diff --git a/views.py b/views.py
index 5f99b17..6cf1b62 100644
--- a/views.py
+++ b/views.py
@@ -412,7 +412,6 @@ class UpperLimitView(APIView):
             .values("hpid")
             .annotate(
                 counts=Sum("counts"),
-                contaminated=Max("contaminated"),
             )
             .order_by("hpid")
         )
@@ -423,7 +422,14 @@ class UpperLimitView(APIView):
         # get lists of healpix indices and count values
         map_healpix_list = [d["hpid"] for d in map_pixels_list]
         map_counts_list = [d["counts"] for d in map_pixels_list]
-        map_contaminated_list = [d["contaminated"] for d in map_pixels_list]
+
+        cont_dict = dict(
+            Pixel.objects.filter(hpid__in=map_healpix_list, survey__in=survey_numbers)
+            .values_list("hpid", "contaminated")
+            .distinct()
+        )
+
+        map_contaminated_list = [cont_dict[h] for h in map_healpix_list]
 
         # set map nside
         map_nside = 4096