Water pollution is when something gets into the water that makes it unsafe for animals and people to use. Pollution can come from lots of different sources like factories, cars, farms and people using the water for fishing and swimming. Pollution makes the water cloudy, dirty and smelly. It can cause different sicknesses in animals and people if they drink it or even just go in the water. We need clean, fresh water to stay healthy and happy so it's important to help keep it clean. You can help by not throwing trash in the water, reducing the amount of chemicals used in the water and planting trees near rivers and streams.