1772/1 - Jābir (may Allah be pleased with him) reported: “The Messenger of Allah (may Allah’s peace and blessings be upon him) forbade urinating in stagnant water.” [Narrated by Muslim]
Stagnant water is the water that does not flow, like that of a small pond.
1) It is prohibited to hurt Muslims by words, like cursing and reviling, or by actions, like urinating in the sources of water.
2) One of the great aspects of the Islamic Shariah is that it urges people to do what maintains their health and that of the whole society. That is why it forbids urinating in still water.