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Mid and South Pembrokeshire - 2025 Sewage

Polluted by sewage 53,569 hours in 2025 - That's 6.2 years

© OpenStreetMap contributors
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 Mid and South Pembrokeshire 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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Constituencies near Mid and South Pembrokeshire

Daily Data

Jan - 0 hours
Feb - 1,400 hours
Mar - 340 hours
Apr - 2,442 hours
May - 67 hours
Jun - 456 hours
Jul - 69 hours
Aug - 139 hours
Sept - 3,240 hours
Oct - 2,180 hours
Nov - 21,223 hours
Dec - 21,877 hours
Daily data is experimental and data is not guaranteed to be accurate. Please inform us of any issue, we will fix.
Please note: We don't have rainfall data for Wales. If you know where to source it please let us know!
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Totals so far

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Offline/Potential Pollution
Dwr Cymru Welsh Water Langdon WwTW Storm Overflow River Cresswell 135 2,547h 53m -
Dwr Cymru Welsh Water Tavernspite WwTW Storm Overflow Afon Cwm-Waun-Gron 112 2,172h 42m -
Dwr Cymru Welsh Water Marloes WwTW Storm Overflow Unnamed Watercourse 158 1,967h 44m -
Dwr Cymru Welsh Water Wolfcastle WwTW Storm Overflow Afon Anghof 185 1,889h 50m -
Dwr Cymru Welsh Water Waterston WwTW Storm Overflow Hazelbeach Stream 185 1,831h 13m -
Dwr Cymru Welsh Water Cosheston WwTW Storm Overflow Cosheston Pill 130 1,831h 9m -
Dwr Cymru Welsh Water Carew WwTW Storm Overflow Carew River 118 1,740h 13m -
Dwr Cymru Welsh Water Wolfsdale Storm Overflow Unnamed Tributary of Western Cleddau 91 1,664h 10m -
Dwr Cymru Welsh Water Clarbeston Road Storm Overflow Deepford Brook 83 1,654h 58m -
Dwr Cymru Welsh Water Keeston WwTW Storm Overflow Knock Brook 103 1,647h 17m -
Dwr Cymru Welsh Water Camrose WwTW Overflow Camrose Brook 155 1,562h 16m -
Dwr Cymru Welsh Water Letterston East Storm Overflow Tributary of Afon Anghof 79 1,431h 42m -
Dwr Cymru Welsh Water St Ishmaels WwTW Storm Overflow Monk Haven Stream 80 1,429h 29m -
Dwr Cymru Welsh Water Hayscastle Storm Overflow Western Cleddau 69 1,376h 16m -
Dwr Cymru Welsh Water Picton Place Storm Overflow Tidal Waters of the Western Cleddau 85 1,367h 39m -
Dwr Cymru Welsh Water Herbrandston WwTW Storm Overflow Estuarial Waters East of Sandy Haven 68 1,291h 15m -
Dwr Cymru Welsh Water Spittal WwTW Storm Overflow Tributary of Rudbaxton Water 92 1,282h 50m -
Dwr Cymru Welsh Water Letterston West WwTW Storm Overflow Western Cleddau 93 1,256h 19m -
Dwr Cymru Welsh Water Saundersfoot WwTW 1 Storm Overflow Coastal Waters - Saundersfoot 72 1,255h 19m -
Dwr Cymru Welsh Water Tenby WwTW Storm Overflow River Ritec 63 1,203h 48m -
Dwr Cymru Welsh Water St Davids WwTW Storm Overflow Coastal Waters - Porth Clais 55 969h 10m -
Dwr Cymru Welsh Water Dale WwTW Storm Overflow Milford Haven Waterway 72 924h 30m -
Dwr Cymru Welsh Water Clarbeston Road WwTW Storm Overflow Cartlett Brook 85 909h 16m -
Dwr Cymru Welsh Water Fleet Street No 2 Pennar Storm Overflow Pembroke River 57 896h 58m -
Dwr Cymru Welsh Water Narberth East Storm Overflow Tributary of Afon Marlais 63 887h 27m -
Dwr Cymru Welsh Water Steynton Road Storm Overflow Deadman's Lake Stream 44 881h 57m -
Dwr Cymru Welsh Water Wolfscastle Storm Overflow Afon Anghof 66 833h 16m -
Dwr Cymru Welsh Water Solva Storm Overflow Tidal River Solva 48 833h 5m -
Dwr Cymru Welsh Water Templeton WwTW Storm Overflow Ford's Lake 70 799h 30m -
Dwr Cymru Welsh Water Hundleton WwTW Storm Overflow Pembroke River 111 729h 4m -
