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Mid and South Pembrokeshire

Polluted by sewage 5,944 times in 2025 lasting 56,669 hours - That's 6.56 years!

Monitoring was disabled in some locations, so could be more

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

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Live data for Mid and South Pembrokeshire in 2026

So far this year (as of 6 Oct 2026, 07:45) there has been 34,810 hours of sewage overflows, from 112 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s - that's 4.03 years!

Totals for Mid and South Pembrokeshire in 2025

104 Sites polluted by Dwr Cymru Welsh Water
5,944 sewage dumps
56,669 hours duration
That's 6.56 years. On average 16.3 times a day

Change Over Time

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Sewage pollution map of Mid and South Pembrokeshire: 5,944 spills in 2025, lasting 56,669 hours, by Dwr Cymru Welsh Water
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Waterways in Mid and South Pembrokeshire

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Mid and South Pembrokeshire 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 constituency 1 of the total 114 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway locations had reporting enabled for less than half the year. Of these 1 had zero reporting.

Company Waterway Site Sewage Dumps Duration (Hours) Reporting %
Dwr Cymru Welsh Water River Cresswell LANGDON WWTW BEGELLY PEMBROKESHIRE 168 3,053 99.9
Dwr Cymru Welsh Water Radford Pill CAREW/MILTON WWTWS PEMBROKESHIRE 173 2,429 99.9
Dwr Cymru Welsh Water Winterton Mars MARLOES STW 192 2,309 99.5
Dwr Cymru Welsh Water Hazelbeach Stream Waterston WwTW Inlet CSO 314 2,307 99.8
Dwr Cymru Welsh Water Cosheston Pill COSHESTON STW 178 2,245 99.9
Dwr Cymru Welsh Water Western Cleddau Pont-Yr-Hafod Sewage Pumping Station 108 2,067 92.8
Dwr Cymru Welsh Water River Anghof WOLFSCASTLE STW 225 1,986 99.9
Dwr Cymru Welsh Water West Cleddua CSO@WOLFSDALE SPS 113 1,918 98.3
Dwr Cymru Welsh Water Knock Brook Keeston Wastewater Treatment Works 125 1,833 99.8
Dwr Cymru Welsh Water Deepford Brook Clarbeston Road PS 95 1,819 87.2
Dwr Cymru Welsh Water River Ritec STORM TANKS AT TENBY HEADWORKS TE 93 1,774 99.83
Dwr Cymru Welsh Water Tidal Waters Of Western Cleddau Picton PS & Picton Fields CSO 106 1,563 99.9
Dwr Cymru Welsh Water Monk Haven Stream ST. ISHMAELS STW 102 1,561 99.9
Dwr Cymru Welsh Water River Anghof Letterston East STW SPS 94 1,513 99.9
Dwr Cymru Welsh Water Rudbaxton Water SPITTAL WWTW SPITTAL PEMBS 108 1,437 97.4
Dwr Cymru Welsh Water Coastal Waters At Saundersfoot SAUNDERSFOOT STW/PS SAUNDERSFOOT 108 1,392 99.6
Dwr Cymru Welsh Water Estuary East Of Sandy Haven HERBRANDSTON WWTW HERBRANDSTON 75 1,350 99.9
Dwr Cymru Welsh Water Western Cledda LETTERSTON WEST STW 93 1,245 99.8
Dwr Cymru Welsh Water Cartlett Brook Clarbeston Wastewater Treatment Works 132 1,158 99.9
Dwr Cymru Welsh Water Coastal Waters At Porth Clais ST DAVID'S WWTW ST DAVID'S PEMBS 65 1,055 99.8
Dwr Cymru Welsh Water River Marlais CSO at Narberth East SPS 69 913 99.9
Dwr Cymru Welsh Water Milford Haven Waterway DALE WWTW DALE MILFORD HAVEN PEMBS 62 895 100
Dwr Cymru Welsh Water River Anghof WOLFSCASTLE PS 80 883 100
Dwr Cymru Welsh Water Deadman'S Lake Stream STEYNTON SPS 47 882 99.9
Dwr Cymru Welsh Water Tidal River Solva SOLVA P.S. . . 61 835 99.8
Dwr Cymru Welsh Water Pembroke River HUNDLETON WWTW INLET STORM OVERFLOW 153 825 99.9
