diff --git a/app.R b/app.R
index 8569d38..92d3ca1 100644
--- a/app.R
+++ b/app.R
@@ -730,14 +730,15 @@ server <- function(input, output, session) {
   observeEvent(c(input$state, input$district, input$distance), {
     leafletProxy('reservoir_map', session) %>%
       # Clear substations and range circle upon update
-      clearGroup(group = list('substations', 'range')) %>%
+      clearGroup(group = list('substations', 'range', 'census_tract')) %>%
       # Census tract shading within the selected congressional district
       addPolygons(
         data = current_district(),
         fillColor = ~dist_pal()(Lowmod_pct), # color of census tract shading
         color = 'black', # color of census tract borders
-        fillOpacity = 0.75, # opacity of shading
-        weight = 0.75 # width of census tract border
+        fillOpacity = 0.7, # opacity of shading
+        weight = 0.75, # width of census tract border
+        group = 'census_tract'
       ) %>%
       # Substation range circle
       addCircles(
@@ -755,7 +756,8 @@ server <- function(input, output, session) {
         data = cd_data(),
         weight = 2, 
         fillOpacity = 0, 
-        color = 'green'
+        color = 'green',
+        group = 'outline'
       ) %>%
       # Reservoirs
       addCircleMarkers(