diff --git a/CreateMessage/index.ts b/CreateMessage/index.ts
index 0f38214c..5cc939c2 100644
--- a/CreateMessage/index.ts
+++ b/CreateMessage/index.ts
@@ -22,7 +22,7 @@ import {
   initAppInsights,
   withAppInsightsContext
 } from "io-functions-commons/dist/src/utils/application_insights";
-import { getDocumentClient } from "../utils/cosmosdb";
+import { documentClient } from "../utils/cosmosdb";
 import { CreateMessage } from "./handler";
 
 // Setup Express
@@ -32,8 +32,6 @@ secureExpressApp(app);
 // Set up CORS (free access to the API from browser clients)
 app.use(cors());
 
-const cosmosDbUri = getRequiredStringEnv("COSMOSDB_URI");
-const cosmosDbKey = getRequiredStringEnv("COSMOSDB_KEY");
 const cosmosDbName = getRequiredStringEnv("COSMOSDB_NAME");
 const messageContainerName = getRequiredStringEnv("MESSAGE_CONTAINER_NAME");
 
@@ -47,8 +45,6 @@ const servicesCollectionUrl = documentDbUtils.getCollectionUri(
   SERVICE_COLLECTION_NAME
 );
 
-const documentClient = getDocumentClient(cosmosDbUri, cosmosDbKey);
-
 const messageModel = new MessageModel(
   documentClient,
   messagesCollectionUrl,
diff --git a/CreateNotificationActivity/index.ts b/CreateNotificationActivity/index.ts
index 8c78eb22..8a48a01b 100644
--- a/CreateNotificationActivity/index.ts
+++ b/CreateNotificationActivity/index.ts
@@ -24,7 +24,7 @@ import {
 import * as documentDbUtils from "io-functions-commons/dist/src/utils/documentdb";
 import { getRequiredStringEnv } from "io-functions-commons/dist/src/utils/env";
 
-import { getDocumentClient } from "../utils/cosmosdb";
+import { documentClient } from "../utils/cosmosdb";
 import { getCreateNotificationActivityHandler } from "./handler";
 
 const sandboxFiscalCode = FiscalCode.decode(
@@ -36,17 +36,10 @@ const sandboxFiscalCode = FiscalCode.decode(
 });
 
 // Setup DocumentDB
-const cosmosDbUri = getRequiredStringEnv("COSMOSDB_URI");
-const cosmosDbKey = getRequiredStringEnv("COSMOSDB_KEY");
 const cosmosDbName = getRequiredStringEnv("COSMOSDB_NAME");
 
 const documentDbDatabaseUrl = documentDbUtils.getDatabaseUri(cosmosDbName);
 
-// We create the db client, services and models here
-// as if any error occurs during the construction of these objects
-// that would be unrecoverable anyway and we neither may trig a retry
-const documentClient = getDocumentClient(cosmosDbUri, cosmosDbKey);
-
 const notificationsCollectionUrl = documentDbUtils.getCollectionUri(
   documentDbDatabaseUrl,
   NOTIFICATION_COLLECTION_NAME
diff --git a/EmailNotificationActivity/index.ts b/EmailNotificationActivity/index.ts
index 0c89c7b4..c3f9737f 100644
--- a/EmailNotificationActivity/index.ts
+++ b/EmailNotificationActivity/index.ts
@@ -21,21 +21,14 @@ import * as documentDbUtils from "io-functions-commons/dist/src/utils/documentdb
 import { getRequiredStringEnv } from "io-functions-commons/dist/src/utils/env";
 import { MailUpTransport } from "io-functions-commons/dist/src/utils/mailup";
 
-import { getDocumentClient } from "../utils/cosmosdb";
+import { documentClient } from "../utils/cosmosdb";
 import { getEmailNotificationActivityHandler } from "./handler";
 
 // Setup DocumentDB
-const cosmosDbUri = getRequiredStringEnv("COSMOSDB_URI");
-const cosmosDbKey = getRequiredStringEnv("COSMOSDB_KEY");
 const cosmosDbName = getRequiredStringEnv("COSMOSDB_NAME");
 
 const documentDbDatabaseUrl = documentDbUtils.getDatabaseUri(cosmosDbName);
 
