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We make use of the absence of Lense-Thirring precession of the innermostmegamaser clumps around black holes in order to place upper limits on the spinamplitude of seven black holes at the center of megamaser galaxies: NGC 4258,NGC 2273, UGC 3789, NGC 3393, NGC 5495, NGC 5765b, and UGC 6093. Theconstraints are derived by requiring that the associated precession time-scalebe longer than the age of the megamaser clumps, in order to preserve thesingle-plane geometry of the megamasers.

Constraining Black Hole Spin based on the Absence of Lense-Thirring Precession of Megamaser Clumps