Disease caused by water pollution

The WHO reports that 25-30% of all hospital admissions are connected to water borne bacterial and parasitic conditions, with 60% of infant deaths caused by water infections.
The long-term effects on human health of pesticides and other pollutants include colon and bladder cancer, miscarriage, birth defects, deformation of bones, and sterility.

Contamination of fresh water with radionuclides, which can result from mining, testing, disposal and manufacturing of radioactive material, as well as transportation accidents, has led to increased incidences of cancer, developmental abnormalities and death.

Cesspools of stagnant dirty water, both in rural and urban areas, account for a large number of deaths caused by potentially fatal diseases like cholera, malaria, dysentery and typhoid.
Nitrate concentration in water above 45mg/l makes it unfit for drinking by infants. The nitrates are reduced in body to nitrites and cause a serious blood condition called the "Blue Baby Syndrome". Higher concentrations of nitrate causes gastric cancer.
Untreated and highly toxic industrial sewage is also used for irrigation near major cities. This can contaminate crops and consequently affect consumers.

Karachi's untreated wastewater from domestic sewage and industrial estates is discharged into the Layari and Malir rivers, which fall into the Arabian Sea. This waste has begun to pose a serious threat to the marine environment, as the channel water is contaminated not only with bacteria but also with toxic chemicals.
Water pollution also extends a savage threat to wildlife of Pakistan. Animals drink water out of polluted water bodies, ailing ponds, rivers and streams. This sickens the animals and some may even die. Oil spills kill thousands of fish in oceans. Extreme pollution of river Ravi has destroyed the once existing 42 species of fish and the bird life around the river has migrated to other areas. Survival of small invertebrates, micro fauna and flora is also threatened.