Chester, Dŵr Cymru Welsh Water (CM0017801 · A2 · DCW00024)
Storm overflow operated by Dŵr Cymru Welsh Water. The source names Esturial Waters of the River Dee as the receiving water.
- 26
- Spills in 2025
- 149
- Recorded hours
- 99.9%
- Monitor operation
- 5
- Years listed
The reported spill count was 39 lower than in 2024. This compares event counts, not discharge volume.
We do not have a live report for this outlet. Its annual spill records are shown below.
How it compares in 2025
Chester, Dŵr Cymru Welsh Water (CM0017801 · A2 · DCW00024) recorded 26 spills in 2025. That is more than 70% of the 14,239 overflows in England with a reported figure, and ranks 4,061st nationally. Among Dŵr Cymru Welsh Water overflows it ranks 44th of 122; the median Dŵr Cymru Welsh Water overflow recorded 14.5 spills. On the Dee (N. Wales) waterbody it ranks 7th of 24.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 26 | 149 |
| England | 4,061st of 14,239 | 11 | 22.3 |
| Dŵr Cymru Welsh Water | 44th of 122 | 14.5 | 29.3 |
| Dee (N. Wales) | 7th of 24 | 9 | 14.1 |
Rank 1 has the most spills. Equal counts share a rank. Only overflows with a reported count are ranked. Counts do not measure volume, so a higher rank does not mean more sewage.
Annual spill history
| Year | Spills | Duration | Monitor operation | Source |
|---|---|---|---|---|
| 2025 | 26 | 149 hours | 99.9% | Official data |
| 2024 | 65 | 446.3 hours | 99.9% | Official data |
| 2023 | 67 | 354.8 hours | 100% | Official data |
| 2022 | 49 | 249.5 hours | 100% | Official data |
| 2021 | 78 | 563.5 hours | 100% | Official data |
A missing figure means the source did not provide a usable value. A zero is shown as zero. Monitor operation below 90% can make comparison less reliable.
Outlet details
- Water company
- Dŵr Cymru Welsh Water
- Outlet type
- Storm tank at a wastewater treatment works
- Permit
- CM0017801
- Activity reference
- A2
- Grid reference
- SJ3939066450
- Waterbody ID
- GB531106708200Official waterbody record ↗
- Location source
- Official annual grid reference
- Location precision
- About 1 metres
- Location note
- Unknown
About the name and type
The annual return lists this asset as “Storm tank at WwTW”: storm tank at a wastewater treatment works. The overflow comes from storm storage at a treatment works.
The waterbody link opens the Environment Agency record for the exact ID in the return. It is a source lookup; we do not import its classification.
Where it is
The recorded position is about 3.6 km south of the Moston reference point in the ONS built-up areas data.
Designated bathing waters within 3 km in a straight line:
Distance does not show that water from this outlet reaches a bathing water. Check the official bathing-water profile for its classification and advice.
Area and water pages
Check the official record
Public access to this outlet is unknown. Do not enter restricted land or use this page as a route guide.
Open official source ↗Other outlet records nearby
- ChesterCurrent status unknown
Dŵr Cymru Welsh Water · Esturial Waters of the River Dee
- Chester Crane St Waste Ground Nr ManwebCurrent status unknown
Dŵr Cymru Welsh Water · River Dee
- Chester Curzon Park North No 22Current status unknown
Dŵr Cymru Welsh Water · Tributary of the River Dee
- 50 Mount Pleasant Saltney ChesterCurrent status unknown
Dŵr Cymru Welsh Water · River Dee
Questions about Chester, Dŵr Cymru Welsh Water (CM0017801 · A2 · DCW00024)
- Who operates Chester, Dŵr Cymru Welsh Water (CM0017801 · A2 · DCW00024)?
- Dŵr Cymru Welsh Water is the operator named in the annual record. The permit reference is CM0017801.
- Where does Chester, Dŵr Cymru Welsh Water (CM0017801 · A2 · DCW00024) discharge?
- The source names Esturial Waters of the River Dee as the receiving water. This does not show how far a discharge travelled.
- How many times did Chester, Dŵr Cymru Welsh Water (CM0017801 · A2 · DCW00024) spill in 2025?
- The 2025 return records 26 counted spill events and 149 hours of recorded discharge. Spills are counted with the 12/24-hour method, so this is not a count of every start signal.
- Can I trust the 2025 figures for this outlet?
- The monitor worked for 99.9% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
- Is Chester, Dŵr Cymru Welsh Water (CM0017801 · A2 · DCW00024) discharging right now?
- This record is not matched to a company live feed, so we cannot show a current report. Only the annual figures are available for this outlet.
- How accurate is the map marker?
- The marker comes from the grid reference in the official annual return, which is accurate to about 1 metres. It shows the recorded outlet position, not the extent of any discharge.
- What kind of outlet is Chester, Dŵr Cymru Welsh Water (CM0017801 · A2 · DCW00024)?
- The annual return lists the asset type as “Storm tank at WwTW”, which means storm tank at a wastewater treatment works. The overflow comes from storm storage at a treatment works.
- How does Chester, Dŵr Cymru Welsh Water (CM0017801 · A2 · DCW00024) compare with other overflows?
- Chester, Dŵr Cymru Welsh Water (CM0017801 · A2 · DCW00024) recorded 26 spills in 2025. That is more than 70% of the 14,239 overflows in England with a reported figure, and ranks 4,061st nationally. Among Dŵr Cymru Welsh Water overflows it ranks 44th of 122; the median Dŵr Cymru Welsh Water overflow recorded 14.5 spills. On the Dee (N. Wales) waterbody it ranks 7th of 24. Ranks compare counted spill events only. They do not compare volume or harm.
- Does zero spills mean the water was safe?
- No. A zero means the annual return recorded zero counted spill events for this outlet and year. It is not a water-quality test, and pollution can come from other sources.