From Longman Dictionary of Contemporary Englishfresh waterfresh waterfresh water contains no salt and comes from rivers and lakes → saltwater → fresh
Examples from the Corpus
fresh water• Most have been seen at Chichester gravel pits, but the species may occur on any stretch of fresh water.• The puffer fish is found in warmer parts of the world both in sea water and fresh water.• McLaren concludes that the former mechanism is numerically untenable because there is not remotely enough fresh water and ice in the world.• There he knew he would find fresh water for his men, to soothe the dying and sustain the living.• There is a fresh water pool, tennis court, peak season beach restaurant and sound proofed discotheque.• There is a fresh water pool with bar, a panoramic sunbathing terrace and an airy, first-floor restaurant with sea views.• The island has no roads, one cellular phone and a fresh water supply that comes from the sky.• Rinse it well for an hour in running fresh water to prevent it from turning yellow because of bleach residue. 