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Here are all the reported sewage overflow totals for River Llyfni in 2025. Sometimes sewage can be being dumped for months at a time.
| Company | Waterway | Site | Sewage Dumps | Duration (Hours) | Reporting % |
|---|---|---|---|---|---|
| Dwr Cymru Welsh Water | River Llyfni | Nantlle PS | 102 | 1,553 | 99.9 |
| Dwr Cymru Welsh Water | River Llyfni | LLANLLYFNI CAERNARFON STW | 113 | 1,504 | 99.8 |
| Dwr Cymru Welsh Water | River Llyfni | Talysarn No 3 - CSO | 86 | 827 | 99.9 |
| Dwr Cymru Welsh Water | River Llyfni | CAERAU STH CSO ASSET 52420 MAESTEG | 49 | 648 | 99.9 |
| Dwr Cymru Welsh Water | River Llyfni | Talysarn No 4 - CSO | 87 | 567 | 99.8 |
| Dwr Cymru Welsh Water | River Llyfni | Llanllyfni Glan Aber CSO | 130 | 340 | 99 |
| Dwr Cymru Welsh Water | River Llyfni | Settled Storm Sewage at Llanllyfni WwTW | 27 | 280 | 99.9 |
| Dwr Cymru Welsh Water | River Llyfni | PONTLLYFNI STW | 28 | 142 | 99.9 |
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.
Get in touch if you have queries or want to discuss our data.
press [at] top-of-the-poops.org