Top of the Poops | Senedd Constituency Sewage Map | Clwyd

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Totals for Clwyd in 2025

115 Sites polluted by Dwr Cymru Welsh Water

1,982 sewage dumps

10,415 hours duration

That's 1.21 years. On average 5.4 times a day

Change Over Time

Senedd Constituencies near Clwyd

Westminster Constituencies within Clwyd

To see live data by overflow, go to the Westminster Constituency, then 'live data'

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Sewage pollution map of Clwyd: 10,415 hours in 2025

Sewage pollution map of Clwyd: 10,415 hours in 2025

Pollution Summary 2025

Here are all the reported sewage overflow totals for Clwyd 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 constituency 1 of the total 128 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway locations had reporting enabled for less than half the year. Of these 1 had zero reporting.

Company	Waterway	Site	Sewage Dumps	Duration (Hours)	Reporting %
Dwr Cymru Welsh Water	River Clwyd	RUTHIN STW (FINAL)	93	1,262	99.9
Dwr Cymru Welsh Water	Coastal Waters	PENSARN SPS ABERGELE STORM	71	606	99.9
Dwr Cymru Welsh Water	River Clwyd	DENBIGH WWTW	57	541	99
Dwr Cymru Welsh Water	River Dee	LLANGOLLEN WWTW	50	455	99.9
Dwr Cymru Welsh Water	River Glanffyddion	DYSERTH WWTW	34	450	99.9
Dwr Cymru Welsh Water	Coastal Waters - Liverpool Bay	RHYL (KINMEL BAY) WWTW KINMEL BAY	35	410	99.9
Dwr Cymru Welsh Water	River Alun	Leeswood Transfer SPS	40	404	99.9
Dwr Cymru Welsh Water	River Alyn	MOLD WwTW	56	359	99.8
Dwr Cymru Welsh Water	Unnamed W/C	HOLYWELL STRAND WALK NR STRAND	13	263	99.7
Dwr Cymru Welsh Water	Gutter Fawr	LLANASA PS CSO / EO	14	208	99.9
Dwr Cymru Welsh Water	River Cylflymen	CSO at THE REAR OF THE TANNERY	54	208	99.9
Dwr Cymru Welsh Water	River Camddwr	GWYDDELWERN PS. - EMERGENCY SC	15	202	99.9
Dwr Cymru Welsh Water	River Alyn	LLANARMON-YN-IAL STW	59	177	99.9
Dwr Cymru Welsh Water	Bodelwyddan Drain	BODELWYDDAN MAIN SPS	27	174	99.9
Dwr Cymru Welsh Water	Maescoed Drain	TALACRE STATION ROAD PS	25	167	99.6
Dwr Cymru Welsh Water	Penrhyn Bay	CHURCH RD PS CHURCH RD RHOS ON SEA	45	158	87.8
Dwr Cymru Welsh Water	Dwr Ial	LLANFAIR DC STW	38	147	99.9
Dwr Cymru Welsh Water	Tan Lan Drains	CSO at Tanlan Bach Pumping Station	8	140	99.9
Dwr Cymru Welsh Water	River Dee	Abbey Road CSO	44	139	99.9
Dwr Cymru Welsh Water	Ffynnongroew Drain	FFYNNON WEST PS	9	137	99.9
Dwr Cymru Welsh Water	New Drain	STATION ROAD PS TALACRE	14	129	99.9
Dwr Cymru Welsh Water	River Alyn	CSO at Mynydd Isa Wylfa Hill	39	127	99.9
Dwr Cymru Welsh Water	Culverted Of Dee	MOSTYN DOCKS CAR PARK - SSO	9	124	99.9
Dwr Cymru Welsh Water	S W Sewer	MYNYDD ISA WATS DYKE AVE PS	23	118	99.9
Dwr Cymru Welsh Water	River Meirchion	HENLLAN STW	59	113	99.9
Dwr Cymru Welsh Water	Sw System	DISCHARGE B 14 FFORDD DDYFRDWY	10	109	99
