Purity: Prohibited Places for Relieving Oneself in Islamic Law
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 60
It is unlawful (ḥarām) for one to empty his bowels and/or bladder in four places:
1. in dead-end alleys without the owner’s consent. The same applies to public alleys and roads in the event that it causes harm to pedestrians;
2. on the property of someone who has not given his consent for one to empty his bowels and/or bladder on it;
3. in a place that is a charitable endowment (waqf) for use by particular groups, such as some schools;
4. on the graves of believers, whether it is disrespectful to them or not, except if the land is al‑mubāḥāt al‑aṣliyyah.[5]1 The same applies to any place where emptying one’s bowels and/or bladder causes dishonour to one of the sacred things of the religion or faith.
-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)
[5] This is property that does not belong to anyone in particular and can be used by people in general.