Rhondda and Ogmore - Live Sewage

Polluted by sewage 31,209 hours in 2026 - That's 3.61 years so far..

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

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View Annual Sewage Data

You're looking at the totals that we have calculated for sewage in Rhondda and Ogmore 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.

Totals for Rhondda and Ogmore in 2026

Sewage31,209 hours
Monitoring offline0 hours
Potential pollution0 hours
Storm overflows116

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Constituencies near Rhondda and Ogmore

Daily Data

Jan - 3,693 hours
Feb - 7,246 hours
Mar - 2,003 hours
Apr - 411 hours
May - 4,039 hours
Jun - 7,406 hours
Jul - 742 hours
Aug - 275 hours
Sept - 1,650 hours
Oct - 3,662 hours
Nov - 77 hours
Daily data is experimental and data is not guaranteed to be accurate. Please inform us of any issue, we will fix.
Please note: We don't have rainfall data for Wales. If you know where to source it please let us know!
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Totals so far

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Offline/Potential Pollution
Dwr Cymru Welsh Water Hermon Street Treorchy Storm Overflow Rhondda Fawr River 185 2,949h 8m -
Dwr Cymru Welsh Water Llangeinor Bettws Street Storm Overflow River Garw 152 2,741h 2m -
Dwr Cymru Welsh Water Cemetery Road Ogmore Vale Storm Overflow Ogwr Fawr 155 2,585h 34m -
Dwr Cymru Welsh Water Dimbath Avenue Storm Overflow Ogwr Fach River 130 2,348h 30m -
Dwr Cymru Welsh Water Pen Dinas Road Dinas Storm Overflow Rhondda Fawr 123 1,821h 31m -
Dwr Cymru Welsh Water Brook Street Porth Storm Overflow River Rhondda 148 1,785h 33m -
Dwr Cymru Welsh Water Park View Tylorstown Storm Overflow Rhondda Fach River 114 1,599h 29m -
Dwr Cymru Welsh Water Ynys Park Storm Overflow Rhondda Fawr River 145 1,563h 2m -
Dwr Cymru Welsh Water St John Street Ogmore Vale Storm Overflow Ogwr Fach River 123 1,557h 28m -
Dwr Cymru Welsh Water Davies Street Tonypandy Storm Overflow River Clydach 127 1,514h 23m -
Dwr Cymru Welsh Water Craig Tal Y Fan Blackmill Storm Overflow River Ogmore 68 1,326h 20m -
Dwr Cymru Welsh Water Vicarage Road Penycraig Storm Overflow Culvert To Rhondda Fawr River 72 867h 29m -
Dwr Cymru Welsh Water Station Row Storm Overflow River Garw 77 838h 23m -
Dwr Cymru Welsh Water Llwynypia Road Storm Overflow River Rhondda 64 774h 32m -
Dwr Cymru Welsh Water Ely Valley Road Storm Overflow River Ely 80 722h 7m -
Dwr Cymru Welsh Water Pontycymmer Fenton Place Storm Overflow River Garw 92 626h 12m -
Dwr Cymru Welsh Water Gwendoline Street Sports Ground Storm Overflow Ogwr Fach River 88 571h 53m -
Dwr Cymru Welsh Water Pant Yr Awel Lewistown Storm Overflow Nany-Y-Ci 53 553h 10m -
Dwr Cymru Welsh Water Ferndale Banana Tip No. 3 Storm Overflow Rhondda Fach River 42 425h 25m -
Dwr Cymru Welsh Water Fir Street Rear Ferndale Storm Overflow Rhondda Fach River 68 402h 51m -
