It's a Dirty Business

Watch Channel 4's documentary about the state of the water industry, then sign the petition to bring water back to public ownership.

Melksham and Devizes

Polluted by sewage 1,116 times in 2025 lasting 9,796 hours - That's 1.13 years!

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

Select Another Constituency

Select the constituency from the drop-down
✔ means we have live data (𝑥 if not)

Live data for Melksham and Devizes in 2026

So far this year (as of 18 May 2026, 12:00) there has been 9,473 hours of sewage overflows, from 130 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s - that's 1.1 years!

Totals for Melksham and Devizes in 2025

54 Sites polluted by Wessex Water
1,116 sewage dumps
9,796 hours duration
That's 1.13 years. On average 3.1 times a day

Change Over Time

Take Action

Your local MP is Brian Mathew (Liberal Democrat) - Find out more about their interests, donors, and voting at They Work For You

Share this page, post a message, and tell others about the huge problem of sewage pollution across the UK
Post
Post

Constituencies near Melksham and Devizes

Waterways in Melksham and Devizes

We need your support!

Please consider a one-off or small recurring donation. We need your help to keep this site going.

Donate Now

Pollution Summary 2025

Here are all the reported sewage overflow totals for Melksham and Devizes 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 River Avon SPANIEL'S BRIDGE PUMPING STATION 52 1,077 99.9
Wessex Water River Marden BROADS GREEN PS 54 1,057 100
Wessex Water River Avon MELKSHAM WWTW 71 803 100
Wessex Water Seend Hill Stream SEEND WASTEWATER TREATMENT WORKS 33 601 99.8
Wessex Water Lam Brook Stream CHURCH LANE FARM PS 40 523 100
Wessex Water Clackers Brook SCOUT HUT CSO 56 512 99.9
Wessex Water River Frome WESTWOOD WATER RECYCLING CENTRE 30 421 99.2
Wessex Water By Brook BOX WASTEWATER TREATMENT WORKS 45 413 96.6
Wessex Water Berryfield Stream BOWERHILL WASTEWATER TREATMENT WORK 45 413 100
Wessex Water River Marden ROUGH LEAZE 23 395 99.9
Wessex Water Bristol Avon FRESHFORD WRC 32 360 99.9
Wessex Water South Brook SHAW C OF E SCHOOL CSO 40 278 100
Wessex Water River Avon THE STAR PUMPING STATION 48 253 100
Wessex Water Summerham Brook TOWNSEND PS 19 237 100
Wessex Water Semington Brook LAVINGTON (WOODBRIDGE) WWTW 15 187 100
Wessex Water Semington Brook SEMINGTON BROOK PUMPING STATION 13 183 99.8
Wessex Water Semington Brook COULSTON PUMPING STATION 18 173 100
Wessex Water Unknown THE GREEN PUMPING STATION 14 169 100
Wessex Water By Brook MILL LANE PUMPING STATION 40 165 100
Wessex Water Chalfield Brook SOUTH WRAXALL STW 12 164 100
Wessex Water Semington Brook MILL ROAD PUMPING STATION 12 126 100
Wessex Water Etchilhampton Water HORTON FARM PUMPING STATION 75 113 100
Wessex Water Semmington Brook WICKLEASE PUMPING STATION 8 110 99.8
Wessex Water Semington Brook URCHFONT WASTEWATER TREATMENT WORKS 13 98 100
Wessex Water River Avon BRADFORD ON AVON WWTW 10 97 100
Wessex Water River Avon SEMINGTON ROAD CSO 22 81 100
Wessex Water Waylen Brook DEVIZES WATER RECYCLING CENTRE 10 79 99.9
Wessex Water Unknown CURTIS ORCHARD PUMPING STATION 7 77 100
Wessex Water Semington Brook GANGBRIDGE S P STN 8 59 100
Wessex Water River Avon MARKET STREET CSO 47 53 100
Wessex Water River Avon BARTON FARM CSO 8 53 95.8
Wessex Water By Brook RECREATION GROUND 1 CSO 29 50 97.4
Wessex Water River Avon WOOLLEY STREET CSO 18 50 94.9
Wessex Water Unknown SEMINGTON ROAD PUMPING STATION 6 49 100
Wessex Water River Avon SILVER STREET CSO 8 48 84.9
Wessex Water Semington Brook GREAT HINTON PUMPING STATION 6 48 100
Wessex Water River Marden QUEMERFORD BRIDGE CSO 12 45 96.7
Wessex Water Semington Brook POTTERNE WRC 8 25 100
Wessex Water By Brook RECREATION GROUND 2 CSO 43 25 100
Wessex Water River Avon WINSLEY WASTEWATER TREATMENT WORKS 6 20 99.9
Wessex Water By Brook COLERNE WATER RECYLCING CENTRE 4 15 99.9
Wessex Water Unknown SEMINGTON ROUNDABOUT 2 12 100
Wessex Water Summerham Brook MILL LANE COMBINED SEWER OVERFLOW 2 11 100
Wessex Water River Avon POUND LANE CSO 4 10 100
Wessex Water Erlestoke Stream ERLESTOKE WATER RECYCLING CENTRE 2 6 98.7
Wessex Water Semington Brook KEEVIL PUMPING STATION 1 5 99.8
Wessex Water Summerham Brook TOWERVIEW PUMPING STATION 6 5 100
Wessex Water Summerham Brook ROUNDWAY HOSPITAL CSO 6 5 100
Wessex Water Easterton Brook MANOR HOUSE COMBINED SEWER OVERFLOW 2 4 100
Wessex Water Summerham Brook ROWDE WASTEWATER TREATMENT WORKS 1 3 100
Wessex Water Semington Brook Via Sws RUSSELL MILL LANE CSO 11 2 100
Wessex Water Poulshot Stream VALLEY SEWER CSO 4 2 100
Wessex Water Semington Brook Via Sws CHURCHILL ARMS COMBINED SEWER OF 8 1 100
Wessex Water Summerham Brook DUNKIRK HILL PUMPING STATION 7 1 100
Wessex Water Summerham Brook BELL HILL SPS 0 0 100
Wessex Water Worton Stream POTTERNEWICK PUMPING STATION 0 0 100

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.

Top of the Poops

Analysing sewage pollution by the Water Industry

Follow on Instagram

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
Yes! Support TOTP!

© 2020-2025 Top-Of-The-Poops CC-BY-SA 4.0,
© Openstreetmap contributors, Contains OS data © Crown copyright and database right 2021-2025,
Contains Water UK National Storm Overflow Hub Data CC-BY-SA 4.0 and analysis © 2025 Top-Of-The-Poops

Some data reproduced under Open Government Licence

Please don't scrape these pages - we can maybe share our data with you

Full Copyright information available at: our GitHub page