If one of the three characteristics of water is changed with najasah, it becomes Najis: its taste, smell or color.

In Pakistan, the sanitation system is not good and when it rains, the gutters are overflowed. There remains no distinction between the rain water and the filthy water of the gutters. On our way to the masjid, our lower garment and the feet are dipped in that water. Will this water and our clothes be considered as Najis?