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We get information about overflowing CSOs since January 2025. Here is a chart of the last three months of data for Newport East, here you can see overflows in red, the darker the red, the more the CSO overflowed that day.
Each CSO has a row, the most recent data is on the right hand side.
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Donate Now| Company | Site Name | Receiving Waterway | Overflow Days | Total Duration (hours) | Total Duration (days) |
|---|---|---|---|---|---|
| Dwr Cymru Welsh Water | Malpas Road Storm Overflow | Malpas Brook | 114 | 1,018 h 30m | 42.42 |
| Dwr Cymru Welsh Water | Nash WwTW Storm Overflow | Julian's Pill | 53 | 615 h | 25.62 |
| Dwr Cymru Welsh Water | Underwood Storm Overflow | Monks Ditch | 53 | 604 h 30m | 25.17 |
| Dwr Cymru Welsh Water | Maesglas Storage Storm Overflow | Ebbw Estuary | 55 | 554 h 9m | 23.08 |
| Dwr Cymru Welsh Water | Caerleon Road Ponthir Overflow | Afon Lwyd | 77 | 275 h 45m | 11.46 |
| Dwr Cymru Welsh Water | Christchurch WwTW Storm Overflow | Unnamed Tributary of the River Usk | 59 | 193 h 2m | 8.04 |
| Dwr Cymru Welsh Water | Usk Road Storm Overflow | River Usk | 21 | 179 h 45m | 7.46 |
| Dwr Cymru Welsh Water | Pill South Storm Overflow | Usk Estuary | 50 | 175 h | 7.29 |
| Dwr Cymru Welsh Water | South Of Huxley Green Rear Storm Overflow | trib of Malpas Brook | 45 | 168 h | 7 |
| Dwr Cymru Welsh Water | Rowan Way Storm Overflow | Pillmawr Creek | 25 | 148 h 30m | 6.17 |
| Dwr Cymru Welsh Water | Llanover Close Newport Overflow | Pantyreos Brook | 31 | 133 h 4m | 5.54 |
| Dwr Cymru Welsh Water | Pill North Storm Overflow | Usk Estuary | 52 | 119 h 15m | 4.96 |
| Dwr Cymru Welsh Water | Pilton Vale Storm Overflow | Pillmawr Creek | 19 | 113 h 39m | 4.71 |
| Dwr Cymru Welsh Water | St. Cadoc's Hospital Storm Overflow | River Usk | 24 | 72 h 45m | 3 |
| Dwr Cymru Welsh Water | Horrocks Close Woodlands Storm Overflow | Pillmawr Creek | 16 | 47 h 45m | 1.96 |
| Dwr Cymru Welsh Water | Shaftesbury Park Storm Overflow | River Usk Estuary | 8 | 38 h 30m | 1.58 |
| Dwr Cymru Welsh Water | Wavell Drive Storm Overflow | Pillmawr Creek | 11 | 34 h 56m | 1.42 |
| Dwr Cymru Welsh Water | Hartridge Newport Storm Overflow | Lliswerry Pill Reen | 8 | 33 h 15m | 1.38 |
| Dwr Cymru Welsh Water | Somerton Road Storm Overflow | Liswerry Pill Reen | 20 | 28 h | 1.17 |
| Dwr Cymru Welsh Water | Bettws Lane Storm Overflow | Malpas Brook | 8 | 25 h 47m | 1.04 |
| Dwr Cymru Welsh Water | St. Julians Avenue Newport Storm Overflow | Unnamed Tributary of the Afon Wysg | 18 | 25 h 15m | 1.04 |
| Dwr Cymru Welsh Water | Liswerry Storm Overflow | River Usk Estuary | 17 | 22 h | 0.92 |
| Dwr Cymru Welsh Water | Chepstow Road 1 Storm Overflow | Liswerry Pill Reen | 11 | 18 h 11m | 0.75 |
| Dwr Cymru Welsh Water | Maple Close Storm Overflow | Monks Ditch | 7 | 12 h 31m | 0.5 |
| Dwr Cymru Welsh Water | Pillmawr Road Storm Overflow | Tributary of the Pillmawr Reen | 11 | 11 h | 0.46 |
| Dwr Cymru Welsh Water | Robertson Way Storm Overflow | Pillmawr Creek | 6 | 10 h 12m | 0.42 |
| Dwr Cymru Welsh Water | Liswerry Road Storm Overflow | Liswerry Pill Reen | 14 | 9 h 25m | 0.38 |
| Dwr Cymru Welsh Water | Chepstow Road 2 Storm Overflow | Liswerry Pill Reen | 8 | 8 h 45m | 0.33 |
| Dwr Cymru Welsh Water | Brynglas Road Storm Overflow | Crindau Pill | 11 | 6 h 55m | 0.25 |
| Dwr Cymru Welsh Water | Barrack Hill Road Storm Overflow | Malpas Brook | 12 | 4 h 58m | 0.17 |
| Dwr Cymru Welsh Water | Cold Bath Lane Storm Overflow | River Usk Estuary | 2 | 2 h 45m | 0.08 |
| Dwr Cymru Welsh Water | Howe Circle Storm Overflow | Unnamed Watercourse (via Culvert) to Liswerry Pill Reen | 1 | 2 h 44m | 0.08 |
| Dwr Cymru Welsh Water | Lodge Road Storm Overflow | Tributary of Afon Wysg | 2 | 1 h 2m | 0.04 |
| Dwr Cymru Welsh Water | Church Street Roundabout Storm Overflow | Usk Estuary | 1 | 0 h 29m | 0 |
| Dwr Cymru Welsh Water | Usk road Caerleon Storm Overflow | Afon Lwyd | 1 | 0 h 15m | 0 |
| Dwr Cymru Welsh Water | Caerleon Storm Overflow | River Usk | 0 | 0 h | 0 |
| Dwr Cymru Welsh Water | Unknown | Unknown | 0 | 0 h | 0 |
| Dwr Cymru Welsh Water | Treberth Crescent Storm Overflow | Unnamed watercourse | 0 | 0 h | 0 |
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