Well, that depends, in CT, most places that have city water also have city treatment, for all run-off and sewage, but yes,....don't dump anything down the street drain, it's ment for rain water, not chemicals. Dye is dye, it has almost no Ill effect on anything except changing the color, so pouring it down the drain is fine, but if your eco friendly, then put it in with waste coolant or mixed chemicals to be treated at a facility. As far as the dye your hair comment, I might just start doing that, especially since my high school friend last monday looked at me and said holy crap,.....your freakin gray![&o] I just told him I didn't like him anymore and walked away.