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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.
Perceived drivers and barriers in the governance of wastewater treatment and reuse in India: Insights from a two-round Delphi study - ScienceDirect
Setback distances between small biological wastewater treatment systems and drinking water wells against virus contamination in alluvial aquifers - ScienceDirect
Would you drink toilet water? California approves wastewater for human consumption, Water
Human Water Cycle: Wastewater
Underground Storage Tanks for Potable Water. Effluent, Waste & Slurry, small water storage tank
The Dangers of Sewage In Drinking Water - SpringWell Water Filtration Systems
Caawef - California African American Water Education Foundation
Cobertura Vegetal y Erosión Evitada, PDF, Agua
U.S. Wastewater Treatment Factsheet