Metropolitana Milanese is a specialist engineering company operating within the public transportation sector. The Company supplies a full range of services encompassing the entire design cycle, from preliminary studies through to project completion. MM has been supplying project and construction management expertise to administrations and public authorities for more than 50 years, including such key activities as technical support, public and private contract management, evaluation of development proposals, preparation of contract and tendering documents and providing support to the officials in charge of the procedures.

In 2003 the Milan City Council decided to hand over the management of the Integrated water service, to Metropolitana Milanese, taking advantage of its technical and management expertise to improve the quality of water-related services and to implement adequate maintenance and investment plans for the drinking water and sewer systems.