Dwr Cymru Welsh Water	Liverpool Bay	LLANDDULAS PS LLANDULAS	20	104	99.9
Dwr Cymru Welsh Water	Colwyn Bay	Old Colwyn Queens Road CSO	15	103	99.8
Dwr Cymru Welsh Water	River Alyn	CSO Mynydd Isa Chambers Lane/Mercia Drive Nr 2	48	102	79.3
Dwr Cymru Welsh Water	Nant Y Flynnon	Llawr Pentre CSO (Near Beach Road)	19	102	99.8
Dwr Cymru Welsh Water	Coastal Waters	COVENTRY CAMP SPS STORM	18	100	99.9
Dwr Cymru Welsh Water	Coastal Waters/Irish Sea	WESTBOURNE AVENUE PUMPING STATION	11	97	99.9
Dwr Cymru Welsh Water	Prestatyn Gutter	PRESTATYN SPS MARINE RD EAST	15	93	99.9
Dwr Cymru Welsh Water	River Ystrad	RUTHIN ROAD ROUNDABOUT CSO DENBIGH	28	93	99.9
Dwr Cymru Welsh Water	Clwyd	Plas Yn Green CSO	15	90	99.9
Dwr Cymru Welsh Water	Glanfyddian Stream	LOWER DYSERTH PS	17	86	99.9
Dwr Cymru Welsh Water	Colwyn Bay	BEACH ROAD CSO BEACH RD COLWYN BAY	27	85	99.9
Dwr Cymru Welsh Water	Northop Brook	Northop Wastewater Treatment Works Settled Storm	6	82	100
Dwr Cymru Welsh Water	Surface Water System	MYNYDD ISA MOLD ROAD/MERCIA DR CSO	34	81	97.2
Dwr Cymru Welsh Water	Llanerchymor Gutter	MOSTYN NEAR FUN SHIP - SSO	18	80	96.9
Dwr Cymru Welsh Water	Prestatyn Gutter	Meliden Holding Tank - CSO	14	77	99.8
Dwr Cymru Welsh Water	River Alun	Mynydd Isa Chambers lane/Mercia Drive CSO	36	76	99.4
Dwr Cymru Welsh Water	River Clwyd	CSO AT GAMEKEEPER PH, LOWER STREET, ST ASAPH	12	73	99.9
Dwr Cymru Welsh Water	River Elwy	St Asaph Roe Parc CSO	11	71	99.7
Dwr Cymru Welsh Water	Ffynnon Y Ddol Channel	MAES Y LLAN CSO	10	69	87.1
Dwr Cymru Welsh Water	Black Brook	Mold Bryn Awelon - CSO	12	68	99.9
Dwr Cymru Welsh Water	River Wheeler	CROOKED HORN SPS NO 3 BRYNFORD	21	63	99.6
Dwr Cymru Welsh Water	Northop Brook	NORTHOP WASTEWATER TREATMENT WORKS	12	59	99.9
Dwr Cymru Welsh Water	Alun	Llanferres SPS	6	59	99.8
Dwr Cymru Welsh Water	Dee	HAND HOTEL GARDENS CSO	44	58	99.9
Dwr Cymru Welsh Water	Wepre Brook	Northop Hall SPS	14	58	99.9
Dwr Cymru Welsh Water	Sluice House Gutter	LLANASA WWTW COLLIERY ROAD TANLAN	5	55	100
Dwr Cymru Welsh Water	Ffynnon Y Ddol Channel	KERFOOT CARAVAN PARK CSO	7	53	99.9
Dwr Cymru Welsh Water	Henllan Brook	Panton Hall CSO	34	50	99.9
Dwr Cymru Welsh Water	River Dee	GREENFIELD IND EST NO 1 HOLYWELL	9	49	98.9
Dwr Cymru Welsh Water	Unnamed W/C	HOLYWELL PEN Y MAES RD/PEN Y M	56	47	98.8
Dwr Cymru Welsh Water	Rhyl Cut	Coast Road PS Rhyl	9	47	99.7
Dwr Cymru Welsh Water	Nant Y Flint	PENTRE HALKYN SPS	10	45	99.9
Dwr Cymru Welsh Water	River Clwyd	Rhuddlan Wastewater Treatment Works Storm Tanks	11	42	99.6
Dwr Cymru Welsh Water	Marsiandwr	TAI TREVOR PS LLANNERCHYMOR	13	37	99.9
Dwr Cymru Welsh Water	River Dee	WEST STREET CSO	11	36	99.9
Dwr Cymru Welsh Water	River Gele	Berthglyd Combined Sewer Overflow	10	36	99.7
Dwr Cymru Welsh Water	River Alyn	Bridge Inn Pumping Station	12	36	90.1
Dwr Cymru Welsh Water	River Dee	PEN Y MAES PUMPING STATION	13	35	99.9
Dwr Cymru Welsh Water	Henllan Brook	Dalar Wen Sewage Pumping Station	30	33	99.9
