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Area of Outstanding Natural Beauty

Tamar Valley

Polluted by sewage 2,028 times in 2025 - lasting 22,781 hours - That's 2.64 years!

Monitoring fell below 50% in some locations so could be more

Marker shade

Totals for Tamar Valley in 2025

37 Sites polluted by South West Water

2,028 sewage dumps

22,781 hours duration

That's 2.64 years. On average 5.6 times a day

How does Tamar Valley compare?

Tamar Valley was the #4 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

Take Action

Sewage pollution map of Tamar Valley, showing 2,028 overflows in 2025

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Constituencies

Pollution Summary 2025

Here are all the reported sewage overflow totals for Tamar 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 Tamar 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 %
South West Water	Milton Stream	STOKE HILL WWTW	135	2,367	99.9
South West Water	River Inny	BEALS MILL WWTW	125	1,867	100
South West Water	Landrake Stream	LANDRAKE WASTEWATER TREATMENT WORKS	91	1,755	100
South West Water	River Tamar Estuary	ST DOMINICK WWTW	93	1,669	98.5
South West Water	River Inny	BEALS MILL PUMPING STATION	77	1,618	100
South West Water	Milton Stream	STOKE HILL WWTW	92	1,538	100
South West Water	River Tamar	MILTON ABBOT WWTW	83	1,455	100
South West Water	River Tamar	ST DOMINICK PUMPING STATION	72	1,066	100
South West Water	Tidal River Tamar	BERE ALSTON STW	91	1,031	100
South West Water	River Tamar	HAREWOOD ROAD CSO	164	1,029	99.9
South West Water	Unknown	BERE ALSTON STW	82	978	100
South West Water	River Tamar	GUNNISLAKE WWTW	94	955	100
South West Water	River Tavy	BUCKLAND MONACHORUM WWTW	52	941	100
South West Water	River Tavy	CROWNDALE COTTAGES CSO	72	815	74.9
South West Water	River Tamar	PLAYING FIELDS PUMPING STATION	73	660	100
South West Water	River Tamar	LATCHLEY STW	42	604	98.9
South West Water	River Tamar	GUNNISLAKE WWTW	72	440	100
South West Water	Polbathic Lake	ST GERMANS WWTW	27	295	100
South West Water	River Tavy	BERE FERRERS PUMPING STATION	66	268	100
South West Water	River Tamar	CHILSWORTHY WWTW	41	250	95.7
South West Water	River Tamar Via Sws	GUNNISLAKE NO.2 CSO	82	230	97.8
South West Water	River Lyner	FORDER NO 1 PSCSO/EO	28	200	98.9
South West Water	St Mellion Stream	ST MELLION PUMPING STATION	22	145	100
South West Water	River Lynher Estuary	ANTONY STW (INLET TO WORKS) SSO	64	133	98.1
South West Water	River Tamar	CARGREEN PSCSO/EO	49	130	100
South West Water	River Tavy	CROWNDALE WWTW	9	121	5.9
South West Water	Alren Stream	OLD MILL PS	25	98	91.3
South West Water	River Tamar Via Sws	BERE ALSTON COMBINED SEWER OVERFLOW	45	51	100
South West Water	River Tamar	LOWER KELLY PSCSO/EO	8	18	100
South West Water	River Lyner	FORDER NO 2 PSCSO/EO	5	8	98.9
South West Water	River Tamar	THE QUAY COMBINED SEWER OVERFLOW	19	7	100
South West Water	Stream	ST MELLION PUMPING STATION	2	6	100
South West Water	River Lyner	LANDRAKE PUMPING STATION	3	6	100
South West Water	Polbathic Stream	POLBATHIC VILLAGE PS	16	5	100
South West Water	Hamoaze	WILCOVE STW	2	2	100
South West Water	River Lynher	SHEVIOCK STW SO	1	0	99.3
South West Water	River Tamar	VICARGE GARDENS CSO MILTON ABBOT	4	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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