Monmouth polluted by sewage 2,679 times in 2023 - lasting 24,389 hours
- but monitoring was disabled in some locations, so could be more

© OpenStreetMap contributors
Contains OS Data © Crown copyright & database right 2021-2023
© Top of the Poops 2021-2023
✔ means we have experimental daily data since 2023
Totals for Monmouth in 2023
39 Sites polluted by Dwr Cymru Welsh Water
2,679 sewage dumps
24,389 h duration
That's 2.82 years! On average 7.3 times a day
Change Over Time

Pollution Summary 2023

Here are all the reported sewage overflow totals for Monmouth in 2023. 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 1 of the total 42 CSO locations had reporting enabled for less than half the year, of which 1 had zero reporting.

Company Waterway Site Sewage Dumps Duration (Hours) Reporting %
Dwr Cymru Welsh Water Mounton Brook Pwllmeyric SPS (CSO) 262 5,755 98.9
Dwr Cymru Welsh Water River Lwyd LLANFRECHFA STORM TANKS PONTHIR 178 2,262 100
Dwr Cymru Welsh Water River Usk Llangybi STW Llangybi Usk Settled Storm 234 2,097 100
Dwr Cymru Welsh Water River Usk GOYTRE SEWAGE TREATMENT WORKS NANT Setteled Storm 122 1,983 96
Dwr Cymru Welsh Water River Usk Usk STW Settled Storm 136 1,555 100
Dwr Cymru Welsh Water Clawdd Brook CSO at Great Oak STW 86 1,454 99.5
Dwr Cymru Welsh Water River Wye Estuary Chepstow South SPS Hunger Pill STW 142 1,378 100
Dwr Cymru Welsh Water River Usk Settled Storm Sewage Tanks at Pandy WwTW 62 884 100
Dwr Cymru Welsh Water Usk River ABERBAIDEN STW MONMOUTH 57 732 93.7
Dwr Cymru Welsh Water River Wye Tintern Main SPS 270 654 99.9
Dwr Cymru Welsh Water River Clydach Maesygwartha SPS and CSO 52 577 68.3
Dwr Cymru Welsh Water River Wye Settled Storm Sewage from Monmouth WwTW 66 545 99.9
Dwr Cymru Welsh Water River Wye Estuary Chepstow North Fairfield SPS 120 540 100
Dwr Cymru Welsh Water River Usk Settled Storm Sewage from Llanfoist Wastewater Treatment Works 60 527 100
Dwr Cymru Welsh Water River Honddu CSO at Pandy WWTW 44 474 100
Dwr Cymru Welsh Water Clydach River CLYDACH CSO 63 469 99.7
Dwr Cymru Welsh Water Usk River GOYTRE SEWAGE TREATMENT WORKS NANT 23 397 99.9
Dwr Cymru Welsh Water Mounton Brook Mathern SPS 29 298 99.9
Dwr Cymru Welsh Water River Wye MONMOUTH STW REDBROOK ROAD MONMOUTH 24 263 99.9
Dwr Cymru Welsh Water River Usk LLANFOIST WASTEWATER TREATMENT WORKS ME 21 257 100
Dwr Cymru Welsh Water River Usk USK STW GRAIG OLWAY FARM LLANGVIEW 11 156 100
Dwr Cymru Welsh Water Nant Y Wilcae RAGLAN STW CHEPSTOW ROAD RAGLAN 34 151 86.8
Dwr Cymru Welsh Water River Lwyd Chapel Lane CSO 39 133 99.6
Dwr Cymru Welsh Water Mynachdy Brook Bryn Y Gwenin SPS Abergavenny 14 120 100
Dwr Cymru Welsh Water Berthin Brook Little Mill CSO, Panty Pwdin 36 117 99.5
Dwr Cymru Welsh Water River Wye Monmouth 2 CSO 58 107 99.8
Dwr Cymru Welsh Water River Usk Mill Street Screens CSO Abergaven 56 95 100
Dwr Cymru Welsh Water River Wye Estuary Chepstow North SPS The Back 91 92 100
Dwr Cymru Welsh Water River Wye Thornwell Road CSO 65 75 100
Dwr Cymru Welsh Water River Lwyd Via Culvert And Unnamed Watercourse Rear of 15 Llwyn Onn CSO Croesyceiliog 39 54 95.6
Dwr Cymru Welsh Water River Wye CSO at Welsh Street Chepstow 66 50 100
Dwr Cymru Welsh Water River Lwyd 7 Olway Close CSO, Llanyravon 39 43 96.9
Dwr Cymru Welsh Water River Monnow CSO at Monmouth Town Pumping Station 25 38 100
Dwr Cymru Welsh Water River Lwyd 103 Beaumaris Drive Cwmbran CSO 8 11 99.5
Dwr Cymru Welsh Water River Wye Raglan Way CSO 24 8 99.9
Dwr Cymru Welsh Water River Clydach Glangrwyney Rd CSO, Gilwern 16 7 100
Dwr Cymru Welsh Water Rivr Wye WARREN SLADE SEWAGE PUMPING STATION 3 5 94.8
Dwr Cymru Welsh Water Nant Wilcae Raglan CSO No. 1 3 5 88.5
Dwr Cymru Welsh Water Olway Brook RAILWAY COTTAGE CSO 1 4 91.7
Dwr Cymru Welsh Water Blaen Bran Brook Llanfrechra Rose Cottage CSO 0 0 0
Dwr Cymru Welsh Water River Lwyd 3 Olway close CSO Llanyravon 0 0 9.7
Dwr Cymru Welsh Water River Lwyd 2 Llangorse Road CSO Llanyravon 0 0 97.4

Data Sources & Accuracy

EDM (Event Duration Monitoring) data and Consented Discharges to Controlled Waters with Conditions from Environment Agency & Data Map Wales

Experimental derived data from Thames Water API, Some data may be missing or inaccurate. This 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.