Answer:
Around the world the most significant restriction on access to potable water is money. While access to raw water sources, clean or otherwise, is important, the purification process itself is expensive. Once water has been rendered potable, it is important that it be delivered without reintroducing contamination.
This is true because 6 and 15’s sum is 21.
Moosehead Lake. ...
Sebago Lake. ...
Chesuncook Lake. ...
Mooselookmeguntic Lake. ...
East Grand Lake.