diff --git a/imgw_pib/__init__.py b/imgw_pib/__init__.py
index d3028cb..5086ec7 100644
--- a/imgw_pib/__init__.py
+++ b/imgw_pib/__init__.py
@@ -213,7 +213,7 @@ def _parse_hydrological_data(self: Self, data: dict[str, Any]) -> HydrologicalDa
         water_level = data[API_WATER_LEVEL]
 
         if water_level is None:
-            msg = "Invalid water level"
+            msg = "Invalid water level value"
             raise ApiError(msg)
 
         water_level_sensor = SensorData(