The Messenger of Allah (ﷺ) forbade to urinate in stagnant water.
Sahih Muslim Book 2, Hadith 121
← Previous Hadith " He (the Holy Prophet) gave concession in the case of the dog for looking after the herd, for hunting and for watching the cultivated land," and there is no mention of this addition (i. e. concession in case of watching the cultivated lands) except in the hadith transmitted by Yahya.

Sahih Muslim Book 2, Hadith 120 Next Hadith → the Messenger of Allah (ﷺ) said: None amongst you should urinate in standing water, and then wash in it.

Sahih Muslim Book 2, Hadith 122