Porthaethwy

Polluted by sewage 330 times in 2025 lasting 2,760 hours

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Totals for Porthaethwy in 2025

6 Sites polluted by Dwr Cymru Welsh Water
330 sewage dumps
2,760 hours duration
Sewage pollution map of Porthaethwy
Sewage pollution map of Porthaethwy: 2,760 hours in 2025
That's 3.83 months. 6.3 times a week, on average

Change Over Time

Constituency for Porthaethwy

Nearby Constituencies

Waterways in Porthaethwy

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Porthaethwy 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 Menai Strait LLANDEGFAN (MENAI) PUMPING STATION 85 1,707 93.7
Dwr Cymru Welsh Water Menai Strait PS NO 1 (FAELOG CAUSEWAY) (EMERGENC 60 338 99.9
Dwr Cymru Welsh Water Menai Strait PS NO 1 (FAELOG CAUSEWAY) (EMERGENC 60 338 99.9
Dwr Cymru Welsh Water Menai Strait PS NO 3 (SUSPENSION BRIDGE) (EMERGE 60 185 99.8
Dwr Cymru Welsh Water Menai Strait PS NO 3 (SUSPENSION BRIDGE) (EMERGE 60 185 99.8
Dwr Cymru Welsh Water Menai Strait COLEG NORMAL SEWAGE PUMPING STATION 5 6 99.9
Dwr Cymru Welsh Water Menai Strait LLYN Y FELIN PS (EMERGENCY) 0 0 95.5
Dwr Cymru Welsh Water Menai Strait LLYN Y FELIN PS (EMERGENCY) , , 0 0 95.5
Dwr Cymru Welsh Water Menai Strait PS NO 2 (PORTH WRACH) (EMERGENCY) 0 0 99.8
Dwr Cymru Welsh Water Menai Strait PS NO 2 (PORTH WRACH) (EMERGENCY) 0 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

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.