diff --git a/docs/source/usersguide/geometry.rst b/docs/source/usersguide/geometry.rst
index 4df3681a5..2b6a6fef2 100644
--- a/docs/source/usersguide/geometry.rst
+++ b/docs/source/usersguide/geometry.rst
@@ -443,7 +443,7 @@ entirely by a DAGMC geometry will contain only the DAGMC universe. Using a
 :class:`openmc.DAGMCUniverse` looks like the following::
 
    dag_univ = openmc.DAGMCUniverse(filename='dagmc.h5m')
-   geometry = openmc.Geometry(root=dag_univ)
+   geometry = openmc.Geometry(dag_univ)
    geometry.export_to_xml()
 
 The resulting ``geometry.xml`` file will be:
@@ -475,7 +475,7 @@ Cell, Surface, and Material IDs
 -------------------------------
 
 By default, DAGMC applies cell and surface IDs defined by the CAD engine that
-the model originated in. If these IDs overlap with ID's in the CSG ID space,
+the model originated in. If these IDs overlap with IDs in the CSG ID space,
 this will result in an error. However, the ``auto_ids`` property of a DAGMC
 universe can be set to set DAGMC cell and surface IDs by appending to the
 existing CSG cell ID space in the OpenMC model.
@@ -485,7 +485,7 @@ assignments are based on natively defined OpenMC materials, no further work is
 required. If DAGMC materials are assigned using the `University of Wisconsin
 Unified Workflow`_ (UWUW), however, material IDs in the UWUW material library
 may overlap with those used in the CSG geometry. In this case, overlaps in the
-UWUW and OpenMC material ID space will cause an error. To automatically resolved
+UWUW and OpenMC material ID space will cause an error. To automatically resolve
 these ID overlaps, ``auto_ids`` can be set to ``True`` to append the UWUW
 material IDs to the OpenMC material ID space.
 
diff --git a/include/openmc/cell.h b/include/openmc/cell.h
index ad17b6f78..f04f9f6b7 100644
--- a/include/openmc/cell.h
+++ b/include/openmc/cell.h
@@ -231,7 +231,7 @@ public:
   std::pair<double, int32_t>
   distance(Position r, Direction u, int32_t on_surface, Particle* p) const;
 
-  void to_hdf5_inner(hid_t group_id) const;
+  void to_hdf5_inner(hid_t group_id) const override;
 
   BoundingBox bounding_box() const;
 
diff --git a/include/openmc/dagmc.h b/include/openmc/dagmc.h
index 6e292488a..1369424e7 100644
--- a/include/openmc/dagmc.h
+++ b/include/openmc/dagmc.h
@@ -19,15 +19,14 @@ class UWUW;
 
 namespace openmc {
 
-class DAGSurface : public Surface
-{
+class DAGSurface : public Surface {
 public:
   DAGSurface();
 
-  double evaluate(Position r) const;
-  double distance(Position r, Direction u, bool coincident) const;
-  Direction normal(Position r) const;
-  Direction reflect(Position r, Direction u, Particle* p) const;
+  double evaluate(Position r) const override;
+  double distance(Position r, Direction u, bool coincident) const override;
+  Direction normal(Position r) const override;
+  Direction reflect(Position r, Direction u, Particle* p) const override;
 
   inline void to_hdf5_inner(hid_t group_id) const override {};
 
@@ -39,14 +38,14 @@ class DAGCell : public Cell {
 public:
   DAGCell();
 
-  bool contains(Position r, Direction u, int32_t on_surface) const;
+  bool contains(Position r, Direction u, int32_t on_surface) const override;
 
   std::pair<double, int32_t>
-  distance(Position r, Direction u, int32_t on_surface, Particle* p) const;
+  distance(Position r, Direction u, int32_t on_surface, Particle* p) const override;
 
-  BoundingBox bounding_box() const;
+  BoundingBox bounding_box() const override;
 
-  void to_hdf5_inner(hid_t group_id) const;
+  void to_hdf5_inner(hid_t group_id) const override;
 
   std::shared_ptr<moab::DagMC> dagmc_ptr_; //!< Pointer to DagMC instance
   int32_t dag_index_;      //!< DagMC index of cell
@@ -98,7 +97,7 @@ public:
   //! \return A string of the ID ranges for entities of dimension \p dim
   std::string dagmc_ids_for_dim(int dim) const;
 
