"We have mobilized 14 fire engines to dispatch fresh water to eight villages in the township," said Wu Jianliang, the head of Maogang, according to a report on eastday.com.
"Supermarkets and small shops were also contacted to deliver 5 liters of clean water to each household to ensure residents have access to drinking water," he added.
Bottled water at local supermarkets was still sold out on Friday, with residents standing in long lines to fetch water dispatched from fire engines.
Authorities in nearby neighborhoods were also ready to offer clean drinking water, once their water sources had been tested.
"We have launched an emergency plan and are standing by," said Bao Linjun, an official with the Lindong neighborhood committee in Jinshan district.
"We have notified Hualian supermarkets to offer bottled water if required. But currently the water source remains unaffected in our region."
Authorities, meanwhile, have intensified their inspections at rivers in Songjiang, Minhang, Jianshan and Qingpu districts, taking tests every hour.
The environmental protection department said the air quality has improved, though the pollutants had drifted to Jiashan and Pinghu in nearby Zhejiang province by early Friday.
Police said they are still investigating the incident.