diff --git a/releasenotes/notes/remove-unused-nova-helper-methods-3ee84f57eaab458d.yaml b/releasenotes/notes/remove-unused-nova-helper-methods-3ee84f57eaab458d.yaml
new file mode 100644
index 000000000..faca5d5bb
--- /dev/null
+++ b/releasenotes/notes/remove-unused-nova-helper-methods-3ee84f57eaab458d.yaml
@@ -0,0 +1,15 @@
+---
+upgrade:
+  - |
+    Three unused methods have been removed from the ``NovaHelper`` class in
+    ``watcher.common.nova_helper``:
+
+    * ``get_aggregate_detail``
+    * ``wait_for_volume_status``
+    * ``_check_nova_api_version``
+
+    These methods were only used in unit tests and provided no value to the
+    production codebase. If you have custom code or plugins that depend on
+    these methods, you will need to implement equivalent functionality
+    directly. The methods were not part of the stable public API and their
+    removal should not affect normal Watcher operations.
diff --git a/watcher/common/nova_helper.py b/watcher/common/nova_helper.py
index ed1dbb3ef..a97e8da83 100644
--- a/watcher/common/nova_helper.py
+++ b/watcher/common/nova_helper.py
@@ -613,17 +613,6 @@ class NovaHelper:
         aggregates = self.connection.compute.aggregates()
         return [Aggregate.from_openstacksdk(a) for a in aggregates]
 
-    @nova_retries
-    @handle_nova_error("Aggregate")
-    def get_aggregate_detail(self, aggregate_id):
-        """Get details of a specific host aggregate.
-
-        :param aggregate_id: the ID of the aggregate to get
-        :returns: Aggregate wrapper object if found, None if not found
-        """
-        return Aggregate.from_openstacksdk(
-            self.connection.compute.get_aggregate(aggregate_id))
-
     @nova_retries
     @handle_nova_error("Service")
     def get_service_list(self):
@@ -761,28 +750,6 @@ class NovaHelper:
                       "instance %s", instance_id)
             return False
 
-    def wait_for_volume_status(self, volume, status, timeout=60,
-                               poll_interval=1):
-        """Wait until volume reaches given status.
-
-        :param volume: volume resource
-        :param status: expected status of volume
-        :param timeout: timeout in seconds
-        :param poll_interval: poll interval in seconds
-        """
-        start_time = time.time()
-        while time.time() - start_time < timeout:
-            volume = self.cinder.volumes.get(volume.id)
-            if volume.status == status:
-                break
-            time.sleep(poll_interval)
-        else:
-            raise exception.VolumeNotReachedStatus(
-                volume.id,
-                status
-            )
-        return volume.status == status
-
     def watcher_non_live_migrate_instance(self, instance_id, dest_hostname,
                                           retry=None, interval=None):
         """This method migrates a given instance
diff --git a/watcher/tests/unit/common/test_nova_helper.py b/watcher/tests/unit/common/test_nova_helper.py
index 314488d05..bbdba4f2e 100644
--- a/watcher/tests/unit/common/test_nova_helper.py
+++ b/watcher/tests/unit/common/test_nova_helper.py
@@ -23,7 +23,6 @@ from unittest import mock
 from keystoneauth1 import exceptions as ksa_exc
 from openstack import exceptions as sdk_exc
 
-
 from watcher.common import clients
 from watcher.common import exception
 from watcher.common import nova_helper
@@ -1018,30 +1017,6 @@ class TestNovaHelper(test_utils.NovaResourcesMixin, base.TestCase):
         volume.availability_zone = kwargs.get('availability_zone', 'nova')
         return volume
 
-    def test_wait_for_volume_status(self, mock_cinder):
-        nova_util = nova_helper.NovaHelper()
-
-        # verify that the method will return True when the status of volume
-        # is in the expected status.
-        fake_volume_1 = self.fake_volume(status='in-use')
-        nova_util.cinder.volumes.get.return_value = fake_volume_1
-        result = nova_util.wait_for_volume_status(
-            fake_volume_1,
-            "in-use",
-            timeout=2)
-        self.assertTrue(result)
-
-        # verify that the method will raise Exception when the status of
-        # volume is not in the expected status.
-        fake_volume_2 = self.fake_volume(status='fake-use')
-        nova_util.cinder.volumes.get.return_value = fake_volume_2
-        self.assertRaises(
-            Exception,
-            nova_util.wait_for_volume_status,
-            fake_volume_1,
-            "in-use",
-            timeout=2)
-
     @mock.patch.object(
         nova_helper.NovaHelper, '_instance_confirm_resize', autospec=True
     )
diff --git a/watcher/tests/unit/decision_engine/scope/test_compute.py b/watcher/tests/unit/decision_engine/scope/test_compute.py
index a7bd0383e..bdd909bda 100644
--- a/watcher/tests/unit/decision_engine/scope/test_compute.py
+++ b/watcher/tests/unit/decision_engine/scope/test_compute.py
@@ -290,10 +290,9 @@ class TestComputeScope(base.TestCase):
                 'd010ef1f-dc19-4982-9383-087498bfde03'
             ).watcher_exclude)
 
-    @mock.patch.object(nova_helper.NovaHelper, 'get_aggregate_detail')
     @mock.patch.object(nova_helper.NovaHelper, 'get_aggregate_list')
     def test_get_scoped_model_with_hostaggregate_null(
-            self, mock_list, mock_detail):
+            self, mock_list):
         cluster = self.fake_cluster.generate_scenario_1()
         audit_scope = fake_scopes.fake_scope_3
         mock_list.return_value = [mock.Mock(id=i,