Sewage Map

Dŵr Cymru Welsh Water sewage map and spill data

Dŵr Cymru Welsh Water operates 122 storm overflows listed in the 2025 England annual return, on 54 named receiving waters. Check the latest company report for each outlet below.

122
Outlet records
2,843
Spills in 2025
14,525
Recorded hours
0
Linked to a live feed

5 records show monitor operation below 90%. Annual figures describe the whole of 2025, not today. Company totals are not a league table.

Waters with the most Dŵr Cymru Welsh Water outlets

Receiving waters named in the annual return, with the number of this company’s outlets on each.

Official annual data ↗Dŵr Cymru Welsh Water 2025 reportHow spills are countedReport pollution

Dŵr Cymru Welsh Water outlets

Filter by the latest company report, or search by outlet, receiving water, town or postcode. 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 122 outlets

Open full map
  • 50 Mount Pleasant Saltney Chester

    Dŵr Cymru Welsh Water · River Dee

    Current status unknown
    2025 annual record:57spills94.3hours
  • 72 Cheyney Rd CSO Chester

    Dŵr Cymru Welsh Water · Finchetts Gutter

    Current status unknown
    2025 annual record:4spills2.5hours
  • Aldford CSO

    Dŵr Cymru Welsh Water · Aldford Brook

    Current status unknown
    2025 annual record:54spills330.3hours
  • Bache Tanks CSO

    Dŵr Cymru Welsh Water · Bache Brook

    Current status unknown
    2025 annual record:0spills0hours
  • Barton Road CSO, Hereford

    Dŵr Cymru Welsh Water · Yazor Brook

    Current status unknown
    2025 annual record:6spills4hours
  • Bromyard

    Dŵr Cymru Welsh Water · River Frome

    Current status unknown
    2025 annual record:4spills6.3hours
  • Bromyard Petty Bridge

    Dŵr Cymru Welsh Water · River Frome

    Current status unknown
    2025 annual record:60spills96.5hours
  • Bromyard Sherford Street

    Dŵr Cymru Welsh Water · River Frome

    Current status unknown
    2025 annual record:45spills51.5hours
  • Cannop Road (Nr Forest Of Dean)

    Dŵr Cymru Welsh Water · Cannop Brook

    Current status unknown
    2025 annual record:7spills7.8hours
  • Cedar Way CSO

    Dŵr Cymru Welsh Water · River Dee

    Current status unknown
    2025 annual record:0spills0hours

Most recorded spills in 2025

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

  1. 1
    St Briavels WwTW

    Wye Estuary

    136spills
  2. 2
    Shobdon

    Pinsley Brook

    122spills
  3. 3
    Neston Parkgate

    Dee Estuary

    85spills
  4. 4
    Greenfield Halls Factory Yard Nra

    Greenfield Valley "Holywell" stream

    80spills
  5. 5
    Chester The Dingle Manhole 1405

    Tributary of the River Dee

    66spills

Spills over time

The median outlet run by Dŵr Cymru Welsh Water recorded 14.5 spills in 2025, against 11 across England.

100 outlets have a comparable count for both 2024 and 2025, with the monitor working at least 90% of each year. 6 recorded more spills, 89 fewer and 5 the same. Together they went from 4,568 to 2,414 spills, a fall of 47%.

Largest rises from 2024 to 2025

YearOutlets with a countTotal spillsMedian per outletEngland median
20251222,84314.511
20241195,0293119
2023261,47358.520
2022269383513
2021231,0394719

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 Dŵr Cymru Welsh Water outlet records

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

A1 outlet
B5 outlets
C30 outlets
E2 outlets
F1 outlet
G3 outlets
H16 outlets
J1 outlet
K4 outlets
L5 outlets
M6 outlets
N11 outlets
P6 outlets
R6 outlets
S8 outlets
T4 outlets
W13 outlets

Sources and dates

Outlet locations, receiving waters and spill figures come from the Environment Agency 2025 event duration monitoring annual return for England. The latest reports come from the Dŵr Cymru Welsh Water live feed and carry their own dates. Only this company’s records in the England return are shown, so this is not a full picture of Wales.

All sourcesCoverage and gapsHow the data works

Questions about Dŵr Cymru Welsh Water

What do the Dŵr Cymru Welsh Water figures cover?
This page totals 122 outlet records with a usable 2025 spill count, out of 122 records in the England dataset. Missing values are not counted as zero.
How many Dŵr Cymru Welsh Water outlets are linked to a live feed?
None of these records is matched to a company live feed, so only annual figures are available.
How many Dŵr Cymru Welsh Water outlets recorded zero spills in 2025?
9 records report zero counted spills. 5 records have monitor operation below 90%, so a zero from one of those outlets may not cover the whole year.
Does a recorded spill show how much sewage was discharged?
No. Event duration monitors report when an overflow operated. They do not measure the volume released or the water quality.
Can I compare Dŵr Cymru Welsh Water with another company?
Take care. 5 records have monitor operation below 90%, and companies differ in outlet numbers and area. Check missing values and monitor coverage before making a comparison.
How do I report pollution from a Dŵr Cymru Welsh Water outlet?
Use the official pollution reporting route in our guide. Give the outlet name, permit reference and the time you saw the problem. Sewage Map does not send incident reports.