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Area of Outstanding Natural Beauty

Gower - 2025 Sewage

Polluted by sewage 4,065 hours in 2025

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

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Totals for 2025

Sewage4,065 hours
Monitoring offline0 hours
Potential pollution0 hours
Storm overflows25

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Sewage pollution map of Gower, an Area of Outstanding Natural Beauty, showing where sewage is discharged
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Daily Data - when it rained, and when they spilled

Square = rainfall none → heavy
Drop = sewage minutes → all day
Potential pollution Monitoring offline
Jan - 0 hours
Feb - 325 hours
Mar - 48 hours
Apr - 199 hours
May - 8 hours
Jun - 127 hours
Jul - 2 hours
Aug - 24 hours
Sept - 482 hours
Oct - 336 hours
Nov - 678 hours
Dec - 1,817 hours
Daily data is experimental and data is not guaranteed to be accurate. Please inform us of any issue, we will fix.
We don't have rainfall data for Gower - the Welsh AONBs and the Isles of Scilly have no nearby rainfall station, so only sewage is shown. If you know where to source it please let us know!

Storm overflows in and around Gower

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Offline/Potential Pollution
Dwr Cymru Welsh Water Mumbles Knab Rock Storm Overflow Estuarial Waters of Swansea Bay 101 1,375h 13m -
Dwr Cymru Welsh Water Reynoldston WwTW Storm Overflow Burry Pill 59 722h 20m -
Dwr Cymru Welsh Water Scurlage Overflow Tributary of Burry Pill 20 377h 59m -
Dwr Cymru Welsh Water Cwm Ivy Overflow Burry Pill 22 293h 59m -
Dwr Cymru Welsh Water Chapel Road Crofty Storm Overflow Morlais River 39 246h 46m -
Dwr Cymru Welsh Water Llanrhidian PS Overflow Estuary 37 196h 42m -
Dwr Cymru Welsh Water Bishopston WwTW Storm Overflow Coastal Waters - Brandy Cove 17 184h 25m -
Dwr Cymru Welsh Water Gower Road Upper Killay Storm Overflow River Clun 21 144h 53m -
Dwr Cymru Welsh Water Frogmore Storm overflow Oxwich Marsh Stream 27 130h 54m -
Dwr Cymru Welsh Water Llangennith Hillend Storm Overflow Unnamed Stream 22 97h 3m -
Dwr Cymru Welsh Water Parkmill Overflow Mill Leat 26 94h 32m -
Dwr Cymru Welsh Water Rhossili WwTW Overflow Carmarthen Bay 18 63h 2m -
Dwr Cymru Welsh Water Promenade Terrace Swansea Storm Overflow Swansea Bay 9 54h 50m -
Dwr Cymru Welsh Water Pennard Overflow Ilston Stream 5 46h 45m -
Dwr Cymru Welsh Water Hen Parc Lane Overflow Unnamed Tributary of the Clyne River 10 26h 57m -
Dwr Cymru Welsh Water Overton WwTW Storm Overflow Coastal Waters - Overton Mere 1 3h 15m -
Dwr Cymru Welsh Water Limeslade Overflow Limeslade Bay 6 2h -
Dwr Cymru Welsh Water Mayals Road Storm Overflow Swansea Bay 3 1h 57m -
Dwr Cymru Welsh Water Langland Bay Swansea Overflow Langland Bay 1 1h 27m -
Dwr Cymru Welsh Water Cheriton Overflow Burry Pill 0 0h -
Dwr Cymru Welsh Water Bryn Y Mor Road Storm Overflow Pennard Pill 0 0h -
Dwr Cymru Welsh Water The Nook Oxwich Storm Overflow Oxwich Marsh Stream - headwaters to tidal limit 0 0h -
Dwr Cymru Welsh Water Unknown Unknown 0 0h -
Dwr Cymru Welsh Water Bishopston Overflow River Teifi 0 0h -
Dwr Cymru Welsh Water Bae Langland Swansea Overflow Langland Bay 0 0h -

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.

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Analysing sewage pollution by the Water Industry

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© 2020-2025 Top-Of-The-Poops CC-BY-SA 4.0,
© Openstreetmap contributors, Contains OS data © Crown copyright and database right 2021-2025,
Contains Water UK National Storm Overflow Hub Data CC-BY-SA 4.0 and analysis © 2025 Top-Of-The-Poops

Some data reproduced under Open Government Licence

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