Catalyzes the hydrolysis of epoxide-containing fatty acids. Active against epoxyeicosatrienoic acids (EETs) including 8,9-epoxy-(5Z,11Z,14Z)-eicosatrienoate (8,9-EET), 11,12-epoxy-(5Z,8Z,14Z)-eicosatrienoate (11,12-EET) and 14,15-epoxy-(5Z,8Z,11Z)-eicosatrienoate (14,15-EET) and the linoleic acid metabolites 12,13-epoxy-(9Z)-octadecenoate (12,13-EpOME) and 9,10-epoxy-(12Z)-octadecenoate (9,10-EpOME). These epoxides function as lipid signaling molecules, the enzyme can deplete the supply of the epoxide signal by transforming them into diol species that are more readily eliminated through excretion.