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South Dorset

Polluted by sewage 630 times in 2025 lasting 1,535 hours

Monitoring fell below 50% 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 South Dorset in 2026

So far this year (as of 18 May 2026, 12:00) there has been 5,568 hours of sewage overflows, from 136 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s

Totals for South Dorset in 2025

53 Sites polluted by Wessex Water
630 sewage dumps
1,535 hours duration
That's 2.13 months. On average 1.7 times a day

Change Over Time

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Waterways in South Dorset

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Pollution Summary 2025

Here are all the reported sewage overflow totals for South Dorset 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 65 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.

Company Waterway Site Sewage Dumps Duration (Hours) Reporting %
Wessex Water Unknown WEYMOUTH SEWAGE TREATMENT WORKS 65 302 100
Wessex Water Corfe River CORFE CASTLE STW 27 192 100
Wessex Water River Frome MORRIS ROAD PUMPING STATION 36 187 100
Wessex Water River Frome STATION ROAD CSO 23 110 100
Wessex Water Swanage Bay SWANAGE TUNNEL 22 76 100
Wessex Water Corfe River GLEBE FARM PUMPING STATION 15 75 100
Wessex Water River Win EAST CHALDON PUMPING STATION 10 50 99.9
Wessex Water Unnamed Stream HARMAN'S CROSS PUMPING STATION 10 45 99.5
Wessex Water Corfe River CHURCH KNOWLE ANIMAL SANCTUARY PS 9 36 100
Wessex Water Weymouth Harbour Via Sws RODWELL AVENUE CSO 44 33 98.3
Wessex Water River Wey CHAFEY'S LAKE CSO 14 32 96.1
Wessex Water River Frome LYTCHETT LANE PUMPING STATION 11 30 100
Wessex Water River Win EAST BURTON CROSS ROAD PS 6 29 100
Wessex Water English Channel OSMINGTON BAY HOLIDAY CENTRE PS 15 27 100
Wessex Water Radipole Lake ROMAN ROAD COMBINED SEWER OVERFLOW 38 26 100
Wessex Water River Win BLACKNOLL 12 23 100
Wessex Water Stream At Winspit Botttom WORTH MATRAVERS WWTW 19 22 100
Wessex Water River Frome RAILWAY COTTAGES PUMPING STATION 20 22 100
Wessex Water Unnamed Stream To Durlston Bay DURLSTON ROAD PS 20 19 100
Wessex Water English Channel WEST LULWORTH PUMPING STATION 8 17 100
Wessex Water Corfe River RED LANE PUMPING STATION 6 16 100
Wessex Water Weymouth Harbour THE MARSH COMBINED SEWER OVERFLOW 10 15 100
Wessex Water River Frome BOVINGTON TERMINAL PUMPING STATION 3 14 100
Wessex Water Freshwater Bay SOUTHWELL PS 12 14 100
Wessex Water Corfe River STUDLAND ROAD PUMPING STATION 10 11 99.9
Wessex Water River Swan HERSTON CROSS ATTENUATION TANK CSO 6 10 100
Wessex Water Weymouth Harbour ADMIRAL HARDY CSO 6 9 88.1
Wessex Water Little Sea WADMORE LANE PUMPING STATION 4 9 99.8
Wessex Water Ulwell Stream NEW SWANAGE ATTENUATION TANK 4 7 100
Wessex Water River Piddle BRIANTSPUDDLE SEWAGE 1 6 100
Wessex Water Groundwater Via Infilt System WESTON STREET COMBINED SEWER OF 8 6 99.9
Wessex Water Unnamed Stream RINGSTEAD STW 1 5 99.9
Wessex Water Weymouth Bay CRANFORD AVENUE CSO 17 4 95.9
Wessex Water Weymouth Harbour CHICKERELL BOYS CLUB CSO 20 4 95.3
Wessex Water River Frome EAST KNIGHTON PUMPING STATION 1 4 100
Wessex Water River Wey FAIRFIELD SEWAGE PUMPING STATION 4 4 100
Wessex Water Studland Bay COOMBE PUMPING STATION 5 4 100
Wessex Water Weymouth Bay MELCOMBE AVENUE CSO 13 4 99.8
Wessex Water Portland Harbour REAR DONCASTER ROAD 11 3 99.9
Wessex Water Radipole Lake Via Sws CORONATION CRESCENT CSO 14 3 100
Wessex Water Radipole Lake Via Sws ULLSWATER CRESCENT CSO 8 1 100
Wessex Water English Channel LULWORTH BEACH PUMPING STATION 7 1 100
Wessex Water Weymouth Harbour CHICKERELL ROAD CSO 6 1 34
Wessex Water Portland Harbour VICTORIA SQUARE PORTLAND 5 1 100
Wessex Water Weymouth Harbour WESTON ROAD CSO 3 0 100
Wessex Water Lyme Bay PORTLAND RAILWAY GRAVITY SEWER 7 0 90
Wessex Water Portland Harbour CASTLE COVE PUMPING STATION 2 0 100
Wessex Water Portland Harbour HILLCREST ROAD PUMPIMG STATION 1 0 100
Wessex Water Weymouth Harbour NEWSTEAD ROAD PUMPING STATION 1 0 100
Wessex Water West Bay HIGH STREET CSO 5 0 100
Wessex Water Weymouth Harbour LONGCROFT ROAD CSO 1 0 61.6
Wessex Water English Channel PORTLAND BILL STORM OVERFLOW 3 0 100
Wessex Water Weymouth Harbour WARDCLIFFE ROAD CSO 1 0 100
Wessex Water River Piddle AFFPUDDLE PUMPING STATION 0 0 100
Wessex Water River Frome DUNCAN CRESCENT PUMPING STATION 0 0 100
Wessex Water Fleet FERRYBRIDGE PS 0 0 100
Wessex Water Radipole Lake GRASMERE ROAD CSO 0 0 100
Wessex Water Corfe River HALVES COTTAGE PUMPING STATION 0 0 100
Wessex Water Weymouth Harbour Via Sws MARLOW ROAD COMBINED SEWER OVERFLOW 0 0 100
Wessex Water Ground PENNSYLVANIA ROAD PS 0 0 100
Wessex Water Weymouth Harbour RADIPOLE LAKE PUMPING STATION 0 0 100
Wessex Water Radipole Lake Via Sws SPA ROAD COMBINED SEWER OVERFLOW 0 0 100
Wessex Water Weymouth Harbour Via Sws SPRING LANE CSO 0 0 99.5
Wessex Water Weymouth Harbour SPRING ROAD COMBINED SEWER OVERFLOW 0 0 100
Wessex Water To Studland Bay WATERY LANE PUMPING STATION 0 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

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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