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Set up by the City Council, over time MM has become one of the leading companies in public infrastructure engineering and construction management and for the management of the Integrated Water Service. The common denominator in these two lines – water and engineering – is that both are mostly underground. And it is in fact from underground that the water is taken to meet the city’s needs. According to Bonvesin della Riva ((b. ~1240 – d. ~1315), Italian author and poet, in the 13th century there were already some 10,000 artesian wells spread in the Milan area, but the first pumping system was only installed in 1888. Development of the water mains has led to 29 pumping stations to date, along with a vast sewage disposal system and three wastewater treatment plants for the City. Metro system lines also wind their way underground, incorporating all MM design expertise since 1955, when Line 1 was conceived, and through to the present, with the Lines 4 and 5 in different stages of development.

Preparation of the first sewer design dealing with the problem of collecting and disposing of sewage and stormwater in the inner part of the city.
1890 Construction of the water mains to provide drinking water to the city and overcome the problem of bacterial pollution of wells and completion of the “General design for the city’s sewer network”.
1911 Drawing up of the Plan to extend the sewer, the basis for the subsequent development of the Milanese sewer system.
July 1955 The City Council sets the foundation of a specific joint-stock company for the “construction and operation” of the metro, a complex project that under both technical and financial points of view called for a dedicated body. On the 6th October of the same year, in terms of a deed by Notary Cassina, MM S.p.A. was set up. Its first chairman was Mr Ercole Bottani.
October 1955 The newly established company is awarded by the Milan City Council a thirty-year concession to construct and operate the metro lines.
1956 MM starts operations from its first head office at 2, Piazza San Fedele.
May 1957 Excavation for Line 1 begins at the construction site in Viale Monte Rosa.
November 1964 The “red line” (Line 1) is inaugurated and begins its revenue service along 12,5 km (7.3 mi) and 21 stations from Piazzale Lotto to Villa Marelli.
1969 The first section (Caiazzo – Cascina Gobba) of the “green line” (Line 2) is inaugurated with a total of eight stations, three of which (Cimiano, Crescenzago, and Cascina Gobba) are at road level.
1983 The Implementation Plan for the Sewer Network (PARF), based on the law on protecting water resources from pollution, was elaborated. In identifying the works required to extend and complete the sewer network, it was inspired by the need for a sewage treatment system capable of handling wastewater from the entire urban area.
1990 The “yellow line” (Line 3) from the Central Railway Station to Porta Romana is inaugurated, with eight stations.
1999 The Municipal Administration sets up its Integrated Water Service.
2000 The Government appoints an Extraordinary Commissioner tasked with setting up the wastewater treatment system for Milan.
2001 Construction of the three wastewater treatment plants starts in compliance with the EU directive on the subject.
April 2003 The first module of the Milano Nosedo wastewater treatment plant starts operation.
June 2003 MM S.p.A. is appointed by AATO (the local water resources authority) to manage and maintain the Integrated Water Service on behalf of the Milan City Council, the owner of the network and plants. From then on MM has also been responsible for managing the two wastewater treatment plants at San Rocco and Nosedo, while the third one at Peschiera Borromeo is managed by a specialized company Amiacque, formerly CAP Gestione S.p.A.
January 2004 The second module of the Milano Nosedo wastewater treatment plant becomes operative.
December 2004 The Milano San Rocco wastewater treatment plant starts operation.
January 2005 The Milano Nosedo wastewater treatment plant is operating at its full design capacity.
October 2009 The thermal drying section of the Milano Nosedo wastewater treatment plant is commissioned, expected to bring about evident environmental advantages.
February 2011 Inauguration of the extention of Milan Line 2. from Famagosta to Assago Milanofiori Forum. Four new stations: Assago Milanofiori Nord and Assago Milanofiori Forum.
March 2011 Inauguration of the extention of Milan Line 3. Four new stations: Dergano, Affori Centro, Affori FNM and Comasina, the new terminus.