Aldford CSO
Storm overflow operated by Dŵr Cymru Welsh Water. The source names Aldford Brook as the receiving water.
- 54
- Spills in 2025
- 330.3
- Recorded hours
- 99.8%
- Monitor operation
- 5
- Years listed
The reported spill count was 53 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
Aldford CSO recorded 54 spills in 2025. That is more than 89% of the 14,239 overflows in England with a reported figure, and ranks 1,394th nationally. Among Dŵr Cymru Welsh Water overflows it ranks 17th of 122; the median Dŵr Cymru Welsh Water overflow recorded 14.5 spills. On the Aldford Brook waterbody it ranks 2nd of 3.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 54 | 330.3 |
| England | 1,394th of 14,239 | 11 | 22.3 |
| Dŵr Cymru Welsh Water | 17th of 122 | 14.5 | 29.3 |
| Aldford Brook | 2nd of 3 | 54 | 330.3 |
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 | 54 | 330.3 hours | 99.8% | Official data |
| 2024 | 107 | 976.3 hours | 99.8% | Official data |
| 2023 | 99 | 721 hours | 100% | Official data |
| 2022 | 77 | 362.5 hours | 100% | Official data |
| 2021 | 92 | 779.8 hours | 99.8% | 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
- Inlet storm overflow at a wastewater treatment works
- Permit
- CM0115201
- Activity reference
- A2
- Grid reference
- SJ4215659533
- Waterbody ID
- GB111067052120Official 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 “Inlet SO at WwTW”: inlet storm overflow at a wastewater treatment works. The overflow is at the inlet of a treatment works, where wastewater enters the 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 3.1 km north of the Churton 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
- SaightonCurrent status unknown
Dŵr Cymru Welsh Water · Tributary of Powsey Brook
- Chester GreenbankCurrent status unknown
Dŵr Cymru Welsh Water · River Dee
- Chester Marlston-Cum-LacheCurrent status unknown
Dŵr Cymru Welsh Water · Balderton Brook
- Chester Belgrave ParkCurrent status unknown
Dŵr Cymru Welsh Water · River Dee
Questions about Aldford CSO
- Who operates Aldford CSO?
- Dŵr Cymru Welsh Water is the operator named in the annual record. The permit reference is CM0115201.
- Where does Aldford CSO discharge?
- The source names Aldford Brook as the receiving water. This does not show how far a discharge travelled.
- How many times did Aldford CSO spill in 2025?
- The 2025 return records 54 counted spill events and 330.3 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 99.8% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
- Is Aldford CSO 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 Aldford CSO?
- The annual return lists the asset type as “Inlet SO at WwTW”, which means inlet storm overflow at a wastewater treatment works. The overflow is at the inlet of a treatment works, where wastewater enters the works.
- How does Aldford CSO compare with other overflows?
- Aldford CSO recorded 54 spills in 2025. That is more than 89% of the 14,239 overflows in England with a reported figure, and ranks 1,394th nationally. Among Dŵr Cymru Welsh Water overflows it ranks 17th of 122; the median Dŵr Cymru Welsh Water overflow recorded 14.5 spills. On the Aldford Brook waterbody it ranks 2nd of 3. 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.