Area of Outstanding Natural Beauty

Gower

Polluted by sewage 523 times in 2025 - lasting 5,072 hours

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Contains OS Data © Crown copyright & database right 2021-2024
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Totals for Gower in 2025

18 Sites polluted by Dwr Cymru Welsh Water
523 sewage dumps
5,072 hours duration
Sewage pollution map of Gower
Sewage pollution map of Gower, showing 523 overflows in 2025
That's 7.04 months. On average 1.4 times a day

How does Gower compare?

Gower was the #16 most polluted Area of Outstanding Natural Beauty in England & Wales, by duration of sewage overflows, as reported by the water companies

Why the change?

Storm overflows spill when it rains, and 2025 was drier than 2024 - 90% of average annual rainfall against 105%.

So much of any drop is weather, not fixed pipes. The live page shows rainfall and sewage side by side, day by day.

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Constituencies

Pollution Summary 2025

Here are all the reported sewage overflow totals for Gower in 2025.

How we count, and how accurate it is

A CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway counts towards Gower when it sits inside the designated area, or within 200 metres of its boundary. An overflow close to two AONBs is counted in both.

We use data from the water companies, but we are seeing many anomalies that make us believe that location information is quite poor. The situation is likely far worse than reported here.

Other CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s just outside the 200 metre boundary are not counted, though they may still affect water quality inside the area.

Company Waterway Site Sewage Dumps Duration (Hours) Reporting %
Dwr Cymru Welsh Water Estuarial Waters Of Swansea Ba CSO and EO at Knab Rock Sewage Pumping Station 111 1,537 99.9
Dwr Cymru Welsh Water Burry Pill Reynoldson WwTW Settled Storm 34 810 100
Dwr Cymru Welsh Water Burry Pill Reynoldston Wastewater Treatment Works 65 794 99.8
Dwr Cymru Welsh Water Burry Pill Scurlage SPS 24 400 99.9
Dwr Cymru Welsh Water Burry Pill LLANMADOC P.S.NO 2 EMERGEN 24 294 99.8
Dwr Cymru Welsh Water Estuary LLANRHIDIAN PS EMERGENCY 73 254 99.9
Dwr Cymru Welsh Water Coastal Water At Brandy Cove Bishopston Wastewater Treatment Works 18 210 99.8
Dwr Cymru Welsh Water Morlais River Settled Storm and Emergency Overflow at New Crofty C SPS 30 178 95.2
Dwr Cymru Welsh Water Clyne River Railway Inn SPS, Killay 21 146 99.9
Dwr Cymru Welsh Water Swansea Bay Swansea Promenade Terrace CSO 13 110 97.5
Dwr Cymru Welsh Water Unnamed Stream HILLEND LLANGENNITH P.S. SSO 25 102 99.9
Dwr Cymru Welsh Water Illston Stream Killy Willy Pennard Sewage Pumping Station 15 93 99.8
Dwr Cymru Welsh Water Clyne River HEN PARC LANE PUMPING STATION 21 69 97.6
Dwr Cymru Welsh Water Sea CSO and EO at Knelston Pumping Station 38 63 91.6
Dwr Cymru Welsh Water Coastal Waters At Overton Mere Overton (Gower) Wastewater Treatment Works 1 3 99.8
Dwr Cymru Welsh Water Limeslade Bay LIMESLADE PUMPING STATION SWANSEA 5 1 99.8
Dwr Cymru Welsh Water Langland Bay LANGLAND SPS LANGLAND SWANSEA 3 1 100
Dwr Cymru Welsh Water Swansea Bay Storm Overflow at Outfall G via CSO 16 2 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.