diff --git a/homeassistant/components/streamlabswater/coordinator.py b/homeassistant/components/streamlabswater/coordinator.py
index dc57ae78810..bcb2e7790d4 100644
--- a/homeassistant/components/streamlabswater/coordinator.py
+++ b/homeassistant/components/streamlabswater/coordinator.py
@@ -50,8 +50,8 @@ class StreamlabsCoordinator(DataUpdateCoordinator[dict[str, StreamlabsData]]):
             res[location_id] = StreamlabsData(
                 is_away=location["homeAway"] == "away",
                 name=location["name"],
-                daily_usage=round(water_usage["today"], 1),
-                monthly_usage=round(water_usage["thisMonth"], 1),
-                yearly_usage=round(water_usage["thisYear"], 1),
+                daily_usage=water_usage["today"],
+                monthly_usage=water_usage["thisMonth"],
+                yearly_usage=water_usage["thisYear"],
             )
         return res
diff --git a/homeassistant/components/streamlabswater/sensor.py b/homeassistant/components/streamlabswater/sensor.py
index e49668208af..9faf3defa89 100644
--- a/homeassistant/components/streamlabswater/sensor.py
+++ b/homeassistant/components/streamlabswater/sensor.py
@@ -35,6 +35,7 @@ SENSORS: tuple[StreamlabsWaterSensorEntityDescription, ...] = (
         translation_key="daily_usage",
         native_unit_of_measurement=UnitOfVolume.GALLONS,
         device_class=SensorDeviceClass.WATER,
+        suggested_display_precision=1,
         value_fn=lambda data: data.daily_usage,
     ),
     StreamlabsWaterSensorEntityDescription(
@@ -42,6 +43,7 @@ SENSORS: tuple[StreamlabsWaterSensorEntityDescription, ...] = (
         translation_key="monthly_usage",
         native_unit_of_measurement=UnitOfVolume.GALLONS,
         device_class=SensorDeviceClass.WATER,
+        suggested_display_precision=1,
         value_fn=lambda data: data.monthly_usage,
     ),
     StreamlabsWaterSensorEntityDescription(
@@ -49,6 +51,7 @@ SENSORS: tuple[StreamlabsWaterSensorEntityDescription, ...] = (
         translation_key="yearly_usage",
         native_unit_of_measurement=UnitOfVolume.GALLONS,
         device_class=SensorDeviceClass.WATER,
+        suggested_display_precision=1,
         value_fn=lambda data: data.yearly_usage,
     ),
 )
diff --git a/tests/components/streamlabswater/snapshots/test_sensor.ambr b/tests/components/streamlabswater/snapshots/test_sensor.ambr
index 5cd2479903a..9d8ca3a99e6 100644
--- a/tests/components/streamlabswater/snapshots/test_sensor.ambr
+++ b/tests/components/streamlabswater/snapshots/test_sensor.ambr
@@ -18,6 +18,9 @@
     'id': <ANY>,
     'name': None,
     'options': dict({
+      'sensor': dict({
+        'suggested_display_precision': 1,
+      }),
     }),
     'original_device_class': <SensorDeviceClass.WATER: 'water'>,
     'original_icon': None,
@@ -41,7 +44,7 @@
     'entity_id': 'sensor.water_monitor_daily_usage',
     'last_changed': <ANY>,
     'last_updated': <ANY>,
-    'state': '200.4',
+    'state': '200.44691536',
   })
 # ---
 # name: test_all_entities[sensor.water_monitor_monthly_usage-entry]
@@ -63,6 +66,9 @@
     'id': <ANY>,
     'name': None,
     'options': dict({
+      'sensor': dict({
+        'suggested_display_precision': 1,
+      }),
     }),
     'original_device_class': <SensorDeviceClass.WATER: 'water'>,
     'original_icon': None,
@@ -86,7 +92,7 @@
     'entity_id': 'sensor.water_monitor_monthly_usage',
     'last_changed': <ANY>,
     'last_updated': <ANY>,
-    'state': '420.5',
+    'state': '420.514099294',
   })
 # ---
 # name: test_all_entities[sensor.water_monitor_yearly_usage-entry]
@@ -108,6 +114,9 @@
     'id': <ANY>,
     'name': None,
     'options': dict({
+      'sensor': dict({
+        'suggested_display_precision': 1,
+      }),
     }),
     'original_device_class': <SensorDeviceClass.WATER: 'water'>,
     'original_icon': None,
@@ -131,6 +140,6 @@
     'entity_id': 'sensor.water_monitor_yearly_usage',
     'last_changed': <ANY>,
     'last_updated': <ANY>,
-    'state': '65432.4',
+    'state': '65432.389256934',
   })
 # ---