Marske Sewage Treatment Works, Northumbrian Water (25/06/1015 · 5 · NWL00856)
Storm overflow operated by Northumbrian Water. The source names North Sea as the receiving water.
- 75
- Spills in 2025
- 531.2
- Recorded hours
- 99.9%
- Monitor operation
- 2
- Years listed
The reported spill count was 32 lower than in 2024. This compares event counts, not discharge volume.
Checking the latest monitor report…
How it compares in 2025
Marske Sewage Treatment Works, Northumbrian Water (25/06/1015 · 5 · NWL00856) recorded 75 spills in 2025. That is more than 95% of the 14,239 overflows in England with a reported figure, and ranks 620th nationally. Among Northumbrian Water overflows it ranks 37th of 1,559; the median Northumbrian Water overflow recorded 11 spills. On the Tees Coastal waterbody it ranks 1st of 32.
| Group | Rank by spills | Median spills | Median hours |
|---|---|---|---|
| This outlet | – | 75 | 531.2 |
| England | 620th of 14,239 | 11 | 22.3 |
| Northumbrian Water | 37th of 1,559 | 11 | 15.6 |
| Tees Coastal | 1st of 32 | 3 | 2.7 |
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 | 75 | 531.2 hours | 99.9% | Official data |
| 2024 | 107 | 784.1 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
- Northumbrian Water
- Outlet type
- Inlet storm overflow at a wastewater treatment works
- Permit
- 25/06/1015
- Activity reference
- 5
- Grid reference
- NZ6405024200
- Waterbody ID
- GB650301500005Official 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 2 km north-east of the Marske-by-the-Sea reference point in the ONS built-up areas data.
Designated bathing waters within 3 km in a straight line:
Distance does not show that water from this outlet reaches a bathing water. Check the official bathing-water profile for its classification and advice.
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
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Northumbrian Water · North Sea
- Oak Road CSOCurrent status unknown
Northumbrian Water · North Sea
- Granville Tce SSOCurrent status unknown
Northumbrian Water · North Sea
- Station Road CSOCurrent status unknown
Northumbrian Water · North Sea
Questions about Marske Sewage Treatment Works, Northumbrian Water (25/06/1015 · 5 · NWL00856)
- Who operates Marske Sewage Treatment Works, Northumbrian Water (25/06/1015 · 5 · NWL00856)?
- Northumbrian Water is the operator named in the annual record. The permit reference is 25/06/1015.
- Where does Marske Sewage Treatment Works, Northumbrian Water (25/06/1015 · 5 · NWL00856) discharge?
- The source names North Sea as the receiving water. This does not show how far a discharge travelled.
- How many times did Marske Sewage Treatment Works, Northumbrian Water (25/06/1015 · 5 · NWL00856) spill in 2025?
- The 2025 return records 75 counted spill events and 531.2 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 99.9% of the reporting period, so the annual figures cover most of the year. They still do not measure discharge volume.
- Is Marske Sewage Treatment Works, Northumbrian Water (25/06/1015 · 5 · NWL00856) 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 Marske Sewage Treatment Works, Northumbrian Water (25/06/1015 · 5 · NWL00856)?
- 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 Marske Sewage Treatment Works, Northumbrian Water (25/06/1015 · 5 · NWL00856) compare with other overflows?
- Marske Sewage Treatment Works, Northumbrian Water (25/06/1015 · 5 · NWL00856) recorded 75 spills in 2025. That is more than 95% of the 14,239 overflows in England with a reported figure, and ranks 620th nationally. Among Northumbrian Water overflows it ranks 37th of 1,559; the median Northumbrian Water overflow recorded 11 spills. On the Tees Coastal waterbody it ranks 1st of 32. 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.