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River pollution in the metropolitan area of   Milan

The River   Lambro drains a very densely populated and heavily industrialized zone,   including a significant portion of the Milan metropolitan area with a   population of more than three million. Before the construction of a treatment   plant in 2002, almost all of the sewage from the city of Milan, as well as   industrial sewages flowed untreated into the river. The Lambro is considered   to be one of the most polluted rivers in Italy: its basin was declared at   high environmental risk area in 1987. Many fish species which used to live in   the river have, as a result, disappeared, including for example the bleak (Alburnus alburnas), the eel (Anguilla anguilla), and the European   perch (Perca fluviatilis). The   situation was even worse after an environmental disaster in 2010, when a huge   quantity of oil was criminally dumped into the river, causing unprecedented   damage to fauna in particular (Salvini, 2011).