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Salisbury - 2025 Sewage

Polluted by sewage 13,070 hours in 2025 - That's 1.51 years , monitoring offline 2,760 hours , potential overflows 2,538 hours

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Contains OS Data © Crown copyright & database right 2021-2024
© Top of the Poops 2021-2024

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✔ means we have live data (𝑥 if not)

View Annual Sewage Data

You're looking at the totals that we have calculated for sewage in Salisbury for 2025. It is an estimate, based on very poor quality live data from the Water Companies. This may not align with the 'official' reported sewage values from the water companies, which is reported in April following then end of the year - so 2025 numbers are reported in April 2026.

What's a potential overflow? If the CSO goes 'Offline' while its Overflowing, we don't know if it stopped overflowing until we get a 'Stop' event.

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Constituencies near Salisbury

Daily Data

Jan - 4,134 hours
Feb - 4,444 hours , 1 potential
Mar - 2,437 hours , 169 potential
Apr - 658 hours
May - 491 hours , 15 potential
Jun - 42 hours , 0 offline
Jul - 52 hours , 5 offline
Aug - 2 hours
Sept - 19 hours , 638 potential
Oct - 20 hours , 744 potential
Nov - 107 hours , 720 potential
Dec - 657 hours , 249 potential
Daily data is experimental and data is not guaranteed to be accurate. Please inform us of any issue, we will fix.
Please note: We don't have rainfall data for Wales. If you know where to source it please let us know!
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Totals so far

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Offline/Potential Pollution
Wessex Water HURDCOTT STORM TANK River Bourne 152 3,185 h 13m 17 h
Wessex Water ALLINGTON OLD INN River Bourne 85 1,939 h 40m -
Wessex Water BARFORD ST MARTIN BURCOMBE STORM TANK River Nadder 78 1,551 h 55m 0 h
Wessex Water HANGING LANGFORD River Wylye Via A Reed Bed 80 1,504 h 18m 240 h
Wessex Water FOVANT STORM TANK Fovant Brook 52 936 h 19m 0 h
Southern Water EAST GRIMSTEAD SSO - 115851 Groundwater/River Dun 52 847 h 55m 2,351 h
Wessex Water SALISBURY PETERSFINGER SOUTHAMPTON ROAD STORM TANK River Avon 49 836 h 41m -
Southern Water REDLYNCH SSO - 115737 River Blackwater 37 687 h 45m -
Wessex Water Unknown Unknown 34 420 h 29m -
Wessex Water FOVANT STORM TANK Fovant Brook 27 333 h 20m -
Wessex Water DOWNTON MOOT LANE STORM TANK Hampshire Avon, River 19 316 h 52m -
Wessex Water DOWNTON MOOT LANE STORM TANK Hampshire Avon, River 11 97 h 46m -
Wessex Water CHILMARK River Nadder 6 87 h 34m -
Wessex Water HINDON INLET Groundwater Via Infilt System 42 69 h 51m -
Wessex Water HURDCOTT STORM TANK River Bourne 15 59 h 34m -
Wessex Water TISBURY NADDER CLOSE PLAYING FIELDS River Nadder Via Sws 18 54 h 23m -
Wessex Water BARFORD ST MARTIN River Nadder 4 41 h 31m -
Wessex Water HINDON INLET Groundwater Via Infilt System 12 21 h 58m -
Wessex Water SEMLEY INLET River Sem 10 21 h 35m -
Wessex Water SEMLEY INLET River Sem 8 16 h 16m -
Wessex Water TISBURY NADDER CLOSE PLAYING FIELDS River Nadder Via Sws 8 13 h 52m -
Wessex Water SALISBURY BRIDGE STREET/HIGH STREET River Avon Via Sw Sewer 6 7 h 18m -
Wessex Water SALISBURY PETERSFINGER SOUTHAMPTON ROAD STORM TANK River Avon 1 5 h 17m -
Wessex Water SALISBURY ENDLESS LANE/SCOTS LANE River Avon Via Sws 5 3 h 9m -
Wessex Water SALISBURY BRIDGE STREET/HIGH STREET River Avon Via Sw Sewer 3 2 h 34m -
Wessex Water BARFORD ST MARTIN BURCOMBE STORM TANK River Nadder 1 1 h 38m -
Wessex Water HINDON THE DENE River Nadder 2 1 h 30m -
Wessex Water HURDCOTT River Bourne 3 1 h 22m 532 h
Wessex Water SALISBURY ENDLESS LANE/SCOTS LANE River Avon Via Sws 2 1 h 10m -
Wessex Water Unknown Unknown 2 1 h 7m -
Wessex Water HINDON THE DENE River Nadder 1 0 h 14m -
Wessex Water SALISBURY COLLEGE STREET NO XX River Avon Via Sws 1 0 h 8m -
Wessex Water SALISBURY COLLEGE STREET NO XX River Avon Via Sws 1 0 h 8m -
Southern Water REDLYNCH SSO - 115737 River Blackwater 0 0 h -
Wessex Water ALLINGTON OLD INN River Bourne 0 0 h -
Wessex Water Unknown Unknown 0 0 h -
Wessex Water HURDCOTT River Bourne 0 0 h -
Wessex Water HANGING LANGFORD River Wylye Via A Reed Bed 0 0 h -
Southern Water EAST GRIMSTEAD SSO - 115851 Groundwater/River Dun 0 0 h 2,128 h
Wessex Water SALISBURY CHURCHILL GARDENS NEAR COLLEGE River Avon 0 0 h -
Wessex Water CHILMARK River Nadder 0 0 h -
Wessex Water IDMISTON River Bourne 0 0 h 27 h
Wessex Water SALISBURY CHURCHILL GARDENS NEAR COLLEGE River Avon 0 0 h -
Wessex Water IDMISTON River Bourne 0 0 h -
Wessex Water BARFORD ST MARTIN River Nadder 0 0 h -

Data Sources & Accuracy

EDM (Event Duration Monitoring) data and Consented Discharges to Controlled Waters with Conditions from Environment Agency & Data Map Wales, and Scottish Water

Experimental derived data from Thames Water API, Some data may be missing or inaccurate. Live sewage data from Stream Water API

Uses Environment Agency rainfall data from the real-time data API (Beta) - Rainfall data is delayed by up to two days.

This website is intended to provide an accurate representation of the Environment Agency data. The data is hard to use, and thus some errors may have been made. If you find something that is incorrect, please raise an issue at the GitHub issues page and we'll endeavour to fix it quickly.

This project is not associated, approved or endorsed by any of the companies whose logos you see here.

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Analysing sewage pollution by the Water Industry

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© Openstreetmap contributors, Contains OS data © Crown copyright and database right 2021-2025,
Contains Water UK National Storm Overflow Hub Data CC-BY-SA 4.0 and analysis © 2025 Top-Of-The-Poops

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