Area of Outstanding Natural Beauty

Wye Valley

Polluted by sewage 697 times in 2025 - lasting 5,117 hours

Marker shade

Totals for Wye Valley in 2025

21 Sites polluted by Dwr Cymru Welsh Water

697 sewage dumps

5,117 hours duration

Sewage pollution map of Wye Valley, showing 697 overflows in 2025

That's 7.11 months. On average 1.9 times a day

How does Wye Valley compare?

Wye Valley was the #15 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 Wye Valley 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 Wye Valley 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 %
Dwr Cymru Welsh Water	Wye Estuary	ST BRIAVELS SEWAGE TREATMENT WORKS	136	1,198	99.9
Dwr Cymru Welsh Water	River Wye	CSO at Welsh Street Chepstow	130	1,054	99.9
Dwr Cymru Welsh Water	River Wye	NEWLAND SEWAGE TREATMENT WORKS	55	764	99.9
Dwr Cymru Welsh Water	River Wye	Monmouth Wastewater Treatment Works	43	435	99.8
Dwr Cymru Welsh Water	River Wye	JOYFORD MILL PUMPING STATION	24	375	99.9
Dwr Cymru Welsh Water	River Wye	Tintern Main SPS	20	326	99.9
Dwr Cymru Welsh Water	River Wye	HOPE AND ANCHOR CSO	56	273	95.8
Dwr Cymru Welsh Water	River Wye	LYDBROOK SEWAGE TREATMENT WORKS	24	251	99.9
Dwr Cymru Welsh Water	River Wye	ROSS LOWER CLEEVE WWTW	21	99	99.9
Dwr Cymru Welsh Water	River Wye	CSO AT NEWLAND STW	29	85	99.9
Dwr Cymru Welsh Water	River Wye Estuary	Chepstow North SPS The Back	59	72	99.9
Dwr Cymru Welsh Water	River Wye	HOMS ROAD PUMPING STATION CSO	23	61	99.9
Dwr Cymru Welsh Water	River Wye	FOWNHOPE SEWAGE TREATMENT WORKS CSO	10	29	99.9
Dwr Cymru Welsh Water	River Wye	WILTON SEWAGE PUMPING STATION	4	26	99.9
Dwr Cymru Welsh Water	Rudhall Brook	BRAMPTON STREET CSO	27	22	98.4
Dwr Cymru Welsh Water	River Wye	GREAT HOUGH BROOK CSO	10	13	99.9
Dwr Cymru Welsh Water	River Wye	CSO AT NEWLAND STW	7	13	96.6
Dwr Cymru Welsh Water	Rudhall Brook	CAWDOR ARCH COMBINED SEWER OVERFLOW	12	10	99.8
Dwr Cymru Welsh Water	River Wye	GREAT HOUGHBROOK PS ADJACENT TO FOR	3	4	99.8
Dwr Cymru Welsh Water	Small Brook	STATION ST COMBINED SEWER OVERFLOW	3	0	99.9
Dwr Cymru Welsh Water	River Wye	LOWER LYDBROOK RIVER WYE CSO	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

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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