Calder from Source to Walsden Water sewage map and spill data
5 storm overflows listed in the 2025 annual return name this water. All are operated by Yorkshire Water. Check the latest company report for each outlet below.
- 5
- Outlet records
- 160
- Spills in 2025
- 594
- Recorded hours
- 5
- Linked to a live feed
1 records show monitor operation below 90%. Annual figures describe the whole of 2025, not today.
Outlets on Calder from Source to Walsden Water
Filter by the latest company report. The map follows the filters.
Filters apply to the map and list. Recent stops need a current report and a recorded stop time. They do not show whether water is safe.
Showing 5 of 5 outlets
Open full map- Ashenhurst Road/CSOCurrent status unknown
Yorkshire Water · River Calder
2025 annual record:40spills82.5hours - Burnley Rd Cornholme/CSOCurrent status unknown
Yorkshire Water · River Calder
2025 annual record:16spills68.8hours - Fern Hill/CSOCurrent status unknown
Yorkshire Water · River Calder
2025 annual record:7spills24hours - Fielden Terrace/CSOCurrent status unknown
Yorkshire Water · Oak Hill Clough
2025 annual record:91spills391.8hours - Mitchell Street/CSOCurrent status unknown
Yorkshire Water · River Calder
2025 annual record:6spills27.3hours
No outlets match these filters.
Most recorded spills in 2025
The highest 2025 counts among these outlets. A count is events, not volume or harm. Equal counts share a rank.
- 1Fielden Terrace/CSO91spills
Yorkshire Water
- 2Ashenhurst Road/CSO40spills
Yorkshire Water
- 3Burnley Rd Cornholme/CSO16spills
Yorkshire Water
- 4Fern Hill/CSO7spills
Yorkshire Water · monitor coverage 47.1%, below 90%
- 5Mitchell Street/CSO6spills
Yorkshire Water
Spills over time
The median outlet on Calder from Source to Walsden Water recorded 16 spills in 2025, against 11 across England.
3 outlets have a comparable count for both 2024 and 2025, with the monitor working at least 90% of each year. 0 recorded more spills, 3 fewer and 0 the same. Together they went from 205 to 147 spills, a fall of 28%.
| Year | Outlets with a count | Total spills | Median per outlet | England median |
|---|---|---|---|---|
| 2025 | 5 | 160 | 16 | 11 |
| 2024 | 5 | 223 | 30 | 19 |
| 2023 | 4 | 145 | 39 | 20 |
| 2022 | 5 | 80 | 6 | 13 |
| 2021 | 4 | 73 | 10 | 19 |
| 2020 | 5 | 68 | 6 | 18 |
Earlier returns list fewer of these outlets, so totals are not comparable between years. The median per outlet and the like-for-like change are fairer comparisons. Counts are events, not volume.
All outlet records on Calder from Source to Walsden Water
5 outlet records in alphabetical order. Each link opens the outlet page with its latest report and annual history.
- Ashenhurst Road/CSORiver Calder · 40 spills in 2025
- Burnley Rd Cornholme/CSORiver Calder · 16 spills in 2025
- Fern Hill/CSORiver Calder · 7 spills in 2025
- Fielden Terrace/CSOOak Hill Clough · 91 spills in 2025
- Mitchell Street/CSORiver Calder · 6 spills in 2025
Sources and dates
Outlet locations, waterbody links and spill figures come from the Environment Agency 2025 event duration monitoring annual return. The latest company reports come from each operator’s live feed and carry their own dates. Waterbody ID: GB104027062660. The official waterbody record is a source lookup; its classification is not imported here.
Questions about Calder from Source to Walsden Water
- Which outlets are linked to Calder from Source to Walsden Water?
- The source links 5 outlet records to waterbody GB104027062660. The link comes from the annual return; it does not model where a discharge travelled.
- How many spills were recorded for Calder from Source to Walsden Water?
- 5 records report 160 spills in 2025 and 594 recorded hours. All listed records have a usable count. Outlets can discharge at the same time, so the hours are not the time the whole water was affected.
- Who is responsible for the outlets on Calder from Source to Walsden Water?
- Yorkshire Water operates every listed outlet. Contact the operator or the official pollution service if you see a problem in the water.
- Which outlets on Calder from Source to Walsden Water are linked to a live feed?
- 5 of the 5 records are matched to a monitor in a company live feed. A link does not mean the monitor is working now. Use the status filters above to see the latest report for each outlet, with its date. The rest show annual figures only.
- How complete is the monitoring for Calder from Source to Walsden Water?
- 1 of the listed records have monitor operation below 90% for 2025. Events can be missed when a monitor is not working, so low counts from those outlets may understate activity.
- Does this show if Calder from Source to Walsden Water is safe?
- No. Event duration data does not measure bacteria, chemicals or current water quality. Use official local water-quality advice for that question.