Answer:
Someone can be more specific, but I worked at Poland Spring Hotel, which is located in Poland Springs, Maine, just outside of Lewiston, back in the 60s, and there was a spring there on the grounds of the hotel, from which the first bottled water was drawn and sold. Later, the water came from a nearby lake, and now I believe it is drawn from several different sources, all lakes in the nearby region.
Answer
Yes, years ago that is where the water came from. Poland Springs was sued in a class action lawsuit and lost the case because for one thing they said the source was protected.
Currently the water comes from many source, that is why the taste is no longer consistent from case to case. You need to read the individual bottle.
The bottled water industry in general is under pressure since the water is suppose to be more healthy than tap water but it actually does not have to be the case. In addition there is a safety concern about the plastic in the bottles leaching into the water.