We've been working alongside ToolBox Design with Wessex Water on a game to help people understand what can (and can't) be put down the drain. Tomas has written a little about the project:
Above is an image of two critters in the most recent Wessex Water magazine that dropped though my letterbox. They are the stars of a new iPhone/iPod game that I've been working on along with the nice people of ToolBox Design. This cute little bundle of digitally-smelly fun is a game that as well as being enjoyable, also teaches the player about what waste you should and shouldn't put down the drain or flush down your loo. The serious message behind the game is that putting the wrong stuff into the sewer system not only risks creating a blocked drain for you (eew!) but can also have knock-ons that waste lots of water and could cause environmental damage. See here for more information.