Install a faucet aerator

If you have someone in your house who like to leave the faucet running, did you know that if you install a faucet aerator you will cut down the volume of water waste. Of course getting them to turn off the faucet is ideal, but sometimes retraining people can be a chore. A aerator only cost a few bucks and typically screws onto the end of your current faucet, so its easy enough for about anyone to install.

Pic pulled from Living Simply