Index: Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.IO/Model/SerializableAssessmentSection.cs
===================================================================
diff -u -ra30b67748bed77736f62b6b3c30c82649bb9cf4e -rf567b2b8e99d56ee71cdb33116f85c0c918cc59e
--- Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.IO/Model/SerializableAssessmentSection.cs	(.../SerializableAssessmentSection.cs)	(revision a30b67748bed77736f62b6b3c30c82649bb9cf4e)
+++ Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.IO/Model/SerializableAssessmentSection.cs	(.../SerializableAssessmentSection.cs)	(revision f567b2b8e99d56ee71cdb33116f85c0c918cc59e)
@@ -24,6 +24,7 @@
 using System.Xml.Serialization;
 using Core.Common.Base.Geometry;
 using Ringtoets.AssemblyTool.IO.Model.DataTypes;
+using Ringtoets.AssemblyTool.IO.Model.Helpers;
 using Ringtoets.AssemblyTool.IO.Properties;
 
 namespace Ringtoets.AssemblyTool.IO.Model
@@ -48,20 +49,19 @@
         /// <param name="id">The unique ID of the assessment section.</param>
         /// <param name="name">The name of the assessment section.</param>
         /// <param name="geometry">The geometry of the reference line.</param>
+        /// <exception cref="ArgumentNullException">Thrown when any parameter is <c>null</c>.</exception>
         /// <exception cref="ArgumentException">Thrown when:
-        /// <list type="bullet">
-        /// <item><paramref name="geometry"/> contains no elements;</item>
-        /// <item><paramref name="id"/> is <c>null</c> or empty.</item>
-        /// </list>
-        /// </exception>
-        /// <exception cref="ArgumentNullException">Thrown when <paramref name="name"/> or <paramref name="geometry"/> is <c>null</c>.</exception>
+        ///<list type="bullet">
+        /// <item><paramref name="geometry"/> contains no elements.</item>
+        /// <item><paramref name="id"/> is invalid.</item>
+        /// </list></exception>
         public SerializableAssessmentSection(string id,
                                              string name,
                                              IEnumerable<Point2D> geometry) : this()
         {
-            if (string.IsNullOrEmpty(id))
+            if (!IdValidator.Validate(id))
             {
-                throw new ArgumentException($@"'{nameof(id)}' must have a value.");
+                throw new ArgumentException($@"'{nameof(id)}' must have a value and consist only of alphanumerical characters, '-', '_' or '.'.");
             }
 
             if (name == null)
Index: Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/SerializableAssessmentSectionTest.cs
===================================================================
diff -u -ra30b67748bed77736f62b6b3c30c82649bb9cf4e -rf567b2b8e99d56ee71cdb33116f85c0c918cc59e
--- Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/SerializableAssessmentSectionTest.cs	(.../SerializableAssessmentSectionTest.cs)	(revision a30b67748bed77736f62b6b3c30c82649bb9cf4e)
+++ Ringtoets/AssemblyTool/test/Ringtoets.AssemblyTool.IO.Test/Model/SerializableAssessmentSectionTest.cs	(.../SerializableAssessmentSectionTest.cs)	(revision f567b2b8e99d56ee71cdb33116f85c0c918cc59e)
@@ -62,17 +62,34 @@
         }
 
         [Test]
-        [TestCase(null)]
+        public void Constructor_IdNull_ThrowsArgumentNullException()
+        {
+            // Call
+            TestDelegate call = () => new SerializableAssessmentSection(null,
+                                                                        "name",
+                                                                        Enumerable.Empty<Point2D>());
+
+            // Assert
+            var exception = Assert.Throws<ArgumentNullException>(call);
+            Assert.AreEqual("id", exception.ParamName);
+        }
+
+        [Test]
+        [TestCase(" ")]
         [TestCase("")]
-        public void Constructor_IdInvalid_ThrowsArgumentException(string id)
+        [TestCase(" InvalidId")]
+        public void Constructor_InvalidId_ThrowsArgumentNullException(string invalidId)
         {
+            // Setup
+            var random = new Random(39);
+
             // Call
-            TestDelegate call = () => new SerializableAssessmentSection(id,
-                                                                        string.Empty,
+            TestDelegate call = () => new SerializableAssessmentSection(invalidId,
+                                                                        "name",
                                                                         Enumerable.Empty<Point2D>());
 
             // Assert
-            const string expectedMessage = "'id' must have a value.";
+            const string expectedMessage = "'id' must have a value and consist only of alphanumerical characters, '-', '_' or '.'.";
             TestHelper.AssertThrowsArgumentExceptionAndTestMessage<ArgumentException>(call, expectedMessage);
         }
 
@@ -107,7 +124,7 @@
         {
             // Setup
             const string name = "section name";
-            const string id = "section id";
+            const string id = "sectionId";
 
             var random = new Random(39);
             var geometry = new[]