Guandu River (Rio de Janeiro)
Encyclopedia
The Guandu River is a river of Rio de Janeiro
Rio de Janeiro (state)
Rio de Janeiro is one of the 27 states of Brazil.Rio de Janeiro has the second largest economy of Brazil behind only São Paulo state.The state of Rio de Janeiro is located within the Brazilian geopolitical region classified as the Southeast...

 state in southeastern Brazil
Brazil
Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...

. This river together with the Paraíba do Sul River are the most important in the Rio de Janeiro
Rio de Janeiro (state)
Rio de Janeiro is one of the 27 states of Brazil.Rio de Janeiro has the second largest economy of Brazil behind only São Paulo state.The state of Rio de Janeiro is located within the Brazilian geopolitical region classified as the Southeast...

 state.

The river supplies water to 9 million people in the Rio de Janeiro metropolitan area.

Pollution

Guandu river is heavily polluted since it receives everything from raw sewage to industrial waste
Industrial waste
Industrial waste is a type of waste produced by industrial activity, such as that of factories, mills and mines. It has existed since the outset of the industrial revolution....

 throughout its course.

The pollution problem is so serious that it threatens the water supply of the Rio de Janeiro metropolitan area. CEDAE, the water and sewer company of the state, recognizes that the problem is very serious. CEDAE also admits that because of the high levels of pollution, purification of Guandu's waters is a challenge.
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