Dwr Cymru Welsh Water	R Dee	RHUDDLAN NETWORK TANK CSO	5	31	99.8
Dwr Cymru Welsh Water	River Alyn	PONTBLYDDYN NO 1 PUMPING STATION	3	27	99.9
Dwr Cymru Welsh Water	Culverted Of Dee	MOSTYN ARMS PS MOSTYN	4	26	99.8
Dwr Cymru Welsh Water	An Open Discharging To Prestatyn Gutter	Dyserth Bay SPS	5	23	99.6
Dwr Cymru Welsh Water	River Clwyd	RHUDDLAN WWTW FINAL	6	22	99.6
Dwr Cymru Welsh Water	River Dee Estuary	DISCHARGE A 14 FFORDD DDYFRDWY	36	22	99.7
Dwr Cymru Welsh Water	River Alyn	CSO at Mold Gladstone St/Glan Yr Afon Rd	24	21	99.5
Dwr Cymru Welsh Water	Holywell Stream	GREENFIELD PARENT CSO HOLYWELL	19	21	98.8
Dwr Cymru Welsh Water	Dee Estuary	GREENFIELD WWTW (STW) GREENFIELD	13	18	99.9
Dwr Cymru Welsh Water	Prestatyn Gutter	CORONATION GARDENS PS	6	18	66.4
Dwr Cymru Welsh Water	Greenfield Valley	CSO Adjacent A548 Road Bridge	13	16	99.9
Dwr Cymru Welsh Water	River Alyn	CSO at Mold Committee's Sewerage System	17	14	99.9
Dwr Cymru Welsh Water	River Alun	LLANDEGLA CSO , ,	5	14	99.9
Dwr Cymru Welsh Water	Tref Y Nant Brook	Trefor Isaf - CSO	16	14	99.9
Dwr Cymru Welsh Water	Colwyn Bay	Old Colwyn Beach Rd	37	12	92.7
Dwr Cymru Welsh Water	Gutter Fawr	ARGOED PS	5	12	99.9
Dwr Cymru Welsh Water	Overflow Via Sewerage System S	PRESTATYN PURBECK PS	7	11	99.9
Dwr Cymru Welsh Water	Prestatyn Gutter	PRESTATYN MELIDEN ROAD - SSO	9	11	99.6
Dwr Cymru Welsh Water	Henllan Brook	Frongoch (Rear of Magistrates Court) CSO	5	9	66.9
Dwr Cymru Welsh Water	Unnamed Drain To Ricer Clwyd	Trefnant Village CSO	6	8	99.6
Dwr Cymru Welsh Water	Coastal Waters/Irish Sea	WESTBOURNE AVENUE CSO NO.2	5	8	99.5
Dwr Cymru Welsh Water	River Dulas	Rhyd Y Foel PS	6	7	99.9
Dwr Cymru Welsh Water	Nant Brook Via A Ditch	Leeswood Bethania SPS	3	7	99.9
Dwr Cymru Welsh Water	Rhyl Cut	MARINE PARK PS	3	6	99.9
Dwr Cymru Welsh Water	Overflow Via Sewerage System S	PRESTATYN MALL PS	4	6	99.9
Dwr Cymru Welsh Water	Kinmel Bay Drain	FORYD RD EMERGENCY KINMEL BAY ,	2	6	100
Dwr Cymru Welsh Water	River Alyn	Mold Gas Lane CSO	10	5	99.7
Dwr Cymru Welsh Water	Nant Padrig	Brondyffyn CSO	4	4	99.8
Dwr Cymru Welsh Water	River Dee Via Surface Water Sewer	BERWYN STREET CSO	5	3	99.5
Dwr Cymru Welsh Water	River Alyn	Mold Old St Davids Lane/Bridge St CSO	4	3	99.6
Dwr Cymru Welsh Water	Rhyl Cut	CLIFTON PARK CSO NO.2	1	3	100
Dwr Cymru Welsh Water	River Ffyddion	Fford Aber CSO	3	2	99.7
Dwr Cymru Welsh Water	Rhyl Cut	CLIFTON PARK ROAD CSO NO.1	1	2	86.7
Dwr Cymru Welsh Water	River Alyn	Mold Football Club Drice CSO	4	2	99.6
Dwr Cymru Welsh Water	River Dee	Royal Hotel CSO	3	1	99.9
Dwr Cymru Welsh Water	River Dee	Llangollen East St CSO	5	1	99.7
Dwr Cymru Welsh Water	Surface Water Sewer	Northop Hall CSO	2	1	89.5
Dwr Cymru Welsh Water	River Dee	Llangollen Chruch St CSO	2	0	97.2
Dwr Cymru Welsh Water	Nant Y Flint	Lygan-Y-Wern Pentre Halkyn SPS	3	0	99.8