Dwr Cymru Welsh Water Narberth West WwTW Storm Overflow Narberth Brook 77 717h 32m -
Dwr Cymru Welsh Water Park Road Lower Park Road Overflow River Ritec 47 705h 35m -
Dwr Cymru Welsh Water Nolton Haven Storm Overflow Tributary of Nolton Bay 41 666h 26m -
Dwr Cymru Welsh Water Angle Village Storm Overflow Milford Haven 58 588h 31m -
Dwr Cymru Welsh Water Angle WwTW Storm Overflow Angle Bay 29 572h 29m -
Dwr Cymru Welsh Water Merlins Bridge WwTW Storm Overflow Cleddau River 69 506h 1m -
Dwr Cymru Welsh Water Newgale WwTW Storm Overflow Newgale 32 486h 45m -
Dwr Cymru Welsh Water Llandewi Velfrey WwTW Storm Overflow Tributary of Pont Shan Brook 32 417h 11m -
Dwr Cymru Welsh Water Llangwm Orchard Row Overflow Llangwm Pill 46 408h 19m -
Dwr Cymru Welsh Water Milford Haven WwTW Settled Storm Overflow Milford Haven Waterway 50 380h 19m -
Dwr Cymru Welsh Water Burton Ferry WwTW Storm Overflow Estuarial Waters of Milford Haven Waterway 49 353h 1m -
Dwr Cymru Welsh Water Rosemarket WwTW Storm Overflow Tributary of Westfield Pill 41 346h 49m -
Dwr Cymru Welsh Water Oakridge Acres Overflow Afon Rhydeg 48 322h 10m -
Dwr Cymru Welsh Water Stackpole WwTW Storm Overflow Unnamed Tributary of Bosheston Lakes 33 321h -
Dwr Cymru Welsh Water Little Haven Overflow Little Haven Stream 26 318h 57m -
Dwr Cymru Welsh Water Broadmoor Storm Overflow Tributary of the Cresswell River 38 314h -
Dwr Cymru Welsh Water Tiers Cross WwTW Storm Overflow Tributary of Sandy Haven Pill 55 313h 27m -
Dwr Cymru Welsh Water Stackpole WwTW Settled Storm Overflow 2 Coastal Waters - Stackpole Quay 23 304h 45m -
Dwr Cymru Welsh Water Walton West WwTW Storm Overflow Swanswell Brook 18 275h 40m -
Dwr Cymru Welsh Water Water Street Pembroke Dock Storm Overflow Llanion Pill 50 247h 48m -
Dwr Cymru Welsh Water Bridge Hill Narberth Storm Overflow Narberth Brook 62 239h 14m -
Dwr Cymru Welsh Water Coombs Drive Storm Overflow Castle Pill 72 230h 35m -
Dwr Cymru Welsh Water Amroth Beach Storm Overflow Trelissey 25 218h 28m -
Dwr Cymru Welsh Water Hook WwTW Upper Level Storm Overflow Sprinkle Pill 61 211h 30m -
Dwr Cymru Welsh Water The Rath Storm Overflow Esturial Waters at the Rath, Milford Haven 79 202h 3m -
Dwr Cymru Welsh Water Honeyborough No 1 Storm Overflow Unnamed Tributary of Westfield Pill 19 201h -
Dwr Cymru Welsh Water Penycwm Overflow Tributary of Cwm Mawr stream 24 155h 57m -
Dwr Cymru Welsh Water Neyland PS Storm Overflow Milford Haven 32 153h 35m -
Dwr Cymru Welsh Water Bishop's Palace St David's Storm Overflow River Alun 31 151h 23m -
Dwr Cymru Welsh Water Western Way Pembroke Dock Storm Overflow Milford Haven 32 149h 1m -
Dwr Cymru Welsh Water Johnston WwTW Storm Overflow Unnamed Tributary of Merlins Brook 45 143h 48m -
Dwr Cymru Welsh Water Pit Street St David's Storm Overflow River Alun 29 140h 3m -
Dwr Cymru Welsh Water Perrots Road Island Storm Overflow Western Cleddau 45 117h 1m -
Dwr Cymru Welsh Water New Hedges Overflow Unnamed Stream 17 115h 59m -
Dwr Cymru Welsh Water The Promenade Neyland Storm Overflow Milford Haven Estuary 48 115h 1m -
Dwr Cymru Welsh Water New Road Begelly Storm Overflow River Cresswell 19 105h -
Dwr Cymru Welsh Water Crundale Storm Overflow Cartlett Brook 21 100h 4m -
Dwr Cymru Welsh Water Union Hill Storm Overflow Western Cleddau 62 94h 45m -
Dwr Cymru Welsh Water Quay Street Haverfordwest Storm Overflow Tidal Waters of the Western Cleddau 41 84h 47m -
Dwr Cymru Welsh Water Saundersfoot WwTW 2 Storm Overflow Saundersfoot Stream 29 82h 42m -
Dwr Cymru Welsh Water Milford Haven WwTW Storm Overflow Estuarial waters in Milford Haven Waterway 45 81h 37m -
