water hog

noun

informal a person who uses water selfishly or irresponsibly, esp during a water shortage

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Examples from the Web for water hog

Historical Examples of water hog

The creature made little or no resistance; and having dragged it up to the fire, we saw that it was a capybara, or water-hog.
The Young Llanero
W.H.G. Kingston
Why does it allow a water-hog to fatten at the expense of those whom it holds in its iron grasp?
The Discards
Lucullus Virgil McWhorter
The water-hog (P. khk-b, Platanista gangetica, the porpoise) is another.
The Bbur-nma in English
Babur, Emperor of Hindustan
They are partly webbed, and thus adapted to the aquatic life it enjoys, and which has gained for it the name of the water-hog.
The Western World
W.H.G. Kingston