Top of the Poops | Constituency Sewage Map | Cardiff East

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Live data for Cardiff East in 2026

So far this year (as of 18 May 2026, 12:00) there has been 160 hours of sewage overflows, from 5 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s

Totals for Cardiff East in 2025

4 Sites polluted by Dwr Cymru Welsh Water

176 sewage dumps

2,206 hours duration

That's 3.06 months. 3.4 times a week, on average

Change Over Time

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Constituencies near Cardiff East

Waterways in Cardiff East

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Cardiff East 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 constituency 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	Severn Estuary	Kimberley Road CSO	117	1,906	98.5
Dwr Cymru Welsh Water	River Rhymney	Ball Lane CSO	45	280	99.9
Dwr Cymru Welsh Water	River Rhymney	Fishponds Road No22 CSO, Llanrumey	10	14	99.9
Dwr Cymru Welsh Water	River Rhymney	Rumney Hill CSO	4	5	100
Dwr Cymru Welsh Water	Rhymney River	Hartland Road PS	0	0	99.9
Dwr Cymru Welsh Water	Roath Brook	Kimberly Road CSO	0	0	99.9

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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