Question: what are some of the main causes of water pollution in the united states and canada?
Answer: Runoff from Agricultural Operations. Agriculture represents one of the biggest sources of water pollution in the country. ... 
Runoff and Nonpoint Source Pollution. ... 
Industrial Activities. ... 
Leakage from Underground Storage and Piping. ... 
Leaking Sewers. ... 
Vehicle Emissions. ... 
Landfill Leakage. ... 
Hazardous Waste.