As of Monday, about 2,800 pigs have been taken out of a Shanghai river since Friday, which has many concerned about their tap water.

According to Hong Kong CNN, the pigs came from the upper waters of the Huangpu River, which flows through Shanghai and is a source of drinking water for the city. The reason why the pigs were dumped in the river is unclear, but many pigs have been dying in the last two months in the area because of a disease, according to the news source.

"According to our records, 10,078 pigs died in January, another 8,325 died in February. More than 300 pigs die everyday in our village, and we barely have any space left to dispose of the dead pigs," a local villager said in a local paper, according to CNN.

Xinhua Net reports that residents have been dumping pigs in the river since March 4.

A local resident, business investor Xue Manzi, posted on the social media site Sina Weibo, "Huangpu river is the source of drinking water for more than 20 million Shanghai residents. And this horrific incident was only made public when residents started posting pictures on Weibo."

The Shanghai Municipal Agricultural Commission explained that the water quality in the section of the river where most pigs were found was still normal and that the pigs haven't had a significant effect on tap water.