diff --git a/homeassistant/components/hikvision/binary_sensor.py b/homeassistant/components/hikvision/binary_sensor.py
index 9e1cb97f7783..c4455e7461c5 100644
--- a/homeassistant/components/hikvision/binary_sensor.py
+++ b/homeassistant/components/hikvision/binary_sensor.py
@@ -314,6 +314,12 @@ class HikvisionBinarySensor(HikvisionEntity, BinarySensorEntity):
         """Get sensor attributes from camera."""
         return self._camera.fetch_attributes(self._sensor_type, self._channel)
 
+    @property
+    @override
+    def available(self) -> bool:
+        """Return true if the device's event stream is connected."""
+        return self._camera.stream_connected
+
     @property
     @override
     def is_on(self) -> bool:
diff --git a/tests/components/hikvision/conftest.py b/tests/components/hikvision/conftest.py
index da827a707793..b0c090451106 100644
--- a/tests/components/hikvision/conftest.py
+++ b/tests/components/hikvision/conftest.py
@@ -123,6 +123,7 @@ def mock_hikcamera(mock_hik_get_channels: MagicMock) -> Generator[MagicMock]:
             "2024-01-01T00:00:00Z",
         )
         camera.get_event_triggers.return_value = {}
+        camera.stream_connected = True
 
         # pyHik 0.4.0 methods
         camera.get_channels.return_value = [1]
diff --git a/tests/components/hikvision/test_binary_sensor.py b/tests/components/hikvision/test_binary_sensor.py
index 5cc742971e1c..74b9cf19a22e 100644
--- a/tests/components/hikvision/test_binary_sensor.py
+++ b/tests/components/hikvision/test_binary_sensor.py
@@ -19,6 +19,7 @@ from homeassistant.const import (
     CONF_SSL,
     CONF_USERNAME,
     STATE_OFF,
+    STATE_UNAVAILABLE,
     Platform,
 )
 from homeassistant.core import DOMAIN as HOMEASSISTANT_DOMAIN, HomeAssistant
@@ -394,3 +395,27 @@ async def test_binary_sensor_update_callback(
     state = hass.states.get("binary_sensor.front_camera_motion")
     assert state is not None
     assert state.state == "on"
+
+
+async def test_binary_sensor_unavailable_when_stream_disconnected(
+    hass: HomeAssistant,
+    mock_config_entry: MockConfigEntry,
+    mock_hikcamera: MagicMock,
+) -> None:
+    """Test sensors go unavailable when the event stream disconnects."""
+    camera = mock_hikcamera.return_value
+    await setup_integration(hass, mock_config_entry)
+
+    state = hass.states.get("binary_sensor.front_camera_motion")
+    assert state is not None
+    assert state.state == STATE_OFF
+
+    # pyhik notifies every registered callback when the stream drops
+    camera.stream_connected = False
+    callback_func = camera.add_update_callback.call_args_list[0][0][0]
+    callback_func("stream disconnected")
+    await hass.async_block_till_done()
+
+    state = hass.states.get("binary_sensor.front_camera_motion")
+    assert state is not None
+    assert state.state == STATE_UNAVAILABLE