Construction of a controversial pulp paper mill in 2007, on the Uruguayan side of the Uruguay River, caused protests in Argentina over fears that it would pollute the environment and lead to diplomatic tensions between the two countries. The ensuing dispute remained a subject of controversy into 2010, particularly after ongoing reports of increased water contamination in the area were later proven to be from sewage discharge from the town of Gualeguaychú in Argentina. In November 2010, Uruguay and Argentina announced they had reached a final agreement for joint environmental monitoring of the pulp mill.