Tonyrefail

Polluted by sewage 218 times in 2025 lasting 1,385 hours

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Totals for Tonyrefail in 2025

7 Sites polluted by Dwr Cymru Welsh Water

218 sewage dumps

1,385 hours duration

Sewage pollution map of Tonyrefail — Sewage pollution map of Tonyrefail: 1,385 hours in 2025

That's 1.92 months. 4.2 times a week, on average

Change Over Time

Constituency for Tonyrefail

Nearby Constituencies

Waterways in Tonyrefail

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Tonyrefail 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 Ely	ELY VALLEY ROAD CSO,	113	1,118	99.8
Dwr Cymru Welsh Water	River Ely	CSO at Mill Street, Tonyrefail	51	141	99.4
Dwr Cymru Welsh Water	River Ely	CSO at Tonyrefail, Waunrhydd Road	39	112	98.8
Dwr Cymru Welsh Water	River Ely	CSO at Tynybryn Road Tonyrefail R-C-T	9	10	99.8
Dwr Cymru Welsh Water	Nant Muchydd	Capel Farm PS Emergency Tonyrefai	1	1	99.9
Dwr Cymru Welsh Water	River Ely	Tonyrefail, Mill St CSO	4	1	100
Dwr Cymru Welsh Water	River Ely	Mill St CSO, Tonyrefail	1	0	57.8

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.

Top of the Poops

Analysing sewage pollution by the Water Industry

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