It's a Dirty Business

Watch Channel 4's documentary about the state of the water industry, then sign the petition to bring water back to public ownership.

Cardiff North - Live Sewage

Polluted by sewage 1,000 hours in 2026 so far..

© OpenStreetMap contributors
Contains OS Data © Crown copyright & database right 2021-2024
© Top of the Poops 2021-2024

Which Year?

Select Another Constituency

Select the constituency from the drop-down
✔ means we have live data (𝑥 if not)

View Annual Sewage Data

You're looking at the totals that we have calculated for sewage in Cardiff North so far for 2026. It is an estimate, based on very poor quality live data from the Water Companies. The water companies report their sewage to the Environment Agency every year in April. You can see the last reported year in the other page

What's a potential overflow? If the CSO goes 'Offline' while its Overflowing, we don't know if it stopped overflowing until we get a 'Stop' event.

Take Action

Your local MP is Anna McMorrin (Labour) - Find out more about their interests, donors, and voting at They Work For You

Share this page, post a message, and tell others about the huge problem of sewage pollution across the UK

Daily Data

Jan - 284 hours
Feb - 676 hours
Mar - 22 hours
Apr - 5 hours
May - 12 hours
Jun - 0 hours
Jul - 0 hours
We need your support!

Please consider a one-off or small recurring donation. We need your help to keep this site going.

Donate Now

Totals so far

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Offline/Potential Pollution
Dwr Cymru Welsh Water Began Road Cardiff Storm Overflow No2 River Rhymni 58 573h 45m -
Dwr Cymru Welsh Water Tongwynlais Recreation Ground Storm Overflow River Taff 24 366h -
Dwr Cymru Welsh Water Ynys Bridge 2 Storm Overflow River Taff 10 35h 37m -
Dwr Cymru Welsh Water Parc Caedelyn Storm Overflow Rhydwaedlyd Brook 8 15h 25m -
Dwr Cymru Welsh Water Heathwood Road Storm Overflow Nant Y Wedal 5 7h 13m -
Dwr Cymru Welsh Water Westbourne Crescent Bottom Cardiff Storm Overflow River Taff 3 2h 28m -
Dwr Cymru Welsh Water Heol Amlwch Storm Overflow River Taff via culverted watercourse 1 0h 29m -
Dwr Cymru Welsh Water Began Road Cardiff Storm Overflow Rhymney 0 0h -
Dwr Cymru Welsh Water St. Mellons Bridge Road Storm Overflow River Rhymni 0 0h -

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.