Castell-nedd

Polluted by sewage 1,265 times in 2025 lasting 4,746 hours

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Totals for Castell-nedd in 2025

32 Sites polluted by Dwr Cymru Welsh Water

1,265 sewage dumps

4,746 hours duration

Sewage pollution map of Castell-nedd: 4,746 hours in 2025

That's 6.59 months. On average 3.5 times a day

Change Over Time

Constituency for Castell-nedd

Nearby Constituencies

Waterways in Castell-nedd

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Castell-nedd in 2025. 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 place all the declared CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s appeared to have monitoring enabled for more than 50% of the year

Company	Waterway	Site	Sewage Dumps	Duration (Hours)	Reporting %
Dwr Cymru Welsh Water	Neath Estuary	Dynevor Junction SPS	108	934	99.9
Dwr Cymru Welsh Water	Estuarial Waters Of River Neath	Fairfield SPS, Neath	109	538	99.8
Dwr Cymru Welsh Water	Estuarial Waters Of River Neath	Melincryddan SPS	76	418	99.8
Dwr Cymru Welsh Water	River Clydach	Neath Abbey SPS	88	384	96
Dwr Cymru Welsh Water	River Clydach	CSO 27 Farmers Road Pumping Station	68	382	99.9
Dwr Cymru Welsh Water	River Neath Via Surface Water Sewer	Penrhiwtyn SPS	40	259	99.9
Dwr Cymru Welsh Water	Tennant Canal	OLD ROAD CSO OLD ROAD SKEWEN NEATH	83	253	99.9
Dwr Cymru Welsh Water	River Clydach	CSO NO 10 30M U/S ROADBRIDGE	82	214	99.3
Dwr Cymru Welsh Water	River Clydach	Rear No 1 Dyffryn V'W Bryn Coch CSO	53	211	99.9
Dwr Cymru Welsh Water	River Neath	CSO 48 NEATH RIVER BRIDGE ADJ CALOR	86	183	99.9
Dwr Cymru Welsh Water	Tennant Canal	CSO 49 LLANGATWG SCHOOL ABERDULIAS	33	123	99.9
Dwr Cymru Welsh Water	Esturial Water Of River Neath	Quay Road PS Town Centre Neath	64	104	99.6
Dwr Cymru Welsh Water	Estuarial Waters Of River Neath	Pentreffynnon Sewage Pumping Station at Neath Abbey Ind Estate, Neath	50	93	99.8
Dwr Cymru Welsh Water	River Neath	Gnoll Park Road CSO	71	69	99.4
Dwr Cymru Welsh Water	Neath Estuary	ABERDULAIS SPS	26	68	99.9
Dwr Cymru Welsh Water	River Clydach	CSO 8 Bryncoch 7B Bryncoch	15	64	99.9
Dwr Cymru Welsh Water	To Crymlyn Brook Via A Surface Water Culvert	Skewen SPS Park Avenue Lonlas Neath	20	57	99.9
Dwr Cymru Welsh Water	River Neath	GUNSIGHT OVERFLOW SWO 11 CSO	24	49	99.9
Dwr Cymru Welsh Water	Estuarial Waters Of Llantwit Stream	Llantwit Church SPS	21	48	99.9
Dwr Cymru Welsh Water	Tidal River Neath	Llandarcy 36" Outfall	45	40	98.8
Dwr Cymru Welsh Water	River Neath	Cadoxton Road CSO Cadoxton Road	3	39	99.9
Dwr Cymru Welsh Water	River Clydach	Longford Road Neath Abbey CSO	14	32	99.8
Dwr Cymru Welsh Water	Gnoll Brook	CSO 33 CIMLA ROAD CIMLA NEATH	12	31	98.9
Dwr Cymru Welsh Water	River Dulais	CSO Outside Visitor Centre, Aberdulais	7	30	99.9
Dwr Cymru Welsh Water	Tennant Canal	Church Road CSO Church Road Neath	7	26	99.9
Dwr Cymru Welsh Water	River Neath	HEOL ILLTYD CSO BRYNCOCH NPT	9	26	99.9
Dwr Cymru Welsh Water	River Clydach	Monastery Road Cso (Cso 35) Neath	14	20	86.8
Dwr Cymru Welsh Water	Hollins Clough Ditch	CSO 9 CIMLA COMMON CIMLA NEATH	6	17	99.9
Dwr Cymru Welsh Water	Eastland Brook	St Joseph's Church CSO	15	17	99.9
Dwr Cymru Welsh Water	Neath Canal	Park Street CSO Park Street Tonna	10	4	99.9
Dwr Cymru Welsh Water	Neath - Conf With Nedd Fechan And Mellte To Tl	Adj Health Centre CSO, Dyfed Rd	5	1	96.6
Dwr Cymru Welsh Water	Tennant Cannal	CSO at R/O 38 Caenant Terrace, Neath	1	0	100
Dwr Cymru Welsh Water	Unnamed Stream To Tennant Canal	New Road Nursing Home CSO, Skewen	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. 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.

Analysing sewage pollution by the Water Industry

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