-  virtual bool find_cell(Particle &p) const override;
+  bool find_cell(Particle &p) const override;
 
   // Data Members
   std::string filename_; //!< Name of the DAGMC file used to create this universe
diff --git a/openmc/universe.py b/openmc/universe.py
index 8a12d1160..d5d015eba 100644
--- a/openmc/universe.py
+++ b/openmc/universe.py
@@ -677,10 +677,9 @@ class DAGMCUniverse(UniverseBase):
         self.auto_mat_ids = auto_mat_ids
 
     def __repr__(self):
-        fmt_str = '{: <16}=\t{}\n'
         string = super().__repr__()
-        string += fmt_str.format('\tGeom', 'DAGMC')
-        string += fmt_str.format('\tFile', self.filename)
+        string += '{: <16}=\t{}\n'.format('\tGeom', 'DAGMC')
+        string += '{: <16}=\t{}\n'.format('\tFile', self.filename)
         return string
 
     @property
diff --git a/src/particle.cpp b/src/particle.cpp
index 8abe2d9c6..6acd989fa 100644
--- a/src/particle.cpp
+++ b/src/particle.cpp
@@ -386,7 +386,6 @@ Particle::cross_surface()
   if (surf->geom_type_ != GeometryType::DAG) history().reset();
   #endif
 
-
   // Handle any applicable boundary conditions.
   if (surf->bc_ && settings::run_mode != RunMode::PLOTTING) {
     surf->bc_->handle_particle(*this, *surf);
diff --git a/src/surface.cpp b/src/surface.cpp
index 20aadc6e8..1de606198 100644
--- a/src/surface.cpp
+++ b/src/surface.cpp
@@ -204,8 +204,7 @@ Surface::to_hdf5(hid_t group_id) const
 
   if (geom_type_ == GeometryType::DAG) {
     write_string(surf_group, "geom_type", "dagmc", false);
-  }
-  else if (geom_type_ == GeometryType::CSG) {
+  } else if (geom_type_ == GeometryType::CSG) {
     write_string(surf_group, "geom_type", "csg", false);
 
     if (bc_) {
diff --git a/tests/regression_tests/dagmc/legacy/test.py b/tests/regression_tests/dagmc/legacy/test.py
index 76b76fbda..e0fccb934 100644
--- a/tests/regression_tests/dagmc/legacy/test.py
+++ b/tests/regression_tests/dagmc/legacy/test.py
@@ -28,7 +28,7 @@ def model():
 
     # geometry
     dag_univ = openmc.DAGMCUniverse("dagmc.h5m")
-    model.geometry = openmc.Geometry(root=dag_univ)
+    model.geometry = openmc.Geometry(dag_univ)
 
     # tally
     tally = openmc.Tally()
diff --git a/tests/regression_tests/dagmc/refl/test.py b/tests/regression_tests/dagmc/refl/test.py
index 2f4162b16..3fe41345c 100644
--- a/tests/regression_tests/dagmc/refl/test.py
+++ b/tests/regression_tests/dagmc/refl/test.py
@@ -29,7 +29,7 @@ class UWUWTest(PyAPITestHarness):
 
         # geometry
         dag_univ = openmc.DAGMCUniverse("dagmc.h5m", auto_geom_ids=True)
-        model.geometry = openmc.Geometry(root=dag_univ)
+        model.geometry = openmc.Geometry(dag_univ)
 
         # tally
         tally = openmc.Tally()
diff --git a/tests/regression_tests/dagmc/universes/test.py b/tests/regression_tests/dagmc/universes/test.py
index cc407aa5e..1458462c4 100644
--- a/tests/regression_tests/dagmc/universes/test.py
+++ b/tests/regression_tests/dagmc/universes/test.py
@@ -55,7 +55,7 @@ class DAGMCUniverseTest(PyAPITestHarness):
 
         bounding_cell = openmc.Cell(fill=pincell_univ, region=box)
 
-        model.geometry = openmc.Geometry(root=[bounding_cell])
+        model.geometry = openmc.Geometry([bounding_cell])
 
         # settings
         model.settings.particles = 100