Ash (from confluence with Bury Green Brook to Lee) sewage map and spill data

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

2
Outlet records: 15
Spills in 2025: 117
Recorded hours: 2
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 Ash (from confluence with Bury Green Brook to Lee)

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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Hadham Mill (Much Hadham) SPS
Thames Water · River Ash
Current status unknown
2025 annual record:4spills40.8hours

Widford STW
Thames Water · The River Ash
Current status unknown
2025 annual record:11spills76.5hours

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
Widford STW
Thames Water
11spills
2
Hadham Mill (Much Hadham) SPS
Thames Water · monitor coverage 82%, below 90%
4spills

Spills over time

The median outlet on Ash (from confluence with Bury Green Brook to Lee) recorded 7.5 spills in 2025, against 11 across England.

1 outlet has a comparable count for both 2024 and 2025, with the monitor working at least 90% of each year. 1 recorded more spills, 0 fewer and 0 the same. Together it went from 10 to 11 spills, a rise of 10%.

Largest rises from 2024 to 2025

Widford STW10 → 11

Year	Outlets with a count	Total spills	Median per outlet	England median
2025	2	15	7.5	11
2024	2	45	22.5	19
2023	2	45	22.5	20
2022	1	8	8	13
2021	1	12	12	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 Ash (from confluence with Bury Green Brook to Lee)

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

Hadham Mill (Much Hadham) SPSRiver Ash · 4 spills in 2025
Widford STWThe River Ash · 11 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: GB106038033290. The official waterbody record is a source lookup; its classification is not imported here.

All sources How the data works Report pollution

Questions about Ash (from confluence with Bury Green Brook to Lee)

Which outlets are linked to Ash (from confluence with Bury Green Brook to Lee)?: The source links 2 outlet records to waterbody GB106038033290. The link comes from the annual return; it does not model where a discharge travelled.
How many spills were recorded for Ash (from confluence with Bury Green Brook to Lee)?: 2 records report 15 spills in 2025 and 117 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 Ash (from confluence with Bury Green Brook to Lee)?: Thames Water operates every listed outlet. Contact the operator or the official pollution service if you see a problem in the water.
Which outlets on Ash (from confluence with Bury Green Brook to Lee) 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 Ash (from confluence with Bury Green Brook to Lee)?: 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 Ash (from confluence with Bury Green Brook to Lee) is safe?: No. Event duration data does not measure bacteria, chemicals or current water quality. Use official local water-quality advice for that question.