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South West Wiltshire

Polluted by sewage 358 times in 2025 lasting 2,003 hours

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

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Live data for South West Wiltshire in 2026

So far this year (as of 10 Sept 2026, 11:15) there has been 2,777 hours of sewage overflows, from 62 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s

Sewage without rain in South West Wiltshire

On 1 occasion since December 2024, no rain fell anywhere in South West Wiltshire for days — and its CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s discharged anyway.

9 May 2025 1 at once · 0h

Totals for South West Wiltshire in 2025

24 Sites polluted by Wessex Water
358 sewage dumps
2,003 hours duration
That's 2.78 months. 6.9 times a week, on average

Change Over Time

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Waterways in South West Wiltshire

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Pollution Summary 2025

Here are all the reported sewage overflow totals for South West Wiltshire in 2025. Sometimes sewage can be being dumped for months at a time.

Reporting refers to how much of the time the monitoring was active. In this constituency all the declared CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s appeared to have monitoring enabled for more than 50% of the year

Company Waterway Site Sewage Dumps Duration (Hours) Reporting %
Wessex Water Fairbourne Stream DILTON MARSH STW 31 273 99.9
Wessex Water River Wylye WARMINSTER WWTW 18 238 100
Wessex Water Shreen Water MERE WATER RECYCLING CENTRE 26 234 100
Wessex Water Bitham Brook/ Bitham Brook WESTBURY WATER RECYCLING CENTRE 22 230 98.9
Wessex Water Shreen Water CLEMENTS LANE COMBINED SEWER OF 23 216 100
Wessex Water River Biss Via Sws LADYDOWN MILL COMBINED SEWER OF 21 165 100
Wessex Water Lambrok Stream CHANTRY GARDENS PS 18 148 100
Wessex Water Semington Brook COWLEAZE LANE COMBINED SEWER 15 123 99.9
Wessex Water F/E-River Avon, Cso-River Biss TROWBRIDGE WASTEWATER TRTMNT WORKS 11 111 100
Wessex Water River Wyle Via Were LAKE PLEASURE GARDENS CSO 45 55 100
Wessex Water Shreen Water MERE COMBINED SEWER OVERFLOW 39 52 100
Wessex Water Were Via Sws CALVESWATER PUMPING STATION 22 50 100
Wessex Water Groundwater Via Infilt System MAIDEN BRADLEY WWTW 26 45 100
Wessex Water Allebourne Brook DILTON MARSH CSO 10 21 94.5
Wessex Water Rodden Brook DIVERS BRIDGE PUMPING STATION 2 14 100
Wessex Water Bitham Brook BRATTON-TROWBRIDGE ROAD PS 7 12 99.9
Wessex Water Biss Brook PENN KNAPP PS 1 3 100
Wessex Water River Frome MAIDEN BRADLEY CSO 12 2 88.9
Wessex Water River Biss Via Sws STALLARD STREET CSO 2 1 97.5
Wessex Water Were GEORGE STREET CSO 3 0 100
Wessex Water Bitham Brook ALFRED STREET CSO 1 0 94.9
Wessex Water Shreen Water HAZZARDS HILL CSO 1 0 100
Wessex Water Paxcroft Brook Via Sws POLEBARN ROAD CSO 1 0 100
Wessex Water Shreen Water TALBOT COTTAGE CSO 1 0 100
Wessex Water River Biss 6 WICKER HILL CSO 0 0 100
Wessex Water Biss Brook CHURCHLANDS PUMPING STATION 0 0 100
Wessex Water River Wylye MONKTON DEVERILL WRC 0 0 100
Wessex Water River Biss Via Sws SHIRES CAR PARK CSO 0 0 99.7
Wessex Water Bitham Brook Via Sws WEST END COMBINED SEWER OVERFLOW 0 0 98.1

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.

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