The site already uses reclaimed water for irrigation provided by the water utility or reuses graywater from the building for irrigation. Can the building still qualify for the credit?

Yes, if 100% of the water used is from reclaimed water, graywater, or harvested rainwater, the project is eligible for all five points. Use the alternative compliance path on the LEED Online form and include an explanation of the situation along with a signed letter by the property manager, facility manager, or owner verifying the use of non-potable water.