Cobham Street Gravesend CSO - 108609
Storm overflow operated by Southern Water. The source names Tidal River Thames as the receiving water.
- 1
- Spills in 2025
- 1.3
- Recorded hours
- 66.8%
- Monitor operation
- 5
- Years listed
Checking the latest monitor report…
How it compares in 2025
Cobham Street Gravesend CSO - 108609 recorded 1 spill in 2025. That is more than 15% of the 14,239 overflows in England with a reported figure, and ranks 11,130th nationally. Among Southern Water overflows it ranks 718th of 975; the median Southern Water overflow recorded 7 spills. On the Thames Middle waterbody it ranks 44th of 71.
The monitor worked for 66.8% of 2025, so this count may be low and its rank may understate activity.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 1 | 1.3 |
| England | 11,130th of 14,239 | 11 | 22.3 |
| Southern Water | 718th of 975 | 7 | 17 |
| Thames Middle | 44th 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 | 1 | 1.3 hours | 66.8%Low coverage | Official data |
| 2024 | 5 | 8.1 hours | 77.3%Low coverage | Official data |
| 2023 | 5 | 3.9 hours | 99.7% | Official data |
| 2022 | 5 | 3.7 hours | 99.9% | Official data |
| 2021 | 3 | 1.8 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
- Southern Water
- Outlet type
- Storm overflow on the sewer network
- Permit
- CASM.0029
- Activity reference
- Storm
- Grid reference
- TQ6481074520
- 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 1.9 km south of the Tilbury 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
- Cross Lane East Gravesend CSO - 108704Current status unknown
Southern Water · River Thames - Tidal
- Old Road West Gravesend CSO - 108693Current status unknown
Southern Water · Tidal River Thames
- Singlewell Road Gravesend Outside 132 CSO - 108728Current status unknown
Southern Water · Tidal River Thames
- High Street Gravesend Outside 70 CSO - 108651Current status unknown
Southern Water · River Thames Estuary
Questions about Cobham Street Gravesend CSO - 108609
- Who operates Cobham Street Gravesend CSO - 108609?
- Southern Water is the operator named in the annual record. The permit reference is CASM.0029.
- Where does Cobham Street Gravesend CSO - 108609 discharge?
- The source names Tidal River Thames as the receiving water. This does not show how far a discharge travelled.
- How many times did Cobham Street Gravesend CSO - 108609 spill in 2025?
- The 2025 return records 1 counted spill events and 1.3 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 66.8% of the reporting period. Below 90%, some events can be missed, so the count and hours may understate activity.
- Is Cobham Street Gravesend CSO - 108609 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 Cobham Street Gravesend CSO - 108609?
- 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 Cobham Street Gravesend CSO - 108609 compare with other overflows?
- Cobham Street Gravesend CSO - 108609 recorded 1 spill in 2025. That is more than 15% of the 14,239 overflows in England with a reported figure, and ranks 11,130th nationally. Among Southern Water overflows it ranks 718th of 975; the median Southern Water overflow recorded 7 spills. On the Thames Middle waterbody it ranks 44th 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.