Top of the Poops | Place | Dorchester (Dorset)

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Totals for Dorchester (Dorset) in 2025

8 Sites polluted by Wessex Water

122 sewage dumps

1,086 hours duration

That's 1.51 months. 2.3 times a week, on average

Change Over Time

Constituency for Dorchester (Dorset)

Nearby Constituencies

Waterways in Dorchester (Dorset)

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Dorchester (Dorset) 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 place 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 Frome	DORCHESTER (LOUDS MILL) STW	44	644	99.85
Wessex Water	Dorchester Mill Stream	16 HIGH STREET CSO	29	234	99.9
Wessex Water	Unknown	CSO AT SCOUT HUT	9	127	99.5
Wessex Water	Mill Stream Via Sws	35 KINGS ROAD	29	53	100
Wessex Water	Unknown	CSO AT PRINCES BRIDGE	3	24	100
Wessex Water	River Frome Via Sws	CSO AT TOP OF SOUTH WALKS	2	1	97.7
Wessex Water	Mill Stream Via Sws	VICTORIA ROAD CSO	5	0	100
Wessex Water	Unknown	CSO AT 97 HIGH STREET	1	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.

Analysing sewage pollution by the Water Industry

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© 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

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