South West Wiltshire was polluted by sewage 792 times in 2024
lasting 5,261 hours

Constituency

Select the constituency from the drop-down

✔ means we have experimental daily data since 2023

Live data for South West Wiltshire in 2025

So far this year (as of Apr 16, 2025, 6:15 PM) there has been 1,936 hours of sewage overflows

Totals for South West Wiltshire in 2024

26 Sites polluted by Wessex Water

792 sewage dumps
5,261 h duration

That's 7.31 months. On average 2.2 times a day

Change Over Time

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Constituencies near South West Wiltshire

Waterways in South West Wiltshire

Daily Data

We get information about overflowing CSOs since January 2025. Here is a chart of the last three months of data for South West Wiltshire, 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 South West Wiltshire 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 29 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	Shreen Water	MERE WATER RECYCLING CENTRE	95	958	99.9
Wessex Water	Shreen Water	CLEMENTS LANE COMBINED SEWER OF	59	652	90.8
Wessex Water	Fairbourne Stream	DILTON MARSH STW	65	631	100
Wessex Water	Bitham Brook/ Bitham Brook	WESTBURY WATER RECYCLING CENTRE	80	589	99.95
Wessex Water	River Wylye	WARMINSTER WWTW	33	381	100
Wessex Water	Buckington Drove	TINHEAD	48	381	100
Wessex Water	River Biss Via Sws	LADYDOWN MILL COMBINED SEWER OF	41	295	99.5
Wessex Water	F/E-River Avon, Cso-River Biss	TROWBRIDGE WASTEWATER TRTMNT WORKS	31	281	99.9
Wessex Water	Lambrok Stream	CHANTRY GARDENS PS	36	240	99.9
Wessex Water	Were Via Sws	CALVESWATER PUMPING STATION	54	224	100
Wessex Water	Rodden Brook	DIVERS BRIDGE PUMPING STATION	16	151	99.9
Wessex Water	Shreen Water	MERE COMBINED SEWER OVERFLOW	63	138	100
Wessex Water	River Wyle Via Were	LAKE PLEASURE GARDENS CSO	66	114	100
Wessex Water	Bitham Brook	BRATTON-TROWBRIDGE ROAD PS	28	107	100
Wessex Water	Allebourne Brook	DILTON MARSH CSO	25	60	99.6
Wessex Water	River Biss Via Sws	STALLARD STREET CSO	4	21	99.2
Wessex Water	Biss Brook	PENN KNAPP PS	5	18	100
Wessex Water	Groundwater Via Infilt System	MAIDEN BRADLEY WWTW	2	3	99.7
Wessex Water	River Frome	MAIDEN BRADLEY CSO	18	2	62.4
Wessex Water	Were	GEORGE STREET CSO	8	2	99.9
Wessex Water	Biss Brook	CHURCHLANDS PUMPING STATION	1	1	98.9
Wessex Water	Shreen Water	HAZZARDS HILL CSO	5	1	99.1
Wessex Water	Shreen Water	TALBOT COTTAGE CSO	3	0	87.8
Wessex Water	Bitham Brook	ALFRED STREET CSO	3	0	99.5
Wessex Water	Bitham Brook Via Sws	WEST END COMBINED SEWER OVERFLOW	2	0	99.5
Wessex Water	River Biss	6 WICKER HILL CSO	1	0	96.3
Wessex Water	River Biss Via Sws	SHIRES CAR PARK CSO	0	0	98.9
Wessex Water	Paxcroft Brook Via Sws	POLEBARN ROAD CSO	0	0	92.1
Wessex Water	River Wylye	MONKTON DEVERILL WRC	0	0	95.2

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

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