Blaenau Ffestiniog

Polluted by sewage 465 times in 2025 lasting 3,118 hours

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Totals for Blaenau Ffestiniog in 2025

7 Sites polluted by Dwr Cymru Welsh Water

465 sewage dumps

3,118 hours duration

Sewage pollution map of Blaenau Ffestiniog — Sewage pollution map of Blaenau Ffestiniog: 3,118 hours in 2025

That's 4.33 months. On average 1.3 times a day

Change Over Time

Constituency for Blaenau Ffestiniog

Nearby Constituencies

Waterways in Blaenau Ffestiniog

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Blaenau Ffestiniog 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 %
Dwr Cymru Welsh Water	River Bowydd	CWM BOWYDD SSO BLAENAU FFESTINIOG	109	916	99.9
Dwr Cymru Welsh Water	River Ceunant Sych	CSO at Land Off A496 Manod Blaenau Ffesti	123	773	97.4
Dwr Cymru Welsh Water	River Barlwyd	LAND OPP GLANLLYN NR OAKLEY SQUARE CSO	117	634	99.5
Dwr Cymru Welsh Water	River Goedol	CSO at Land Off Pencefn Road Tanygrisiau	80	446	98.9
Dwr Cymru Welsh Water	River Goedol	BLAENAU FFESTINIOG WWTW (Settled STORM)	22	334	100
Dwr Cymru Welsh Water	Barlwyd	BLAENAU FFESTINIOG NO2	12	13	98.6
Dwr Cymru Welsh Water	River Bowydd	Blaenau Ffestiniog CSO No 3	2	0	99.9
Dwr Cymru Welsh Water	River Bowydd	Blaenau Ffestiniog WWTW Settled Storm (B)	0	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.

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Analysing sewage pollution by the Water Industry

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