Dwr Cymru Welsh Water Fords Lake Stream Templeton Waste Water Treatment Works 83 815 99.7
Dwr Cymru Welsh Water Pembroke River / Milford Haven Penanr Fleet Street MH 4101 CSO 60 767 95.5
Dwr Cymru Welsh Water Eastern Cleddau NARBERTH WEST STW 89 747 89.1
Dwr Cymru Welsh Water Nolton Bay CSO SERVING NOLTON HAVEN SPS 48 732 99.9
Dwr Cymru Welsh Water Cartlett Brook Crundale Sewage Pumping Station 63 650 99.9
Dwr Cymru Welsh Water Milford Haven ANGLE VILLAGE PS 68 561 92.9
Dwr Cymru Welsh Water Brandy Brook NEWGALE SEWAGE TREATMENT WORKS 40 550 99.9
Dwr Cymru Welsh Water Bosherton Lake STACKPOLE STW (EMERGENCY) STACKPOLE 60 530 99.6
Dwr Cymru Welsh Water Western Cleddau MERLINS BRIDGE STW 72 511 99.9
Dwr Cymru Welsh Water Pont-Shan Brook LLANDDEWI VELFREY STW 45 490 99.9
Dwr Cymru Welsh Water Milford Haven Waterway BURTON FERRY WWTW NEYLAND PEMBS 57 445 99.9
Dwr Cymru Welsh Water Coastal Waters St Sleekstone WALTON WEST STW 28 425 99.1
Dwr Cymru Welsh Water Llangwm Pill EMERGENCY DISCHARGE FROM LLANG 52 402 99.4
Dwr Cymru Welsh Water U Creswell River Broadmoor Sewage Pumping Station 45 388 88.6
Dwr Cymru Welsh Water Milford Haven Estuary MILFORD HAVEN STW 82 375 99.9
Dwr Cymru Welsh Water Westfield Pill ROSEMARKET STW MILFORD HAVEN 54 361 99.9
Dwr Cymru Welsh Water Fords Lake Stream KILGETTY EAST PS KILGETTY EAST WWTW 44 350 99.9
Dwr Cymru Welsh Water Little Haven Stream LITTLE HAVEN SPS HEAD OF BEACH LIT 26 331 97.6
Dwr Cymru Welsh Water Sandy Haven Pill TIERS CROSS WWTW 66 314 99.8
Dwr Cymru Welsh Water River Alun PIT ST ST. DAVIDS SWO 54 277 83.3
Dwr Cymru Welsh Water Coastal Wtrs Nr Stackpole Quay STACKPOLE STW STACKPOLE 19 273 99.6
Dwr Cymru Welsh Water Castle Pill M.Haven/Castle Pill CSO Pembs 91 263 99.9
Dwr Cymru Welsh Water Sprincle Pill,Daucleddau HOOK WwTW 81 258 99.9
Dwr Cymru Welsh Water Narberth Brook NARBERTH BRIDGE CSO 82 256 99.9
Dwr Cymru Welsh Water Western Cleddau Letterston West WwTW CSO 35 249 99.7
Dwr Cymru Welsh Water New Inn Stream AMROTH AND SUMMERHILL SCHEME PS 2 32 247 99.9
Dwr Cymru Welsh Water Esturial Waters At Rath M'Ford Haven Rath CSO Milford Haven 95 232 99.9
Dwr Cymru Welsh Water River Ritec STORM TANKS AT TENBY HEADWORKS TE 27 224 99.9
Dwr Cymru Welsh Water Westfield Pill Honeyborough SPS CSO 20 201 99.9
Dwr Cymru Welsh Water Angle Bay ANGLE WWTW PEMBROKE PEMBROKESHIRE 17 190 99.9
Dwr Cymru Welsh Water Manorbier Bay MANORBIER TRANSFER PS MANORBIER TE 18 176 99.9
Dwr Cymru Welsh Water Cwm Mawr Strea PENYCWM PS 29 173 99.8
Dwr Cymru Welsh Water Sprinkle Pill Hook STW Inlet PS low level CSO 52 168 99.9
Dwr Cymru Welsh Water Milford Haven NEYLAND P.S. . . 43 156 99.9
Dwr Cymru Welsh Water Merlin'S Brook Johnston Terminal SPS 48 155 99.9
Dwr Cymru Welsh Water Milford Haven (B)MEYRICK ST SWO PEMBROKE DOCK 36 147 98.7
Dwr Cymru Welsh Water Llanion Pill, Milford Haven WATER ST P'BROKE DK SWO 52 143 98.4
Dwr Cymru Welsh Water Western Cleddau NORTHGATE/FRED REES CSO HVRFORDWEST 63 133 99.9
Dwr Cymru Welsh Water Western Cleddau CSO 7 Union Hill, Haverfordwest 84 126 79.2
Dwr Cymru Welsh Water An Unnamed Stream NEW HEDGES PS ROWSTON HOLIDAY PARK 20 118 99.9
Dwr Cymru Welsh Water Est'L Waters Milford Haven DALE WWTW - CSO 20 115 99.7
Dwr Cymru Welsh Water River Alun VIC'GE RD ST.DAVIDS.SWO 34 113 74.5
Dwr Cymru Welsh Water Cresswell River BEGELLY CS0 BEGELLY KILGETTY 24 107 87.6
Dwr Cymru Welsh Water Milford Haven Waterway MILFORD HAVEN STW 18 98 99.9
Dwr Cymru Welsh Water Milford Haven PROMENADE NEYLAND SWO 65 97 98.9
Dwr Cymru Welsh Water Tidal Waters Of Western Cleddau New Quay CSO New Quay Haverfordwest 56 92 99.9
