According to the merck index. Harmine chloride dihydrate (the form you would get if you made it a salt with chlorine) is soluble in 40 parts water. That means 1 part harmine to 40 units of water. Freely soluble in hot water. The freebase is slightly soluble in water.

Harmaline freebase is slightly soluble in water. The chloride salt is also moderatelt soluble in water. No more details given.