Corporation Street Rochester No 2 CSO - 108620
Storm overflow operated by Southern Water. The source names Tidal Estaury of River Medway as the receiving water.
- 21
- Spills in 2025
- 296.3
- Recorded hours
- 68.8%
- Monitor operation
- 5
- Years listed
Checking the latest monitor report…
How it compares in 2025
Corporation Street Rochester No 2 CSO - 108620 recorded 21 spills in 2025. That is more than 64% of the 14,239 overflows in England with a reported figure, and ranks 4,856th nationally. Among Southern Water overflows it ranks 260th of 975; the median Southern Water overflow recorded 7 spills. On the Medway waterbody it ranks 11th of 86.
The monitor worked for 68.8% of 2025, so this count may be low and its rank may understate activity.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 21 | 296.3 |
| England | 4,856th of 14,239 | 11 | 22.3 |
| Southern Water | 260th of 975 | 7 | 17 |
| Medway | 11th of 86 | 4 | 2.3 |
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 | 21 | 296.3 hours | 68.8%Low coverage | Official data |
| 2024 | 0 | 0 hours | 23.7%Low coverage | Official data |
| 2023 | 26 | 461.2 hours | 76.2%Low coverage | Official data |
| 2022 | Unknown | Unknown | 0%Low coverage | Official data |
| 2021 | 0 | 0 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
- A00967
- Activity reference
- Storm
- Grid reference
- TQ7480068270
- Waterbody ID
- GB530604002300Official 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 1.5 km south-east of the Rochester 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
- Furrells Road Rochester CSO - 100071Current status unknown
Southern Water · River Medway Estuary
- High Street Rochester CSO - 108877Current status unknown
Southern Water · River Medway Estuary
- Corporation Street Rochester No 1 CSO - 108619Current status unknown
Southern Water · River Medway Estuary
- Northgate Rochester CSO - 108692Current status unknown
Southern Water · Tidal Estuary of River Medway
Questions about Corporation Street Rochester No 2 CSO - 108620
- Who operates Corporation Street Rochester No 2 CSO - 108620?
- Southern Water is the operator named in the annual record. The permit reference is A00967.
- Where does Corporation Street Rochester No 2 CSO - 108620 discharge?
- The source names Tidal Estaury of River Medway as the receiving water. This does not show how far a discharge travelled.
- How many times did Corporation Street Rochester No 2 CSO - 108620 spill in 2025?
- The 2025 return records 21 counted spill events and 296.3 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 68.8% of the reporting period. Below 90%, some events can be missed, so the count and hours may understate activity.
- Is Corporation Street Rochester No 2 CSO - 108620 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 Corporation Street Rochester No 2 CSO - 108620?
- 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 Corporation Street Rochester No 2 CSO - 108620 compare with other overflows?
- Corporation Street Rochester No 2 CSO - 108620 recorded 21 spills in 2025. That is more than 64% of the 14,239 overflows in England with a reported figure, and ranks 4,856th nationally. Among Southern Water overflows it ranks 260th of 975; the median Southern Water overflow recorded 7 spills. On the Medway waterbody it ranks 11th of 86. 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.