diff --git a/src/signals/filters.py b/src/signals/filters.py
index c95d40f..0b38d96 100644
--- a/src/signals/filters.py
+++ b/src/signals/filters.py
@@ -48,7 +48,9 @@ class SignalFilter(django_filters.FilterSet):
     )
     format_type = django_filters.MultipleChoiceFilter(choices=FormatChoices.choices)
     severenity_pyramid_rungs = django_filters.MultipleChoiceFilter(choices=SeverityPyramidRungsChoices.choices)
-    source = django_filters.ModelMultipleChoiceFilter(queryset=SourceSubdivision.objects.all())
+    source = django_filters.ModelMultipleChoiceFilter(queryset=SourceSubdivision.objects.all(),
+                                                      field_name="source_id__external_name",
+                                                      to_field_name='external_name')
     time_type = django_filters.MultipleChoiceFilter(choices=TimeTypeChoices.choices)
 
     def __init__(self, data, *args, **kwargs):
diff --git a/src/signals/forms.py b/src/signals/forms.py
index 7aacaf9..83688bd 100644
--- a/src/signals/forms.py
+++ b/src/signals/forms.py
@@ -28,7 +28,10 @@ class SignalFilterForm(forms.ModelForm):
     search = forms.CharField(min_length=3)
     pathogen = forms.ModelChoiceField(queryset=Pathogen.objects.all(), widget=forms.CheckboxSelectMultiple())
     active = forms.TypedMultipleChoiceField(choices=ActiveChoices.choices, coerce=bool, widget=forms.CheckboxSelectMultiple())
-    source = forms.MultipleChoiceField(choices=SourceSubdivision.objects.values_list('id', 'external_name'), widget=forms.CheckboxSelectMultiple())
+    source = forms.MultipleChoiceField(
+        choices=set(SourceSubdivision.objects.values_list('external_name', 'external_name')),
+        widget=forms.CheckboxSelectMultiple()
+    )
     time_type = forms.ChoiceField(choices=TimeTypeChoices.choices, widget=forms.CheckboxSelectMultiple())
     geographic_scope = forms.ModelMultipleChoiceField(queryset=GeographicScope.objects.all(), widget=forms.CheckboxSelectMultiple())
     severenity_pyramid_rungs = forms.ChoiceField(choices=SeverityPyramidRungsChoices.choices, widget=forms.CheckboxSelectMultiple())
diff --git a/src/signals/views.py b/src/signals/views.py
index 170759f..a1acb29 100644
--- a/src/signals/views.py
+++ b/src/signals/views.py
@@ -55,7 +55,7 @@ def get_url_params(self):
             "geographic_scope": [el for el in self.request.GET.getlist("geographic_scope")]
             if self.request.GET.get("geographic_scope")
             else None,
-            "source": [int(el) for el in self.request.GET.getlist("source")],
+            "source": [el for el in self.request.GET.getlist("source")],
             "time_type": [el for el in self.request.GET.getlist("time_type")],
         }
         url_params_str = ""