diff --git a/docs/changes/2769.api.rst b/docs/changes/2769.api.rst
new file mode 100644
index 00000000000..ac4fa24f10c
--- /dev/null
+++ b/docs/changes/2769.api.rst
@@ -0,0 +1,12 @@
+Update definition of the ``ctapipe.containers.EventType`` enum
+to match an updated definition in the CTAO R1 and DL0 data models.
+
+``SKY_PEDESTAL=2`` is changed to the generic ``PEDESTAL``,
+which is expected from most cameras in real data.
+
+New types added are ``SKY_PEDESTAL=5`` and ``RANDOM_MONO=18``.
+
+These types were previously assigned at the subarray event level
+but in fact are per telescope event in the data model.
+A new field ``event_type`` was added to the ``TelescopeTriggerContainer``
+and will be filled by the ``EventSource``-implementations in ctapipe.
diff --git a/src/ctapipe/containers.py b/src/ctapipe/containers.py
index b05cf4133b3..e271da02f49 100644
--- a/src/ctapipe/containers.py
+++ b/src/ctapipe/containers.py
@@ -149,25 +149,40 @@ class CoordinateFrameType(enum.Enum):
 
 
 class EventType(enum.Enum):
-    """Enum of EventTypes as defined in :cite:p:`ctao-r1-event-data-model`"""
+    """R1/DL0 EventType
 
-    # calibrations are 0-15
+    Defined in :cite:p:`ctao-r1-event-data-model`.
+    """
+
+    #: Flatfield event
     FLATFIELD = 0
+    #: Single PE event
     SINGLE_PE = 1
-    SKY_PEDESTAL = 2
+    #: Generic pedestal, assigned if no further distinction on the type could be made
+    PEDESTAL = 2
+    #: Dark pedestal, taken with HV on, shutter closed.
     DARK_PEDESTAL = 3
+    #: Electronics pedestal, taken with HV off.
     ELECTRONIC_PEDESTAL = 4
+    #: Sky pedestal, taken with HV on, shutter open
+    SKY_PEDESTAL = 5
     OTHER_CALIBRATION = 15
 
-    #: For mono-telescope triggers (not used in MC)
+    #: Muon event candidate
     MUON = 16
+    #: (LST) hardware-stereo trigger
     HARDWARE_STEREO = 17
+    #: Random mono trigger, used in simulations to force storage
+    #: of event regardless of subarray trigger for certain studies.
+    RANDOM_MONO = 18
 
     #: ACADA (DAQ) software trigger
     DAQ = 24
 
-    #: Standard Physics  stereo trigger
+    #: Standard Physics trigger
     SUBARRAY = 32
+    #: Standard Physics trigger with extended readout window
+    LONG_EVENT = 33
 
     UNKNOWN = 255
 
@@ -919,6 +934,8 @@ class SimulationConfigContainer(Container):
 class TelescopeTriggerContainer(Container):
     default_prefix = ""
     time = Field(NAN_TIME, description="Telescope trigger time")
+    event_type = Field(EventType.UNKNOWN, description="Event type")
+
     n_trigger_pixels = Field(
         -1, description="Number of trigger groups (sectors) listed"
     )
diff --git a/src/ctapipe/io/simteleventsource.py b/src/ctapipe/io/simteleventsource.py
index b9338253e27..c8a8de7826d 100644
--- a/src/ctapipe/io/simteleventsource.py
+++ b/src/ctapipe/io/simteleventsource.py
@@ -1,7 +1,7 @@
 import enum
 import warnings
 from contextlib import nullcontext
-from enum import Enum, auto, unique
+from enum import Enum, IntFlag, auto, unique
 from gzip import GzipFile
 from io import BufferedReader
 from pathlib import Path
@@ -103,6 +103,37 @@
 _float32_nan = np.float32(np.nan)
 
 
+class SimTelTriggerMask(IntFlag):
+    """sim_telarray trigger type mask (teltrg_type_mask)."""
+
+    ANALOG_MAJORITY = auto()
+    ANALOG_SUM = auto()
+    DIGITAL_SUM = auto()
+    DIGITAL_MAJORITY = auto()
+    RESERVED4 = auto()
+    RESERVED5 = auto()
+    RESERVED6 = auto()
+    RESERVED7 = auto()
+    LONG_EVENT = auto()
+    MUON = auto()
+    RANDOM_MONO = auto()
+
+
+def _trigger_mask_to_event_type(trigger_mask):
+    trigger_mask = SimTelTriggerMask(int(trigger_mask))
+
+    if SimTelTriggerMask.RANDOM_MONO in trigger_mask:
+        return EventType.RANDOM_MONO
+
+    if SimTelTriggerMask.MUON in trigger_mask:
+        return EventType.MUON
+
+    if SimTelTriggerMask.LONG_EVENT in trigger_mask:
+        return EventType.LONG_EVENT
+
+    return EventType.SUBARRAY
+
+
 def _clip_altitude_if_close(altitude):
     """
     Round absolute values slightly larger than pi/2 in float64 to pi/2
@@ -1143,8 +1174,10 @@ def _fill_trigger_info(self, array_event):
         central_time = parse_simtel_time(trigger["gps_time"])
 
         tel = Map(TelescopeTriggerContainer)
-        for tel_id, time in zip(
-            trigger["triggered_telescopes"], trigger["trigger_times"]
+        for tel_id, time, trigger_mask in zip(
+            trigger["triggered_telescopes"],
+            trigger["trigger_times"],
+            trigger["teltrg_type_mask"],
         ):
             if self.allowed_tels and tel_id not in self.allowed_tels:
                 continue
@@ -1171,6 +1204,7 @@ def _fill_trigger_info(self, array_event):
 
             tel[tel_id] = TelescopeTriggerContainer(
                 time=time,
+                event_type=_trigger_mask_to_event_type(trigger_mask),
                 n_trigger_pixels=n_trigger_pixels,
                 trigger_pixels=trigger_pixels,
             )