Water safety is one of the main concerns for the relief work in quake zone as health relief workers monitor water quality.

The Zhaqu river is one of the main branches of the headwaters of three major rivers. This health worker tests the water quality every morning.

A health worker said, "About 20,000 people drink water from this river, so we take the job very seriously. The testing result today...All the indexes fulfill the standards of drinking water."

Suolan Yongtsuo and her mother draw water from the river three or four times a day. She says the local government has delivered some mineral water, but they leave that water to their injured neighbors.

This health worker told them how to use river water safely.

A health worker said, "Please don't drink it directly. Boil it first. Remember? When you use it to cook rice, please add a disinfectant tablet. Half a tablet for such a basin of river water."

Meanwhile, power supplies in the quake zone were almost fully restored as of Monday.

All 45 villages in Yushu prefecture had contact restored with the outside world Monday after telecommunications resumed in the county seats last week.