diff --git a/model/src/w3initmd.F90 b/model/src/w3initmd.F90
index 0f1362277..8e76c953f 100644
--- a/model/src/w3initmd.F90
+++ b/model/src/w3initmd.F90
@@ -448,7 +448,9 @@ SUBROUTINE W3INIT ( IMOD, IsMulti, FEXT, MDS, MTRACE, ODAT, FLGRD,  FLGR2, FLGD,
     use w3timemd,        only : set_user_timestring
     use w3odatmd,        only : runtype, restart_from_binary, use_restartnc, user_restfname
     use w3odatmd,        only : logfile_is_assigned
+#ifdef W3_MPI
     use wav_restart_mod, only : read_restart
+#endif
     !/
 #ifdef W3_MPI
     INCLUDE "mpif.h"
@@ -972,13 +974,17 @@ SUBROUTINE W3INIT ( IMOD, IsMulti, FEXT, MDS, MTRACE, ODAT, FLGRD,  FLGR2, FLGD,
           if (restart_from_binary) then
             call w3iors('READ', nds(6), sig(nk), imod, filename=trim(fname))
           else
+#ifdef W3_MPI
             call read_restart(trim(fname), va=va, mapsta=mapsta, mapst2=mapst2)
+#endif 
           end if
         else
           call extcde (60, msg="required restart file " // trim(fname) // " does not exist")
         end if
       else
+#ifdef W3_MPI
         call read_restart('none')
+#endif 
         ! mapst2 is module variable defined in read of mod_def; maptst is from 2.b above
         flcold = .true.
       end if
diff --git a/model/src/w3wavemd.F90 b/model/src/w3wavemd.F90
index c6b5520d6..d73543d34 100644
--- a/model/src/w3wavemd.F90
+++ b/model/src/w3wavemd.F90
@@ -491,8 +491,10 @@ SUBROUTINE W3WAVE ( IMOD, ODAT, TEND, STAMP, NO_OUT &
 #ifdef W3_TIMINGS
     USE W3PARALL, only : PRINT_MY_TIME
 #endif
+#ifdef W3_MPI
     use wav_restart_mod , only : write_restart
     use wav_history_mod , only : write_history
+#endif 
     use w3odatmd        , only : histwr, rstwr, use_historync, use_restartnc, user_restfname
     use w3odatmd        , only : verboselog
     use w3timemd        , only : set_user_timestring
@@ -2355,16 +2357,20 @@ SUBROUTINE W3WAVE ( IMOD, ODAT, TEND, STAMP, NO_OUT &
       !
       !
       if (dsec21(time,tend) == 0.0) then    ! req'd in case waves are running in slow loop
+
         if (use_historync) then
           floutg = .false.
           floutg2 = .false.
+#ifdef W3_MPI
           if (histwr) then
             call w3cprt (imod)
             call w3outg (va, flpfld, .true., .false. )
             call write_history(tend)
           end if
+#endif
         end if
 
+#ifdef W3_MPI
         if (use_restartnc) then
           if (rstwr) then
             call set_user_timestring(tend,user_timestring)
@@ -2373,6 +2379,8 @@ SUBROUTINE W3WAVE ( IMOD, ODAT, TEND, STAMP, NO_OUT &
           end if
         end if
       end if
+#endif
+      
 
       IF ( TOFRST(1)  .EQ. -1 ) THEN
         DTTST  = 1.
diff --git a/model/src/wav_history_mod.F90 b/model/src/wav_history_mod.F90
index e7a3e71a9..4e3453f1b 100644
--- a/model/src/wav_history_mod.F90
+++ b/model/src/wav_history_mod.F90
@@ -11,11 +11,13 @@ module wav_history_mod
   use w3gdatmd          , only : xgrd, ygrd
   use w3gdatmd          , only : nk, nx, ny, mapsf, mapsta, nsea
   use w3odatmd          , only : undef
+#ifdef W3_MPI
   use w3adatmd          , only : mpi_comm_wave
   use wav_import_export , only : nseal_cpl
   use wav_pio_mod       , only : pio_iotype, pio_ioformat, wav_pio_subsystem
   use wav_pio_mod       , only : handle_err, wav_pio_initdecomp
   use pio
+#endif 
   use netcdf
 
   implicit none
@@ -24,8 +26,10 @@ module wav_history_mod
 
   public :: wav_history_init
   public :: write_history
+#ifdef W3_MPI
   public :: varatts
   public :: outvars
+#endif
 
   ! used/reused in module
   integer             :: isea, jsea, ix, iy, ierr
@@ -38,6 +42,8 @@ module wav_history_mod
   ! output variable for (nx,ny,nz) fields
   real, pointer :: var3d(:,:)
 
