Most groundwater, assuming it is unpolluted is actually healthy enough to drink on it’s own. However, in order to make sure it goes through the same filtration process as would recycled sewer water. The water is first strained for large sediments then is purified and neutralized with iodine and other chemicals.
Some water treatment facilities will also use advanced filtering technologies such as reverse osmosis as a tertiary step beyond chemical and settling pond treatment. Occasionally, a fourth step of UV light treatment is done to further destroy any pathogens that were able to pass through the other filters.
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