THALIS E.S.  is active in the environmental sector and offers effective solutions to complex problems: THALIS E.S. projects are affecting hundreds of thousands of people in Greece and other countries. They upgrade the quality of people’s life, improve the sustainability of economic activities and restore the environment. THALIS E.S. is registered as a 5th class contractor of the Greek Register of Public Works Enterprises officially kept by the Ministry for Public Works of the Hellenic Republic. The company is also certified according to DIN EN ISO 9001:2008, ISO 14001:2004 and OHSAS 18001:2007and is developing a CSR profile according to ISO 26000:2010 .