Shanghai environmental and water departments are keeping a close watch on the water quality, and have increased patrols on the river.
The quality of water from the upper reaches of the Huangpu River was reported as stable and was unchanged from last year, officials said.
Water from plants in Songjiang, Jinshan, Minhang and Fengxian also met national standards, the Shanghai government added.
The recovery of the pig carcasses continues, authorities said.
Chen said the incident highlighted that various measures need to be strengthened and improved.
He added that it was also necessary to improve the levels of health and environmental education among farmers, suggesting there should be a system of rewards and subsidies for those implementing the safe treatment of dead animals.
When a problem is identified, it should be reported to authorities immediately and dealt with quickly, Chen said.
Animal epidemic protection work should also be strengthened, to reduce future deaths, he added.
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