Castle Ashby Arm (Grendon Brook) sewage map and spill data

2 storm overflows listed in the 2025 annual return name this water. All are operated by Anglian Water. Check the latest company report for each outlet below.

2
Outlet records: 21
Spills in 2025: 63
Recorded hours: 2
Linked to a live feed

Annual figures describe the whole of 2025, not today.

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

Outlets on Castle Ashby Arm (Grendon Brook)

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 2 of 2 outlets

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Castle Ashby STW
Anglian Water · unnamed tributary Castle Ashby
Current status unknown
2025 annual record:8spills1.7hours

Denton Tps (Northants)
Anglian Water · Denton Brook
Current status unknown
2025 annual record:13spills61hours

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
Denton Tps (Northants)
Anglian Water
13spills
2
Castle Ashby STW
Anglian Water
8spills

Spills over time

The median outlet on Castle Ashby Arm (Grendon Brook) recorded 10.5 spills in 2025, against 11 across England.

2 outlets have a comparable count for both 2024 and 2025, with the monitor working at least 90% of each year. 0 recorded more spills, 2 fewer and 0 the same. Together they went from 63 to 21 spills, a fall of 67%.

Year	Outlets with a count	Total spills	Median per outlet	England median
2025	2	21	10.5	11
2024	2	63	31.5	19
2023	2	22	11	20
2022	1	8	8	13
2021	1	18	18	19

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 Castle Ashby Arm (Grendon Brook)

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

Castle Ashby STWunnamed tributary Castle Ashby · 8 spills in 2025
Denton Tps (Northants)Denton Brook · 13 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: GB105032045030. The official waterbody record is a source lookup; its classification is not imported here.

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Questions about Castle Ashby Arm (Grendon Brook)

Which outlets are linked to Castle Ashby Arm (Grendon Brook)?: The source links 2 outlet records to waterbody GB105032045030. The link comes from the annual return; it does not model where a discharge travelled.
How many spills were recorded for Castle Ashby Arm (Grendon Brook)?: 2 records report 21 spills in 2025 and 63 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 Castle Ashby Arm (Grendon Brook)?: Anglian Water operates every listed outlet. Contact the operator or the official pollution service if you see a problem in the water.
Which outlets on Castle Ashby Arm (Grendon Brook) are linked to a live feed?: 2 of the 2 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 Castle Ashby Arm (Grendon Brook)?: Every record with a monitor operation figure shows 90% or more for 2025.
Does this show if Castle Ashby Arm (Grendon Brook) is safe?: No. Event duration data does not measure bacteria, chemicals or current water quality. Use official local water-quality advice for that question.