Sewage Map

Dee (N. Wales) sewage map and spill data

24 storm overflows listed in the 2025 annual return name this water. 2 companies operate them. Check the latest company report for each outlet below.

24
Outlet records
489
Spills in 2025
1,937
Recorded hours
4
Linked to a live feed

1 records show monitor operation below 90%. Annual figures describe the whole of 2025, not today.

Water companies on this water

Official waterbody record ↗How spills are countedSearch the national map

Outlets on Dee (N. Wales)

Filter by the latest company report. The map follows the filters.

Filters apply to the map and list. Recent stops need a current report and a recorded stop time. They do not show whether water is safe.

Showing 10 of 24 outlets

Open full map
  • 50 Mount Pleasant Saltney Chester

    Dŵr Cymru Welsh Water · River Dee

    Current status unknown
    2025 annual record:57spills94.3hours
  • Cedar Way CSO

    Dŵr Cymru Welsh Water · River Dee

    Current status unknown
    2025 annual record:0spills0hours
  • Chester

    Dŵr Cymru Welsh Water · Esturial Waters of the River Dee

    Current status unknown
    2025 annual record:26spills149hours
  • Chester

    Dŵr Cymru Welsh Water · Esturial Waters of the River Dee

    Current status unknown
    2025 annual record:28spills56hours
  • Chester Castle Drive

    Dŵr Cymru Welsh Water · River Dee

    Current status unknown
    2025 annual record:4spills1.8hours
  • Chester Crane St Waste Ground Nr Manweb

    Dŵr Cymru Welsh Water · River Dee

    Current status unknown
    2025 annual record:20spills34.5hours
  • Chester Curzon Park North No 22

    Dŵr Cymru Welsh Water · Tributary of the River Dee

    Current status unknown
    2025 annual record:1spill0.3hours
  • Chester Edgars Park

    Dŵr Cymru Welsh Water · River Dee

    Current status unknown
    2025 annual record:10spills4hours
  • Chester Grosvenor Bridge

    Dŵr Cymru Welsh Water · River Dee

    Current status unknown
    2025 annual record:13spills38.5hours
  • Chester Hydro Dee Bridge

    Dŵr Cymru Welsh Water · River Dee

    Current status unknown
    2025 annual record:0spills0hours

Most recorded spills in 2025

The highest 2025 counts among these outlets. A count is events, not volume or harm. Equal counts share a rank.

  1. 1
    Greenfield Halls Factory Yard Nra

    Dŵr Cymru Welsh Water

    80spills
  2. 2
    Chester The Dingle Manhole 1405

    Dŵr Cymru Welsh Water

    66spills
  3. 3
    Neston

    Dŵr Cymru Welsh Water

    63spills
  4. 4
    Neston Marshlands Road

    Dŵr Cymru Welsh Water

    61spills
  5. 5
    50 Mount Pleasant Saltney Chester

    Dŵr Cymru Welsh Water

    57spills

Spills over time

The median outlet on Dee (N. Wales) recorded 9 spills in 2025, against 11 across England.

19 outlets have a comparable count for both 2024 and 2025, with the monitor working at least 90% of each year. 1 recorded more spills, 15 fewer and 3 the same. Together they went from 715 to 346 spills, a fall of 52%.

Largest rises from 2024 to 2025

YearOutlets with a countTotal spillsMedian per outletEngland median
202524489911
2024237431719
202331866720
202241423313
2021427273.519

Earlier returns list fewer of these outlets, so totals are not comparable between years. The median per outlet and the like-for-like change are fairer comparisons. Counts are events, not volume.

All outlet records on Dee (N. Wales)

24 outlet records in alphabetical order. Each link opens the outlet page with its latest report and annual history.

Sources and dates

Outlet locations, waterbody links and spill figures come from the Environment Agency 2025 event duration monitoring annual return. The latest company reports come from each operator’s live feed and carry their own dates. Waterbody ID: GB531106708200. The official waterbody record is a source lookup; its classification is not imported here.

All sourcesHow the data worksReport pollution

Questions about Dee (N. Wales)

Which outlets are linked to Dee (N. Wales)?
The source links 24 outlet records to waterbody GB531106708200. The link comes from the annual return; it does not model where a discharge travelled.
How many spills were recorded for Dee (N. Wales)?
24 records report 489 spills in 2025 and 1,937 recorded hours. All listed records have a usable count. Outlets can discharge at the same time, so the hours are not the time the whole water was affected.
Who is responsible for the outlets on Dee (N. Wales)?
2 companies operate listed outlets: Dŵr Cymru Welsh Water, United Utilities. Each outlet page names its operator and permit reference.
Which outlets on Dee (N. Wales) are linked to a live feed?
4 of the 24 records are matched to a monitor in a company live feed. A link does not mean the monitor is working now. Use the status filters above to see the latest report for each outlet, with its date. The rest show annual figures only.
How complete is the monitoring for Dee (N. Wales)?
1 of the listed records have monitor operation below 90% for 2025. Events can be missed when a monitor is not working, so low counts from those outlets may understate activity.
Does this show if Dee (N. Wales) is safe?
No. Event duration data does not measure bacteria, chemicals or current water quality. Use official local water-quality advice for that question.