-// We create the db client, services and models here
-// as if any error occurs during the construction of these objects
-// that would be unrecoverable anyway and we neither may trig a retry
-const documentClient = getDocumentClient(cosmosDbUri, cosmosDbKey);
-
 const notificationsCollectionUrl = documentDbUtils.getCollectionUri(
   documentDbDatabaseUrl,
   NOTIFICATION_COLLECTION_NAME
diff --git a/GetLimitedProfile/index.ts b/GetLimitedProfile/index.ts
index 253e071d..d92280d5 100644
--- a/GetLimitedProfile/index.ts
+++ b/GetLimitedProfile/index.ts
@@ -15,7 +15,7 @@ import { secureExpressApp } from "io-functions-commons/dist/src/utils/express";
 import { setAppContext } from "io-functions-commons/dist/src/utils/middlewares/context_middleware";
 import createAzureFunctionHandler from "io-functions-express/dist/src/createAzureFunctionsHandler";
 
-import { getDocumentClient } from "../utils/cosmosdb";
+import { documentClient } from "../utils/cosmosdb";
 import { GetLimitedProfile } from "./handler";
 
 // Setup Express
@@ -25,12 +25,8 @@ secureExpressApp(app);
 // Set up CORS (free access to the API from browser clients)
 app.use(cors());
 
-const cosmosDbUri = getRequiredStringEnv("COSMOSDB_URI");
-const cosmosDbKey = getRequiredStringEnv("COSMOSDB_KEY");
 const cosmosDbName = getRequiredStringEnv("COSMOSDB_NAME");
 
-const documentClient = getDocumentClient(cosmosDbUri, cosmosDbKey);
-
 const documentDbDatabaseUrl = documentDbUtils.getDatabaseUri(cosmosDbName);
 
 const servicesCollectionUrl = documentDbUtils.getCollectionUri(
diff --git a/GetLimitedProfileByPOST/index.ts b/GetLimitedProfileByPOST/index.ts
index a111f57b..8cb8546c 100644
--- a/GetLimitedProfileByPOST/index.ts
+++ b/GetLimitedProfileByPOST/index.ts
@@ -15,15 +15,11 @@ import { secureExpressApp } from "io-functions-commons/dist/src/utils/express";
 import { setAppContext } from "io-functions-commons/dist/src/utils/middlewares/context_middleware";
 import createAzureFunctionHandler from "io-functions-express/dist/src/createAzureFunctionsHandler";
 
-import { getDocumentClient } from "../utils/cosmosdb";
+import { documentClient } from "../utils/cosmosdb";
 import { GetLimitedProfileByPOST } from "./handler";
 
-const cosmosDbUri = getRequiredStringEnv("COSMOSDB_URI");
-const cosmosDbKey = getRequiredStringEnv("COSMOSDB_KEY");
 const cosmosDbName = getRequiredStringEnv("COSMOSDB_NAME");
 
-const documentClient = getDocumentClient(cosmosDbUri, cosmosDbKey);
-
 const documentDbDatabaseUrl = documentDbUtils.getDatabaseUri(cosmosDbName);
 
 const servicesCollectionUrl = documentDbUtils.getCollectionUri(
diff --git a/GetMessage/index.ts b/GetMessage/index.ts
index 0d54c7fb..7b5e39d4 100644
--- a/GetMessage/index.ts
+++ b/GetMessage/index.ts
@@ -32,7 +32,7 @@ import {
   NotificationStatusModel
 } from "io-functions-commons/dist/src/models/notification_status";
 
-import { getDocumentClient } from "../utils/cosmosdb";
+import { documentClient } from "../utils/cosmosdb";
 import { GetMessage } from "./handler";
 
 // Setup Express
@@ -42,8 +42,6 @@ secureExpressApp(app);
 // Set up CORS (free access to the API from browser clients)
 app.use(cors());
 
-const cosmosDbUri = getRequiredStringEnv("COSMOSDB_URI");
-const cosmosDbKey = getRequiredStringEnv("COSMOSDB_KEY");
 const cosmosDbName = getRequiredStringEnv("COSMOSDB_NAME");
 const messageContainerName = getRequiredStringEnv("MESSAGE_CONTAINER_NAME");
 
@@ -69,8 +67,6 @@ const notificationsStatusCollectionUrl = documentDbUtils.getCollectionUri(
   NOTIFICATION_STATUS_COLLECTION_NAME
 );
 
