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Clwyd East

Polluted by sewage 1,317 times in 2025 lasting 7,038 hours

Monitoring was disabled in some locations, so could be more

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

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Live data for Clwyd East in 2026

So far this year (as of 18 May 2026, 12:00) there has been 4,633 hours of sewage overflows, from 85 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s

Totals for Clwyd East in 2025

78 Sites polluted by Dwr Cymru Welsh Water
1,317 sewage dumps
7,038 hours duration
That's 9.78 months. On average 3.6 times a day

Change Over Time

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Clwyd East 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 87 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 River Dee LLANGOLLEN WWTW 50 455 99.9
Dwr Cymru Welsh Water River Glanffyddion DYSERTH WWTW 34 450 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 Maescoed Drain TALACRE STATION ROAD PS 25 167 99.6
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 Sw System DISCHARGE B 14 FFORDD DDYFRDWY 10 109 99
Dwr Cymru Welsh Water River Alyn CSO Mynydd Isa Chambers Lane/Mercia Drive Nr 2 48 102 79.3
Dwr Cymru Welsh Water Prestatyn Gutter PRESTATYN SPS MARINE RD EAST 15 93 99.9
Dwr Cymru Welsh Water Glanfyddian Stream LOWER DYSERTH PS 17 86 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 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 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 Nant Y Flint PENTRE HALKYN SPS 10 45 99.9
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 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 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 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 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 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 River Alyn Mold Gas Lane CSO 10 5 99.7
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 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 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 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

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.

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