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Here are all the reported sewage overflow totals for Tremadog Bay 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 | Tremadog Bay | CRICCIETH STW FINAL | 124 | 1,829 | 99.8 |
| Dwr Cymru Welsh Water | Tremadog Bay | HARLECH TERMINAL PS (OUTFALL A) | 57 | 991 | 99.9 |
| Dwr Cymru Welsh Water | Tremadog Bay | Llanbedrog SPS | 36 | 561 | 99.7 |
| Dwr Cymru Welsh Water | Tremadog Bay | CRICCIETH WEST PS , , | 51 | 398 | 99 |
| Dwr Cymru Welsh Water | Tremadog Bay | CRICCIETH EAST PS | 32 | 365 | 99.8 |
| Dwr Cymru Welsh Water | Tremadog Bay | LLANDANWG TERMINAL PS | 25 | 315 | 99.9 |
| Dwr Cymru Welsh Water | Tremadog Bay | MORFA BYCHAN WWTW | 58 | 184 | 99.9 |
| Dwr Cymru Welsh Water | Tremadog Bay | CRICCIETH WEST PS | 30 | 147 | 93.7 |
| Dwr Cymru Welsh Water | Tremadog Bay | CSO at Llandanwg SPS | 2 | 14 | 99.8 |
| Dwr Cymru Welsh Water | Tremadog Bay | MORFA BYCHAN WWTW | 2 | 9 | 100 |
| Dwr Cymru Welsh Water | Tremadog Bay | CSO ON SEWER (CRICCIETH BEACH) | 6 | 7 | 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