Join Us 3rd November 2024 - London

March for Clean Water

Caerphilly was polluted by sewage 1,880 times in 2023
lasting 10,722 hours - that's 1.24 years!
- but monitoring was disabled in some locations, so could be more

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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 Caerphilly in 2023
37 Sites polluted by Dwr Cymru Welsh Water
1,880 sewage dumps
10,722 h duration
That's 1.24 years! On average 5.2 times a day
Change Over Time
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Constituencies near Caerphilly
Waterways in Caerphilly

Pollution Summary 2023

Here are all the reported sewage overflow totals for Caerphilly 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 Porset Brook CSO at Lansbury Park Estate 183 2,557 98.2
Dwr Cymru Welsh Water Sirhowy River CSO 20 OLD MILL NEWPORT ROAD 141 1,404 99.8
Dwr Cymru Welsh Water River Rhymney CWM LAS CSO 98 1,107 99
Dwr Cymru Welsh Water River Rhymney CSO at Glan-yr-Afon Nursing Home No2, Pengam 121 1,080 98.8
Dwr Cymru Welsh Water River Rhymney Tredomen AFC CSO, Ystrad Mynach 95 1,045 100
Dwr Cymru Welsh Water River Sirhowy Springfield Est CSO, Pontllanfraith 119 574 97.9
Dwr Cymru Welsh Water Nant Y Aber Combined Sewer Overflow at Bryn Siriol 101 355 95.9
Dwr Cymru Welsh Water River Sirhowy Bottom of Nine Mile Point Colliery CSO 49 324 95.7
Dwr Cymru Welsh Water River Rhymney CSO at Glan-yr-Afon Nursing Home 1 101 245 99.3
Dwr Cymru Welsh Water Nant Yr Aber Graig-Y-Fedw CSO 55 239 96.8
Dwr Cymru Welsh Water River Rymney MAESYCWMMER A472 JUNCTION CSO 83 203 99.4
Dwr Cymru Welsh Water Nant Caeach Combined Sewer Overflow at Rear of 33 Church Street 14 183 99.9
Dwr Cymru Welsh Water River Rhymney Tir-y-Berth behind William St 67 164 99.3
Dwr Cymru Welsh Water River Rhymney Forge Engineering CSO, Bedwas 48 154 96.8
Dwr Cymru Welsh Water River Rhymney TRELYN LANE CSO FLEUR-DE-LIS 17 140 9.9
Dwr Cymru Welsh Water Sirhowy River WVTS - Wattsville (Recreation Ground) CSO 55 129 98.6
Dwr Cymru Welsh Water River Sirhowy Old Tram Rd CSO, Pontllanfraith 59 113 99.7
Dwr Cymru Welsh Water Sirhowy River CSO 19 Gryphonn Concrete Products 80 111 99.9
Dwr Cymru Welsh Water Nant Cylla Oaks End Close CSO 49 99 99.7
Dwr Cymru Welsh Water River Rhymney A CSO AT YSTRAD MYNACH BRIDGE 74 96 98.5
Dwr Cymru Welsh Water Sirhowy River WVTS-WYLLIE HALT SSO 39 94 98.6
Dwr Cymru Welsh Water River Rhymney CSO at Pengham High St near Bridge 42 73 98.3
Dwr Cymru Welsh Water Nant Yr Aber Crossways Retail Park CSO 22 58 99.4
Dwr Cymru Welsh Water Nant Yr Aber CSO Rear Commerc'l St Senghenydd 31 39 100
Dwr Cymru Welsh Water River Rhymney Newport Rd CSO, Trethomas 20 39 99.2
Dwr Cymru Welsh Water River Rhymney CSO ASSET NO 90411 PENGAM 35 21 99.7
Dwr Cymru Welsh Water River Rhymney High St CSO, Glan-y-Nant 13 19 99.9
Dwr Cymru Welsh Water River Rhymney Forge Rd CSO, Machen 19 16 99.7
Dwr Cymru Welsh Water River Rhymney Asset No. 32207 Celtic Steel Factory CSO 24 13 99.7
Dwr Cymru Welsh Water Nant Cwm-Parc 64 Commercial Streetreet CSO, Senghenydd 11 7 99
Dwr Cymru Welsh Water Nant Yr Aber Windsor Place Senghenydd CSO 4 7 100
Dwr Cymru Welsh Water River Sirhowy Islwyn Rd CSO, Crosskeys 6 1 94.9
Dwr Cymru Welsh Water Nant-Yr-Aber 86 Nantgarw Rd CSO 1 0 32.7
Dwr Cymru Welsh Water River Rhymney Rear of Williams St CSO 1 0 100
Dwr Cymru Welsh Water Nant Yr Aber Abertridwr Coed Cae Road 1 CSO 1 0 100
Dwr Cymru Welsh Water Rhymney R - Nant Bargod Rhymni To Conf Nant Cyl Fleur-de-Lys - Rear of Glanddu CSO 1 0 99.9
Dwr Cymru Welsh Water River Rhymney CSO at Trelyn Park 1 0 99.9
Dwr Cymru Welsh Water River Sirhowy Railway Cottages CSO, Cwmfelinfach 0 0 100
Dwr Cymru Welsh Water Rhymney River Old Prince Albert Hotel CSO, Hengoed 0 0 100
Dwr Cymru Welsh Water River Rhymney OLD PRINCE ALBERT HOTEL HENGOED 0 0 100
Dwr Cymru Welsh Water River Rhymney BEDWAS SUNNYBANK FARM CSO 0 0 0
Dwr Cymru Welsh Water River Rhymney COMBINED SEWER OVERFLOW SERVING 0 0 100

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. 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.

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Contains OS data © Crown copyright and database right 2021-2023

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