-const documentClient = getDocumentClient(cosmosDbUri, cosmosDbKey);
-
 const messageModel = new MessageModel(
   documentClient,
   messagesCollectionUrl,
diff --git a/GetSubscriptionsFeed/index.ts b/GetSubscriptionsFeed/index.ts
index d250d361..d8383703 100644
--- a/GetSubscriptionsFeed/index.ts
+++ b/GetSubscriptionsFeed/index.ts
@@ -15,7 +15,7 @@ import { setAppContext } from "io-functions-commons/dist/src/utils/middlewares/c
 
 import createAzureFunctionHandler from "io-functions-express/dist/src/createAzureFunctionsHandler";
 
-import { getDocumentClient } from "../utils/cosmosdb";
+import { documentClient } from "../utils/cosmosdb";
 import { GetSubscriptionsFeed } from "./handler";
 
 // Setup Express
@@ -25,8 +25,6 @@ secureExpressApp(app);
 // Set up CORS (free access to the API from browser clients)
 app.use(cors());
 
-const cosmosDbUri = getRequiredStringEnv("COSMOSDB_URI");
-const cosmosDbKey = getRequiredStringEnv("COSMOSDB_KEY");
 const cosmosDbName = getRequiredStringEnv("COSMOSDB_NAME");
 
 const documentDbDatabaseUrl = documentDbUtils.getDatabaseUri(cosmosDbName);
@@ -36,8 +34,6 @@ const servicesCollectionUrl = documentDbUtils.getCollectionUri(
   SERVICE_COLLECTION_NAME
 );
 
-const documentClient = getDocumentClient(cosmosDbUri, cosmosDbKey);
-
 const serviceModel = new ServiceModel(documentClient, servicesCollectionUrl);
 
 const storageConnectionString = getRequiredStringEnv("QueueStorageConnection");
diff --git a/MessageStatusUpdaterActivity/index.ts b/MessageStatusUpdaterActivity/index.ts
index bf15b86b..56afbb4b 100644
--- a/MessageStatusUpdaterActivity/index.ts
+++ b/MessageStatusUpdaterActivity/index.ts
@@ -7,17 +7,13 @@ import {
 import * as documentDbUtils from "io-functions-commons/dist/src/utils/documentdb";
 import { getRequiredStringEnv } from "io-functions-commons/dist/src/utils/env";
 
-import { getDocumentClient } from "../utils/cosmosdb";
+import { documentClient } from "../utils/cosmosdb";
 import { getMessageStatusUpdaterActivityHandler } from "./handler";
 
-const cosmosDbUri = getRequiredStringEnv("COSMOSDB_URI");
-const cosmosDbKey = getRequiredStringEnv("COSMOSDB_KEY");
 const cosmosDbName = getRequiredStringEnv("COSMOSDB_NAME");
 
 const documentDbDatabaseUrl = documentDbUtils.getDatabaseUri(cosmosDbName);
 
-const documentClient = getDocumentClient(cosmosDbUri, cosmosDbKey);
-
 const messagesStatusCollectionUrl = documentDbUtils.getCollectionUri(
   documentDbDatabaseUrl,
   MESSAGE_STATUS_COLLECTION_NAME
diff --git a/NotificationStatusUpdaterActivity/index.ts b/NotificationStatusUpdaterActivity/index.ts
index 35f6e1d6..13fd9be5 100644
--- a/NotificationStatusUpdaterActivity/index.ts
+++ b/NotificationStatusUpdaterActivity/index.ts
@@ -19,22 +19,15 @@ import {
 } from "io-functions-commons/dist/src/models/notification_status";
 import { getRequiredStringEnv } from "io-functions-commons/dist/src/utils/env";
 
-import { getDocumentClient } from "../utils/cosmosdb";
+import { documentClient } from "../utils/cosmosdb";
 import { getNotificationStatusUpdaterActivityHandler } from "./handler";
 
 // Setup DocumentDB
 
-const cosmosDbUri = getRequiredStringEnv("COSMOSDB_URI");
-const cosmosDbKey = getRequiredStringEnv("COSMOSDB_KEY");
 const cosmosDbName = getRequiredStringEnv("COSMOSDB_NAME");
 
 const documentDbDatabaseUrl = documentDbUtils.getDatabaseUri(cosmosDbName);
 
