Sewage Map

MERSEY MOUTH - transitional sewage map and spill data

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

23
Outlet records
628
Spills in 2025
3,098
Recorded hours
18
Linked to a live feed

3 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 MERSEY MOUTH - transitional

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 23 outlets

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  • 3/8 Morningside CSO

    United Utilities · Rimrose Brook, Tributary Rvr Mersey

    Current status unknown
    2025 annual record:2spills0.6hours
  • 51 Moor Lane CSO

    United Utilities · Mersey Estuary

    Current status unknown
    2025 annual record:67spills158hours
  • Anchorsholme PS

    United Utilities · The Irish Sea

    Current status unknown
    2025 annual record:49spills611.7hours
  • Chatsworth Avenue PS

    United Utilities · Irish Sea

    Current status unknown
    2025 annual record:32spills79.5hours
  • College Road/Eshe Road

    United Utilities · River Mersey Estuary

    Current status unknown
    2025 annual record:38spills83.2hours
  • Dibbs Lane CSO

    United Utilities · Mersey Estuary

    Current status unknown
    2025 annual record:9spills3.3hours
  • Gynn Square CSO

    United Utilities · Irish Sea

    Current status unknown
    2025 annual record:0spills0hours
  • Harbord Road Sewage Pumping Station (Site ID 99047 ) (SEF0103)

    United Utilities · River Mersey

    Current status unknown
    2025 annual record:14spills17.9hours
  • Heswall WwTW

    Dŵr Cymru Welsh Water · Estuarial Waters of the River Dee

    Current status unknown
    2025 annual record:22spills205.5hours
  • Manchester Square PS

    United Utilities · Irish Sea

    Current status unknown
    2025 annual record:42spills238.2hours

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
    St Michaels Road/Manor Road CSO

    United Utilities · monitor coverage 79.8%, below 90%

    80spills
  2. 2
    Outside 49 St Andrews Road CSO

    United Utilities

    70spills
  3. 3
    51 Moor Lane CSO

    United Utilities

    67spills
  4. 4
    St Andrew's Road/St Michael's Road CSO

    United Utilities

    58spills
  5. 5
    Anchorsholme PS

    United Utilities

    49spills

Spills over time

The median outlet on MERSEY MOUTH - transitional recorded 22 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. 3 recorded more spills, 14 fewer and 2 the same. Together they went from 826 to 519 spills, a fall of 37%.

Largest rises from 2024 to 2025

YearOutlets with a countTotal spillsMedian per outletEngland median
2025236282211
2024239782719

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 MERSEY MOUTH - transitional

23 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: GB641211630001. The official waterbody record is a source lookup; its classification is not imported here.

All sourcesHow the data worksReport pollution

Questions about MERSEY MOUTH - transitional

Which outlets are linked to MERSEY MOUTH - transitional?
The source links 23 outlet records to waterbody GB641211630001. The link comes from the annual return; it does not model where a discharge travelled.
How many spills were recorded for MERSEY MOUTH - transitional?
23 records report 628 spills in 2025 and 3,098 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 MERSEY MOUTH - transitional?
2 companies operate listed outlets: United Utilities, Dŵr Cymru Welsh Water. Each outlet page names its operator and permit reference.
Which outlets on MERSEY MOUTH - transitional are linked to a live feed?
18 of the 23 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 MERSEY MOUTH - transitional?
3 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 MERSEY MOUTH - transitional is safe?
No. Event duration data does not measure bacteria, chemicals or current water quality. Use official local water-quality advice for that question.