When a water supply can't use a specified treatment technique, a what can be granted?

Prepare for the American Water Works Water Treatment Plant Operator Test. Study with multiple choice questions, each with hints and explanations. Get ready to excel!

When a water system can’t use a specified treatment technique, a variance can be granted. A variance is a formal exception from that treatment-technique requirement, allowing an alternative approach or timeline that still protects public health, but only under standards set by the state or regulatory agency. It isn’t a blanket permission; it comes with conditions, ongoing monitoring, and usually a time limit for reevaluation. The other options don’t fit because a permit is about operating authorization, and a waiver or rejection isn’t the formal mechanism used to authorize a deviation from a prescribed treatment technique.