Dwr Cymru Welsh Water Tidal Waters Of Western Cleddau Merlins Bridge STW/Inlet SPS 12 90 99.6
Dwr Cymru Welsh Water Westfield Pill Via Unnamed Watercourse Houghton SPS CSO 17 76 99.9
Dwr Cymru Welsh Water Western Cleddau Combined Sewer Overflow No. 6 66 68 99.4
Dwr Cymru Welsh Water Swanswell Brook BROADHAVEN SOUTH PS BROADHAVEN , 21 64 99
Dwr Cymru Welsh Water Un-Named Stream PENALLY SEWAGE PUMPING STATION 15 63 99.9
Dwr Cymru Welsh Water Castle Pond St Nicholas Crescent CSO, Pembroke 41 59 99.7
Dwr Cymru Welsh Water Milford Haven Waterway Estu'L NEYLAND WWTW NEYLAND PEMBROKESHIRE 36 46 99.9
Dwr Cymru Welsh Water River Hubberston Pill PRIORY PS 17 44 99.8
Dwr Cymru Welsh Water Esturail Waters Milford Haven MILFORD HAVEN STW 22 43 99.8
Dwr Cymru Welsh Water Knightson Brook LAMACK VALE PS LAMACK VALE TENBY , 16 40 99.9
Dwr Cymru Welsh Water Coastal Water Off Trewent Poin TREWENT PARK PS FRESHWATER EAST PE 5 33 99.9
Dwr Cymru Welsh Water Castle Pill A COMBINED SEWER OVERFLOW AT BEACH 52 31 99.9
Dwr Cymru Welsh Water Ford'S Lake TEMPLETON STW STORM 4 29 100
Dwr Cymru Welsh Water Sandy Haven Pill Tiers Cross WWTW Inlet CSO Pembrk 11 24 99.7
Dwr Cymru Welsh Water Castle Pond Mill Bridge CSO 29 21 99.5
Dwr Cymru Welsh Water Colby Stream AMROTH AND SUMMERHILL SCHEME PS 6 20 99.9
Dwr Cymru Welsh Water Pembroke River Pembroke Dock Sycamore Street CSO 25 18 99.3
Dwr Cymru Welsh Water River Alun PEBBLES ST. DAVIDS SWO 16 17 76.5
Dwr Cymru Welsh Water Saundersfoot Stream SAUNDERSFOOT STW/PS SAUNDERSFOOT 9 13 99.8
Dwr Cymru Welsh Water Cocheston Pill - Headwaters To Tidal Limit Fleet St MH2103 CSO, Pennar 22 12 99.5
Dwr Cymru Welsh Water Saundersfoot Stream MILFORD ST P S'S (1 & 1A) SAUNDERSF 7 10 99.8
Dwr Cymru Welsh Water Saundersfoot Stream MILFORD STREET SPS 7 9 99.9
Dwr Cymru Welsh Water Milford Haven Waterway PEMBROKE DOCK WASTEWATER TREATMENT 13 6 99.9
Dwr Cymru Welsh Water Milford Haven Estuary NEYLAND PROMENADE CSO , , 12 5 99.7
Dwr Cymru Welsh Water Swanswell Brook BROADHAVEN NORTH PUMPING STATION 13 4 99.5
Dwr Cymru Welsh Water Pembroke River LAMPHEY WWTW LAMPHEY NEAR PEMBROKE 1 3 99.9
Dwr Cymru Welsh Water Coastal Waters TENBY LIFEBOAT CSO CASTLE SQ TENBY 2 2 99.8
Dwr Cymru Welsh Water Saundersfoot Stream BROOKLANDS PLACE SPS 1 1 99.9
Dwr Cymru Welsh Water St Martins Brook Haverfordwest Hawthorn Rise CSO 4 1 100
Dwr Cymru Welsh Water Lower Mill Pond CSO WOODBINE CLOSE PEMBROKE 3 0 99.8
Dwr Cymru Welsh Water Saundersfoot Stre VALLEY RD P S'S (4 & 4A) SAUNDERSFO 2 0 99.9
Dwr Cymru Welsh Water Esturial Waters Of Pembroke River Pembroke SPS 1 0 99.9
Dwr Cymru Welsh Water Upper Mill Pond CSO at Holyland Rd Pembroke MH 1301 0 0 99.5
Dwr Cymru Welsh Water Westfeild Pill Gaddarn Reach SPS CSO 0 0 99.9
Dwr Cymru Welsh Water Beggars Reach/Daugleddau LLANGWM STW 0 0 99.8
Dwr Cymru Welsh Water Beggars Reach Daugleddau LLANGWM WWTW LLANGWM PEMBROKESHIRE 0 0 100
Dwr Cymru Welsh Water Un-Named Stream LYDSTEP PS 0 0 99.9
Dwr Cymru Welsh Water Esturial Waters At Hakin Point MILFORD HAVEN CSO 0 0 0
Dwr Cymru Welsh Water Unnamed Of Brandy Brook Maes Ffynnon SPS CSO 0 0 99.8
Dwr Cymru Welsh Water Milford Haven Estuary Nelson Quay SPS CSO 0 0 99.9
Dwr Cymru Welsh Water Downstream Barrage / Pembroke River Pembroke Town - Monkton Bridge CSO 0 0 100
Dwr Cymru Welsh Water Stream Above Beach THE GLEN SAUNDERSFOOT PS . . 0 0 99.9

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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