diff --git a/backend/src/main/kotlin/fr/gouv/cacem/monitorenv/infrastructure/database/repositories/interfaces/IDBDepartmentAreaRepository.kt b/backend/src/main/kotlin/fr/gouv/cacem/monitorenv/infrastructure/database/repositories/interfaces/IDBDepartmentAreaRepository.kt
index 0c6b062a0..4a2ed6f43 100644
--- a/backend/src/main/kotlin/fr/gouv/cacem/monitorenv/infrastructure/database/repositories/interfaces/IDBDepartmentAreaRepository.kt
+++ b/backend/src/main/kotlin/fr/gouv/cacem/monitorenv/infrastructure/database/repositories/interfaces/IDBDepartmentAreaRepository.kt
@@ -8,7 +8,7 @@ import org.springframework.data.repository.CrudRepository
 interface IDBDepartmentAreaRepository : CrudRepository<DepartmentAreaModel, Int> {
     @Query(
         value =
-            """
+        """
         SELECT *
         FROM departments_areas
         WHERE insee_dep = :inseeCode
@@ -20,11 +20,7 @@ interface IDBDepartmentAreaRepository : CrudRepository<DepartmentAreaModel, Int>
     @Query(
         """
         WITH geom AS (
-            SELECT CASE
-                WHEN GeometryType(ST_SetSRID(:geometry, 4326)) IN ('ST_MultiPolygon', 'ST_Polygon')
-                THEN ST_Buffer(ST_SetSRID(:geometry, 4326), 0)
-                ELSE ST_SetSRID(:geometry, 4326)
-            END AS geom
+            SELECT ST_SetSRID(ST_Union(:geometry), 4326) AS geom
         ),
 
         departments_intersection_areas AS (
diff --git a/backend/src/main/kotlin/fr/gouv/cacem/monitorenv/infrastructure/database/repositories/interfaces/IDBFacadeAreasRepository.kt b/backend/src/main/kotlin/fr/gouv/cacem/monitorenv/infrastructure/database/repositories/interfaces/IDBFacadeAreasRepository.kt
index 959069208..1d439b1ea 100644
--- a/backend/src/main/kotlin/fr/gouv/cacem/monitorenv/infrastructure/database/repositories/interfaces/IDBFacadeAreasRepository.kt
+++ b/backend/src/main/kotlin/fr/gouv/cacem/monitorenv/infrastructure/database/repositories/interfaces/IDBFacadeAreasRepository.kt
@@ -9,9 +9,9 @@ interface IDBFacadeAreasRepository : CrudRepository<FacadeAreasModel, Int> {
     @Query(
         """
         WITH geom AS (
-            SELECT st_setsrid(:geometry, 4326) AS geom
+            SELECT st_setsrid(ST_Union(:geometry), 4326) AS geom
         ),
-        
+
         facades_intersection_areas AS (
             SELECT
                 facade,
@@ -30,7 +30,7 @@ interface IDBFacadeAreasRepository : CrudRepository<FacadeAreasModel, Int> {
             ON ST_Intersects(geom.geom, facade_areas_subdivided.geometry)
             GROUP BY facade
         )
-        
+
         SELECT facade
         FROM facades_intersection_areas
         ORDER BY intersection_area DESC