Dwr Cymru Welsh Water Houghton Storm Overflow Westfield Pill 17 77h 44m -
Dwr Cymru Welsh Water Portfield Storm Overflow Western Cleddau 52 75h 39m -
Dwr Cymru Welsh Water Hook WwTW Low Level Storm Overflow Sprinkle Pill 19 71h 45m -
Dwr Cymru Welsh Water St Nicholas Crescent Storm Overflow Castle Pond 27 65h 51m -
Dwr Cymru Welsh Water Penally Storm Overflow Unnamed Watercourse 13 59h 4m -
Dwr Cymru Welsh Water Unknown Unknown 18 55h 10m -
Dwr Cymru Welsh Water Broad Haven South Storm Overflow Broadhaven Stream 15 49h 24m -
Dwr Cymru Welsh Water Milford Haven Lower Priory Storm Overflow River Hubberston Pill 14 44h 53m -
Dwr Cymru Welsh Water Neyland WwTW Storm Overflow Milford Haven Waterway 18 35h 45m -
Dwr Cymru Welsh Water Freshwater East WwTW Overflow Land Adjacent To Freshwater East Stream 6 33h 45m -
Dwr Cymru Welsh Water Milford Haven Pier Storm Overflow Esturial Waters - Hakin Point 25 32h 19m -
Dwr Cymru Welsh Water Lamack Vale Tenby Overflow Knightston Brook 12 26h 43m -
Dwr Cymru Welsh Water Pembroke Dock Sycamore Street Storm Overflow Tributary of Pembroke River 16 20h 41m -
Dwr Cymru Welsh Water Beach Hill Storm Overflow Castle Pill 31 20h 6m -
Dwr Cymru Welsh Water Milton Overflow Radford Pill 12 20h 1m -
Dwr Cymru Welsh Water Amroth Car Park Storm Overflow Colby Stream 6 20h -
Dwr Cymru Welsh Water Fleet Street No 1 Pennar Storm Overflow Cocheston Pill - headwaters to tidal limit 12 17h 27m -
Dwr Cymru Welsh Water Picton Road Neyland Storm Overflow Milford Haven Estuary 13 17h 16m -
Dwr Cymru Welsh Water Mill Bridge Pembroke Storm Overflow Castle Pond 18 15h 54m -
Dwr Cymru Welsh Water Kilgetty Storm Overflow Ford's Lake Stream 6 14h -
Dwr Cymru Welsh Water Saundersfoot Car Park Overflow Saundersfoot Stream 7 13h 38m -
Dwr Cymru Welsh Water Manorbier Storm Overflow Coastal Waters - Manorbier 3 13h -
Dwr Cymru Welsh Water St David's Cathedral St David's Storm Overflow River Alun 18 11h 32m -
Dwr Cymru Welsh Water Saundersfoot East Storm Overflow Saundersfoot Stream 5 8h 59m -
Dwr Cymru Welsh Water Unknown Unknown 2 7h -
Dwr Cymru Welsh Water Lamphey WwTW Storm Overflow River Pembroke 1 3h 30m -
Dwr Cymru Welsh Water Tenby Lifeboat Slip Storm Overflow Coastal Waters 2 2h 29m -
Dwr Cymru Welsh Water Walton West WwTW Overflow Swanswell Brook 4 1h 57m -
Dwr Cymru Welsh Water Pembroke Dock WwTW Storm Overflow Milford Haven Waterway 5 1h 57m -
Dwr Cymru Welsh Water Kensington Gardens Haverfordwest Storm Overflow St Martins Brook 2 0h 59m -
Dwr Cymru Welsh Water Saundersfoot West Storm Overflow Saundersfoot Stream 1 0h 57m -
Dwr Cymru Welsh Water Woodbine Terrace Pembroke Storm Overflow Lower Mill Pond 2 0h 31m -
Dwr Cymru Welsh Water Saundersfoot Valley Road Storm Overflow Saundersfoot Stream 1 0h 18m -
Dwr Cymru Welsh Water Valley Road Overflow Saundersfoot Stream 1 0h 15m -
Dwr Cymru Welsh Water Unknown Unknown 0 0h -
Dwr Cymru Welsh Water Pembroke Storm Overflow Estuarial Waters of Afon Pembroke 0 0h -
Dwr Cymru Welsh Water Unknown Unknown 0 0h -
Dwr Cymru Welsh Water Waterston WwTW Storm Overflow Hazelbeach Stream 0 0h -
Dwr Cymru Welsh Water Bridge Terrace Pembroke Storm Overflow Downstream Barrage/Pembroke River 0 0h -
Dwr Cymru Welsh Water Holyland Road Pembroke Storm Overflow Upper Mill Pond 0 0h -
Dwr Cymru Welsh Water The Glen Storm Overflow Stream above Beach 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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© 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

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