diff --git a/app/controllers/case_contacts/form_controller.rb b/app/controllers/case_contacts/form_controller.rb
index da639f9654..7a80057c80 100644
--- a/app/controllers/case_contacts/form_controller.rb
+++ b/app/controllers/case_contacts/form_controller.rb
@@ -73,6 +73,7 @@ def get_contact_types
       .joins(:casa_case_contact_types)
       .active
       .where(casa_case_contact_types: {casa_case_id: @casa_cases.pluck(:id)})
+      .distinct
 
     if case_contact_types.present?
       case_contact_types
@@ -83,6 +84,7 @@ def get_contact_types
         .active
         .where(contact_type_group: {casa_org: current_organization})
         .order("contact_type_group.name ASC", :name)
+        .distinct
     end
   end
 
diff --git a/app/values/case_contact_parameters.rb b/app/values/case_contact_parameters.rb
index d5abc5abb6..e01e05870b 100644
--- a/app/values/case_contact_parameters.rb
+++ b/app/values/case_contact_parameters.rb
@@ -36,6 +36,7 @@ def normalize_params(params)
       params[:case_contact][:miles_driven] = convert_miles_driven(params)
     end
     params[:case_contact][:notes] = params.dig(:case_contact, :notes).presence
+    params[:case_contact][:contact_type_ids] = params[:case_contact][:contact_type_ids]&.uniq
 
     params
   end
diff --git a/spec/requests/case_contacts/form_spec.rb b/spec/requests/case_contacts/form_spec.rb
index ea62581259..183a40321c 100644
--- a/spec/requests/case_contacts/form_spec.rb
+++ b/spec/requests/case_contacts/form_spec.rb
@@ -212,6 +212,18 @@
       end
     end
 
+    context "with duplicate contact type ids in params" do
+      let(:contact_type_ids) { [contact_types.first.id, contact_types.first.id] }
+
+      it "dedupes and updates the contact type ids" do
+        expect(case_contact.contact_type_ids).to be_empty
+        request
+        expect(response).to have_http_status(:redirect)
+
+        expect(case_contact.reload.contact_type_ids).to contain_exactly(contact_types.first.id)
+      end
+    end
+
     context "when contact types were previously assigned" do
       before { case_contact.update!(contact_type_ids: [contact_types.second.id]) }