Caerdydd

Polluted by sewage 1,215 times in 2024 lasting 8,195 hours

Monitoring fell below 50% in some locations so could be more

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Totals for Caerdydd in 2024

33 Sites polluted by Dwr Cymru Welsh Water

1,215 sewage dumps

8,195 hours duration

That's 11.38 months. On average 3.3 times a day

Change Over Time

Waterways in Caerdydd

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Pollution Summary 2024

Here are all the reported sewage overflow totals for Caerdydd in 2024. 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 locality 2 of the total 33 CSO locations had reporting enabled for less than half the year.

Company	Waterway	Site	Sewage Dumps	Duration (Hours)	Reporting %
Dwr Cymru Welsh Water	River Taff	Tongwynlais CSO	121	1,936	89.2
Dwr Cymru Welsh Water	River Elai	St Fagans STW	120	1,548	99.8
Dwr Cymru Welsh Water	River Rhymney	Storm Water Overflow at Began, St Mellons	155	948	94.7
Dwr Cymru Welsh Water	River Rhymney	Ball Lane CSO	89	716	99.8
Dwr Cymru Welsh Water	Unknown	St Fagans STW	55	680	99.8
Dwr Cymru Welsh Water	Severn Estuary	CARDIFF CENTRAL SPS TREMORFA	93	668	99
Dwr Cymru Welsh Water	River Taff	Ynys Bridge CSO	43	362	98.7
Dwr Cymru Welsh Water	Severn Estuary	PENARTH HEAD SEWAGE PUMPING STATION	70	340	99.8
Dwr Cymru Welsh Water	River Ely	Penarth Llandough Moors Cardiff CSO, Cardiff	27	193	77.8
Dwr Cymru Welsh Water	Severn Estuary	Settled Storm Overflow at Cardiff Eastern District Pumping Station	50	183	99.8
Dwr Cymru Welsh Water	River Ely	CSO at TRELAI PARK STORM SEWAGE PS	58	177	99.8
Dwr Cymru Welsh Water	Cardiff Bay	Grangetown SPS	29	110	96.8
Dwr Cymru Welsh Water	Rhydwaedlyd Brook	Caedelyn Park Boundary CSO	49	67	99.1
Dwr Cymru Welsh Water	Nant-Y-Wedal	HEATHWOOD ROAD CSO, HEATHWOOD JUNCTION	46	55	98.5
Dwr Cymru Welsh Water	Rhymney River	Began Road CSO	7	36	98.3
Dwr Cymru Welsh Water	River Taff Estuary	Harrowby Street PS	31	28	83.6
Dwr Cymru Welsh Water	River Rhymney	Fishponds Road No22 CSO, Llanrumey	23	25	96.3
Dwr Cymru Welsh Water	River Taff	Cardiff Wood St/Havelock St Jn CSO	23	19	99
Dwr Cymru Welsh Water	Taff	Bottom of Westbourne Crescent CSO, Cardiff	29	13	97.9
Dwr Cymru Welsh Water	River Rhymney	Rumney Hill CSO	13	12	99.9
Dwr Cymru Welsh Water	River Taff Via Culverted Watercourse	ABERPORTH RD CSO	10	12	56
Dwr Cymru Welsh Water	River Ely Estuary	Cogan SPS	11	11	99.8
Dwr Cymru Welsh Water	Rhymney River	Hartland Road PS	2	10	99.6
Dwr Cymru Welsh Water	River Ely	Penarth Road WDPS	8	10	99.8
Dwr Cymru Welsh Water	River Taff	Park Street PS	12	8	99.8
Dwr Cymru Welsh Water	Severn Estuary	Kimberley Road CSO	4	7	30.7
Dwr Cymru Welsh Water	River Ely	Ely Mill Rd/Muston Rd CSO, Cardiff	18	5	99.7
Dwr Cymru Welsh Water	Severn Estuary	Penarth Marina SPS	9	3	38.1
Dwr Cymru Welsh Water	Severn Estuary	OCEAN PARK PS TREMORFA FORESHORE RO	3	1	99.8
Dwr Cymru Welsh Water	River Rhymney	CSO at Bridge Road, St Mellons, Cardiff	1	1	99.4
Dwr Cymru Welsh Water	River Ely	CSO at Cardiff Ely Plymouth Rd No 108	3	0	98.6
Dwr Cymru Welsh Water	Roath Brook	Kimberly Road CSO	2	0	99.3
Dwr Cymru Welsh Water	Cardiff Bay	Curran SPS	1	0	99.8

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

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.

Analysing sewage pollution by the Water Industry

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Caerdydd Polluted by sewage 1,215 times in 2024 lasting 8,195 hours Monitoring fell below 50% in some locations so could be more

Caerdydd