diff --git a/optimade/models/structures.py b/optimade/models/structures.py
index bdedd24e8..c9d724e0d 100644
--- a/optimade/models/structures.py
+++ b/optimade/models/structures.py
@@ -1104,13 +1104,6 @@ def validate_structure_features(self) -> "StructureResourceAttributes":
                             "greater than one element"
                         )
                     break
-            else:
-                if StructureFeatures.DISORDER in self.structure_features:
-                    raise ValueError(
-                        f"{StructureFeatures.DISORDER.value} MUST NOT be present, "
-                        "since all species' chemical_symbols lists are equal to or "
-                        "less than one element"
-                    )
 
             # site_attachments
             for species in self.species:
diff --git a/tests/models/test_data/test_bad_structures.json b/tests/models/test_data/test_bad_structures.json
index da4688014..95f67c1f0 100644
--- a/tests/models/test_data/test_bad_structures.json
+++ b/tests/models/test_data/test_bad_structures.json
@@ -832,180 +832,6 @@
     "structure_features": [],
     "task_id": "mpf_220"
   },
-  {
-    "_id": {
-      "$oid": "5cfb441f053b174410700e04"
-    },
-    "chemsys": "Ag-C-Cl-N-O-S",
-    "cartesian_site_positions": [
-      [
-        0.48493191553525494,
-        0.48493191553525494,
-        0.48493191553525494
-      ],
-      [
-        0.48493191553525494,
-        0.48493191553525494,
-        0.48493191553525494
-      ],
-      [
-        0.48493191553525494,
-        0.48493191553525494,
-        0.48493191553525494
-      ],
-      [
-        0.48493191553525494,
-        0.48493191553525494,
-        0.48493191553525494
-      ],
-      [
-        0.48493191553525494,
-        0.48493191553525494,
-        0.48493191553525494
-      ],
-      [
-        0.48493191553525494,
-        0.48493191553525494,
-        0.48493191553525494
-      ],
-      [
-        0.48493191553525494,
-        0.48493191553525494,
-        0.48493191553525494
-      ],
-      [
-        0.48493191553525494,
-        0.48493191553525494,
-        0.48493191553525494
-      ],
-      [
-        0.48493191553525494,
-        0.48493191553525494,
-        0.48493191553525494
-      ],
-      [
-        0.48493191553525494,
-        0.48493191553525494,
-        0.48493191553525494
-      ]
-    ],
-    "dimension_types": [
-      1,
-      1,
-      1
-    ],
-    "nperiodic_dimensions": 3,
-    "elements": [
-      "Ag",
-      "C",
-      "Cl",
-      "N",
-      "O",
-      "S"
-    ],
-    "elements_ratios": [
-      0.2,
-      0.1,
-      0.1,
-      0.1,
-      0.4,
-      0.1
-    ],
-    "formula_anonymous": "A4B2CDEF",
-    "last_modified": {
-      "$date": "2019-06-08T05:13:37.377Z"
-    },
-    "lattice_vectors": [
-      [
-        7.7673999365129625,
-        0,
-        0
-      ],
-      [
-        0,
-        9.869311574261594,
-        0
-      ],
-      [
-        0,
-        0,
-        4.715180447893034
-      ]
-    ],
-    "nelements": 6,
-    "nsites": 10,
-    "pretty_formula": "Ag2CClNO4S",
-    "species": [
-      {
-        "chemical_symbols": [
-          "Ag"
-        ],
-        "concentration": [
-          1.0
-        ],
-        "name": "Ag"
-      },
-      {
-        "chemical_symbols": [
-          "C"
-        ],
-        "concentration": [
-          1.0
-        ],
-        "name": "C"
-      },
-      {
-        "chemical_symbols": [
-          "Cl"
-        ],
-        "concentration": [
-          1.0
-        ],
-        "name": "Cl"
-      },
-      {
-        "chemical_symbols": [
-          "N"
-        ],
-        "concentration": [
-          1.0
-        ],
-        "name": "N"
-      },
-      {
-        "chemical_symbols": [
-          "O"
-        ],
-        "concentration": [
-          1.0
-        ],
-        "name": "O"
-      },
-      {
-        "chemical_symbols": [
-          "S"
-        ],
-        "concentration": [
-          1.0
-        ],
-        "name": "S"
-      }
-    ],
-    "species_at_sites": [
-      "Ag",
-      "Ag",
-      "C",
-      "Cl",
-      "N",
-      "O",
-      "O",
-      "O",
-      "O",
-      "S"
-    ],
-    "structure_features": ["disorder"],
-    "task_id": "mpf_259"
-  },
   {
     "_id": {
       "$oid": "5cfb441f053b174410700e11"