diff --git a/atlas/modeles/repositories/vmCommunesRepository.py b/atlas/modeles/repositories/vmCommunesRepository.py
index b1d781e3b..4c9252489 100644
--- a/atlas/modeles/repositories/vmCommunesRepository.py
+++ b/atlas/modeles/repositories/vmCommunesRepository.py
@@ -56,20 +56,25 @@ def getCommuneFromInsee(connection, insee):
 
 
 def getCommunesObservationsChilds(connection, cd_ref):
+    sql = "SELECT * FROM atlas.find_all_taxons_childs(:thiscdref) AS taxon_childs(cd_nom)"
+    results = connection.execute(text(sql), thiscdref=cd_ref)
+    taxons = [cd_ref]
+    for r in results:
+        taxons.append(r.cd_nom)
+
     sql = """
-        SELECT DISTINCT (com.insee) AS insee, com.commune_maj
-        FROM atlas.vm_communes com
-        JOIN atlas.vm_observations obs
-        ON obs.insee = com.insee
-        WHERE obs.cd_ref IN (
-                SELECT * FROM atlas.find_all_taxons_childs(:thiscdref)
-            )
-            OR obs.cd_ref = :thiscdref
+        SELECT DISTINCT
+            com.commune_maj,
+            com.insee
+        FROM atlas.vm_observations AS obs
+            JOIN atlas.vm_communes AS com
+                ON obs.insee = com.insee
+        WHERE obs.cd_ref = ANY(:taxonsList)
         ORDER BY com.commune_maj ASC
     """
-    req = connection.execute(text(sql), thiscdref=cd_ref)
-    listCommunes = list()
-    for r in req:
-        temp = {"insee": r.insee, "commune_maj": r.commune_maj}
-        listCommunes.append(temp)
-    return listCommunes
+    results = connection.execute(text(sql), taxonsList=taxons)
+    municipalities = list()
+    for r in results:
+        municipality = {"insee": r.insee, "commune_maj": r.commune_maj}
+        municipalities.append(municipality)
+    return municipalities
diff --git a/atlas/modeles/repositories/vmObservationsRepository.py b/atlas/modeles/repositories/vmObservationsRepository.py
index 18fe3341a..95c7cde77 100644
--- a/atlas/modeles/repositories/vmObservationsRepository.py
+++ b/atlas/modeles/repositories/vmObservationsRepository.py
@@ -180,16 +180,19 @@ def observersParser(req):
 
 
 def getObservers(connection, cd_ref):
+    sql = "SELECT * FROM atlas.find_all_taxons_childs(:thiscdref) AS taxon_childs(cd_nom)"
+    results = connection.execute(text(sql), thiscdref=cd_ref)
+    taxons = [cd_ref]
+    for r in results:
+        taxons.append(r.cd_nom)
+
     sql = """
-    SELECT DISTINCT observateurs
-    FROM atlas.vm_observations
-    WHERE cd_ref IN (
-            SELECT * FROM atlas.find_all_taxons_childs(:thiscdref)
-        )
-        OR cd_ref = :thiscdref
+        SELECT DISTINCT observateurs
+        FROM atlas.vm_observations
+        WHERE cd_ref = ANY(:taxonsList)
     """
-    req = connection.execute(text(sql), thiscdref=cd_ref)
-    return observersParser(req)
+    results = connection.execute(text(sql), taxonsList=taxons)
+    return observersParser(results)
 
 
 def getGroupeObservers(connection, groupe):