Dwr Cymru Welsh Water	River Alyn	Mold Argoed CSO	3	0	96.1
Dwr Cymru Welsh Water	River Dee	Llangollen Riverside Park Printing Works CSO	2	0	99.8
Dwr Cymru Welsh Water	River Dee	Llangollen Victoria Prom Riverside CSO	2	0	100
Dwr Cymru Welsh Water	River Wheeler	YSCEIFIOG CSO	2	0	99.9
Dwr Cymru Welsh Water	Henllan Brook Via Surface Water Sewer	Henllan Street CSO	2	0	99.7
Dwr Cymru Welsh Water	Unnamed W/C	GREENFIELD A548 NR ABBEY MILL	1	0	99.7
Dwr Cymru Welsh Water	Unnamed W/C	GWESPYR OLD STW - SSO	1	0	91.5
Dwr Cymru Welsh Water	River Dee	MARSH FARM PUMPING STATION	1	0	99.1
Dwr Cymru Welsh Water	River Dee	Park Avenue CSO	1	0	99.9
Dwr Cymru Welsh Water	River Y Garth	SWN Y DWR CSO	1	0	58.1
Dwr Cymru Welsh Water	Henllan Brook	Abbey Road CSO	1	0	97.7
Dwr Cymru Welsh Water	Clwyd	Llandyrnog WWTW	0	0	99.9
Dwr Cymru Welsh Water	River Alyn	Mold Bryn Coch Lane/Lon Y Parc CSO	0	0	99.5
Dwr Cymru Welsh Water	Wheeler	Nannerch SPS	0	0	96
Dwr Cymru Welsh Water	Unnamed W/C	PEN Y FFORDD ADJ PEN Y FFORDD	0	0	63.3
Dwr Cymru Welsh Water	Nant Mill Stream	PRESTATYN NANT HALL PS NANT HALL RO	0	0	99.9
Dwr Cymru Welsh Water	Railway Ditch	PRESTATYN NANT HALL PS NANT HALL RO	0	0	99.9
Dwr Cymru Welsh Water	Overflow Via Sewage System Sur	PRESTATYN NANT PS	0	0	99.9
Dwr Cymru Welsh Water	Prestatyn Gutter	PRESTATYN SEVEN SISTERS ROAD SPS	0	0	99.9
Dwr Cymru Welsh Water	Dolfechlas Brook	RHYDYMWYN STW	0	0	0
Dwr Cymru Welsh Water	Coastal Waters - Irish Sea	LLYSFAEN	0	0	99.7
Dwr Cymru Welsh Water	Colwyn Bay	MARINE RD CSO MARINE RD COLWYN BAY	0	0	99.9
Dwr Cymru Welsh Water	Nant Y Ffynnon	PS OFF LLANELION ROAD COLWYN BAY	0	0	99.9
Dwr Cymru Welsh Water	Rhyl Cut	TY NEWYDD PUMPING STATION	0	0	99.9

It's a Dirty Business

Clwyd

Polluted by sewage 1,982 times in 2025 lasting 10,415 hours - That's 1.21 years!

Monitoring was disabled in some locations, so could be more

Clwyd

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Totals for Clwyd in 2025

115 Sites polluted by Dwr Cymru Welsh Water

Change Over Time

Senedd Constituencies near Clwyd

Westminster Constituencies within Clwyd

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Pollution Summary 2025

Data Sources & Accuracy

Media Queries

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It's a Dirty Business

Clwyd Polluted by sewage 1,982 times in 2025 lasting 10,415 hours - That's 1.21 years! Monitoring was disabled in some locations, so could be more

Clwyd

Select Another Constituency

Totals for Clwyd in 2025

115 Sites polluted by Dwr Cymru Welsh Water

Change Over Time

Senedd Constituencies near Clwyd

Westminster Constituencies within Clwyd

Take Action

We need your support!

Pollution Summary 2025

Data Sources & Accuracy

Media Queries

Please Support Us

Clwyd

Polluted by sewage 1,982 times in 2025 lasting 10,415 hours - That's 1.21 years!

Monitoring was disabled in some locations, so could be more