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Actually it does not, was explained by oda in a SBS…search it out
Actually, Oda explained in an SBS that it does. All water affects devil fruit users (with the exception of stuff like rain or waves, which wash over a character too quickly) though it affects them depending on how much water they are submerged in. Specific SBS, I can't find, but the One Piece wiki has this to add:
Oda stated in SBS that Devil Fruit users are susceptible to all types of water, not just seawater. He elaborated on this, saying that "moving" water, like rain or waves, does not weaken Devil Fruit users, while standing water does. If a user is not completely submerged, they can still use their powers from the parts of their body that are above the water. This was demonstrated by Kalifa, who was still able to produce bubbles from the parts of her body that were not under her bath water (although, as stated by Nami, this had effectively cut her strength in half while in the water). However, if the user's body has been permanently altered by the fruit, then the user's ability can be manipulated by outside sources; i.e., when Luffy was knocked into the pool at Arlong Park, Genzo and Nojiko dove underwater and stretched his neck so his head would be above water.
Take from that what you will.
All water affects devil fruit users.
Definitely ain't Locke.