Yes, it is permissible to eat of the dates of the trees which are irrigated with water from the sanitary waste flow because if there is no taste or smell, that means that the najaasah (impurity) has disappeared.
Ruling on using sanitary waste flow to irrigate date palms
Question: 1363
We have date palms which are growing near the sanitary waste flow. Is it permissible to eat of their dates?
Answer
Praise be to Allah, and blessings and peace be upon the Messenger of Allah.
Source:
al-Da’wah magazine, issue# 1798 p/61
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