diff --git a/api/src/opentrons/protocol_engine/state/state_summary.py b/api/src/opentrons/protocol_engine/state/state_summary.py
index 91ddcd40c62..96d6683edf8 100644
--- a/api/src/opentrons/protocol_engine/state/state_summary.py
+++ b/api/src/opentrons/protocol_engine/state/state_summary.py
@@ -6,12 +6,12 @@
 from ..errors import ErrorOccurrence
 from ..types import (
     EngineStatus,
+    LiquidHeightSummary,
     LoadedLabware,
     LabwareOffset,
     LoadedModule,
     LoadedPipette,
     Liquid,
-    LiquidHeightInfo,
 )
 
 
@@ -29,4 +29,4 @@ class StateSummary(BaseModel):
     startedAt: Optional[datetime]
     completedAt: Optional[datetime]
     liquids: List[Liquid] = Field(default_factory=list)
-    wells: List[LiquidHeightInfo] = Field(default_factory=list)
+    wells: List[LiquidHeightSummary] = Field(default_factory=list)
diff --git a/api/src/opentrons/protocol_engine/state/wells.py b/api/src/opentrons/protocol_engine/state/wells.py
index 6aa06cd4703..e50a23fdcf2 100644
--- a/api/src/opentrons/protocol_engine/state/wells.py
+++ b/api/src/opentrons/protocol_engine/state/wells.py
@@ -8,7 +8,7 @@
 )
 from opentrons.protocol_engine.commands.liquid_probe import LiquidProbeResult
 from opentrons.protocol_engine.commands.pipetting_common import LiquidNotFoundError
-from opentrons.protocol_engine.types import LiquidHeightInfo
+from opentrons.protocol_engine.types import LiquidHeightInfo, LiquidHeightSummary
 
 from .abstract_store import HasState, HandlesActions
 from ..actions import Action
@@ -19,7 +19,6 @@
 class WellState:
     """State of all wells."""
 
-    #                       Dict[Labware: Dict[Wellname: [Height,TimeRecorded]]]
     measured_liquid_heights: Dict[str, Dict[str, LiquidHeightInfo]]
 
 
@@ -82,16 +81,36 @@ def __init__(self, state: WellState) -> None:
         """
         self._state = state
 
-    def get_all(self) -> List[LiquidHeightInfo]:
+    def get_all(self) -> List[LiquidHeightSummary]:
         """Get all well liquid heights."""
-        allHeights = []  # type: List[LiquidHeightInfo]
-        for val in self._state.measured_liquid_heights.values():
-            allHeights.extend(a for a in val.values())
+        allHeights = []  # type: List[LiquidHeightSummary]
+        # for key,  in self._state.measured_liquid_heights.items():
+        #     lhs = LiquidHeightSummary(labware_id=)
+        #     allHeights.extend(a for a in val.values())
+        # return allHeights
+        for labware in self._state.measured_liquid_heights.keys():
+            for well, lhi in self._state.measured_liquid_heights[labware].items():
+                lhs = LiquidHeightSummary(
+                    labware_id=labware,
+                    well_name=well,
+                    height=lhi.height,
+                    last_measured=lhi.last_measured,
+                )
+            allHeights.append(lhs)
         return allHeights
 
-    def get_all_in_labware(self, labware_id: str) -> List[LiquidHeightInfo]:
+    def get_all_in_labware(self, labware_id: str) -> List[LiquidHeightSummary]:
         """Get all well liquid heights for a particular labware."""
-        return list(self._state.measured_liquid_heights[labware_id].values())
+        allHeights = []  # type: List[LiquidHeightSummary]
+        for well, lhi in self._state.measured_liquid_heights[labware_id].items():
+            lhs = LiquidHeightSummary(
+                labware_id=labware_id,
+                well_name=well,
+                height=lhi.height,
+                last_measured=lhi.last_measured,
+            )
+            allHeights.append(lhs)
+        return allHeights
 
     def get_last_measured_liquid_height(
         self, labware_id: str, well_name: str
diff --git a/api/src/opentrons/protocol_engine/types.py b/api/src/opentrons/protocol_engine/types.py
index 504fa7cc2bb..a94c24a9923 100644
--- a/api/src/opentrons/protocol_engine/types.py
+++ b/api/src/opentrons/protocol_engine/types.py
@@ -307,6 +307,15 @@ class LiquidHeightInfo(BaseModel):
     last_measured: datetime
 
 
+class LiquidHeightSummary(BaseModel):
+    """Payload for liquid state height in StateSummary."""
+
+    labware_id: str
+    well_name: str
+    height: float
+    last_measured: datetime
+
+
 @dataclass(frozen=True)
 class CurrentAddressableArea:
     """The latest addressable area the robot has accessed."""