It's a Dirty Business

Watch Channel 4's documentary about the state of the water industry.

Clwyd North - 2025 Sewage

Polluted by sewage 2,676 hours in 2025

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

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View Annual Sewage Data

You're looking at the totals that we have calculated for sewage in Clwyd North for 2025. It is an estimate, based on very poor quality live data from the Water Companies. This may not align with the 'official' reported sewage values from the water companies, which is reported in April following then end of the year - so 2025 numbers are reported in April 2026.

What's a potential overflow? If the CSO goes 'Offline' while its Overflowing, we don't know if it stopped overflowing until we get a 'Stop' event.

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Your local MP is Gill German (Labour) - Find out more about their interests, donors, and voting at They Work For You

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Constituencies near Clwyd North

Daily Data

Jan - 0 hours
Feb - 96 hours
Mar - 9 hours
Apr - 10 hours
May - 62 hours
Jun - 132 hours
Jul - 15 hours
Aug - 2 hours
Sept - 526 hours
Oct - 57 hours
Nov - 1,053 hours
Dec - 709 hours
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Totals so far

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Offline/Potential Pollution
Dwr Cymru Welsh Water Ganol WwTW Storm Overflow Coastal waters - Penrhyn Bay 82 575 h 38m -
Dwr Cymru Welsh Water Pensarn Storm Overflow Coastal Waters - Pensarn Beach 50 398 h 45m -
Dwr Cymru Welsh Water Denbigh WwTW Storm Overflow River Clwyd 26 316 h 30m -
Dwr Cymru Welsh Water Church Road Rhos-on-Sea Storm Overflow Coastal Waters - Penrhyn Bay 39 190 h 7m -
Dwr Cymru Welsh Water Kinmel Bay WwTW Storm Overflow Coastal Water - Liverpool Bay 23 176 h 30m -
Dwr Cymru Welsh Water Llawr Pentre Abergele Road Storm Overflow Nant Y Ffynnon 13 102 h 50m -
Dwr Cymru Welsh Water Bodelwyddan Storm Tanks Storm Overflow Bodelwyddan Drain 18 97 h 45m -
Dwr Cymru Welsh Water Henllan WwTW Storm Overflow Afon Meirchion 47 74 h 30m -
Dwr Cymru Welsh Water East of Station Road Colwyn Bay Storm Overflow Colwyn Bay 9 68 h 20m -
Dwr Cymru Welsh Water Towyn Storm Overflow Coastal Waters 11 59 h 15m -
Dwr Cymru Welsh Water Llandulas Storm Overflow Coastal Water - Liverpool Bay 13 58 h 15m -
Dwr Cymru Welsh Water Denbigh Ruthin Road Storm Overflow Afon Ystrad 20 51 h 30m -
Dwr Cymru Welsh Water Plas Yn Green Storm Overflow Tributary of the Clwyd 9 48 h 15m -
Dwr Cymru Welsh Water Beach Road Old Colwyn Storm Overflow Coastal waters - Colwyn Bay 14 46 h 30m -
Dwr Cymru Welsh Water Rhuddlan WwTW Storm Overflow River Clwyd 14 45 h 22m -
Dwr Cymru Welsh Water High Street St Asaph Storm Overflow River Clwyd 10 44 h 30m -
Dwr Cymru Welsh Water Marine Lake Storm Overflow Coastal Waters - Irish Sea 6 44 h 30m -
Dwr Cymru Welsh Water Towyn Road Storm Overflow Ffynnon Y Ddol 6 36 h 44m -
Dwr Cymru Welsh Water Beacons Road and Grove Road Denbigh Storm Overflow Henllan Brook 6 36 h 17m -
Dwr Cymru Welsh Water Roe Parc St Asaph Storm Overflow River Elwy 7 30 h 14m -
Dwr Cymru Welsh Water Rhyl Coast Road Storm Overflow The Rhyl Cut 5 29 h 43m -
Dwr Cymru Welsh Water Panton Hall Denbigh Storm Overflow Henllan Brook 24 27 h 30m -
Dwr Cymru Welsh Water Trefnant Storm Overflow Unnamed Drain leading to Afon Clwyd 4 25 h 25m -
Dwr Cymru Welsh Water Rhuddlan Storm Overflow Tidal Estuary of Afon Clwyd 5 20 h -
Dwr Cymru Welsh Water Maes Y Llan Storm Overflow Ffynnon Y Ddol 3 17 h 15m -
Dwr Cymru Welsh Water Dalar Wen Denbigh Storm Overflow Henllan Brook 14 12 h 2m -
Dwr Cymru Welsh Water Min Y Don Woodland Storm Overflow Unnamed Tributary of Colwyn Bay 19 11 h 41m -
Dwr Cymru Welsh Water Westbourne Grove Storm Overflow Coastal Waters - Irish Sea 4 6 h 58m -
Dwr Cymru Welsh Water Tan Y Foel Rhyd Y Foel Storm Overflow Afon Dulas 5 5 h 45m -
Dwr Cymru Welsh Water Berth Glyd Storm Overflow Tributary of Afon Gele 5 4 h 57m -
Dwr Cymru Welsh Water Clifton Park Road Rhyl Storm Overflow 1 Rhyl Cut 2 3 h 41m -
Dwr Cymru Welsh Water Clifton Park Road Rhyl Storm Overflow 2 Rhyl Cut 1 3 h 30m -
Dwr Cymru Welsh Water Ffordd Ffynnon Rhuddlan Storm Overflow Afon Ffyddion 1 2 h 29m -
Dwr Cymru Welsh Water Marine Road Colwyn Bay Storm Overflow Colwyn Bay 5 1 h 30m -
Dwr Cymru Welsh Water Abbey Road Denbigh Storm Overflow Henllan Brook 1 0 h 30m -
Dwr Cymru Welsh Water Foryd Road and Dinas Avenue Kimmel Bay Overflow Kinmel Bay Drain 1 0 h 29m -
Dwr Cymru Welsh Water Brondyffyn Storm Overflow Nant Padrig 1 0 h 29m -
Dwr Cymru Welsh Water Maes Mathonwy Denbigh Storm Overflow River Dee 1 0 h 15m -
Dwr Cymru Welsh Water Abergele Road Storm Overflow Colwyn Bay 0 0 h -

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.