There are many sources of fresh water: rain, rivers, lakes, wells, snow, glaciers. Sea water is not fresh, it is salt water, but even that can be made into fresh water by means of a desalination plant.
Answer
Any source of water that has sewer smell, or that has a chemical rainbow sheen, or a milky color should be avoided. They may contain toxic chemicals that cannot be removed by any purification method used. Chemicals cannot be boiled or distilled out of an affected water source.
Ground water, lake water (usually but not always). All the Great Lakes in the USA are fresh water. Spring water and mountain stream water are also as is freshly collected rainwater.
Rain or snow
lakes. because the question asks for a fresh water source.
Rivers,lakes.ponds,any fresh water source or there are fresh water fish breeders
Lakes
Yes.
The fresh water source that is important to people depends on the nation. In the United States the most important freshwater source is the Great Lakes system.
The Precipitation stage of water cycle provides fresh water to the aquifiers. It is one of the major source of fresh water on earth.
90% of fresh water forms of polar ice caps & glaciers.
nnn
It's fresh. It becomes polluted.
This would depend if the water is from a sea or a river source.
It contains fresh water, which humans can drink
no