jesus.
Rainwater
Yes it has dirt and chemicals in it.
jesusjesusyes jesus but the "joke's answer is:MUDDER NATURE....LOL!
Humans and their saliva, animals and their waste, anything that you detest...(can't list out everything, there's just too many), if u want list everything out yourself
Wipers
Rainwater litter is probably the little bits of leaves and dirt that collect on your roof and are washed down with the first flush of rain.If you have a rainwater tank you should consider having a "first flush diverter" or a "rainwater litter catcher" so that the litter does not end up in your tank.
S02 is produced by mold. It makes the rain water acidic because when it rains the dirt and pollution in the air are collected and when it floods the pollution an the ground is collected in the water.
Mud
no not unless something is mixed with it that goes rotten but the dirt itself does not rot
Groundwater is rainwater that seeps into the ground, so it might have dirt and minerals and stuff in it besides water.
Rainwater Solutions is one company that makes rain barrels. www.rainwatersolutions.com