Dwr Cymru Welsh Water Rear of Elm Street Gilfach Goch Storm Overflow Ogwr Fach River 59 401h 47m -
Dwr Cymru Welsh Water Edmonedes Street Courts Storm Overflow Rhondda Fach River 41 283h 15m -
Dwr Cymru Welsh Water Ferndale Road Tylorstown Storm Overflow Rhondda Fach River 30 267h 18m -
Dwr Cymru Welsh Water Ystrad Road Church Road Junction Storm Overflow Rhondda Fawr River 123 237h 37m -
Dwr Cymru Welsh Water Greenwood Park Storm Overflow Rhondda Fach River 53 227h 40m -
Dwr Cymru Welsh Water Ynyscrug Roundabout Storm Overflow Rhondda Fawr River 21 218h 17m -
Dwr Cymru Welsh Water Glynfach Road Porth Storm Overflow Rhondda Fawr River 55 177h 7m -
Dwr Cymru Welsh Water Trealaw Road Tonypandy Overflow River Rhondda 52 166h 44m -
Dwr Cymru Welsh Water Trehafod Storm Tank Storm Overflow River Rhondda 13 152h 9m -
Dwr Cymru Welsh Water Oak Street Treherbert Storm Overflow Rhondda Fawr 29 106h 37m -
Dwr Cymru Welsh Water Mountain Row Storm Overflow Rhondda Fach River 35 96h 58m -
Dwr Cymru Welsh Water Tylacelyn Road Hughes Street Storm Overflow Rhondda Fawr River 42 92h 50m -
Dwr Cymru Welsh Water Station Road Ferndale Storm Overflow Rhondda Fach River 42 92h 47m -
Dwr Cymru Welsh Water School Street Ton Pentre Overflow Rhondda River 39 89h 3m -
Dwr Cymru Welsh Water Oakfield Terrace Storm Overflow Nant Y Ffosp 12 75h 40m -
Dwr Cymru Welsh Water Commercial Street Nant Y Moel Storm Overflow Ogwr Fawr River 36 73h 21m -
Dwr Cymru Welsh Water Waunrhydd Road Storm Overflow River Ely 16 71h 23m -
Dwr Cymru Welsh Water Ferndale Banana Tip No. 1 Storm Overflow Rhondda Fach River 13 53h 6m -
Dwr Cymru Welsh Water Aberrhondda Road Storm Overflow Rhondda Fach River 27 53h -
Dwr Cymru Welsh Water Cadwgan Terrace Storm Overflow River Rhondda 23 52h 13m -
Dwr Cymru Welsh Water Mill Street West Tonyrefail Storm Overflow River Ely 18 47h 7m -
Dwr Cymru Welsh Water Penycraig Roundabout Storm Overflow River Rhondda 16 45h 39m -
Dwr Cymru Welsh Water Dan-Y-Bryn Gilfach Goch Storm Overflow Ogwr Fach 22 43h 35m -
Dwr Cymru Welsh Water Blake Street Storm Overflow Rhondda Fach River 21 37h 39m -
Dwr Cymru Welsh Water Ogmore Valley Water Street Storm Overflow Ogwr Fawr River 4 35h 15m -
Dwr Cymru Welsh Water Ferndale Banana Tip Additional Tank Storm Overflow Rhondda Fach River 13 34h 28m -
Dwr Cymru Welsh Water Treherbert Blaencwm Road Storm Overflow Rhondda Fawr 13 31h 10m -
Dwr Cymru Welsh Water Railway Terrace Clydach Vale Storm Overflow River Clydach 15 29h 2m -
Dwr Cymru Welsh Water Cross Street Ynyshir Storm Overflow Rhondda Fach River 23 26h 45m -
Dwr Cymru Welsh Water Dunraven Street Storm Overflow River Rhondda Fawr 5 25h 59m -
Dwr Cymru Welsh Water Pontygwaith Bridge Storm Overflow Rhondda Fach River 10 23h 56m -
Dwr Cymru Welsh Water Gelligaled Park Tyntyla Road Storm Overflow Rhondda River Fawr 14 22h 58m -
