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Melksham and Devizes - 2025 Sewage

Polluted by sewage 8,558 hours in 2025 , monitoring offline 2,589 hours , potential overflows 1,095 hours

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

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View Annual Sewage Data

You're looking at the totals that we have calculated for sewage in Melksham and Devizes 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 Melksham and Devizes

Daily Data

Jan - 3,612 hours , 0 offline
Feb - 1,931 hours , 8 offline
Mar - 161 hours , 7 offline
Apr - 3 hours
May - 9 hours , 53 offline
Jun - 37 hours , 34 offline
Jul - 44 hours , 21 offline
Aug - 3 hours , 8 offline
Sept - 32 hours , 7 offline
Oct - 23 hours , 190 offline
Nov - 749 hours , 327 potential
Dec - 1,947 hours , 744 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 BROADS GREEN River Marden 33 670h 35m -
Wessex Water SEEND STORM TANK Seend Hill Stream 26 548h 14m -
Wessex Water COATE SPANIELS BRIDGE River Avon 36 467h 39m -
Wessex Water BROADS GREEN River Marden 21 393h 24m -
Wessex Water CALNE ROUGH LEAZE River Marden 19 384h 58m 606 h
Wessex Water WINGFIELD CHURCH LANE Lam Brook Stream 21 332h 57m -
Wessex Water MELKSHAM BATH ROAD OFF ROAD F/O SCOUT HALL Clackers Brook 31 279h 3m -
Wessex Water MELKSHAM INLET River Avon 23 257h 38m -
Wessex Water FRESHFORD STORM TANK Bristol Avon 20 248h 8m -
Wessex Water MELKSHAM INLET River Avon 27 240h 20m -
Wessex Water MELKSHAM BATH ROAD OFF ROAD F/O SCOUT HALL Clackers Brook 22 233h 12m -
Wessex Water BOX MILL LANE STORM TANK By Brook 21 220h 34m -
Wessex Water BOX MILL LANE STORM TANK By Brook 13 215h -
Wessex Water WINGFIELD CHURCH LANE Lam Brook Stream 15 193h 56m -
Wessex Water POULSHOT TOWNSEND Summerham Brook 13 188h 45m -
Wessex Water WESTWOOD STORM TANK River Frome 12 185h 12m 6 h
Wessex Water LAVINGTON WOODBRIDGE STORM TANK Semington Brook 11 169h 25m -
Wessex Water WESTWOOD STORM TANK River Frome 13 166h 32m -
Wessex Water BOWERHILL SHAILS LANE STORM TANK Berryfield Stream 13 162h 42m -
Wessex Water MELKSHAM STORM TANK River Avon 13 162h 40m -
Wessex Water MELKSHAM SHAW C OF E SCHOOL PLAYING FIELD South Brook 24 157h 28m -
Wessex Water BOWERHILL SHAILS LANE STORM TANK Berryfield Stream 16 131h -
Wessex Water FRESHFORD STORM TANK Bristol Avon 9 112h 4m -
Wessex Water WORTON MILL ROAD Semington Brook 8 109h 55m -
Wessex Water MELKSHAM SHAW C OF E SCHOOL PLAYING FIELD South Brook 16 108h 48m -
Wessex Water HORTON HORTON FARM Etchilhampton Water 60 107h 34m 0 h
Wessex Water SOUTH WRAXALL HOME FARM LOWER WRAXALL STORM TANK Chalfield Brook 7 107h 19m -
Wessex Water HOLT THE STAR River Avon 28 100h 18m -
Wessex Water GREAT CHEVERELL CHEVERELL GREEN Semington Brook 7 93h 59m -
Wessex Water BROUGHTON GIFFORD THE GREEN Chalfield Brook 9 90h 17m -
Wessex Water BOX MILL LANE By Brook 24 89h 14m -
Wessex Water BRADFORD-ON-AVON STORM TANK River Avon 7 85h 32m -
Wessex Water MONKTON COMBE MILL LANE Midford Brook 32 83h 55m 16 h
Wessex Water HOLT THE STAR River Avon 18 78h 44m -
