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Scottish Water storm overflows

2,073 storm overflows · 2,073 with a live status feed · regulated by SEPA.

Discharging now
88
of 2,073 overflows reporting live
Events in 2025
99,175
official, from 1,273 monitored overflows
Hours in 2025
272k
total discharge time, 213 h per overflow
Average per overflow
77.9
events each in 2025 · -12% on 2024 (88.8)

Discharging now longest-running 15 of 88

From Scottish Water's live monitor feed, longest-running first.

Eochar 1 Wwps CSO 1997 Nf781462 Un-named Drain Into Loch Dun Na Buail-uachdraich
24 d 9 hsince 6 Sep, 03:40
Kilbirnie, Fudstone SPS CSO Paduff Burn
5 d 1 hsince 25 Sep, 11:45
Strathblane WwTW - (Old) Ssso Blane Water
3 d 3 hsince 27 Sep, 09:45
Whiting Bay CSO/EO 1 2011 Ns049273 Whiting Bay
12 h 20 minsince 30 Sep, 01:10
Ardnadam CSO 2010 Ns164803 Holy Loch
12 h 0 minsince 30 Sep, 01:30
Port Ellen SPS 4 CSO 2005 Nr359457 Loch Leodamis
11 h 15 minsince 30 Sep, 02:15
Glentrool WwTW Ssso Black Burn
11 h 5 minsince 30 Sep, 02:25
Lochgilphead Front Green CSO 08 Nr863879 Loch Gilp
10 h 30 minsince 30 Sep, 03:00
Dumbarton Bankend Wwps CSO/EO Ns398758 River Leven
10 h 25 minsince 30 Sep, 03:05
Port Bannatyne CSO 1 2011 Ns070673 Kames Bay
10 h 20 minsince 30 Sep, 03:10
Ardrishaig Wwps 2 CSO 2005 Nr852858 Loch Gilp
10 h 15 minsince 30 Sep, 03:15
Port Charlotte SPS No2 CSO Loch Indaal
9 h 53 minsince 30 Sep, 03:36
Salen Septic Tank CSO Sound Of Mull
9 h 46 minsince 30 Sep, 03:44
Clachan Balvicar WwTW CSO 2009 Nm771177 Seil Sound
9 h 45 minsince 30 Sep, 03:45
Patna WwTW CSO River Doon
9 h 5 minsince 30 Sep, 04:25

Year by year

Overflow events reported across all of Scottish Water's monitored overflows.

2021126 sites
10,092 events · 116k h
2022229 sites
18,138 events · 178k h
2023258 sites
23,618 events · 228k h
2024264 sites
23,450 events · 201k h
20251,273 sites
99,175 events · 272k h

More overflows were monitored each year (126 in 2021, 1,273 in 2025), so part of any rise is more monitors, not only more spilling.

Scottish Water counts each overflow event; England and Wales count 12/24-hour "spills", so these numbers are not comparable with English or Welsh companies. Overflows whose monitor produced no usable data in a year are left out of that year — not counted as zero (192 in 2025).

Most events in 2025

The overflows that reported the most overflow events. A red tag means discharging right now.

1
Rockcliffe WwTW Ssso Barcloy Mill Burn
3,489572 h
2
West Barns, West Barns SPS CSO Firth Of Forth
3,2991,060 h
3
Ferniegair WwTW Ssso And EO River Clyde
2,720538 h
4
Longridge, Longridge CSO Breich Water
2,645512 h
5
St Boswells WwTW SssoNow River Tweed
2,3961,536 h
6
Dalkeith, Gilmerton Rd/Elginhaugh CSO River North Esk
2,255581 h
7
Renfrew SPS CSO Clyde Estuary
1,7343,066 h
8
Helensburgh WwTW - Post-Pst SssoNow Clyde Estuary
1,6976,932 h
9
Lockerbie WwTW- Pre-Filter (3dwf) Ssso Un-named Tributary Of Kirk Burn
1,5221,934 h
10
Broadford Liveras Pk (Ssso) CSO Ng641237 Broadford River
1,323502 h
11
Cumnock, Lugar SPS CSO Lugar Water
1,288579 h
12
Greengairs WwTW SssoNow Cameron Burn
1,1561,882 h
13
Fauldhouse, 29 Greenburn Road CSO Tributary Of Briech Water
1,1551,360 h
14
Eaglesfield WwTW (29m3) SssoNow Kirtle Water
9432,942 h
15
Gattonside, Chainbridge CSO River Tweed
8941,601 h
16
Bo'ness WwTW Ssso Forth Estuary
885679 h
17
Duns WwTW Ssso Blackadder Water
875976 h
18
Eastriggs WwTW Ssso And EO Solway Firth
7951,132 h
19
Stornoway Ssso CSO Nb445308 The Minch
6372,595 h
20
Methven WwTW Ssso East Pow
623261 h
21
Mauchline WwTW-Treated 1.5dwf Ssso River Ayr
6172,787 h
22
Fortrose Academy CSO 2 Nh731563 Moray Firth
5841,381 h
23
Lochcarron WwTW Ssso CSO Nh882375 Loch Carron
5681,404 h
24
Kilsyth, 130m Nw Of STW Entrance CSO Dock Water
563453 h
25
Peterhead WwTW - 3dwf Long Outfall CSO North Sea
5591,044 h

Rivers and seas it discharges into most

Events in 2025 from Scottish Water's overflows, by receiving water (names grouped approximately).

1
River Clyde 41 overflows
6,03115k h
2
Firth Of Forth 67 overflows
5,7558,370 h
3
Clyde Estuary 22 overflows
5,51425k h
4
River Tweed 30 overflows
5,0399,486 h
5
Barcloy Mill Burn 1 overflow
3,489572 h
6
Breich Water 5 overflows
2,814753 h
7
North Sea 33 overflows
2,3765,058 h
8
River North Esk 7 overflows
2,333792 h
9
Firth Of Clyde 34 overflows
2,2357,103 h
10
Un-named Tributary Of Kirk Burn 3 overflows
1,6652,377 h

Concerned about an overflow?

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

Complain to Scottish Water ↗ Report pollution ↗ All companies & rankings

Live status: © Scottish Water, near-real-time Overflow Map data, open licence for reuse. EDM monitors indicate overflows; they do not confirm them, and this is not advice on water quality. Annual figures: Scottish Water overflow event data, Open Government Licence. 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.