Chester Seahill
Storm overflow operated by Dŵr Cymru Welsh Water. The source names Garden City Drain as the receiving water.
- 11
- Spills in 2025
- 22.8
- Recorded hours
- 99.9%
- Monitor operation
- 5
- Years listed
The reported spill count was 4 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 Seahill recorded 11 spills in 2025. That is more than 49% of the 14,239 overflows in England with a reported figure, and ranks 6,918th nationally. Among Dŵr Cymru Welsh Water overflows it ranks 69th of 122; the median Dŵr Cymru Welsh Water overflow recorded 14.5 spills.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 11 | 22.8 |
| England | 6,918th of 14,239 | 11 | 22.3 |
| Dŵr Cymru Welsh Water | 69th of 122 | 14.5 | 29.3 |
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 | 11 | 22.8 hours | 99.9% | Official data |
| 2024 | 15 | 62.8 hours | 99.9% | Official data |
| 2023 | 14 | 43.8 hours | 100% | Official data |
| 2022 | 4 | 1.8 hours | 100% | Official data |
| 2021 | 9 | 23.3 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 discharge at a pumping station
- Permit
- NPSWQD005510
- Activity reference
- A1
- Grid reference
- SJ3560069649
- Waterbody ID
- GB111067056960Official 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 discharge at pumping station”: storm discharge at a pumping station. The overflow is at a pumping station that moves sewage through the network.
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 0.8 km south-west of the Saughall reference point in the ONS built-up areas data.
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
- Chester Saughall Village The Poplars NraCurrent status unknown
Dŵr Cymru Welsh Water · Tributary of the River Dee
- 72 Cheyney Rd CSO ChesterCurrent status unknown
Dŵr Cymru Welsh Water · Finchetts Gutter
- Chester Parkgate CourtCurrent status unknown
Dŵr Cymru Welsh Water · Bache Brook
- Bache Tanks CSOCurrent status unknown
Dŵr Cymru Welsh Water · Bache Brook
Questions about Chester Seahill
- Who operates Chester Seahill?
- Dŵr Cymru Welsh Water is the operator named in the annual record. The permit reference is NPSWQD005510.
- Where does Chester Seahill discharge?
- The source names Garden City Drain as the receiving water. This does not show how far a discharge travelled.
- How many times did Chester Seahill spill in 2025?
- The 2025 return records 11 counted spill events and 22.8 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 Seahill 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 Seahill?
- The annual return lists the asset type as “Storm discharge at pumping station”, which means storm discharge at a pumping station. The overflow is at a pumping station that moves sewage through the network.
- How does Chester Seahill compare with other overflows?
- Chester Seahill recorded 11 spills in 2025. That is more than 49% of the 14,239 overflows in England with a reported figure, and ranks 6,918th nationally. Among Dŵr Cymru Welsh Water overflows it ranks 69th of 122; the median Dŵr Cymru Welsh Water overflow recorded 14.5 spills. 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.