This small river runs 500 meters from our house. In my childhood it was hopelessly polluted, in my mother’s it was crystal clear. In the meantime the main polluter has partially closed, partially changed its methods. As a result the water is said to be quite acceptable again.
I crossed the river to fetch some medication for my father. He was not well but still alive then. It was only a month later we learned that it was hopeless and coming to an end.