It was narrated that ‘Abdullâh bin Mughaffal said: “The Messenger of Allah P.B.U.H said: ‘None of you should urinate in his wash area for most of the insinuating thoughts come from that.” (Da’if)
Abu ‘Abdullâh bin Mâjah said: (“Abul-Hasan said: ‘I heard Muhammad bin Yazidm saying:) Ali bin Muhammad At-Tanâfisi said: ‘This (prohibition) applies to cases where the ground (in the place used for washing) was soft. But nowadays this does not apply, because the baths you use now are built of plaster, Saruf and tar; so if a person urinates there then pours water over it, that clears it away, and that is fine.’”