Top of the Poops | Place | Acrefair and Cefn-mawr | Polluted by Dwr Cymru Welsh Water

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Totals for Acrefair and Cefn-mawr in 2025

9 Sites polluted by Dwr Cymru Welsh Water

187 sewage dumps

653 hours duration

That's 3.89 weeks. 3.6 times a week, on average

Change Over Time

Constituency for Acrefair and Cefn-mawr

Nearby Constituencies

Waterways in Acrefair and Cefn-mawr

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Acrefair and Cefn-mawr 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 Dee	CEFN MAWR WwTW	48	318	99.9
Dwr Cymru Welsh Water	Tref Y Nant Brook	CEFN PS	46	157	99.5
Dwr Cymru Welsh Water	Tref Y Nant Brook	Cefn Monsanto CSO	28	58	99.5
Dwr Cymru Welsh Water	Eitha	Ruabon PS	20	51	99.9
Dwr Cymru Welsh Water	Eitha	Ruabon Paddock Row CSO	7	20	96.9
Dwr Cymru Welsh Water	River Dee	Rhosymedre Park Rd CSO	11	16	99.2
Dwr Cymru Welsh Water	Tref Y Nant Brook	Trefor Isaf - CSO	16	14	99.9
Dwr Cymru Welsh Water	River Dee	Newbridge SPS	7	14	99.7
Dwr Cymru Welsh Water	River Dee	CSO at Rear Hamden Way Plas Madoc	4	1	99.6

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

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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