• CSO Public Notification Program

    MSD sponsors a combined sewer overflow (CSO) notification program to alert Hamilton County residents when existing or predicted weather conditions are likely to cause CSOs into local creeks and rivers, or sewer backups into buildings.

    MSD issues alerts when a rainfall of 1/4 inch or more is predicted or recorded for Hamilton County, or when water levels in area rivers and streams are elevated.

    The alerts urge residents to avoid contact with streams or rivers for at least 72 hours after a rainfall or at least 72 hours after water levels in area waterways have returned to normal.

    This includes activities such as boating, wading, fishing and swimming. Signs are posted at each CSO discharge location along the Mill Creek, Little Miami, Muddy Creek and Ohio River and tributaries.

    CSO 5 Outfall Sign A CSO is a discharge of untreated sewage and stormwater from a combined sewer into the environment. CSOs typically occur when combined sewers fill up with too much water for the system to handle, most often during heavy rains, and the excess water is released into a stream or river. Power failures and pipe blockages also can cause CSOs during dry weather.

    The alerts also encourage MSD customers to report sewer backups 24/7 at (513) 352-4900 or online at sbu.msdgc.org.

    MSD is making much-needed improvements to the sewer system to reduce and control CSOs. Visit the Project Groundwork website for more information.

    Receiving CSO Notifications

    There are two ways to receive a CSO Notification:

    By phone: Call the CSO Information Line at (513) 244-5116 to listen to the latest notification.

    By email: You can receive CSO Advisories in your inbox by subscribing to the CSO Public Notification mailing list. Subscriptions are free and are easy to setup, just click the Sign Up button below and enter in your name and email:


    Sign Up Now

    Once submitted you will receive a confirmation email for your subscription. If you have any questions about this system, please contact the msdgc.org Webmaster.

    Please Note: If you were subscribed to the CSO Notification list prior to May 13, 2015, we ask that you please subscribe again. Thank you!

    Contact Us

    Report a Sewer Backup:
    (513) 352-4900 24/7 or online

    Customer Call Center:
    (513) 352-4900 24/7

    Project Customer Service:
    (513) 557-3594

    Development Services:
    (513) 244-1330

    Media Inquiries:
    (513) 557-7095


    MSD Mailing Address:
    1600 Gest St.
    Cincinnati, Ohio 45204

    MSD Facilities and Directions


    Photo of MSD CSO structure