Pittsburgh's combined stormwater and sewer system overflows when it rains a lot, and that sewage seeps into the Ohio River, creating toxic algae blooms that are harmful to life in the river and to people.
People Also Ask
The Mississippi RiverHowever, the river has also been heavily impacted by pollution from agricultural runoff, industrial discharges, and discharge of sewage. Perhaps the river which is genuinely the most polluted in the US is the mighty Mississippi.
The Congo is the deepest river in the world. Its headwaters are in the north-east of Zambia, between Lake Tanganyika and Lake Nyasa (Malawi), 1760 metres above sea level; it flows into the Atlantic Ocean.