Want to immigrate to Australia, is the water supply and drainage major a civil engineer or an environmental engineer in the Australian skilled immigration major?

It must be an environmental engineer. Water supply and drainage specialty is the name of the former Soviet Union in China, and it is still only used in the former Soviet Union and a few countries in Eastern Europe.

Many European and American countries have incorporated this major into environmental engineering. There is no doubt that the drainage part belongs to environmental engineering, and some countries, such as China, classify the water supply part as applied chemistry.