A man has died after falling into a sewage tank while taking samples at the Eastern Treatment Plant in Melbourne’s south-east.

A police spokesman said the 52-year-old man, a lab technician at the Melbourne Water site, fell into an aerated sewage tank at the Bangholme plant, near Dandenong, just before 10am. Police say there is no chance he could have survived.

A tank at the Eastern Treatment Plant in Bangholme, where a worker has fallen to his death.

The man's body was discovered after the tank was drained.

Radio 3AW has reported the man had not been seen since 9am. His equipment, including safety gear, was found near the 1.5 million litre tank.