Water Pollution - What Causes It?

The UN says that most water pollution problems are caused by agriculture, industry and untreated wastewater. Water on our planet now is the exact same water that the dinosaurs were drinking. We don't ever get new water. It basically gets recycled by being evaporated where it turns into clouds and falls back down again as rain or snow or fog. How we deal with wastewater is very important, and most important is how we deal with poo in the water.