Index: src/Deltares.DSoilModel.Forms/DSoilModelPlugin.cs
===================================================================
diff -u -r418 -r420
--- src/Deltares.DSoilModel.Forms/DSoilModelPlugin.cs	(.../DSoilModelPlugin.cs)	(revision 418)
+++ src/Deltares.DSoilModel.Forms/DSoilModelPlugin.cs	(.../DSoilModelPlugin.cs)	(revision 420)
@@ -1097,16 +1097,33 @@
             var soil = o as Soil;
             if (soil != null)
             {
+                // 1D profiles 
                 foreach (var sp1d in project.SoilProfiles1D)
                 {
-                    if (sp1d.Layers.Any(l => l.Soil == o))
+                    if (sp1d.Layers.Any(l => l.Soil == soil))
                     {
                         LogErrorCannotDelete(soil, sp1d);
                         result = false;
                     }
                 }
-            }
 
+                // 2D profiles 
+                foreach (var sp2d in project.SoilProfiles2D)
+                {
+                    if (sp2d.Surfaces.Any(s => s.Soil == soil))
+                    {
+                        LogErrorCannotDelete(soil, sp2d);
+                        result = false;
+                    }
+                }
+
+                // soil in the segments
+                foreach (var sgm in project.SoilSegments.Where(sgm => sgm.DefaultFillMaterialName == soil)) 
+                {
+                    LogErrorCannotDelete(soil, sgm);
+                    result = false;
+                }
+            }
             return result;
         }
 
Index: src/Deltares.DSoilModel.Forms.Tests/DSoilModelPluginTests.cs
===================================================================
diff -u -r413 -r420
--- src/Deltares.DSoilModel.Forms.Tests/DSoilModelPluginTests.cs	(.../DSoilModelPluginTests.cs)	(revision 413)
+++ src/Deltares.DSoilModel.Forms.Tests/DSoilModelPluginTests.cs	(.../DSoilModelPluginTests.cs)	(revision 420)
@@ -1,4 +1,5 @@
 using System.Linq;
+using System.Reflection;
 using System.Threading;
 using Deltares.DSoilModel.Data;
 using Deltares.Geometry.Forms;
@@ -7,7 +8,7 @@
 using Deltares.Standard.Forms;
 using Deltares.Standard.Forms.DExpress;
 using System.Windows.Forms;
-
+using Deltares.Geotechnics;
 using NUnit.Framework;
 
 namespace Deltares.DSoilModel.Forms.Tests
@@ -91,5 +92,68 @@
             
             return p.Project;
         }
+
+        private bool CanDelete(DSoilModelPlugin p, object obj)
+        {
+            return (bool) p.GetType().GetMethod("CanDelete", BindingFlags.NonPublic | BindingFlags.Instance).Invoke(p, new[] {obj});
+        }
+
+        [Test]
+        public void CanDeleteTest_SoilInSoilProfiles1D()
+        {
+            var p = new DSoilModelProject();
+            plugin.Project = p;
+            
+            var soilUsed = new Soil();
+            var soilUnused = new Soil();
+            p.Soils.Add(soilUnused);
+            p.Soils.Add(soilUsed);
+
+            var sp1 = new SoilProfile1D(0, -1, soilUsed);
+            var sp2 = new SoilProfile1D(0, -1, soilUsed);
+            p.SoilProfiles1D.Add(sp1);
+            p.SoilProfiles1D.Add(sp2);
+
+            Assert.IsTrue(CanDelete(plugin, soilUnused));
+            Assert.IsFalse(CanDelete(plugin, soilUsed));
+        }
+        
+        [Test]
+        public void CanDeleteTest_SoilInSoilProfiles2D()
+        {
+            var p = new DSoilModelProject();
+            plugin.Project = p;
+            
+            var soilUsed = new Soil();
+            var soilUnused = new Soil();
+            p.Soils.Add(soilUnused);
+            p.Soils.Add(soilUsed);
+
+            var sp = new SoilProfile2D {Surfaces = { new SoilLayer2D(), new SoilLayer2D {Soil = soilUsed}}};
+            p.SoilProfiles2D.Add(sp);
+
+            Assert.IsTrue(CanDelete(plugin, soilUnused));
+            Assert.IsFalse(CanDelete(plugin, soilUsed));
+        }
+        
+        [Test]
+        public void CanDeleteTest_SoilInSegments()
+        {
+            var p = new DSoilModelProject();
+            plugin.Project = p;
+            
+            var soilUsed = new Soil();
+            var soilUnused = new Soil();
+            p.Soils.Add(soilUnused);
+            p.Soils.Add(soilUsed);
+
+            var seg1 = new SoilSegment {DefaultFillMaterialName = soilUsed};
+            var seg2 = new SoilSegment();
+            p.SoilSegments.Add(seg1);
+            p.SoilSegments.Add(seg2);
+
+            Assert.IsTrue(CanDelete(plugin, soilUnused));
+            Assert.IsFalse(CanDelete(plugin, soilUsed));
+        }
     }
 }