diff --git a/app/dao/fact_notification_status_dao.py b/app/dao/fact_notification_status_dao.py
index ae7d816a3..2caa68379 100644
--- a/app/dao/fact_notification_status_dao.py
+++ b/app/dao/fact_notification_status_dao.py
@@ -154,23 +154,25 @@ def fetch_notification_status_for_service_for_today_and_7_previous_days(service_
         FactNotificationStatus.bst_date >= start_date,
         FactNotificationStatus.key_type != KEY_TYPE_TEST
     )
+    if str(service_id) in (current_app.config['HIGH_VOLUME_SERVICE']):
+        all_stats_table = stats_for_7_days.subquery()
+    else:
+        stats_for_today = db.session.query(
+            Notification.notification_type.cast(db.Text),
+            Notification.status,
+            *([Notification.template_id] if by_template else []),
+            func.count().label('count')
+        ).filter(
+            Notification.created_at >= get_london_midnight_in_utc(now),
+            Notification.service_id == service_id,
+            Notification.key_type != KEY_TYPE_TEST
+        ).group_by(
+            Notification.notification_type,
+            *([Notification.template_id] if by_template else []),
+            Notification.status
+        )
 
-    stats_for_today = db.session.query(
-        Notification.notification_type.cast(db.Text),
-        Notification.status,
-        *([Notification.template_id] if by_template else []),
-        func.count().label('count')
-    ).filter(
-        Notification.created_at >= get_london_midnight_in_utc(now),
-        Notification.service_id == service_id,
-        Notification.key_type != KEY_TYPE_TEST
-    ).group_by(
-        Notification.notification_type,
-        *([Notification.template_id] if by_template else []),
-        Notification.status
-    )
-
-    all_stats_table = stats_for_7_days.union_all(stats_for_today).subquery()
+        all_stats_table = stats_for_7_days.union_all(stats_for_today).subquery()
 
     query = db.session.query(
         *([
diff --git a/tests/app/dao/test_fact_notification_status_dao.py b/tests/app/dao/test_fact_notification_status_dao.py
index f807541a0..6f9ed01b1 100644
--- a/tests/app/dao/test_fact_notification_status_dao.py
+++ b/tests/app/dao/test_fact_notification_status_dao.py
@@ -3,6 +3,7 @@ from uuid import UUID
 
 import mock
 import pytest
+from flask import current_app
 from freezegun import freeze_time
 
 from app.dao.fact_notification_status_dao import (
@@ -44,6 +45,7 @@ from tests.app.db import (
     create_service_data_retention,
     create_template,
 )
+from tests.conftest import set_config_values
 
 
 def test_update_fact_notification_status(notify_db_session):
@@ -267,6 +269,56 @@ def test_fetch_notification_status_for_service_for_today_and_7_previous_days(not
     assert results[3].count == 19
 
 
+@freeze_time('2018-10-31T18:00:00')
+def test_fetch_notification_status_for_service_for_today_and_7_previous_days_for_high_volume_service(
+        notify_api, notify_db_session
+):
+    service_1 = create_service(service_name='service_1')
+    sms_template = create_template(service=service_1, template_type=SMS_TYPE)
+    sms_template_2 = create_template(service=service_1, template_type=SMS_TYPE)
+    email_template = create_template(service=service_1, template_type=EMAIL_TYPE)
+
+    create_ft_notification_status(date(2018, 10, 29), 'sms', service_1, count=10)
+    create_ft_notification_status(date(2018, 10, 24), 'sms', service_1, count=8)
+    create_ft_notification_status(date(2018, 10, 29), 'sms', service_1, notification_status='created')
+    create_ft_notification_status(date(2018, 10, 29), 'email', service_1, count=3)
+    create_ft_notification_status(date(2018, 10, 26), 'letter', service_1, count=5)
+
+    create_notification(sms_template, created_at=datetime(2018, 10, 31, 11, 0, 0))
+    create_notification(sms_template_2, created_at=datetime(2018, 10, 31, 11, 0, 0))
+    create_notification(sms_template, created_at=datetime(2018, 10, 31, 12, 0, 0), status='delivered')
+    create_notification(email_template, created_at=datetime(2018, 10, 31, 13, 0, 0), status='delivered')
+
+    # too early, shouldn't be included
+    create_notification(service_1.templates[0], created_at=datetime(2018, 10, 30, 12, 0, 0), status='delivered')
+    with set_config_values(current_app, {
+        'HIGH_VOLUME_SERVICE': [str(service_1.id)],
+
+    }):
+        results = sorted(
+            fetch_notification_status_for_service_for_today_and_7_previous_days(service_1.id),
+            key=lambda x: (x.notification_type, x.status)
+        )
+
+    assert len(results) == 4
+
+    assert results[0].notification_type == 'email'
+    assert results[0].status == 'delivered'
+    assert results[0].count == 3
+
+    assert results[1].notification_type == 'letter'
+    assert results[1].status == 'delivered'
+    assert results[1].count == 5
+
+    assert results[2].notification_type == 'sms'
+    assert results[2].status == 'created'
+    assert results[2].count == 1
+
+    assert results[3].notification_type == 'sms'
+    assert results[3].status == 'delivered'
+    assert results[3].count == 18
+
+
 @freeze_time('2018-10-31T18:00:00')
 def test_fetch_notification_status_by_template_for_service_for_today_and_7_previous_days(notify_db_session):
     service_1 = create_service(service_name='service_1')