Depends on the part of the United States. California has laws mandating low-flow toilets, showers, and interior faucets. That's been the code for the last 20

Depends on the part of the United States. California has laws mandating low-flow toilets, showers, and interior faucets. That's been the code for the last 20 or so years. Last year California became the first state to require re-fitting all existing structures with low-flow systems: http://www.huffingtonpost.com/2013/08/23/low-flow-toilets-required_n_3800061.html http://www.huffingtonpost.com/2013/08/23/low-flow-toilets-re...