Question

why is using surface water as a primary drinking water source problematic? because surface water evaporates too easily because surface waters are easily contaminated because not many people live near surface water

Explanation:

Surface water is in contact with the environment. It can be contaminated by various sources like industrial waste, agricultural runoff, and sewage. Evaporation is a natural process but not the main problem for drinking - water source. Also, many people do live near surface water (e.g., rivers, lakes).

Answer:

because surface waters are easily contaminated