I would not eat anything from Dianchi lake.

I understood they cant even use the water for irigation due to heavy metals.

The Dianchi Lake Scenic Area is located in the southwest part of Kunming City. Dianchi Lake is, beyond question, the center of the resort. There are numerous attractions along the lake captivating tourists. Among these are the Yunnan Ethnic Villages, Daguan Park, Baiyukou Park, Haigeng Bank, Kwan-yin Hill, Xishan Forest Park, temples and pagodas.