  We consider the hydrodynamic regime of a 2+1 dimensions QFT with the parity
anomaly. Beyond the known constraints from positivity of entropy production, we
show that the anomaly inflow mechanism, from a corresponding bulk SPT phase,
together with thermodynamic consistency of equilibrium partition functions,
restricts the form of non-dissipative transport coefficients. This included the
known form of quantised Hall conductivity, which is fixed to be $\sigma_{xy} =
e^2/2h$, along with new constraints on other three non-dissipative parity-odd
transport coefficients.
