The term refers to the water operators managing water services for civil use, from water abstraction for public water supply to the wastewater treatment, operational in the reference year of the data. In order for a unit to be eligible, it must have operated for at least one day in the year. Multiple operators may operate simultaneously in the same area for the same service (in different areas of the same municipality or at different times of the year). Moreover, the same operator may be active in one or more services across one or more municipalities.
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