There are seven operating malt distilleries on Islay -
Bunnahabhain
Bruichladdich
Bowmore
Caol Ila
Laphroaig
Ardbeg
Lagavulin
There was an eighth malt distillery, Port Ellen, which closed sometime around 1983 (?).
There is also an industrial maltings at Port Ellen.
There is talk of a new farm-style malt distillery opening on Islay in the not-too-distant future.
In short, there are no grain distilleries on Islay!
Cheers,
Admiral