Low level XX, grosvenor ditch, millb
Storm overflow operated by Thames Water. The source names Tidal Thames as the receiving water.
- 22
- Spills in 2025
- 37.3
- Recorded hours
- 94%
- Monitor operation
- 3
- Years listed
Checking the latest monitor report…
How it compares in 2025
Low level XX, grosvenor ditch, millb recorded 22 spills in 2025. That is more than 65% of the 14,239 overflows in England with a reported figure, and ranks 4,697th nationally. Among Thames Water overflows it ranks 157th of 579; the median Thames Water overflow recorded 6 spills. On the Thames Middle waterbody it ranks 6th of 71.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 22 | 37.3 |
| England | 4,697th of 14,239 | 11 | 22.3 |
| Thames Water | 157th of 579 | 6 | 20.9 |
| Thames Middle | 6th of 71 | 2 | 2.8 |
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 | 22 | 37.3 hours | 94% | Official data |
| 2024 | 26 | 66.1 hours | 88.5%Low coverage | Official data |
| 2023 | 31 | 67.3 hours | 91.8% | 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
- Thames Water
- Outlet type
- Storm overflow on the sewer network
- Permit
- TEMP.2752
- Activity reference
- 1 activity on permit
- Grid reference
- TQ3027078790
- Waterbody ID
- GB530603911402Official 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 3.1 km south-east of the City of Westminster 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
- Horseferry roadCurrent status unknown
Thames Water · R.THAMES ( Tidal )
- Wood streetCurrent status unknown
Thames Water · R.THAMES ( Tidal )
- Brixton storm relief sewerCurrent status unknown
Thames Water · R.THAMES ( Tidal )
- Brixton and Clapham Storm ReliefCurrent status unknown
Thames Water · River Thames (Tidal)
Questions about Low level XX, grosvenor ditch, millb
- Who operates Low level XX, grosvenor ditch, millb?
- Thames Water is the operator named in the annual record. The permit reference is TEMP.2752.
- Where does Low level XX, grosvenor ditch, millb discharge?
- The source names Tidal Thames as the receiving water. This does not show how far a discharge travelled.
- How many times did Low level XX, grosvenor ditch, millb spill in 2025?
- The 2025 return records 22 counted spill events and 37.3 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 94% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
- Is Low level XX, grosvenor ditch, millb 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 Low level XX, grosvenor ditch, millb?
- 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 Low level XX, grosvenor ditch, millb compare with other overflows?
- Low level XX, grosvenor ditch, millb recorded 22 spills in 2025. That is more than 65% of the 14,239 overflows in England with a reported figure, and ranks 4,697th nationally. Among Thames Water overflows it ranks 157th of 579; the median Thames Water overflow recorded 6 spills. On the Thames Middle waterbody it ranks 6th of 71. 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.