The Anoia (Catalan pronunciation: [əˈnɔjə]) is a river in Catalonia, Spain, a tributary of the Llobregat.

Its has four sources, in the municipalities of Calaf, Sant Martí Sesgueioles, Montmaneu, and Argençola, and these streams join together in Jorba to form the Anoia proper.

[citation needed] As a result of both downstream industry and intensive agriculture in its headwaters, the Anoia became quite polluted.

Closer to Martorell, the automotive industry added electrolytics, nickel, chromes, and cyanides to the water.

[2] Fortunately, improvements in technology and manufacturing processes have reduced the level of pollution in recent years.