diff --git a/web/redux/action-types.js b/web/redux/action-types.js
--- a/web/redux/action-types.js
+++ b/web/redux/action-types.js
@@ -6,3 +6,5 @@
 export const setDeviceIDActionType = 'SET_DEVICE_ID';
 export const updateCalendarCommunityFilter = 'UPDATE_CALENDAR_COMMUNITY_FILTER';
 export const clearCalendarCommunityFilter = 'CLEAR_CALENDAR_COMMUNITY_FILTER';
+export const updateChatCommunityFilter = 'UPDATE_CHAT_COMMUNITY_FILTER';
+export const clearChatCommunityFilter = 'CLEAR_CHAT_COMMUNITY_FILTER';
diff --git a/web/redux/community-picker-reducer.js b/web/redux/community-picker-reducer.js
--- a/web/redux/community-picker-reducer.js
+++ b/web/redux/community-picker-reducer.js
@@ -8,6 +8,8 @@
 import {
   updateCalendarCommunityFilter,
   clearCalendarCommunityFilter,
+  updateChatCommunityFilter,
+  clearChatCommunityFilter,
 } from './action-types.js';
 import type { Action, CommunityPickerStore } from './redux-setup';
 import { filterThreadIDsBelongingToCommunity } from '../selectors/calendar-selectors.js';
@@ -54,6 +56,22 @@
         calendar: null,
       },
     };
+  } else if (action.type === updateChatCommunityFilter) {
+    return {
+      calendarFilters,
+      communityPickerStore: {
+        ...communityPickerStore,
+        chat: action.payload,
+      },
+    };
+  } else if (action.type === clearChatCommunityFilter) {
+    return {
+      calendarFilters,
+      communityPickerStore: {
+        ...communityPickerStore,
+        chat: null,
+      },
+    };
   }
   return { communityPickerStore, calendarFilters };
 }
diff --git a/web/redux/redux-setup.js b/web/redux/redux-setup.js
--- a/web/redux/redux-setup.js
+++ b/web/redux/redux-setup.js
@@ -40,6 +40,8 @@
   updateWindowDimensionsActionType,
   updateCalendarCommunityFilter,
   clearCalendarCommunityFilter,
+  updateChatCommunityFilter,
+  clearChatCommunityFilter,
 } from './action-types.js';
 import { reduceCommunityPickerStore } from './community-picker-reducer.js';
 import {
@@ -123,6 +125,14 @@
   | {
       +type: 'CLEAR_CALENDAR_COMMUNITY_FILTER',
       +payload: void,
+    }
+  | {
+      +type: 'UPDATE_CHAT_COMMUNITY_FILTER',
+      +payload: string,
+    }
+  | {
+      +type: 'CLEAR_CHAT_COMMUNITY_FILTER',
+      +payload: void,
     };
 
 export function reducer(oldState: AppState | void, action: Action): AppState {
@@ -178,7 +188,9 @@
     action.type !== setPickledPrimaryAccount &&
     action.type !== setPickledNotificationAccount &&
     action.type !== updateCalendarCommunityFilter &&
-    action.type !== clearCalendarCommunityFilter
+    action.type !== clearCalendarCommunityFilter &&
+    action.type !== updateChatCommunityFilter &&
+    action.type !== clearChatCommunityFilter
   ) {
     state = baseReducer(state, action).state;
   }