Melksham and Devizes was polluted by sewage 2,631 times in 2024
lasting 27,698 hours - that's 3.21 years!

Constituency

Select the constituency from the drop-down

✔ means we have experimental daily data since 2023

Live data for Melksham and Devizes in 2025

So far this year (as of Apr 16, 2025, 5:30 PM) there has been 5,950 hours of sewage overflows - that's 0.69 years!

Totals for Melksham and Devizes in 2024

54 Sites polluted by Wessex Water

2,631 sewage dumps
27,698 h duration

That's 3.21 years! On average 7.2 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

Constituencies near Melksham and Devizes

Waterways in Melksham and Devizes

Daily Data

We get information about overflowing CSOs since January 2025. Here is a chart of the last three months of data for Melksham and Devizes, here you can see overflows in red, the darker the red, the more the CSO overflowed that day.

Each CSO has a row, the most recent data is on the right hand side.

Monitoring Online Monitoring Offline Polluting Potentially Polluting Unknown

Daily data is experimental and data is not guaranteed to be accurate. Please inform us of any issue, we will fix.

Pollution Summary 2024

Here are all the reported sewage overflow totals for Melksham and Devizes in 2024. 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 0 of the total 56 CSO locations had reporting enabled for less than half the year, of which 0 had zero reporting.

Company	Waterway	Site	Sewage Dumps	Duration (Hours)	Reporting %
Wessex Water	River Avon	SPANIEL'S BRIDGE PUMPING STATION	192	4,371	100
Wessex Water	River Marden	BROADS GREEN PS	116	2,459	92.3
Wessex Water	River Avon	MELKSHAM WWTW	135	2,004	99.7
Wessex Water	Seend Hill Stream	SEEND WASTEWATER TREATMENT WORKS	82	1,372	99.7
Wessex Water	Lam Brook Stream	CHURCH LANE FARM PS	81	1,191	100
Wessex Water	Bristol Avon	FRESHFORD WRC	81	1,060	100
Wessex Water	Berryfield Stream	BOWERHILL WASTEWATER TREATMENT WORK	95	1,039	99.9
Wessex Water	River Frome	WESTWOOD WATER RECYCLING CENTRE	62	1,037	100
Wessex Water	Clackers Brook	SCOUT HUT CSO	81	1,031	99.9
Wessex Water	By Brook	BOX WASTEWATER TREATMENT WORKS	92	943	99.7
Wessex Water	Semington Brook	COULSTON PUMPING STATION	57	755	99.7
Wessex Water	Summerham Brook	TOWNSEND PS	58	712	100
Wessex Water	South Brook	SHAW C OF E SCHOOL CSO	79	711	100
Wessex Water	River Avon	THE STAR PUMPING STATION	82	595	100
Wessex Water	Semington Brook	URCHFONT WASTEWATER TREATMENT WORKS	49	543	99.8
Wessex Water	Semington Brook	SEMINGTON BROOK PUMPING STATION	35	506	100
Wessex Water	Semington Brook	LAVINGTON (WOODBRIDGE) WWTW	45	505	100
Wessex Water	Chalfield Brook	SOUTH WRAXALL STW	44	492	99.4
Wessex Water	River Marden	ROUGH LEAZE	36	465	100
Wessex Water	River Marden	QUEMERFORD BRIDGE CSO	49	390	84.9
Wessex Water	Etchilhampton Water	HORTON FARM PUMPING STATION	189	376	100
Wessex Water	Unknown	THE GREEN PUMPING STATION	31	335	99.3
Wessex Water	By Brook	MILL LANE PUMPING STATION	59	334	100
Wessex Water	Summerham Brook	TOWERVIEW PUMPING STATION	62	323	100
Wessex Water	Waylen Brook	DEVIZES WATER RECYCLING CENTRE	36	304	100
Wessex Water	Semmington Brook	WICKLEASE PUMPING STATION	22	300	89.6
Wessex Water	River Avon	BRADFORD ON AVON WWTW	29	282	100
Wessex Water	River Avon	POUND LANE CSO	54	275	99.8
Wessex Water	By Brook	RECREATION GROUND 1 CSO	59	264	99.5
Wessex Water	River Avon	WINSLEY WASTEWATER TREATMENT WORKS	21	262	99.7
Wessex Water	Semington Brook	MILL ROAD PUMPING STATION	23	243	100
Wessex Water	Semington Brook	GREAT HINTON PUMPING STATION	26	236	94
Wessex Water	River Avon	SILVER STREET CSO	24	236	94
Wessex Water	River Avon	SEMINGTON ROAD CSO	41	197	100
Wessex Water	Semington Brook	GANGBRIDGE S P STN	24	187	100
Wessex Water	River Avon	BARTON FARM CSO	16	176	98.9
Wessex Water	Summerham Brook	ROWDE WASTEWATER TREATMENT WORKS	12	162	99.8
Wessex Water	Unknown	SEMINGTON ROAD PUMPING STATION	16	135	100
Wessex Water	Unknown	CURTIS ORCHARD PUMPING STATION	14	123	100
Wessex Water	Erlestoke Stream	ERLESTOKE WATER RECYCLING CENTRE	20	109	100
Wessex Water	River Avon	MARKET STREET CSO	64	108	100
Wessex Water	River Avon	WOOLLEY STREET CSO	38	91	99.4
Wessex Water	Unknown	SEMINGTON ROUNDABOUT	11	81	89.1
Wessex Water	Semington Brook	POTTERNE WRC	25	80	99.9
Wessex Water	Semington Brook	KEEVIL PUMPING STATION	10	71	100
Wessex Water	By Brook	COLERNE WATER RECYLCING CENTRE	14	55	100
Wessex Water	By Brook	RECREATION GROUND 2 CSO	50	47	97.8
Wessex Water	Summerham Brook	MILL LANE COMBINED SEWER OVERFLOW	7	27	99.3
Wessex Water	Summerham Brook	ROUNDWAY HOSPITAL CSO	17	27	100
Wessex Water	Summerham Brook	DUNKIRK HILL PUMPING STATION	18	20	84
Wessex Water	Easterton Brook	MANOR HOUSE COMBINED SEWER OVERFLOW	5	11	99
Wessex Water	Poulshot Stream	VALLEY SEWER CSO	11	9	99.1
Wessex Water	Semington Brook Via Sws	RUSSELL MILL LANE CSO	21	5	99.3
Wessex Water	Semington Brook Via Sws	CHURCHILL ARMS COMBINED SEWER OF	11	2	93.3
Wessex Water	Worton Stream	POTTERNEWICK PUMPING STATION	0	0	100
Wessex Water	Summerham Brook	BELL HILL SPS	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. This 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.

Analysing sewage pollution by the Water Industry

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!