River Chald from Source to River Calder sewage map and spill data

14 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.

14
Outlet records: 146
Spills in 2025: 249
Recorded hours: 13
Linked to a live feed

1 records show monitor operation below 90%. Annual figures describe the whole of 2025, not today.

Official waterbody record ↗How spills are counted Search the national map

Outlets on River Chald from Source to River Calder

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 10 of 14 outlets

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Bective Mills/CSO
Yorkshire Water · Alverthorpe Beck
Current status unknown
2025 annual record:37spills68.3hours

Brandy Carr Road 252/CSO
Yorkshire Water · Carr Gate Beck
Current status unknown
2025 annual record:0spills0hours
Brandy Carr Road/No 2 CSO
Yorkshire Water · Foster Ford Beck
Current status unknown
2025 annual record:8spills7.5hours
Carr Gate Beck/No 2 CSO
Yorkshire Water · Carr Gate Beck
Current status unknown
2025 annual record:31spills63.8hours
Clayton Hill/CSO
Yorkshire Water · Culverted Tributary of Chald Beck
Current status unknown
2025 annual record:0spills0hours
Derwent Road/No 2 CSO
Yorkshire Water · Alverthorpe Beck
Current status unknown
2025 annual record:3spills0.8hours
Flanshaw Lane/CSO
Yorkshire Water · Alverthorpe Beck
Current status unknown
2025 annual record:4spills1hours
Flanshaw Road/CSO
Yorkshire Water · Alverthorpe Beck
Current status unknown
2025 annual record:15spills14.3hours
Gawthorpe Main St/CSO
Yorkshire Water · Tributary of Bushy Beck
Current status unknown
2025 annual record:3spills1hours
Haigh Hall/CSO
Yorkshire Water · Hey Beck
Current status unknown
2025 annual record:14spills30.8hours

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.

1
Bective Mills/CSO
Yorkshire Water
37spills
2
Carr Gate Beck/No 2 CSO
Yorkshire Water
31spills
3
Wrenthorpe/CSO
Yorkshire Water
16spills
4
Flanshaw Road/CSO
Yorkshire Water
15spills
4
Wrenthorpe Lane/CSO
Yorkshire Water
15spills

Spills over time

The median outlet on River Chald from Source to River Calder recorded 6 spills in 2025, against 11 across England.

13 outlets have a comparable count for both 2024 and 2025, with the monitor working at least 90% of each year. 3 recorded more spills, 5 fewer and 5 the same. Together they went from 147 to 146 spills, a fall of 1%.

Largest rises from 2024 to 2025

Year	Outlets with a count	Total spills	Median per outlet	England median
2025	14	146	6	11
2024	14	147	8	19
2023	14	193	8	20
2022	14	146	4.5	13
2021	13	174	10	19
2020	11	82	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 River Chald from Source to River Calder

14 outlet records in alphabetical order. Each link opens the outlet page with its latest report and annual history.

Bective Mills/CSOAlverthorpe Beck · 37 spills in 2025
Brandy Carr Road 252/CSOCarr Gate Beck · 0 spills in 2025
Brandy Carr Road/No 2 CSOFoster Ford Beck · 8 spills in 2025
Carr Gate Beck/No 2 CSOCarr Gate Beck · 31 spills in 2025
Clayton Hill/CSOCulverted Tributary of Chald Beck · 0 spills in 2025
Derwent Road/No 2 CSOAlverthorpe Beck · 3 spills in 2025
Flanshaw Lane/CSOAlverthorpe Beck · 4 spills in 2025
Flanshaw Road/CSOAlverthorpe Beck · 15 spills in 2025
Gawthorpe Main St/CSOTributary of Bushy Beck · 3 spills in 2025
Haigh Hall/CSOHey Beck · 14 spills in 2025
New Scarborough/CSOAlverthorpe Beck · 0 spills in 2025
Woodside/CSOCut Beck · 0 spills in 2025
Wrenthorpe Lane/CSOBalne Beck · 15 spills in 2025
Wrenthorpe/CSOBalne Beck · 16 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: GB104027062620. The official waterbody record is a source lookup; its classification is not imported here.

All sources How the data works Report pollution

Questions about River Chald from Source to River Calder

Which outlets are linked to River Chald from Source to River Calder?: The source links 14 outlet records to waterbody GB104027062620. The link comes from the annual return; it does not model where a discharge travelled.
How many spills were recorded for River Chald from Source to River Calder?: 14 records report 146 spills in 2025 and 249 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 River Chald from Source to River Calder?: 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 River Chald from Source to River Calder are linked to a live feed?: 13 of the 14 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 River Chald from Source to River Calder?: 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 River Chald from Source to River Calder is safe?: No. Event duration data does not measure bacteria, chemicals or current water quality. Use official local water-quality advice for that question.