Area of Outstanding Natural Beauty

Dedham Vale

Polluted by sewage 127 times in 2025 - lasting 86 hours

Marker shade

Totals for Dedham Vale in 2025

4 Sites polluted by Anglian Water

127 sewage dumps

86 hours duration

Sewage pollution map of Dedham Vale, showing 127 overflows in 2025

That's 3.58 days. 2.4 times a week, on average

How does Dedham Vale compare?

Dedham Vale was the #36 most polluted Area of Outstanding Natural Beauty in England & Wales, by duration of sewage overflows, as reported by the water companies

Why the change?

Storm overflows spill when it rains, and 2025 was drier than 2024 - 90% of average annual rainfall against 105%.

So much of any drop is weather, not fixed pipes. The live page shows rainfall and sewage side by side, day by day.

Live Data

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Constituencies

Pollution Summary 2025

Here are all the reported sewage overflow totals for Dedham Vale in 2025.

How we count, and how accurate it is

A CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway counts towards Dedham Vale when it sits inside the designated area, or within 200 metres of its boundary. An overflow close to two AONBs is counted in both.

We use data from the water companies, but we are seeing many anomalies that make us believe that location information is quite poor. The situation is likely far worse than reported here.

Other CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s just outside the 200 metre boundary are not counted, though they may still affect water quality inside the area.

Company	Waterway	Site	Sewage Dumps	Duration (Hours)	Reporting %
Anglian Water	River Box	BOXFORD WATER RECYCLING CENTRE	3	46	100
Anglian Water	River Box	MILL LANE PS	120	24	100
Anglian Water	Dedham Mill Tail- Rv Stour	DEDHAM WATER RECYCLING CENTRE	2	10	100
Anglian Water	Wignall Brook	WIGNALL STREET PS	2	5	99.9

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

Annual figures up to and including 2025 come from official water company returns. The 2026 figure is our own estimate, derived continuously from the companies' live data feeds.

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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