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There are several levels of wastewater treatment; these are primary, secondary and tertiary levels of treatment. Most municipal wastewater treatment facilities use primary and secondary levels of treatment, and some also use tertiary treatments.
Safe Drinking Water Foundation web site containing information about the organization, its educational programs, and water quality issues and solutions.
Wastewater Treatment — Safe Drinking Water Foundation
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Comparison of potential drinking water source contamination across one hundred U.S. cities
