Do splashes of sewage irrigation water on clothes cause them to be Najis?

Q: In the Armed Forces Hospital, in Riyadh and Al-Kharj, there are green areas and flowers which are watered by the sewage of the hospital after draining it.Throughout the process of watering, the clothes of the passersby and the workers may be soiled, bearing in mind that this water sometimes smells bad.Your Eminence, I hope you could give us a Fatwa concerning the purity of the clothes in this case. Here attached is the letter of the Technical Affairs Department about the process of water purification.May Allah reward you with the best and keep you for the service of Islam and Muslims.

A: If the water that is pumped into gardens and trees bears one of the characteristics of Najasah (impurity) that affects its taste, color, or smell, it is Najis (ritually impure), and it renders whatever it touches of a place or a person's body or clothes Najis. However, if these three characteristics are removed, then whatever this water comes into contact with will not become Najis.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.