Pathogens (Disease-causing organisms like bacteria, viruses, and parasites) Example: E.Coli from untreated sewage or animal waste in water Organic Ma

Pathogens (Disease-causing organisms like bacteria, viruses, and parasites) 

• Example: E.Coli from untreated sewage or animal waste in water

Organic Matter (Decomposing plant and animal material that depletes oxygen in water) 

• Example: Sewage and manure runoff that leads to low oxygen levels and harms aquatic life

Thermal pollution (Unnatural Heating of water, which reduces oxygen levels and affects ecosystems) 

• Example: Power plants releasing hot water into reverse, making it harder for fish to survive

Organic chemicals (toxic carbon-based compounds from industry, agriculture, or household waste) 

• Example: Pesticides from farms contaminating lakes and rivers, harming fish and plants 

Inorganic chemicals (non-carbon-based substances like salts, acids, and metals)

• Example: Nitrates and phosphates from fertilizers causing eutrophication (harmful algae blooms) 

Heavy metals (toxic metals that accumulate in living organisms and ecosystems)

• Example: mercury (Hg) from coal-burning power plants, which builds up in fish and poisons predators (including humans)