Wessex Water BOX MILL LANE By Brook 16 77h 2m -
Wessex Water SOUTH WRAXALL HOME FARM LOWER WRAXALL STORM TANK Chalfield Brook 6 63h 33m -
Wessex Water URCHFONT STORM TANK Semington Brook 5 63h 32m -
Wessex Water DEVIZES WEBBS LANE STORM TANK Waylen Brook 7 62h 28m -
Wessex Water SEMINGTON SEMINGTON BROOK Semington Brook 9 62h 10m -
Wessex Water MELKSHAM STORM TANK River Avon 4 59h 20m 1,095 h
Wessex Water BROUGHTON GIFFORD CURTIS ORCHARD Of Chalfield Brook 5 52h 54m -
Wessex Water COULSTON Semington Brook 8 50h 10m -
Wessex Water POULSHOT TOWNSEND Summerham Brook 7 49h 28m -
Wessex Water Unknown Unknown 7 42h 35m -
Wessex Water BROUGHTON GIFFORD THE GREEN Chalfield Brook 5 41h 26m -
Wessex Water SEEND STORM TANK Seend Hill Stream 4 40h 42m -
Wessex Water MELKSHAM SEMINGTON ROAD O/S POLICE STATION River Avon 14 39h 22m -
Wessex Water BULKINGTON WICKLEAZE Semington Brook 5 38h 6m -
Wessex Water Unknown Unknown 5 32h 27m -
Wessex Water MELKSHAM SEMINGTON ROAD Unknown 4 31h 58m -
Wessex Water SEMINGTON SEMINGTON BROOK Semington Brook 4 29h 26m -
Wessex Water COULSTON Semington Brook 7 28h 24m 0 h
Wessex Water BRADFORD-ON-AVON MARKET STREET JUNCTION WITH CHURCH STREET River Avon 29 27h 27m 0 h
Wessex Water MELKSHAM SEMINGTON ROAD O/S POLICE STATION River Avon 8 25h 6m -
Wessex Water BRADFORD-ON-AVON SPRING FIELD AND WOOLLEY STREET JUNCTION River Avon 5 24h 8m -
Wessex Water BRADFORD-ON-AVON MARKET STREET JUNCTION WITH CHURCH STREET River Avon 13 24h 6m -
Wessex Water BRADFORD-ON-AVON STORM TANK River Avon 4 21h 32m -
Wessex Water BROUGHTON GIFFORD CURTIS ORCHARD Of Chalfield Brook 4 21h 27m -
Wessex Water CALNE QUEMERFORD BRIDGE River Marden 4 20h 50m -
Wessex Water BOWERHILL SHAILS LANE INLET Berryfield Stream 7 19h 56m -
Wessex Water DEVIZES WEBBS LANE STORM TANK Waylen Brook 3 19h 45m -
Wessex Water LAVINGTON WOODBRIDGE STORM TANK Semington Brook 5 18h 45m -
Wessex Water CALNE ROUGH LEAZE River Marden 2 18h 26m -
Wessex Water MELKSHAM SEMINGTON ROAD Unknown 2 18h 5m -
Wessex Water BOX VALENS TERRACE By Brook 7 15h 24m -
Wessex Water BOWERHILL SHAILS LANE INLET Berryfield Stream 3 13h 30m -
Wessex Water WINSLEY STORM TANK River Avon 4 13h 7m -
Wessex Water MELKSHAM SEMINGTON ROUNDABOUT Unknown 2 12h 40m -
Wessex Water COLERNE STORM TANK By Brook 3 12h 26m -
Wessex Water BRADFORD-ON-AVON MARKET STREET/ SILVER STREET JUNCTION River Avon 5 11h 34m 832 h
Wessex Water BOX RECREATION GROUND (ADJ TO) By Brook 8 11h 20m -
Wessex Water CALNE QUEMERFORD BRIDGE River Marden 4 10h 58m -
Wessex Water MONKTON COMBE MILL LANE Midford Brook 8 10h 56m -
Wessex Water URCHFONT STORM TANK Semington Brook 2 10h 50m -
Wessex Water POTTERNE STORM TANK Semington Brook 3 10h 28m -
Wessex Water BRADFORD-ON-AVON SPRING FIELD AND WOOLLEY STREET JUNCTION River Avon 5 8h 48m 608 h
Wessex Water GREAT HINTON Semington Brook 2 8h 26m -
Wessex Water BRADFORD-ON-AVON CULVER STREET RECREATION PARK River Avon 2 7h 23m -
Wessex Water BOX RECREATION GROUND (ADJ TO) By Brook 19 7h 22m -
Wessex Water BOX VALENS TERRACE By Brook 5 7h 6m -