Dwr Cymru Welsh Water Cwrt Gwalia Storm Overflow Ogwr Fawr River 6 22h 24m -
Dwr Cymru Welsh Water Station Road Maerdy Storm Overflow Rhondda Fach 13 21h 45m -
Dwr Cymru Welsh Water Highfield Industrial Estate Storm Overflow Rhondda Fach River 11 21h 8m -
Dwr Cymru Welsh Water South of River Street Ystrad Rhondda Overflow Rhondda Fach River 17 19h 10m -
Dwr Cymru Welsh Water Trehafod Storm Overflow River Rhondda 23 17h 45m -
Dwr Cymru Welsh Water Sherwood Street Llwynypia Storm Overflow Rhondda River Fawr 23 17h 1m -
Dwr Cymru Welsh Water De Winton Street Rear Storm Overflow Nant Clydach 6 14h 12m -
Dwr Cymru Welsh Water Commercial Place Pontycymer Overflow Garw 9 12h 12m -
Dwr Cymru Welsh Water Rees Street Gelli Storm Overflow Rhondda River Fawr 8 10h 51m -
Dwr Cymru Welsh Water Gwendoline Street Storm Overflow River Garw 2 10h 11m -
Dwr Cymru Welsh Water James Terrace Storm Overflow Rhondda Fach River 1 9h 44m -
Dwr Cymru Welsh Water Long Row Blaenllechau Storm Overflow Rhondda Fach River 9 9h 26m -
Dwr Cymru Welsh Water Old Brithweunydd Road Storm Overflow River Rhondda 3 7h 44m -
Dwr Cymru Welsh Water Maple Court Storm Overflow Nant Muchydd 3 6h 44m -
Dwr Cymru Welsh Water George Street Treherbert Storm Overflow River Rhondda 3 6h 28m -
Dwr Cymru Welsh Water David Street Treherbert Storm Overflow Rhondda Fawr River 1 3h 59m -
Dwr Cymru Welsh Water Ynyswen Rd Overflow Rhondda River 5 3h 56m -
Dwr Cymru Welsh Water Tylacelyn Road Rugby Club Storm Overflow River Rhondda 4 3h 31m -
Dwr Cymru Welsh Water River Street Ogmore Vale Storm Overflow Ogwr Fawr River 1 3h 30m -
Dwr Cymru Welsh Water Crichton Street Storm Overflow River Rhondda 6 3h 30m -
Dwr Cymru Welsh Water Railway Terrace Cwmparc Storm Overflow Nant Cwm Parc/Afon Rhondda Fach 2 3h 14m -
Dwr Cymru Welsh Water Hill Street Storm Overflow Rhondda Fawr River 6 2h 31m -
Dwr Cymru Welsh Water Elizabeth Close Pentre Storm Overflow Rhondda Fawr 1 1h 59m -
Dwr Cymru Welsh Water Wattstown Bailey Street Land reclam Site Storm Overflow Rhondda River Fawr 4 1h 53m -
Dwr Cymru Welsh Water Victoria Street Storm Overflow River Afan 3 1h 42m -
Dwr Cymru Welsh Water Herbert Street Storm Overflow River Rhondda 3 1h 14m -
Dwr Cymru Welsh Water Bute Street Treherbert Storm Overflow Rhondda Fawr 2 1h 13m -
Dwr Cymru Welsh Water Griffin Park Pentre Storm Overflow Rhondda Fawr River 2 0h 44m -
Dwr Cymru Welsh Water Blaen Y Cwm Road Blaencwm Overflow River Rhondda 2 0h 43m -
Dwr Cymru Welsh Water Tynybryn Road Storm Overflow River Ely 2 0h 43m -
Dwr Cymru Welsh Water Cymmer Road Porth Storm Overflow Rhondda Fawr 1 0h 29m -
Dwr Cymru Welsh Water Ynyscynon Road Storm Overflow Rhondda Fawr River 1 0h 29m -
Dwr Cymru Welsh Water Ashdale Road Storm Overflow River Ely 1 0h 29m -
Dwr Cymru Welsh Water Dolgwilym River Bridge Storm Overflow Rhondda Fach River 1 0h 14m -
Dwr Cymru Welsh Water William Street Ystrad 1 Storm Overflow River Rhondda Fawr 0 0h -
