diff --git a/Content.Client/Atmos/Consoles/AtmosMonitoringConsoleNavMapControl.cs b/Content.Client/Atmos/Consoles/AtmosMonitoringConsoleNavMapControl.cs
index 20902722ff..94bfb4b4f3 100644
--- a/Content.Client/Atmos/Consoles/AtmosMonitoringConsoleNavMapControl.cs
+++ b/Content.Client/Atmos/Consoles/AtmosMonitoringConsoleNavMapControl.cs
@@ -162,10 +162,10 @@ public sealed partial class AtmosMonitoringConsoleNavMapControl : NavMapControl
         {
             var list = new List<AtmosMonitoringConsoleLine>();
 
-            foreach (var ((netId, layer, hexColor), atmosPipeData) in chunk.AtmosPipeData)
+            foreach (var ((netId, layer, pipeColor), atmosPipeData) in chunk.AtmosPipeData)
             {
                 // Determine the correct coloration for the pipe
-                var color = Color.FromHex(hexColor) * _basePipeNetColor;
+                var color = pipeColor * _basePipeNetColor;
 
                 if (FocusNetId != null && FocusNetId != netId)
                     color *= _unfocusedPipeNetColor;
diff --git a/Content.Server/Atmos/Consoles/AtmosMonitoringConsoleSystem.cs b/Content.Server/Atmos/Consoles/AtmosMonitoringConsoleSystem.cs
index 3cce1c956e..ebe79c6b5d 100644
--- a/Content.Server/Atmos/Consoles/AtmosMonitoringConsoleSystem.cs
+++ b/Content.Server/Atmos/Consoles/AtmosMonitoringConsoleSystem.cs
@@ -17,6 +17,7 @@ using Robust.Shared.Map.Components;
 using Robust.Shared.Timing;
 using System.Diagnostics.CodeAnalysis;
 using System.Linq;
+using Content.Server.Atmos.EntitySystems;
 using Content.Shared.DeviceNetwork.Components;
 using Content.Shared.NodeContainer;
 
@@ -53,6 +54,7 @@ public sealed class AtmosMonitoringConsoleSystem : SharedAtmosMonitoringConsoleS
 
         // Grid events
         SubscribeLocalEvent<GridSplitEvent>(OnGridSplit);
+        SubscribeLocalEvent<PipeNodeGroupRemovedEvent>(OnPipeNodeGroupRemoved);
     }
 
     #region Event handling
@@ -295,6 +297,25 @@ public sealed class AtmosMonitoringConsoleSystem : SharedAtmosMonitoringConsoleS
 
     #region Pipe net functions
 
+    private void OnPipeNodeGroupRemoved(ref PipeNodeGroupRemovedEvent args)
+    {
+        // When a pipe node group is removed, we need to iterate over all of
+        // our pipe chunks and remove any entries with a matching net id.
+        // (We only need to check the chunks for the affected grid, though.)
+
+        if (!_gridAtmosPipeChunks.TryGetValue(args.Grid, out var chunkData))
+            return;
+
+        foreach (var chunk in chunkData.Values)
+        {
+            foreach (var key in chunk.AtmosPipeData.Keys)
+            {
+                if (key.NetId == args.NetId)
+                    chunk.AtmosPipeData.Remove(key);
+            }
+        }
+    }
+
     private void RebuildAtmosPipeGrid(EntityUid gridUid, MapGridComponent grid)
     {
         var allChunks = new Dictionary<Vector2i, AtmosPipeChunk>();
@@ -411,7 +432,7 @@ public sealed class AtmosMonitoringConsoleSystem : SharedAtmosMonitoringConsoleS
                 continue;
 
             var netId = GetPipeNodeNetId(pipeNode);
-            var subnet = new AtmosMonitoringConsoleSubnet(netId, pipeNode.CurrentPipeLayer, pipeColor.Color.ToHex());
+            var subnet = new AtmosMonitoringConsoleSubnet(netId, pipeNode.CurrentPipeLayer, pipeColor.Color);
             var pipeDirection = pipeNode.CurrentPipeDirection;
 
             chunk.AtmosPipeData.TryGetValue(subnet, out var atmosPipeData);
diff --git a/Content.Server/Atmos/EntitySystems/AtmosphereSystem.API.cs b/Content.Server/Atmos/EntitySystems/AtmosphereSystem.API.cs
index df31db6ba0..67f3a20779 100644
--- a/Content.Server/Atmos/EntitySystems/AtmosphereSystem.API.cs
+++ b/Content.Server/Atmos/EntitySystems/AtmosphereSystem.API.cs
@@ -279,6 +279,14 @@ public partial class AtmosphereSystem
 
     public bool RemovePipeNet(Entity<GridAtmosphereComponent?> grid, PipeNet pipeNet)
     {
+        // Technically this event can be fired even on grids that don't
+        // actually have grid atmospheres.
+        if (pipeNet.Grid is not null)
+        {
+            var ev = new PipeNodeGroupRemovedEvent(grid, pipeNet.NetId);
+            RaiseLocalEvent(ref ev);
+        }
+
         return _atmosQuery.Resolve(grid, ref grid.Comp, false) && grid.Comp.PipeNets.Remove(pipeNet);
     }
 
@@ -329,3 +337,12 @@ public partial class AtmosphereSystem
     [ByRefEvent] private record struct IsHotspotActiveMethodEvent
         (EntityUid Grid, Vector2i Tile, bool Result = false, bool Handled = false);
 }
+
+
+/// <summary>
+/// Raised broadcasted when a pipe node group within a grid has been removed.
+/// </summary>
+/// <param name="Grid">The grid with the removed node group.</param>
+/// <param name="NetId">The net id of the removed node group.</param>
+[ByRefEvent]
+public record struct PipeNodeGroupRemovedEvent(EntityUid Grid, int NetId);
diff --git a/Content.Shared/Atmos/Consoles/Components/AtmosMonitoringConsoleComponent.cs b/Content.Shared/Atmos/Consoles/Components/AtmosMonitoringConsoleComponent.cs
index d01fb4e8bc..022a787ebd 100644
--- a/Content.Shared/Atmos/Consoles/Components/AtmosMonitoringConsoleComponent.cs
+++ b/Content.Shared/Atmos/Consoles/Components/AtmosMonitoringConsoleComponent.cs
@@ -234,9 +234,9 @@ public struct AtmosMonitoringConsoleEntry
 /// </summary>
 /// <param name="NetId">The associated network ID.</param>
 /// <param name="PipeLayer">The associated pipe layer.</param>
-/// <param name="HexCode">The color of the pipe.</param>
+/// <param name="Color">The color of the pipe.</param>
 [Serializable, NetSerializable]
-public record AtmosMonitoringConsoleSubnet(int NetId, AtmosPipeLayer PipeLayer, string HexCode);
+public record AtmosMonitoringConsoleSubnet(int NetId, AtmosPipeLayer PipeLayer, Color Color);
 
 public enum AtmosPipeChunkDataFacing : byte
 {