diff --git a/src/config.yaml b/src/config.yaml
index 4000a6b..5aee829 100644
--- a/src/config.yaml
+++ b/src/config.yaml
@@ -1,4 +1,10 @@
 options:
+  backend-availability-zone:
+    default:
+    type: string
+    description: |
+      Availability zone name of this volume backend. If set, it will
+      override the default availability zone.
   driver-source:
     type: string
     default:
diff --git a/src/lib/charm/openstack/cinder_purestorage.py b/src/lib/charm/openstack/cinder_purestorage.py
index b5518d6..25b9ec5 100644
--- a/src/lib/charm/openstack/cinder_purestorage.py
+++ b/src/lib/charm/openstack/cinder_purestorage.py
@@ -42,6 +42,11 @@ class CinderpurestorageCharm(
             ('volume_backend_name', service),
             ('allowed_direct_url_schemes', 'cinder')]
 
+        backend_az = self.config.get('backend-availability-zone')
+        if backend_az:
+            driver_options.append(
+                ('backend_availability_zone', backend_az))
+
         if self.config.get('protocol') == 'nvme-roce':
             if self.config.get('nvme-cidr'):
                 nvme_roce.extend([('pure_nvme_cidr',