The data are collected from reports submitted by Public Utility Companies to the Environmental Protection Agency. Public Utility Companies that own wastewater treatment plants (WWTPs) are legally obligated to prepare these reports and monitor the quality of wastewater before and after treatment, with the methodological approach based on provisions of subordinate legislation. Wastewater quality data and criteria for the degree of treatment formed the basis for calculating indicators of treatment efficiency.
General explanation of the data producer’s knowledge about the lineage of a dataset
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