Answer:
It comes from deep, protected underground aquifers.
Step-by-step explanation:
- The groundwater is a water present beneath the surface deep within the soil pores and fractured rocks. An unconsolidated deposit named as aquifer contains unstable but drinking water, as this water is recharged from the surface.
- It's often regarded as cheap, convenient and pollution-free as most of the industrial and agricultural wastewaters does not reach such great depths.
- Thus making up 20% of the freshwater in the world. And hence regarded as a long term natural water cycle. The groundwater moves around 16 miles per day thus are filtered.