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Our plumbing fixtures are served, in part, by nonpotable water. How do we account for this?

Nonpotable water cannot be applied to the prerequisite calculation, but it can contribute to compliance for the corresponding credit. Once the annual design case water is calculated, nonpotable water can be subtracted to determine total water savings.

Question: 

Our plumbing fixtures are served, in part, by nonpotable water. How do we account for this?