Drinking water (or potable water) is brought in to urban areas by water utilities to serve lots of people. However, water in the countryside must serve spread-out populations, so wells or no treatment facilities at all are here, mainly because water-delivering infrastructure is expensive to build. Untreated water is often laden with bacterial/viral disease vectors or polluted contaminants. Especially in poor countries, potable water is not often available and they only have streams to collect water from, which are all-to-often contaminated by sewage or livestock effluent.
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