Dipole Moment of Normal Water vs Heavy Water
There is no measurable difference.

HOH 1.8546 ± 0.0006 D  

DOD 1.8558 ± 0.0021 D

Dipole moment of water from Stark measurements of H2O, HDO, and D2O J. Chem. Phys. 59, 2254 (1973)