About Waste Management in Agios Konstantinos (Ano Liossia Attica): Do you need Waste and Sewage Management? Find the ideal Waste and Sewage Management company in the Agios Konstantinos (Ano Liossia Attica) area to manage waste and sewage easily, quickly, and safely. See why you should ... choose one of the following waste and sewage management companies in the Agios Konstantinos (Ano Liossia Attica) area. A company specializing in waste and sewage management can: guarantee safe transport of sewage and industrial waste, handle processing of sewage, solid waste, and liquid waste, and finally offer – if needed – biological unit cleaning, non-hazardous sewage collection and hazardous waste collection, as well as waste analyses.