Question

What is the gallon to use in new toilets according to Federal plumbing standards?

(a) 1.6

(b) 2.5

(c) 3.9

(d) 4.3

I have been asked this question during an online interview.

Query is from Water Conservation, Rainwater Harvesting, Watershed Management topic in section Social Issues and the Environment of Energy Management

Answer 1

Right choice is (a) 1.6

To elaborate: Old toilets can use 3.5, 5, or even up to 7 gallons of water with every flush. Federal plumbing standards now specify that new toilets can only use up to 1.6 gallons per flush and high efficiency toilets that use up to 1.28 gallons.