Chippenham - 2025 Sewage

Polluted by sewage 3,887 hours in 2025

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

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You're looking at the totals that we have calculated for sewage in Chippenham for 2025. It is an estimate, based on very poor quality live data from the Water Companies. This may not align with the 'official' reported sewage values from the water companies, which is reported in April following then end of the year - so 2025 numbers are reported in April 2026.

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Constituencies near Chippenham

Daily Data

We get information about overflowing CSOs since January 2025. Here is a chart of the last three months of data for Chippenham, 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.

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

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Total Duration (days)
Wessex Water COMPTON BASSETT THE POND Abberd Brook 53 1,151 h 30m 47.96
Wessex Water CHIPPENHAM BLACKWELL HAMS STORM TANK River Avon 22 320 h 6m 13.33
Wessex Water CHIPPENHAM BLACKWELL HAMS STORM TANK River Avon 17 240 h 2m 10
Wessex Water THINGLEY COPPERSHELL LANE STORM TANK Byde Mill Brook/River Avon 13 213 h 55m 8.88
Wessex Water THINGLEY COPPERSHELL LANE STORM TANK Byde Mill Brook/River Avon 17 196 h 37m 8.17
Wessex Water LYNEHAM B SITE (MAIN STW) RAF LYNEHAM STORM TANK Springs Watercourse 12 164 h 28m 6.83
Wessex Water CALNE STORM TANK River Marden 14 138 h 57m 5.75
Wessex Water COMPTON BASSETT STORM TANK Rivers Brook 10 119 h 29m 4.96
Wessex Water ROYAL WOOTTON BASSETT STORM TANK Hancock'S Water 10 117 h 44m 4.88
Wessex Water LYNEHAM B SITE (MAIN STW) RAF LYNEHAM STORM TANK Springs Watercourse 10 113 h 48m 4.71
Wessex Water CALNE STORM TANK River Marden 9 101 h 20m 4.21
Wessex Water CHIPPENHAM GASTONS ROAD Hardenhuish Brook 29 99 h 15m 4.12
Wessex Water ROYAL WOOTTON BASSETT STORM TANK Hancock'S Water 6 98 h 20m 4.08
Wessex Water CALNE MOSSES MILL X River Marden 25 93 h 6m 3.88
Wessex Water CHIPPENHAM GASTONS ROAD Hardenhuish Brook 18 90 h 44m 3.75
Wessex Water COMPTON BASSETT STORM TANK Rivers Brook 7 73 h 8m 3.04
Wessex Water LACOCK STORM TANK Bristol Avon 5 60 h 22m 2.5
Wessex Water CALNE MOSSES MILL X River Marden 17 51 h 36m 2.12
Wessex Water CHIPPENHAM HIGH STREET O/S XX River Avon 31 46 h 23m 1.92
Wessex Water CHIPPENHAM HIGH STREET O/S XX River Avon 16 45 h 48m 1.88
Wessex Water CHIPPENHAM WESTMEAD River Avon 2 38 h 22m 1.58
Wessex Water CHIPPENHAM BRISTOL ROAD Hardenhuish Brook 16 36 h 4m 1.5
Wessex Water LACOCK STORM TANK Bristol Avon 5 28 h 58m 1.17
Wessex Water CHIPPENHAM WESTMEAD River Avon 4 28 h 40m 1.17
Wessex Water COMPTON BASSETT THE POND Abberd Brook 3 27 h 52m 1.12
Wessex Water ROYAL WOOTTON BASSETT NEAR STW Hancock'S Water 9 26 h 14m 1.08
Wessex Water CHIPPENHAM BRISTOL ROAD Hardenhuish Brook 13 26 h 10m 1.08
Wessex Water CALNE INLET River Marden 8 24 h 9m 1
Wessex Water CALNE INLET River Marden 6 17 h 13m 0.71
Wessex Water CHIPPENHAM MONKTON PARK OFFICES River Avon 2 16 h 12m 0.67
Wessex Water CALNE MARDEN HOUSE CULVERT AT REAR River Marden 3 13 h 36m 0.54
Wessex Water LACOCK NETHERCOTE HILL Byde Mill Brook 2 12 h 48m 0.5
Wessex Water ROYAL WOOTTON BASSETT NEAR STW Hancock'S Water 10 12 h 46m 0.5
Wessex Water TOCKENHAM INLET Cowage Brook, 3 11 h 22m 0.46
Wessex Water CHIPPENHAM BLACKWELL HAMS INLET River Avon 1 6 h 0.25
Wessex Water CHIPPENHAM XX LONG CLOSE River Avon Via Sws 6 5 h 26m 0.21
Wessex Water CHIPPENHAM MONKTON PARK OFFICES River Avon 4 4 h 26m 0.17
Wessex Water CHIPPENHAM THE IVY River Avon 1 3 h 34m 0.12
Wessex Water CALNE MARDEN HOUSE CULVERT AT REAR River Marden 5 2 h 54m 0.08
Wessex Water THINGLEY COPPERSHELL LANE INLET Byde Mill Brook/River Avon 1 2 h 9m 0.08
Wessex Water CALNE STRAND / CHURCH STREET River Marden 5 1 h 58m 0.04
Wessex Water CALNE STRAND / CHURCH STREET River Marden 1 1 h 6m 0.04
Wessex Water CALNE RIVER MARDEN (RIVER BANK) SOUTH MARDEN HOUSE NEW ROAD River Marden 1 0 h 58m 0
Wessex Water CHIPPENHAM WOOD LANE River Avon 1 0 h 46m 0
Wessex Water TOCKENHAM INLET Cowage Brook, 2 0 h 32m 0
Wessex Water LACOCK NETHERCOTE HILL Byde Mill Brook 1 0 h 14m 0
Wessex Water CHIPPENHAM WOOD LANE River Avon 1 0 h 8m 0
Wessex Water THINGLEY COPPERSHELL LANE INLET Byde Mill Brook/River Avon 1 0 h 3m 0
Wessex Water CALNE OXFORD ROAD / WOOD STREET River Marden Via Sws 0 0 h 0
Wessex Water CHIPPENHAM COMMONS SLIP River Avon 0 0 h 0
Wessex Water CALNE MOSSES MILL 1 River Marden 0 0 h 0
Wessex Water CALNE MOSSES MILL 1 River Marden 0 0 h 0
Wessex Water CHIPPENHAM BLACKWELL HAMS INLET River Avon 0 0 h 0
Wessex Water CHIPPENHAM DALLAS ROAD Hardenhuish Brook 0 0 h 0
Wessex Water CALNE RIVER MARDEN (RIVER BANK) SOUTH MARDEN HOUSE NEW ROAD River Marden 0 0 h 0
Wessex Water CHIPPENHAM DALLAS ROAD Hardenhuish Brook 0 0 h 0

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.

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© 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

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