+#ifdef W3_MPI
+
   type(file_desc_t) :: pioid
   type(var_desc_t)  :: varid
   type(io_desc_t)   :: iodesc2d    !2d only
@@ -58,6 +64,7 @@ module wav_history_mod
   end type varatts
 
   type(varatts), dimension(:), allocatable :: outvars
+#endif 
 
   !===============================================================================
 contains
@@ -112,6 +119,7 @@ subroutine write_history ( timen )
     integer :: n, xtid, ytid, xeid, ztid, stid, mtid, ptid, ktid, timid, nmode
     integer :: len_s, len_m, len_p, len_k
     logical :: s_axis = .false., m_axis = .false., p_axis = .false., k_axis = .false.
+#ifdef W3_MPI
 
     integer :: lmap(nseal_cpl)
 
@@ -119,6 +127,7 @@ subroutine write_history ( timen )
     ! create the netcdf file
     ! -------------------------------------------------------------
 
+
     ! native WW3 file naming
     if (len_trim(user_histfname) == 0) then
       write(fname,'(a,i8.8,a1,i6.6,a)')trim(fnmpre),timen(1),'.',timen(2),'.out_grd.ww3.nc'
@@ -445,6 +454,7 @@ subroutine write_history ( timen )
     if (k_axis) call pio_freedecomp(pioid, iodesc3dk)
 
     call pio_closefile(pioid)
+#endif
 
   end subroutine write_history
 
@@ -481,6 +491,8 @@ subroutine write_var2d(vname, var, dir, usemask, init0, init2, fldir, global)
     character(len=*), optional, intent(in) :: fldir
     character(len=*), optional, intent(in) :: global
 
+#ifdef W3_MPI
+
     ! local variables
     real, dimension(nseal_cpl) :: varout
     logical                    :: lmask, linit0, linit2, lfldir, lglobal
@@ -556,6 +568,8 @@ subroutine write_var2d(vname, var, dir, usemask, init0, init2, fldir, global)
     call pio_setframe(pioid, varid, int(1,kind=Pio_Offset_Kind))
     call pio_write_darray(pioid, varid, iodesc2d, varout, ierr)
     call handle_err(ierr, 'put variable '//trim(vname))
+    
+#endif
 
   end subroutine write_var2d
 
@@ -574,8 +588,8 @@ end subroutine write_var2d
   !!
   !> author DeniseWorthen@noaa.gov
   !> @date 08-26-2024
+#ifdef W3_MPI
   subroutine write_var3d(iodesc, vname, var, init2, fldir)
-
     type(io_desc_t),            intent(inout) :: iodesc
     character(len=*),           intent(in) :: vname
     real            ,           intent(in) :: var(:,:)
@@ -587,6 +601,7 @@ subroutine write_var3d(iodesc, vname, var, init2, fldir)
     logical                         :: linit2, lfldir
     integer                         :: lb, ub
 
+
     linit2 = .false.
     if (present(init2)) then
       linit2 = (trim(init2) == "true")
@@ -624,6 +639,7 @@ subroutine write_var3d(iodesc, vname, var, init2, fldir)
 
     deallocate(varloc)
   end subroutine write_var3d
+#endif 
 
   !===============================================================================
   !> Scan through all possible fields to determine a list of requested variables
@@ -651,12 +667,16 @@ subroutine wav_history_init(stdout)
 
     ! local variables
     integer, parameter :: maxvars = 25  ! maximum number of variables/group
+#ifdef W3_MPI
     type(varatts), dimension(nogrp,maxvars) :: gridoutdefs
+#endif
 
     character(len=100)      :: inptags(100) = ''
     integer                 :: j,k,n,nout
     character(len= 12)      :: ttag
 
+#ifdef W3_MPI
+
     ! obtain all possible output variable tags and attributes
     call define_fields(gridoutdefs)
 
@@ -731,6 +751,7 @@ subroutine wav_history_init(stdout)
       write(stdout,*)
       call flush (stdout)
     end if
+#endif
 
   end subroutine wav_history_init
 
@@ -739,8 +760,11 @@ end subroutine wav_history_init
   !!
   !> @author Denise.Worthen@noaa.gov
   !> @date 09-19-2022
+#ifdef W3_MPI
+
   subroutine define_fields (gridoutdefs)
 
+
     type(varatts), dimension(:,:), intent(inout) :: gridoutdefs
 
     gridoutdefs(:,:)%tag = ""
@@ -911,4 +935,5 @@ subroutine define_fields (gridoutdefs)
          varatts( "U2   ", "U2        ", "User defined 2                                  ", "nd        ", "  ", .false.)  &
          ]
   end subroutine define_fields
+#endif
 end module wav_history_mod