Overflow Map

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Disclaimer

Overflow Map  

This map shows the locations of overflows on the Scottish Water network with Event Duration Monitoring (EDM). It provides near real time information on monitor activations and is updated every 60 minutes. However, not all the overflows update at the same frequency.

Important Note 

EDM monitors do not confirm overflow events, they only indicate them. There may be times when errors occur, eg. due to maintenance activity or movement close to the monitor. We are continually working to improve our data.

We want our information to help water users make more informed decisions but this should not be considered as advice on water quality.

You can see if our data monitors indicate:

  • an overflow is currently occurring or has occurred in the last 48 hours
  • the total duration of overflow events in the last 48 hours
  • the date and time of the most recent and previous overflow events
  • the overflow’s priority for planned future investment

Data Re-use 

Other overflow maps may use different icons, colours, descriptions, and statuses. We are not responsible for how third parties may re-use our data. For accuracy, we advise you to refer to the data presented on the official Scottish Water website.

Using this map, you agree that we and our partners are not liable for your interpretation of this information.

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Cluster of locations

Multiple overflows at one location

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    Overflow Map FAQs

    What does the overflow map show?

    The map shows all Scottish Water monitored overflows for which we can publish data in near real-time. Some parts of the system are operated on our behalf by Private Finance Initiative (PFI) companies.  Scottish Water does not publish this information.

    As we continue our review/verification processes and monitor installation programme, we will look to publish data for further monitored overflows in future.

    Does the overflow map only show CSOs?

    Not all overflows are Combined Sewer Overflows (CSOs). The overflow map shows all Scottish Water monitored overflows for which we can publish data in near real-time, including:

    • Combined Sewer Overflows (CSOs), which stop the system from becoming overwhelmed during heavy rainfall
    • Settled Storm Sewage Overflows (SSSOs), a form of CSO that provides a level of treatment or settlement before discharge
    • Emergency Overflows (EOs), which should only operate in the event of sewer system failure and should not operate in response to rainfall

    How many overflows are currently on the map?

    There are [XX] overflows included on the map. This includes 1,000 new monitors installed as part of our commitments in the Improving Urban Waters Routemap and existing monitors for which we are able to publish data. 

    What does near real-time mean?
    Near real time means the data on the overflow status and the duration of an overflow event available within the past 48 hours.

    How often is the map updated?

    The map is updated every 60 minutes based on available information and the last time the map was updated is included top right above the map.

    However, not all overflows have data updates at the same frequency so we have included the last date and time the individual overflow data was updated.

     


    Will the overflow map show if it's safe to swim or enter the water?

    The map, and associated data, don't advise if it's safe to swim or enter the water. Overflows are just one of several sources that could impact the water quality and safety of waterbodies, and these can vary depending on the surrounding area.

    For the latest information on bathing water quality visit: Bathing Waters | Home | Scottish Environment Protection Agency (SEPA)

    The map will only indicate if a monitor has been activated and an overflow event may have occurred. Planned investment priority information is included.

    Here are just some of the factors that could have an impact on water quality:

    • Agricultural run-off from farmland
    • Discharges from private systems such as septic tanks and overflows
    • Road run off from surrounding roads and highway drainage systems
    • Waste pipes from houses wrongly connected into surface water sewers or culverts
    • Domestic animal waste, such as dogs, farming livestock, wild animals and birds
    • Human behaviour, due to items wrongly disposed of down sinks and toilets

    Further information is available at:  

    River basin management planning | Scottish Environment Protection Agency (SEPA)

    Nature Calls

    Why is there no rainfall information on the map?
    We’re committed to further development of the overflow map. We will consider adding rainfall data in the future, to allow users to see rainfall in relation to any overflow events, indicating the overflows are working as they should.

    If you would like to provide feedback on your experience using the map with suggestions for us to make further improvements please use the Feedback Form at the bottom of this page.

    Why can I only see a few map points?

    The map uses clustering to avoid being overwhelmed with information. To make it easier for users, the EDM monitor locations are clustered around a central point using a blue circular icon, with the number of monitor locations displayed. To see individual locations, users should select the circle icon which will zoom in to show the separate colour-coded water drop map points so you can choose which location to view.

    A double water drop icon indicates there are multiple overflows at the same location. Once this icon is selected, the individual overflows will be displayed and you can choose the details you wish to view.

    What do the numbers mean on the blue circle map points?
    The numbers indicate all the Event Duration Monitors (EDM) within that geographical area. To see individual locations, users should select the circle icon which will zoom in to show the separate colour-coded water drop map points so you can choose which location to view.

    Why is the icon status showing No Data Available?

    There are several reasons why an Event Duration Monitor (EDM) may be showing no data available.

    • The EDM may be faulty or damaged and needs to be repaired. We will be aware of this and repairs will be underway as soon as possible
    • The EDM data quality needs to be investigated
    • The EDM is undergoing planned maintenance
    • The EDM has communications issues which means we are not currently receiving data from the monitor

    Does the overflow map show all overflows or only those with monitors?
    The map currently shows Scottish Water monitored overflows for which we can report data in near real-time. We will continue to review the information available and may update this in the future.

    Does the overflow map show monitor locations?
    The map icons show the point where the excess waste water overflows into the waterbody. This may be some distance from the overflow or the monitor itself.

    Does the map show the volume of any overflow event?
    Event Duration Monitors (EDMs) only provide the start and stop times, and duration of overflows.  In some cases, we are required to report volume or an estimated volume, which is why this is included in the published reported data.

    How accurate is the data?
    Event Duration Monitor (EDM) data doesn’t confirm an overflow event, it only indicates there is a potential overflow event. For example, the monitors can be very sensitive and can be set off by simple vegetation movement.

    How does Scottish Water use the near real-time data?
    We use the data to help inform operational responses and investment priorities. It also supports annual reporting and publication.

    Feedback

    We've worked hard to develop this overflow map and hope you find it useful. We're committed to further improvements and we'd love to hear your thoughts on your experience using the map to help us get it right. Feedback will be anonymous and we will not respond directly.

    Feedback Form

    Discover More

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    Published Overflow Data

    Scottish Water Reported Overflow Event Data to SEPA 2019-2023 and Other Overflow Event Data for 2022 & 2023 we have published
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    Prioritisation of Sewer Overflows in Scotland

    High priority assets that have been identified through study and subsequently prioritised for improvement

    Overflows Explained

    Overflows are a vital part of the wastewater network but how do they work and why do we need them?
    View of the River Kelvin

    Improving Urban Waters Routemap

    We've committed to a routemap of improving our urban waters.