  We examine the current constraints and future sensitivity of Coherent Elastic
Neutrino-Nucleus Scattering (CE$\nu$NS) experiments to mixing scenarios
involving a $Z^\prime$ which interacts via portals with the Standard Model. We
contrast the results against those from fixed target, atomic parity violation,
and solar neutrino experiments. We demonstrate a significant dependence of the
experimental reach on the $Z'$ coupling non-universality and the
complementarity of CE$\nu$NS to existing searches.
