Point Source Pollution is when sources of pollution come to the river at one point. Nonpoint Source Pollution is when sources of pollution have resulted in the disturbance of the earth or contamination of the surrounding land.
Industry plays a major role in point source pollution.
Industrial wasterwater and discharges include oils, greases, metals, chemicals, such as PCB's and pesticides, and debris that eventually head into the Cuyahoga River. Oil spills and dumping also play a major role in point source pollution. Spilled grease, oil, and other hazardous substances from overturned trucks and leaking cars have a major impact by eventually running into rivers and sewers. Also, the disposal of used motor oil and grease affects the water by going into a storm sewer which can overflow into the river, or it will go directly into the river. Thermal pollution decreases the water s ability to hold oxygen.