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