The froth floating in the Balsillas river, according to the local administration, is caused by detergent waste poured into the river.
However, Mosquera neighbours complained that the foam was not just soap and that its residues were corrosive, seriously affecting the community.
A local shopkeeper Luis Romero complained about losing clients. He states that every time the foam appears, customers flee because of the foul odour.
"Health, that's the problem. This foam affects everything; for example, foam falls on the doors, and everything rots," Romero said.
Claudia Esperanza Garzon, a resident, told Reuters that her health has deteriorated since the foam appeared.
"I have to use an inhaler because my lungs are already bad," said Garzon while sweeping foam from his house.