-// We create the db client, services and models here
-// as if any error occurs during the construction of these objects
-// that would be unrecoverable anyway and we neither may trig a retry
-const documentClient = getDocumentClient(cosmosDbUri, cosmosDbKey);
-
 const notificationStatusCollectionUrl = documentDbUtils.getCollectionUri(
   documentDbDatabaseUrl,
   NOTIFICATION_STATUS_COLLECTION_NAME
diff --git a/StoreMessageContentActivity/index.ts b/StoreMessageContentActivity/index.ts
index b640928b..a0efc919 100644
--- a/StoreMessageContentActivity/index.ts
+++ b/StoreMessageContentActivity/index.ts
@@ -11,21 +11,14 @@ import {
 } from "io-functions-commons/dist/src/models/profile";
 import * as documentDbUtils from "io-functions-commons/dist/src/utils/documentdb";
 import { getRequiredStringEnv } from "io-functions-commons/dist/src/utils/env";
-import { getDocumentClient } from "../utils/cosmosdb";
+import { documentClient } from "../utils/cosmosdb";
 import { getStoreMessageContentActivityHandler } from "./handler";
 
 // Setup DocumentDB
-const cosmosDbUri = getRequiredStringEnv("COSMOSDB_URI");
-const cosmosDbKey = getRequiredStringEnv("COSMOSDB_KEY");
 const cosmosDbName = getRequiredStringEnv("COSMOSDB_NAME");
 
 const documentDbDatabaseUrl = documentDbUtils.getDatabaseUri(cosmosDbName);
 
-// We create the db client, services and models here
-// as if any error occurs during the construction of these objects
-// that would be unrecoverable anyway and we neither may trig a retry
-const documentClient = getDocumentClient(cosmosDbUri, cosmosDbKey);
-
 const profilesCollectionUrl = documentDbUtils.getCollectionUri(
   documentDbDatabaseUrl,
   PROFILE_COLLECTION_NAME
diff --git a/WebhookNotificationActivity/index.ts b/WebhookNotificationActivity/index.ts
index 2c93eb0f..5a0268a4 100644
--- a/WebhookNotificationActivity/index.ts
+++ b/WebhookNotificationActivity/index.ts
@@ -18,22 +18,15 @@ import {
 } from "italia-ts-commons/lib/fetch";
 import { Millisecond } from "italia-ts-commons/lib/units";
 
-import { getDocumentClient } from "../utils/cosmosdb";
+import { documentClient } from "../utils/cosmosdb";
 import { getNotifyClient } from "./client";
 import { getWebhookNotificationActivityHandler } from "./handler";
 
 // Setup DocumentDB
-const cosmosDbUri = getRequiredStringEnv("COSMOSDB_URI");
-const cosmosDbKey = getRequiredStringEnv("COSMOSDB_KEY");
 const cosmosDbName = getRequiredStringEnv("COSMOSDB_NAME");
 
 const documentDbDatabaseUrl = documentDbUtils.getDatabaseUri(cosmosDbName);
 
-// We create the db client, services and models here
-// as if any error occurs during the construction of these objects
-// that would be unrecoverable anyway and we neither may trig a retry
-const documentClient = getDocumentClient(cosmosDbUri, cosmosDbKey);
-
 const notificationsCollectionUrl = documentDbUtils.getCollectionUri(
   documentDbDatabaseUrl,
   NOTIFICATION_COLLECTION_NAME
diff --git a/utils/cosmosdb.ts b/utils/cosmosdb.ts
index cac229e3..2b926eb7 100644
--- a/utils/cosmosdb.ts
+++ b/utils/cosmosdb.ts
@@ -2,17 +2,11 @@
  * Use a singleton CosmosDB client across functions.
  */
 import { DocumentClient as DocumentDBClient } from "documentdb";
+import { getRequiredStringEnv } from "io-functions-commons/dist/src/utils/env";
 
-// tslint:disable-next-line: no-let
-let instance: DocumentDBClient;
+const cosmosDbUri = getRequiredStringEnv("COSMOSDB_URI");
+const masterKey = getRequiredStringEnv("COSMOSDB_KEY");
 
-export function getDocumentClient(
-  cosmosDbUri: string,
-  cosmosDbKey: string
-): DocumentDBClient {
-  return instance
-    ? instance
-    : (instance = new DocumentDBClient(cosmosDbUri, {
-        masterKey: cosmosDbKey
-      }));
-}
+export const documentClient = new DocumentDBClient(cosmosDbUri, {
+  masterKey
+});