Is it permissible to perform istinja' and wudu' in the water of ponds if one of its characteristics has changed?

Question:
Peace be upon you. He also asked: Is it permissible to perform istinja' and wudu' in the water of the ponds around the mosques, when its color and taste have changed, and it is stagnant and not moving? And what is the quantity of pond water that makes it valid for wudu'?

Answer:
The default ruling for water is that it is purifying; one performs wudu' with it and takes a ghusl with it from janabah, except if its color, taste, or smell changes due to impurity, in which case it becomes impure. If this change mentioned by the questioner is due to impurity, then it is impure, and it is not permissible to use it. Yes, yes.