Question

why is most of the underground water not suitable for human consumption and agriculture​

Answer 1

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Groundwater near farms contains pesticides and insecticides. These get mixed with the water due to the runoff from farms. The chemical in these pesticides can be lethal in heavy doses or when consumed for a long time. Groundwater in some areas is unfit for consumption.

Explanation:

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Answer 2

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When it comes to drinking water, you must be very careful about the source. It is often believed that groundwater and well water is safe to drink because it flows underground and doesn’t come in contact with the surface contaminants. But how far is this claim true? Let’s find out.

Groundwater is basically rainwater that gets seeped through the Earth’s surface into the ground, passing through porous rocks, cracks and spaces. The water gets stored underground and wells are drilled through these rock formations to get access to this groundwater.

Even though groundwater is deemed safe to drink, you must have it tested for pollutants and chemicals. It definitely won’t have the surface pollutants but it may have the run-off pollutants in it.