How does agriculture pollute water?
Polluting material reaches the ground water by leaching or by mixing with surface water of rivers, lakes and ponds by runoff and drainage.
Agriculture pollutes water by runoff from these agriculture areas:
Runoff rinses these polluting elements into the water:
- fertilizers (nitrogen, potassium, and phosphorous)
- livestock waste
- oil and toxins from farm equipment
- soil and sediment (This runoff also erodes the land)
The runoff of excess agricultural fertilizers may cause
Here's a Khan Academy presentation of eutrophication that you might like to see: