Media Queries
Get in touch if you have queries or want to discuss our data.
press [at] top-of-the-poops.org
Please Support Us
We rely on donations to fund our work. Please support us if you can
Polluted by sewage 458 times in 2025 lasting 3,798 hours
Your local MP is Sarah Gibson (Liberal Democrat) - Find out more about their interests, donors, and voting at They Work For You
Please consider a one-off or small recurring donation. We need your help to keep this site going.
Donate NowHere are all the reported sewage overflow totals for Chippenham 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 | Abberd Brook | THE PONDS PS | 70 | 1,501 | 98.8 |
| Wessex Water | River Avon | CHIPPENHAM WATER RECYCLING CENTRE | 40 | 495 | 99.95 |
| Wessex Water | Springs Watercourse | RAF LYNEHAM WWTW | 24 | 315 | 100 |
| Wessex Water | River Marden | CALNE WASTEWATER TREATMENT WORKS | 47 | 299 | 100 |
| Wessex Water | Hancock'S Water | WOOTTON BASSETT WWTW | 24 | 265 | 99.9 |
| Wessex Water | Rivers Brook | COMPTON BASSETT WWTW | 16 | 192 | 100 |
| Wessex Water | Hardenhuish Brook | GASTON ROAD CSO | 46 | 191 | 100 |
| Wessex Water | Unknown | MOSSES MILL CSO 2 | 44 | 146 | 100 |
| Wessex Water | Unknown | BRISTOL ROAD CSO | 53 | 79 | 100 |
| Wessex Water | River Avon | WESTMEAD PUMPING STATION | 6 | 66 | 99.7 |
| Wessex Water | Cowage Brook, | TOCKENHAM | 17 | 53 | 99.7 |
| Wessex Water | Hancock'S Water | WOOTTON BASSETT CSO | 14 | 50 | 99.9 |
| Wessex Water | Bristol Avon | LACOCK WATER RECYCLING CENTRE | 8 | 48 | 100 |
| Wessex Water | River Marden | PATFORD STREET CSO | 10 | 33 | 93.9 |
| Wessex Water | River Avon | MONKTON PARK OFFICES CSO | 6 | 21 | 100 |
| Wessex Water | Byde Mill Brook | NETHERCOTE HILL PUMPING STATION | 6 | 21 | 100 |
| Wessex Water | River Avon Via Sws | LONG CLOSE CSO | 6 | 5 | 100 |
| Wessex Water | River Marden | THE STRAND CSO | 10 | 4 | 95.1 |
| Wessex Water | River Avon | CHARTER ROAD CSO | 1 | 3 | 94.7 |
| Wessex Water | River Avon | WOOD LANE CSO | 7 | 1 | 100 |
| Wessex Water | Unknown | PATFORD ST/BANK OF RIVER MARDEN CSO | 1 | 0 | 100 |
| Wessex Water | River Marden Via Sws | WOOD STREET COMBINED SEWER OVERFLOW | 1 | 0 | 100 |
| Wessex Water | River Avon | MARY STREET COMBINED SEWER OVERFLOW | 1 | 0 | 100 |
| Wessex Water | Unknown | DALLAS ROAD CSO | 0 | 0 | 100 |
| Wessex Water | River Marden Via Sws | MARKET HILL CSO | 0 | 0 | 100 |
| Wessex Water | Unknown | MOSSES MILL CSO 1 | 0 | 0 | 100 |
| Wessex Water | Westbury Park W/C Via Sws | NEW ROAD COMBINED SEWER OVERFLOW | 0 | 0 | 100 |
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.
Get in touch if you have queries or want to discuss our data.
press [at] top-of-the-poops.org