Effluent guidelines are rules that grown-ups in charge of taking care of our water make to make sure that the water we use and drink is clean and safe for us and the animals that live in it. Think of it like a set of rules for keeping your room clean. Your parents might tell you to put your toys away, make your bed, and not leave any food on the floor. The grown-ups who make effluent guidelines tell companies and factories what they can and cannot put into our water. This is important because sometimes companies use chemicals and other things to make their products, and these things can be harmful to us and the environment. So, by making effluent guidelines, these grown-ups are helping to keep our water clean and safe to use for everyone.