Many people use Comet or other powdered cleansers around their campsite to keep the ants away. These compounds contain bleach. When it rains, your campsite vegetation will get a bath in bleach. Water spigots are polluted regularly. These areas areas are not for dish washing, hair washing, or dumping.
Vegetation seeks out any source of water.
Dirty dish water can contain all kinds of bacteria. Anything you dump from your dish drainer can contaminate the surrounding area. Be kind to the environment and select an Earth friendly dish detergent especially when camping if you can. Other Chemicals - Chemical toilets and RV's use special chemicals to dissolve the waste. These wastes will clog most public bathrooms and actually erode pumping equipment used to empty pit toilets.