Eating fruits watered with wastewater

Q 3: I work in Najran at a governmental department that a very big accommodation building belongs to. Among the most important public utilities of the accommodation building concerned are some wells which are used by the drainage system to receive waste liquids. The point is that some fruitful palm trees grow around the edges of these wells. Some people eat from the dates of these palm trees and others refrain from doing so on the grounds that the palm trees concerned feed on water and waste liquids of the drainage system.My question is: Is it permissible to eat such dates of palm trees that only feed on waste liquids of the drainage system including human excrement, or is doing so impermissible just as it is impermissible to eat from the Jallalah (domesticated animals fed on impurities) unless the latter meets certain conditions?

A: If no effect is noticed due to these impurities on the taste and smell of these dates, they will be Halal (lawful) to be eaten on the grounds that permissibility is the original ruling. However, if such impurities affect the taste or smell of the dates concerned, they will be Haram (prohibited) to be eaten.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.