, what may be granted?

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When a water system cannot implement a mandated treatment technique, a variance provides the regulatory path to allow an alternative approach that still protects public health. It’s a formal modification granted by the state (or EPA) based on site-specific conditions, showing that the substitute method or arrangement achieves an equivalent level of health protection. The variance is time-limited and comes with conditions, monitoring, and a plan for achieving compliance or renewing the approval as needed. This keeps safety intact while recognizing feasibility constraints.

A permit governs general operation and compliance but doesn’t substitute for a treatment technique requirement. An exemption would remove the requirement entirely, which isn’t the mechanism used here. A waiver may apply to certain administrative or non-core requirements, not to replacing a required treatment technique.