diff --git a/homeassistant/components/pegel_online/__init__.py b/homeassistant/components/pegel_online/__init__.py
index 1c71603e41e..c8388f40704 100644
--- a/homeassistant/components/pegel_online/__init__.py
+++ b/homeassistant/components/pegel_online/__init__.py
@@ -12,7 +12,7 @@ from homeassistant.core import HomeAssistant
 from homeassistant.exceptions import ConfigEntryNotReady
 from homeassistant.helpers.aiohttp_client import async_get_clientsession
 
-from .const import CONF_STATION
+from .const import CONF_STATION, DOMAIN
 from .coordinator import PegelOnlineConfigEntry, PegelOnlineDataUpdateCoordinator
 
 _LOGGER = logging.getLogger(__name__)
@@ -30,7 +30,11 @@ async def async_setup_entry(hass: HomeAssistant, entry: PegelOnlineConfigEntry)
     try:
         station = await api.async_get_station_details(station_uuid)
     except CONNECT_ERRORS as err:
-        raise ConfigEntryNotReady("Failed to connect") from err
+        raise ConfigEntryNotReady(
+            translation_domain=DOMAIN,
+            translation_key="communication_error",
+            translation_placeholders={"error": str(err)},
+        ) from err
 
     coordinator = PegelOnlineDataUpdateCoordinator(hass, entry, api, station)
 
diff --git a/homeassistant/components/pegel_online/manifest.json b/homeassistant/components/pegel_online/manifest.json
index 0a0f31532b1..c488eca34af 100644
--- a/homeassistant/components/pegel_online/manifest.json
+++ b/homeassistant/components/pegel_online/manifest.json
@@ -7,5 +7,6 @@
   "integration_type": "service",
   "iot_class": "cloud_polling",
   "loggers": ["aiopegelonline"],
+  "quality_scale": "platinum",
   "requirements": ["aiopegelonline==0.1.1"]
 }
diff --git a/homeassistant/components/pegel_online/quality_scale.yaml b/homeassistant/components/pegel_online/quality_scale.yaml
new file mode 100644
index 00000000000..aa0a153ee9c
--- /dev/null
+++ b/homeassistant/components/pegel_online/quality_scale.yaml
@@ -0,0 +1,87 @@
+rules:
+  # Bronze
+  action-setup:
+    status: exempt
+    comment: no actions/services are implemented
+  appropriate-polling: done
+  brands: done
+  common-modules: done
+  config-flow-test-coverage: done
+  config-flow: done
+  dependency-transparency: done
+  docs-actions:
+    status: exempt
+    comment: no actions/services are implemented
+  docs-high-level-description: done
+  docs-installation-instructions: done
+  docs-removal-instructions: done
+  entity-event-setup: done
+  entity-unique-id: done
+  has-entity-name: done
+  runtime-data: done
+  test-before-configure: done
+  test-before-setup: done
+  unique-config-entry: done
+
+  # Silver
+  action-exceptions:
+    status: exempt
+    comment: no actions/services are implemented
+  config-entry-unloading: done
+  docs-configuration-parameters:
+    status: exempt
+    comment: has no options flow
+  docs-installation-parameters: done
+  entity-unavailable: done
+  integration-owner: done
+  log-when-unavailable: done
+  parallel-updates: done
+  reauthentication-flow:
+    status: exempt
+    comment: no authentication necessary
+  test-coverage: done
+
+  # Gold
+  devices: done
+  diagnostics: done
+  discovery-update-info:
+    status: exempt
+    comment: pure webservice, no discovery
+  discovery:
+    status: exempt
+    comment: pure webservice, no discovery
+  docs-data-update: done
+  docs-examples: done
+  docs-known-limitations: done
+  docs-supported-devices: done
+  docs-supported-functions: done
+  docs-troubleshooting: done
+  docs-use-cases: done
+  dynamic-devices:
+    status: exempt
+    comment: not applicable - see stale-devices
+  entity-category: done
+  entity-device-class: done
+  entity-disabled-by-default: done
+  entity-translations: done
+  exception-translations: done
+  icon-translations: done
+  reconfiguration-flow:
+    status: exempt
+    comment: |
+      each config entry represents only one named measurement station,
+      so when the user wants to add another one, they can just add another config entry
+  repair-issues:
+    status: exempt
+    comment: no known use cases for repair issues or flows, yet
+  stale-devices:
+    status: exempt
+    comment: |
+      does not apply, since only one measurement station per config-entry
+      if a measurement station is removed from the data provider,
+      the user can just remove the related config entry
+
+  # Platinum
+  async-dependency: done
+  inject-websession: done
+  strict-typing: done
diff --git a/homeassistant/components/pegel_online/sensor.py b/homeassistant/components/pegel_online/sensor.py
index ee2e6750911..30d4edfb041 100644
--- a/homeassistant/components/pegel_online/sensor.py
+++ b/homeassistant/components/pegel_online/sensor.py
@@ -20,6 +20,9 @@ from homeassistant.helpers.entity_platform import AddConfigEntryEntitiesCallback
 from .coordinator import PegelOnlineConfigEntry, PegelOnlineDataUpdateCoordinator
 from .entity import PegelOnlineEntity
 
+# Coordinator is used to centralize the data updates
+PARALLEL_UPDATES = 0
+
 
 @dataclass(frozen=True, kw_only=True)
 class PegelOnlineSensorEntityDescription(SensorEntityDescription):
diff --git a/script/hassfest/quality_scale.py b/script/hassfest/quality_scale.py
index 6d4e536744f..b5fd8c3ad7a 100644
--- a/script/hassfest/quality_scale.py
+++ b/script/hassfest/quality_scale.py
@@ -763,7 +763,6 @@ INTEGRATIONS_WITHOUT_QUALITY_SCALE_FILE = [
     "pandora",
     "panel_iframe",
     "peco",
-    "pegel_online",
     "pencom",
     "permobil",
     "persistent_notification",
@@ -1818,7 +1817,6 @@ INTEGRATIONS_WITHOUT_SCALE = [
     "palazzetti",
     "panel_iframe",
     "peco",
-    "pegel_online",
     "pencom",
     "permobil",
     "persistent_notification",