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STA is certified according to the environmental quality system ISO 9001, ISO 14001 and ISO 45001 for the "management system for health and safety at the workplace".
The purpose and field for the "design, construction and operation of water treatment plants and sludge disposal, recovery and disposal of waste, reclamation works, drinkable water plants".

The system for quality management aims to systematically provide products that meet customer requirements and in regulated areas to ensure that the primary goal of STA is aimed at customer satisfaction through an effective system of quality management, including processes related to continuous improvement and the prevention of nonconformity. To do that STA has set up an organizational structure that can handle all processes of the various business activities.

STA is accounted with SOA certification, issued by Authorized Certification Body with Presidential Decree 207/2010 in the following categories:

Category Ranking Activities
OS22 VI Waste water & drinking water treatment plants construction
OG6 I Aqueducts, gas pipelines, irrigation and evacuation
OS30 II Internal electrical installations, telephone, radio and televisioni
OG1 V Civil and industrial buildings
OS6 III Finishing of general works in wood, plastic, metal and glass materials
  VIII Design
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