Dwr Cymru Welsh Water Lewis Street Pentre Storm Overflow Rhondda Fawr River 0 0h -
Dwr Cymru Welsh Water Unknown Unknown 0 0h -
Dwr Cymru Welsh Water Fern Street Storm Overflow Ogwr Fawr River 0 0h -
Dwr Cymru Welsh Water Unknown Unknown 0 0h -
Dwr Cymru Welsh Water Tyntyla Road Tonypandy Storm Overflow Rhondda Fawr River 0 0h -
Dwr Cymru Welsh Water St John Street Overflow Ogwr Fawr River 0 0h -
Dwr Cymru Welsh Water Llewellyn Street Storm Overflow River Rhondda Fawr 0 0h -
Dwr Cymru Welsh Water Glannant Road Storm Overflow Nant Abercerdin 0 0h -
Dwr Cymru Welsh Water Commercial Street Blaenllechau Storm Overflow River Rhondda Fach 0 0h -
Dwr Cymru Welsh Water East of Dyfodwg Street Junction with Station Road Storm Overflow Rhondda River Fawr 0 0h -
Dwr Cymru Welsh Water Clarence Street Pentre Storm Overflow Rhondda Fawr River 0 0h -
Dwr Cymru Welsh Water Blaen-Y-Cwm Terrace Storm Overflow Nant Ystradffernol 0 0h -
Dwr Cymru Welsh Water Rees Street West Storm Overflow River Rhondda 0 0h -
Dwr Cymru Welsh Water Furnace Road Pontygwaith Storm Overflow River Rhondda Fach 0 0h -
Dwr Cymru Welsh Water Park Road Cwmparc Storm Overflow Tributary of Nant Cwmparc 0 0h -
Dwr Cymru Welsh Water Penrhys Road Storm Overflow Rhondda Fach River 0 0h -
Dwr Cymru Welsh Water Railway Terrace Ogmore Vale Storm Overflow Ogwr Fawr River 0 0h -
Dwr Cymru Welsh Water Cuckoo Street Pontycymer Overflow River Garw 0 0h -
Dwr Cymru Welsh Water Treherbert Storm Overflow River Rhondda Fawr 0 0h -
Dwr Cymru Welsh Water Taff Street Rear Storm Overflow Rhondda Fach River 0 0h -
Dwr Cymru Welsh Water Pontycymmer Richard Street Storm Overflow Tributary of Afon Cynon 0 0h -
Dwr Cymru Welsh Water Mill Street Tonyrefail Storm Overflow River Ely 0 0h -
Dwr Cymru Welsh Water Taff Street Storm Overflow Rhondda Fach River 0 0h -
Dwr Cymru Welsh Water Unknown Unknown 0 0h -
Dwr Cymru Welsh Water Oxford Street Pontycymer Overflow River Garw 0 0h -
Dwr Cymru Welsh Water High Street Pontycymer Overflow River Garw 0 0h -
Dwr Cymru Welsh Water Tonyrefail Police Station Storm Overflow River Ely 0 0h -
Dwr Cymru Welsh Water Rheidol Close Rail Bridge Storm Overflow Rhondda Fawr 0 0h -
Dwr Cymru Welsh Water Llewellyn Street Pentre Storm Overflow River Cynon 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

Annual figures up to and including 2025 come from official water company returns. The 2026 figure is our own estimate, derived continuously from the companies' live data feeds.

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.

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Analysing sewage pollution by the Water Industry

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© Openstreetmap contributors, Contains OS data © Crown copyright and database right 2021-2025,
Contains Water UK National Storm Overflow Hub Data CC-BY-SA 4.0 and analysis © 2025 Top-Of-The-Poops

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