Area of Outstanding Natural Beauty

North Wessex Downs - 2025 Sewage

Polluted by sewage 17,731 hours in 2025 - That's 2.05 years , monitoring offline 4,741 hours , potential overflows 244 hours

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

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Totals for North Wessex Downs in 2025

Sewage17,731 hours
Monitoring offline4,741 hours
Potential pollution244 hours
Storm overflows76

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Daily Data - when it rained, and when they spilled

Square = rainfall none → heavy
Drop = sewage minutes → all day
Potential pollution Monitoring offline
Jan - 5,179 hours , 18 potential
Feb - 5,693 hours , 6 potential
Mar - 3,985 hours , 93 offline
Apr - 1,366 hours , 3 offline
May - 13 hours , 718 offline
Jun - 1 hours , 923 offline
Jul - 2 hours , 153 offline
Aug - 4 hours
Sept - 4 hours , 55 offline
Oct - 18 hours , 754 offline
Nov - 286 hours , 111 potential
Dec - 1,175 hours , 109 potential

Storm overflows in and around North Wessex Downs

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Offline/Potential Pollution
Thames Water Winterbourne STW Winterbourne Stream 116 2,635h -
Thames Water South Moreton STW Mill Brook 125 2,594h 45m 1,282 h
Thames Water East Shefford STW River Lambourn 100 2,207h 15m -
Thames Water Marlborough STW Kennet 99 1,591h 15m 223 h
Thames Water Compton STW River Pang 79 1,332h 30m -
Wessex Water COMPTON BASSETT THE POND Abberd Brook 53 1,145h 10m 6 h
Wessex Water COLLINGBOURNE DUCIS River Bourne 79 645h 47m 36 h
Thames Water Hampstead Norreys STW River Pang 33 628h 30m -
Wessex Water COATE SPANIELS BRIDGE River Avon 36 467h 39m -
Thames Water Wash Water STW Pound Street Brook 26 391h -
Wessex Water CALNE ROUGH LEAZE River Marden 19 384h 58m 606 h
Thames Water Hamstead Marshall STW Hamstead Stream 19 374h 30m -
Wessex Water Unknown Unknown 19 315h 48m -
Thames Water Wash Water STW Pound Street Brook 20 312h 15m -
Thames Water Pangbourne STW River Sul 14 271h -
Thames Water Knights Lane (Ball Hill) SPS Enbourn 16 258h -
Thames Water Hamstead Marshall STW Hamstead Stream 17 186h 45m -
Thames Water Chapel Row STW River Bourne 15 185h 15m 434 h
Thames Water Briff Lane (Bucklebury) STW Briff Lane Stream 18 175h 15m -
Thames Water Knights Lane (Ball Hill) SPS Enbourn 13 166h 45m -
Wessex Water PEWSEY SALISBURY ROAD STORM TANK River Avon 16 143h 36m -
Thames Water Blind Mans Gate (Highclere) SPS Penwood Stream 14 135h -
Thames Water Beenham STW Webbs Lane Stream 14 130h 15m -
Thames Water Kintbury STW Kennet 10 128h 10m -
Wessex Water CHIRTON SMALL STREET Unnamed Watercourse 7 115h -
Wessex Water HORTON HORTON FARM Etchilhampton Water 60 107h 34m 0 h
Thames Water East Grafton STW River Dun 10 98h 30m 529 h
Wessex Water NORTH NEWNTON River Avon 5 76h 31m -
Thames Water Great Bedwyn STW Kennet And Avon Canal 6 73h 38m 220 h
Thames Water Blind Mans Gate (Highclere) SPS Penwood Stream 6 48h -
Wessex Water PEWSEY SALISBURY ROAD STORM TANK River Avon 5 43h 45m -
Thames Water Briff Lane (Bucklebury) STW Briff Lane Stream 4 42h 45m -
Wessex Water ALL CANNINGS River Avon 5 40h 32m -
Thames Water Chapel Row STW River Bourne 3 37h 30m -
Thames Water Kintbury STW Kennet 2 31h 44m -
Wessex Water COMPTON BASSETT THE POND Abberd Brook 3 27h 52m -
Wessex Water MARDEN HIGH STREET River Avon 2 23h 20m 2 h
Southern Water Unknown Unknown 5 20h 56m -
Wessex Water PATNEY WEIR River Avon 4 20h -
Wessex Water PEWSEY WILCOT LODGE River Avon 1 19h 8m -
Thames Water South Moreton STW Mill Brook 6 19h -
Wessex Water CALNE ROUGH LEAZE River Marden 2 18h 26m -
Wessex Water ALL CANNINGS River Avon 2 12h 32m -
Wessex Water PEWSEY SWAN River Avon 2 10h -
Thames Water East Grafton STW River Dun 1 8h 30m 337 h
Wessex Water CHIRTON SMALL STREET Unnamed Watercourse 1 7h 22m -
Wessex Water COATE SPANIELS BRIDGE River Avon 3 6h 28m -
Thames Water Chisledon storm tanks N/A 1 4h 18m 61 h
Thames Water Chisledon storm tanks N/A 1 3h 14m -
Wessex Water NORTH NEWNTON River Avon 1 2h 17m -
Wessex Water PATNEY WEIR River Avon 1 2h 8m -
Wessex Water Unknown Unknown 1 1h 44m 3 h
Thames Water London Road (Marlborough) SPS Kennet 2 1h 15m 1,199 h
Thames Water Marlborough STW Kennet 1 0h 30m -
Wessex Water PEWSEY SWAN River Avon 1 0h 9m -
Thames Water Pangbourne STW River Sul 0 0h -
Thames Water Draycot Foliat SPS River Ray 0 0h -
Wessex Water Unknown Unknown 0 0h 38 h
Thames Water Compton STW River Pang 0 0h -
Thames Water Ramsbury STW River Kennet 0 0h -
Thames Water Hampstead Norreys STW River Pang 0 0h -
Wessex Water PEWSEY WILCOT LODGE River Avon 0 0h -
Thames Water East Shefford STW River Lambourn 0 0h -
Wessex Water COLLINGBOURNE DUCIS River Bourne 0 0h -
Thames Water Winterbourne STW Winterbourne Stream 0 0h -
Thames Water Draycot Foliat SPS River Ray 0 0h -
Thames Water Beenham STW Webbs Lane Stream 0 0h -
Thames Water East Garston SPS River Lambourn 0 0h -
Thames Water East Garston SPS River Lambourn 0 0h -
Wessex Water HORTON HORTON FARM Etchilhampton Water 0 0h -
Wessex Water Unknown Unknown 0 0h 0 h
Wessex Water PEWSEY SALISBURY ROAD River Avon 0 0h -
Thames Water Chieveley STW Winterbourne Stream 0 0h -
Wessex Water MARDEN HIGH STREET River Avon 0 0h -
Thames Water London Road (Marlborough) SPS Kennet 0 0h -
Wessex Water PEWSEY SALISBURY ROAD River Avon 0 0h 1 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

Annual figures up to and including 2025 come from official water company returns. The 2026 figure is our own estimate, derived continuously from the companies' live data feeds.

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.