Little water pollution has been detected at the Three Gorges Dam area since the water level of the gigantic dam reached the 156-meter mark on Friday, the latest monitoring reports show.

The dam area has maintained a sound ecological environment and water in the dam area is still potable, according to Hubei provincial government office in charge of water-pollution control in the Three Gorges Reservoir.

At 156 meters, the Three Gorges Project, which is believed to be the world's largest hydropower project, is fully functional in terms of flood-control, power generation and navigation. The reservoir has stored more than 10.5 billion cubic meters of water.

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