• In a change that will take effect on New Year's Day, the U.S. Environmental Protection Agency will allow a single apartment or condominium qualify for its WaterSense label to appeal to green tenants and buyers.
• It is not a completely free pass, however. Common areas of the building – indoors and out – will have to met some standards.
• For single-family homes to be labeled WaterSense houses, builders will have to use the EPA's online Water Budget Tool in planning landscaping and meet some other new standards, too.

From the article:

New standards for the WaterSense label, released last week by the EPA, now allow individual apartments and condominiums to qualify for the designation. ...