Dinnington STW (SSO)
Storm overflow operated by Severn Trent Water. The source names Cramfit Brook as the receiving water.
- 41
- Spills in 2025
- 403.2
- Recorded hours
- 99.7%
- Monitor operation
- 6
- Years listed
Checking the latest monitor report…
How it compares in 2025
Dinnington STW (SSO) recorded 41 spills in 2025. That is more than 83% of the 14,239 overflows in England with a reported figure, and ranks 2,313th nationally. Among Severn Trent Water overflows it ranks 228th of 2,431; the median Severn Trent Water overflow recorded 8 spills. On the Anston Brook from Source to Ryton waterbody it ranks 1st of 4.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 41 | 403.2 |
| England | 2,313th of 14,239 | 11 | 22.3 |
| Severn Trent Water | 228th of 2,431 | 8 | 16.2 |
| Anston Brook from Source to Ryton | 1st of 4 | 22.5 | 120.6 |
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 | 41 | 403.2 hours | 99.7% | Official data |
| 2024 | 172 | 1,380.9 hours | 58.5%Low coverage | Official data |
| 2023 | 80 | 807.5 hours | 71.4%Low coverage | Official data |
| 2022 | 83 | 471 hours | 95.5% | Official data |
| 2021 | 54 | 627.2 hours | 70.2%Low coverage | Official data |
| 2020 | 17 | 210.8 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
- Severn Trent Water
- Outlet type
- Inlet storm overflow at a wastewater treatment works
- Permit
- T/75/46295/R
- Activity reference
- A3
- Grid reference
- SK5152485980
- Waterbody ID
- GB104028058210Official 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 1.1 km west of the Dinnington (Rotherham) 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
- Dinnington STW SSTO 1 (SSTO)Current status unknown
Severn Trent Water · Cramfit Brook
- North Anston - Ryton Road PS (CSO)Current status unknown
Severn Trent Water · Anston Brook
- Anston - Rackford Road (SSTO)Current status unknown
Severn Trent Water · Anston Brook
- Slade Hooton STW (SSTO)Current status unknown
Severn Trent Water · Hooton Dike
Questions about Dinnington STW (SSO)
- Who operates Dinnington STW (SSO)?
- Severn Trent Water is the operator named in the annual record. The permit reference is T/75/46295/R.
- Where does Dinnington STW (SSO) discharge?
- The source names Cramfit Brook as the receiving water. This does not show how far a discharge travelled.
- How many times did Dinnington STW (SSO) spill in 2025?
- The 2025 return records 41 counted spill events and 403.2 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 99.7% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
- Is Dinnington STW (SSO) 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 Dinnington STW (SSO)?
- 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 Dinnington STW (SSO) compare with other overflows?
- Dinnington STW (SSO) recorded 41 spills in 2025. That is more than 83% of the 14,239 overflows in England with a reported figure, and ranks 2,313th nationally. Among Severn Trent Water overflows it ranks 228th of 2,431; the median Severn Trent Water overflow recorded 8 spills. On the Anston Brook from Source to Ryton waterbody it ranks 1st of 4. 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.