Do you know of any activity which may be polluting this water source?
The addition of undesirable substances to water bodies. These substances could be the fertilizers and pesticides used in farming or they could be poisonous substances like mercury salts which are used by paper industries.
Releasing drainage water and effluents from industries to nearby water resources.
Releasing super heated water to rivers.
Change in temperature of river water. These are the activity from which water gets polluted.
