Sewage Map

Dollis Brook and Upper Brent sewage map and spill data

15 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.

15
Outlet records
120
Spills in 2025
238
Recorded hours
15
Linked to a live feed

Annual figures describe the whole of 2025, not today.

Official waterbody record ↗How spills are countedSearch the national map

Outlets on Dollis Brook and Upper Brent

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 15 outlets

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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. 1
    Mays Lane Overflow

    Thames Water

    39spills
  2. 2
    Brentfield gardens XX

    Thames Water

    26spills
  3. 3
    Grampian Gardens CSO

    Thames Water

    18spills
  4. 4
    Fairfield Avenue XX

    Thames Water

    11spills
  5. 5
    XX leeside crescent (formerly brookside road, golders green)

    Thames Water

    8spills

Spills over time

The median outlet on Dollis Brook and Upper Brent recorded 3 spills in 2025, against 11 across England.

14 outlets have a comparable count for both 2024 and 2025, with the monitor working at least 90% of each year. 3 recorded more spills, 8 fewer and 3 the same. Together they went from 171 to 102 spills, a fall of 40%.

Largest rises from 2024 to 2025

YearOutlets with a countTotal spillsMedian per outletEngland median
202515120311
202415174619
2023669920
202222110.513

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 Dollis Brook and Upper Brent

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

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: GB106039022980. The official waterbody record is a source lookup; its classification is not imported here.

All sourcesHow the data worksReport pollution

Questions about Dollis Brook and Upper Brent

Which outlets are linked to Dollis Brook and Upper Brent?
The source links 15 outlet records to waterbody GB106039022980. The link comes from the annual return; it does not model where a discharge travelled.
How many spills were recorded for Dollis Brook and Upper Brent?
15 records report 120 spills in 2025 and 238 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 Dollis Brook and Upper Brent?
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 Dollis Brook and Upper Brent are linked to a live feed?
15 of the 15 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 Dollis Brook and Upper Brent?
Every record with a monitor operation figure shows 90% or more for 2025.
Does this show if Dollis Brook and Upper Brent is safe?
No. Event duration data does not measure bacteria, chemicals or current water quality. Use official local water-quality advice for that question.