Wessex Water WINSLEY STORM TANK River Avon 2 6h 58m -
Wessex Water COATE SPANIELS BRIDGE River Avon 3 6h 28m -
Wessex Water KEEVIL THE STREET Semington Brook 2 5h 58m 8 h
Wessex Water ROWDE TOWER VIEW Summerham Brook 5 4h 59m -
Wessex Water POTTERNE STORM TANK Semington Brook 2 4h 54m -
Wessex Water GREAT HINTON Semington Brook 1 4h 30m -
Wessex Water LITTLETON PANELL CORNBURY MILL Unknown 6 4h 30m -
Wessex Water ERLESTOKE PARK STORM TANK Erlestoke Stream 1 4h 12m -
Wessex Water EASTERTON MANOR HOUSE Easterton Brook 3 3h 50m -
Wessex Water POULSHOT MILL LANE Summerham Brook 1 3h 38m -
Wessex Water POULSHOT MILL LANE Summerham Brook 2 3h 32m -
Wessex Water BRADFORD-ON-AVON CULVER STREET RECREATION PARK River Avon 3 3h 15m -
Wessex Water DEVIZES ROUNDWAY HOSPITAL Summerham Brook 4 3h 14m -
Wessex Water ROWDE STORM TANK Summerham Brook 1 3h 12m -
Wessex Water COLERNE STORM TANK By Brook 2 2h 45m -
Wessex Water LITTLETON PANELL CORNBURY MILL Unknown 4 2h 42m -
Wessex Water ERLESTOKE PARK STORM TANK Erlestoke Stream 2 2h 30m -
Wessex Water Unknown Unknown 1 2h 18m -
Wessex Water DEVIZES VALLEY SEWER Poulshot Stream 3 1h 48m -
Wessex Water LITTLETON PANELL RUSSELL MILL LANE Semington Brook Via Sws 6 1h 46m -
Wessex Water DEVIZES ROUNDWAY HOSPITAL Summerham Brook 2 1h 38m -
Wessex Water WORTON MILL ROAD Semington Brook 1 1h 32m -
Wessex Water ROWDE TOWER VIEW Summerham Brook 1 0h 56m -
Wessex Water DEVIZES DUNKIRK HILL Summerham Brook 4 0h 54m -
Wessex Water GREAT CHEVERELL CHEVERELL GREEN Semington Brook 1 0h 47m -
Wessex Water XXXXX XXXXXXXX BARTON BRIDGE BARTON FARM (175M DS) River Avon 1 0h 42m -
Wessex Water WEST LAVINGTON CHURCHILL ARMS NEW Semington Brook Via Sws 3 0h 30m -
Wessex Water XXXXX XXXXXXXX BARTON BRIDGE BARTON FARM (175M DS) River Avon 1 0h 28m -
Wessex Water LITTLETON PANELL RUSSELL MILL LANE Semington Brook Via Sws 1 0h 18m -
Wessex Water WEST LAVINGTON CHURCHILL ARMS NEW Semington Brook Via Sws 1 0h 8m -
Wessex Water Unknown Unknown 0 0h 2 h
Wessex Water Unknown Unknown 0 0h 7 h
Wessex Water Unknown Unknown 0 0h -
Wessex Water ROWDE STORM TANK Summerham Brook 0 0h -
Wessex Water EASTERTON MANOR HOUSE Easterton Brook 0 0h -
Wessex Water BULKINGTON WICKLEAZE Semington Brook 0 0h 355 h
Wessex Water MELKSHAM SEMINGTON ROUNDABOUT Unknown 0 0h -
Wessex Water Unknown Unknown 0 0h 17 h
Wessex Water POTTERNE WICK Worton Stream 0 0h 9 h
Wessex Water DEVIZES DUNKIRK HILL Summerham Brook 0 0h -
Wessex Water BRADFORD-ON-AVON MARKET STREET/ SILVER STREET JUNCTION River Avon 0 0h -
Wessex Water POTTERNE WICK Worton Stream 0 0h 2 h
Wessex Water SEEND BELL INN / BELL HILL Summerham Brook 0 0h 0 h
Wessex Water Unknown Unknown 0 0h 101 h
Wessex Water SEEND BELL INN / BELL HILL Summerham Brook 0 0h 12 h
Wessex Water Unknown Unknown 0 0h -
Wessex Water Unknown Unknown 0 0h -
Wessex Water KEEVIL THE STREET Semington Brook 0 0h -
Wessex Water HORTON HORTON FARM Etchilhampton Water 0 0h -
Wessex Water DEVIZES VALLEY SEWER Poulshot Stream 0 0h -

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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