Which is an example of a low-cost Water Efficiency strategy?

Which is an example of a low-cost Water Efficiency strategy?
A . Install new flush valves or flow restrictors
B . Install subsurface cisterns to collect stormwater
C . Use only compostable toilets throughout the facility
D . Incorporate an on-site blackwater treatment system

Answer: A

Explanation:

Installing new flush valves or flow restrictors is a low-cost strategy to improve water efficiency. These devices reduce the amount of water used in each flush or flow, leading to significant water savings over time. Other strategies like installing subsurface cisterns to collect stormwater, using only compostable toilets throughout the facility, or incorporating an on-site blackwater treatment system can also improve water efficiency, but they typically involve higher upfront costs.

Reference: LEED Green Associate Candidate Handbook, U.S. Green Building Council resources