diff --git a/.strict-typing b/.strict-typing
index 6180379f977..ee39824f476 100644
--- a/.strict-typing
+++ b/.strict-typing
@@ -318,6 +318,7 @@ homeassistant.components.steamist.*
 homeassistant.components.stookalert.*
 homeassistant.components.stream.*
 homeassistant.components.streamlabswater.*
+homeassistant.components.suez_water.*
 homeassistant.components.sun.*
 homeassistant.components.surepetcare.*
 homeassistant.components.switch.*
diff --git a/homeassistant/components/suez_water/sensor.py b/homeassistant/components/suez_water/sensor.py
index fc5b804137d..7d7540ed1c0 100644
--- a/homeassistant/components/suez_water/sensor.py
+++ b/homeassistant/components/suez_water/sensor.py
@@ -74,7 +74,7 @@ class SuezSensor(SensorEntity):
         self.client = client
         self._attr_extra_state_attributes = {}
 
-    def _fetch_data(self):
+    def _fetch_data(self) -> None:
         """Fetch latest data from Suez."""
         try:
             self.client.update()
diff --git a/mypy.ini b/mypy.ini
index 2a3a5f0fb0f..6e67167daca 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -2942,6 +2942,16 @@ disallow_untyped_defs = true
 warn_return_any = true
 warn_unreachable = true
 
+[mypy-homeassistant.components.suez_water.*]
+check_untyped_defs = true
+disallow_incomplete_defs = true
+disallow_subclassing_any = true
+disallow_untyped_calls = true
+disallow_untyped_decorators = true
+disallow_untyped_defs = true
+warn_return_any = true
+warn_unreachable = true
+
 [mypy-homeassistant.components.sun.*]
 check_untyped_defs = true
 disallow_incomplete_defs = true