  In this work, we investigate the beyond standard model (BSM) impact of
leptophilic U(1) models, namely $ U(1)_{L_\mu-L_e}$, $U(1)_{L_e-L_\tau}$ and
$U(1)_{L_\mu-L_\tau}$ on coherent elastic neutrino-nucleus scattering
(CE$\nu$NS) and hence its effect on dark matter (DM) direct detection
experiments. Imposing the latest relevant experimental constraints on these
models, we obtain $\mathcal{O}(50\%)$ enhancement for case of
$U(1)_{L_\mu-L_\tau}$ in a region $m_Z' \approx 20~$MeV. Subsequently, we
observe that the enhancement seen in CE$\nu$NS is roughly getting translated to
enhancement by a factor of 2.7 (for Germanium based detectors) and 1.8 (for
Xenon based detectors) in the neutrino scattering event rate which eventually
enhances the neutrino floor by same amount. This enhancement is more prominent
in the region with DM masses less than 10 GeV. The model parameter space that
leads to this enhancement, can simultaneously explain both anomalous magnetic
moment of muon ($(g-2)_{\mu}$) and observed DM relic density, in a modified
scenario. Enhancement of neutrino floor requires increased number of DM-nucleon
scattering events in the future DM direct detection experiments, to establish
themselves to be DM signal events. In absence of any DM signal, those
experiments can directly be used to measure the neutrino rate, quantifying the
BSM effects.
