said by sk1939:Bleach will also kill the roots of your lawn, and will poison your water if you have a well.
it'll sink down below the roots, never had a problem before using it on yellow jacket wasp nests underground. and also, it will NOT poison a well, water companies add chlorine to the water, and people that have wells add bleach to them to kill bacteria, and keep the water clear. you'd have to add quite a LOT of bleach to a well to poison it, and the chlorine only lasts a fairly short time anyway.