How would the project perform the Water Efficiency Credit, Indoor Water Use Reduction calculations?

A renovation project includes both a new kitchen sink and shower and an existing lavatory and water closet within the LEED project boundary.

How would the project perform the Water Efficiency Credit, Indoor Water Use Reduction calculations?
A . Include only the newly installed fixtures and exclude the existing fixtures
B . Include only the existing fixtures and exclude the newly installed fixtures
C . Include all fixtures (new and existing); the baseline for the existing fixtures would be the flush/flow rates of the existing fixtures prior to retrofit
D . Include all fixtures (new and existing); the baseline for the existing fixtures would be the same baseline flush/flow rates used for the new fixtures

View Answer

Answer: D

Explanation:

For the Water Efficiency Credit, Indoor Water Use Reduction calculations, all fixtures within the LEED project boundary must be included, both new and existing. The baseline for the existing fixtures should be the same as the baseline flush/flow rates used for the new fixtures. This approach ensures a consistent and fair comparison between the current and proposed water use.

Reference: LEED v4 ID+C Reference Guide1

Indoor Water Use Reduction Calculator instructions2

LEED v4 water efficiency credit requirements3.