The biological activity of organotin wood preservatives is essintially dependent on the type and structure of R3Sn group, bat unaffcctcd by the nature of anionic group X. A total number of 9-12 carbon atoms in R3Sn group performs the highest fungal toxicity. However, X group affects its solubility. When X=R'S03 in R3SnSO3 R', the aqueous solubility becomes 0.1-1.5% w/v. When R=n-C4H9, R'=C2H5 it reaches remarkbly high (1.1-1.5%). The synthesis and the water solubility of water borne triorganotins are described.