Law and household bleach

This may seem a bit random, but I'm sure I once read that someone is not allowed to pour bleach down a drain as it harms the environment, but of course, people do it all the time. So, I was wondering if any of you "law" guys knew anything about this? Are there any other laws on bleach we should be aware of? I believe it comes under the Control of Substances Harmful to Health at work thing.

If I'm honest I have a pathological hatred of bleach, and would like to see it banned. But no one else seems convinced despite that it is deadly toxic, can cause serious skin and breathing issues, kills animals, destroys wildlife and is an invention of Satan (I just added that for effect).

Cheers and hope you had a good christmas!!