Tonge Valley CSO
Storm overflow operated by United Utilities. The source names River Tonge as the receiving water.
- 0
- Spills in 2025
- 0
- Recorded hours
- 77.1%
- Monitor operation
- 2
- Years listed
Checking the latest monitor report…
How it compares in 2025
Tonge Valley CSO recorded no spills in 2025. It is one of 2,231 overflows in England with a reported count of zero, out of 14,239 with a count.
The monitor worked for 77.1% of 2025, so this count may be low and its rank may understate activity.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 0 | 0 |
| England | 12,009th of 14,239 | 11 | 22.3 |
| United Utilities | 1,976th of 2,270 | 15 | 29.1 |
| Tonge | 9th of 11 | 18 | 21.9 |
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 | 0 | 0 hours | 77.1%Low coverage | Official data |
| 2024 | 0 | 0 hours | 16.4%Low coverage | 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
- United Utilities
- Outlet type
- Storm overflow on the sewer network
- Permit
- 016983223
- Activity reference
- A1
- Grid reference
- SD7208010910
- Waterbody ID
- GB112069064530Official 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 “SO on sewer network”: storm overflow on the sewer network. The return places this overflow on the sewer 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 0.9 km north-east of the Bolton (Bolton) reference point in the ONS built-up areas data.
Area and water pages
- Wardley area →
- Radcliffe area →
- Walkden area →
- Kearsley area →
- Little Hulton area →
- Farnworth area →
- Little Lever area →
- Tyldesley area →
- Westhoughton area →
- Bury (Bury) area →
- Wingates area →
- Atherton area →
- Hunger Hill (Bolton) area →
- Chew Moor area →
- Ainsworth area →
- Horwich area →
- Bolton (Bolton) area →
- Tonge waterbody →
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
- Waters meeting Road CSOCurrent status unknown
United Utilities · River Tonge
- HALL i' th WOOD CSOCurrent status unknown
United Utilities · Eagley Brook
- Astley Bridge Combined Sewer Overflow (Site ID 071WP) (BOL0056)Current status unknown
United Utilities · Astley Brook
- Darley Street CSO (079KL)Current status unknown
United Utilities · River Tonge via a surface water sewer
Questions about Tonge Valley CSO
- Who operates Tonge Valley CSO?
- United Utilities is the operator named in the annual record. The permit reference is 016983223.
- Where does Tonge Valley CSO discharge?
- The source names River Tonge as the receiving water. This does not show how far a discharge travelled.
- How many times did Tonge Valley CSO spill in 2025?
- The 2025 return records 0 counted spill events and 0 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 77.1% of the reporting period. Below 90%, some events can be missed, so the count and hours may understate activity.
- Is Tonge Valley CSO discharging right now?
- This record is linked to a company live feed. The panel above shows the latest report we hold, with its date. That report can be old, and the monitor can be offline, so check the date before relying on it. A report that no discharge is taking place is not a water-quality result.
- 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 Tonge Valley CSO?
- The annual return lists the asset type as “SO on sewer network”, which means storm overflow on the sewer network. The return places this overflow on the sewer network.
- How does Tonge Valley CSO compare with other overflows?
- Tonge Valley CSO recorded no spills in 2025. It is one of 2,231 overflows in England with a reported count of zero, out of 14,239 with a count. 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.