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United Utilities storm overflows

2,244 storm overflows · 2,178 with a live status feed · regulated by the Environment Agency.

Discharging now
6
of 2,140 overflows reporting live
Spills in 2025
60,241
official, from 2,242 monitored overflows
Hours in 2025
325k
total discharge time, 145 h per overflow
Average per overflow
26.9
spills each in 2025 · -23% on 2024 (34.7)

Discharging now

From United Utilities's live monitor feed, longest-running first.

Longton Wastewater Treatment Works Tarra Carr Gutter
6 h 5 minsince 30 Sep, 07:24
Barton Waste Water Treatment Works Barton Brook
5 h 54 minsince 30 Sep, 07:35
Bromborough WwTW River Mersey Estuary
5 h 49 minsince 30 Sep, 07:40
Birkenhead WwTW Birke River Mersey Estuary/r.birket
5 h 9 minsince 30 Sep, 08:20
Eccleston Bridge CSO 12065 River Yarrow
4 h 37 minsince 30 Sep, 08:52
Pimhole CSO Barn Brook
4 h 29 minsince 30 Sep, 09:00

Year by year

Spills reported across all of United Utilities's monitored overflows.

20211,772 sites
72,372 spills · 453k h
20221,749 sites
58,215 spills · 335k h
20231,979 sites
86,380 spills · 555k h
20242,244 sites
77,817 spills · 451k h
20252,242 sites
60,241 spills · 325k h

More overflows were monitored each year (1,772 in 2021, 2,242 in 2025), so part of any rise is more monitors, not only more spilling.

Official Environment Agency Event Duration Monitoring returns, 12/24-hour counting method (the first 12 hours of a discharge count as one spill, each further 24 hours as one more). Earlier years are matched to today's overflows by name and location, because the EA's site IDs changed between returns; a site that could not be matched is left out of that year rather than guessed.

Most spills in 2025

The overflows that spilled most often. A red tag means discharging right now.

1
Lock Lane Partington CSO Manchester Ship Canal
2171,574 h
2
Blennerhasset Ww Pumping Station River Ellen
1722,508 h
3
Braystones WwTW Irish Sea
1681,082 h
4
Staveley WwTW River Kent
1673,395 h
5
North Wirral WwTW Liverpool Bay & River Birket
164833 h
6
Plumbland WwTW River Ellen
1641,928 h
7
Wallasey Ww Pumping Station River Mersey Estuary
164769 h
8
Great Broughton WwTW River Derwent
1611,427 h
9
Crosby Garret WwTW Crosby Garrett Beck
1591,922 h
10
Pica STW Dyan Beck
1522,589 h
11
Barton Waste Water Treatment WorksNow Barton Brook
1472,207 h
12
Keekle Pumping Station River Keekle
1471,533 h
13
Dean Village Ww Pumping Station Near Stock Beck
1451,611 h
14
Sharples Street CSO Tributary Of River Darwen
145381 h
15
Waddington WwTW Bashall Brook
1451,935 h
16
Ingleton STW River Greta
1442,446 h
17
Hurst Green WwTW Dean Brook
1431,364 h
18
Winton Pumping Station River Eden
1401,427 h
19
Abbey Rd/Hollow Lane CSO Millbeck
139682 h
20
Gleaston Castle CSO Gleaston Beck
1393,206 h
21
The Glen Combined Sewer Overflow River Irwell
1391,306 h
22
Bolton Low Houses STW River Waver
1351,379 h
23
Eaglesfield WwTW Eagle Dubbs Gutter
1341,214 h
24
Over Kellet WwTW Trib River Keer
1342,402 h
25
Cockermouth WwTW River Derwent
1332,354 h

Rivers and seas it discharges into most

Spills in 2025 from United Utilities's overflows, by receiving water (names grouped approximately).

1
River Irwell 80 overflows
2,1299,733 h
2
River Mersey 51 overflows
1,7257,413 h
3
The River Tame 56 overflows
1,7218,785 h
4
River Mersey Estuary 28 overflows
1,2346,861 h
5
River Eden 30 overflows
1,0186,261 h
6
Manchester Ship Canal 39 overflows
9483,882 h
7
River Derwent 14 overflows
9148,743 h
8
River Calder 21 overflows
8725,822 h
9
The River Goyt 27 overflows
7974,306 h
10
River Roch 24 overflows
7693,431 h

Concerned about an overflow?

Report pollution you can see to the Environment Agency on 0800 80 70 60 — they log and investigate incidents. Complaints about a company's service go to the company first.

Complain to United Utilities ↗ Report pollution ↗ All companies & rankings

Live status: © United Utilities storm overflow activity data, licensed under CC BY 4.0. Annual spill figures: Environment Agency Event Duration Monitoring return, © Environment Agency copyright and/or database right, Open Government Licence (OGL) v3.0. FloodRadar republishes the monitors' status and the published figures; it does not measure discharges itself, and a monitor reports a discharge, not its volume or its cause.