Plymouth

Polluted by sewage 3,412 times in 2025 lasting 15,579 hours - That's 1.8 years!

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Totals for Plymouth in 2025

110 Sites polluted by South West Water

3,412 sewage dumps

15,579 hours duration

Sewage pollution map of Plymouth: 15,579 hours in 2025

That's 1.8 years. On average 9.3 times a day

Change Over Time

Constituency for Plymouth

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Waterways in Plymouth

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Plymouth 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 place all the declared CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s appeared to have monitoring enabled for more than 50% of the year

Company	Waterway	Site	Sewage Dumps	Duration (Hours)	Reporting %
South West Water	Weston Mill Lake	CAMELS HEAD WWTW	126	2,188	99.85
South West Water	River Tamar	ERNESETTLE SEWAGE TREATMENT WORKS	161	1,975	91.8
South West Water	Leigham Mill Stream	FORDER VALLEY ROAD CSO	94	1,134	100
South West Water	Plymouth Sound/Plym Estuary	PLYMOUTH CENTRAL STW	119	925	100
South West Water	River Plym	MARSH MILLS WWTW	84	871	98.8
South West Water	Long Brook Via Sws	3 ST PETERS CLOSE CSO	107	841	99.9
South West Water	Leigham Mill Stream	EFFORD MARSH CSO	61	718	100
South West Water	River Plym	GLENHOLT PUMPING STATION	67	592	99.7
South West Water	Weston Mill Stream	HONDA GARAGE CSO	43	533	100
South West Water	River Tamar	DOCKYARD NO.3 PUMPING STATION	43	337	100
South West Water	Plymouth Sound	EASTERN KINGS PUMPING STATION	47	283	99.6
South West Water	Tory Brook	PLYMOUTH ROAD CSO	88	271	100
South West Water	River Plym Via Sws	LAIRA PARK CSO	87	267	100
South West Water	Hooe Lake	RADFORD STW	54	267	99.8
South West Water	Plymouth Sound Via Sws	CAMBRIDGE LANE COMBINED SEWER OF	76	252	99.5
South West Water	River Tamar Viasws	KINTERBURY CREEK PUMPING STATION	20	246	100
South West Water	Tamerton Lake	WHITLEIGH WOOD CSO	44	220	100
South West Water	Sutton Harbour Via Sws	59 BRETONSIDE CSO	51	217	89.8
South West Water	Longbrook	MARKET ROAD CSO	46	203	100
South West Water	River Tamar	PS-DY2, NORTH YARD, DEVONPORT	28	201	100
South West Water	Plymouth Sound	POTTERY QUAY PUMPING STATION	40	189	100
South West Water	Southway Stream	SOUTHWAY DRIVE CSO	54	188	100
South West Water	River Plym Via Sws	ARNOLDS POINT PUMPING STATION	17	171	100
South West Water	River Plym Via Sws	LIPSON VALE 1 CSO	95	158	100
South West Water	Weston Mill Stream	WESTON MILL CEMETERY TANK CSO	21	157	100
South West Water	Tamerton Stream	HAYESEND FARM CSO	12	155	93.3
South West Water	River Plym Via Sws	PIKE ROAD COMBINED SEWER OVERFLOW	87	153	99.4
South West Water	Hamoaze	MACEY STEPS CSO	56	127	96.4
South West Water	River Yealm Est	ELBURTON SOUTH PS	46	118	99.8
South West Water	Tamerton Lake	TAMERTON FOLIOT PUMPING STATION	25	98	94.5
South West Water	Honicknowle Stream	HONICKNOWLE CSO	32	87	98.6
South West Water	River Tamar	MUTTON COVE PUMPING STATION	41	84	100
South West Water	Plymouth Sound	OCEAN COURT PUMPING STATION	35	79	100
South West Water	Pennycomequick Stream Via Sws	BARN PARK ROAD CSO	69	75	100
South West Water	River Plym Via Sws	LIPSON VALE 2 CSO	52	74	100
South West Water	Stonehouse Creek Via Sws	CENTRAL PARK CSO	28	71	98.8
South West Water	Plymouth Sound	MILLBAY TANKS	12	65	100
South West Water	Plymouth Sound	20 COMMERCIAL ROAD	24	57	100
South West Water	Stonehouse Creek Via Sws	PARADISE ROAD (GRAVEYARD) CSO	39	56	98.9
South West Water	Honicknowle Stream	GARRICK CLOSE CSO	39	49	97
South West Water	Stonehouse Creek	SEYMOUR PLACE CSO	32	45	100
South West Water	Longbrook Stream	DARK STREET LANE CSO	29	41	100
South West Water	Cattewater	TURNCHAPEL BARRACKS PUMPING STATION	25	39	100
South West Water	Stonehouse Creek Via Sws	WILTON ROAD CSO	39	34	100
South West Water	Cattewater	TURNCHAPEL SLIPWAY PUMPING STATION	30	34	100
South West Water	River Tamar	ROWING CLUB NO2 CSO	30	32	100
South West Water	River Plym Via Sws	178 BEAUMONT ROAD CSO	51	31	99.3
South West Water	River Plym	TREFIUS PARK COMBINED SEWER OVERFLO	42	31	86.6
South West Water	River Plym Estuary	ORESTON QUAY (NO 2) PUMPING STATION	15	31	100
South West Water	Weston Mill Lake	FLORENCE STREET CSO	59	28	99.9
South West Water	River Tamar Estuary	COOMBE ROAD CSO	10	25	100
South West Water	Ham Brook	HONICKNOWLE LANE CSO	31	24	93.3
South West Water	Stonehouse Creek	139 OUTLAND ROAD CSO	28	24	94.3
South West Water	River Tamar	EDINBURGH STREET (PS5) PS	18	23	100
South West Water	River Plym Via Sws	JEPHSON ROAD CSO	24	23	99.4
South West Water	Plymouth Sound	BARBICAN (SUTTON HARBOUR) TANKS	168	22	100
South West Water	River Plym Via Sws	FARRINGDON ROAD CSO	19	22	100
South West Water	River Tamar	SALTASH ROAD SPS PLYMOUTH	23	21	100
South West Water	Hooe Lake, Plym Estuary	HOOE LAKE PUMPING STATION	6	19	100
South West Water	River Plym Via Sws	1 EDNA TERRACE CSO	14	17	100
South West Water	Weston Mill Lake	CAMELS HEAD WWTW	8	17	95.6
South West Water	Stonehouse Creek Via Sws	PEVERELL PARK ROAD CSO	31	15	96.2
South West Water	Pomphlett Creek	BILLACOMBE PUMPING STATION	19	15	100
South West Water	Leigham Mill Stream	HARLECH CLOSE CSO	19	14	100
South West Water	Cattewater Plym Estuary	MARINE ROAD NO 1 PUMPING STATION	8	13	100
South West Water	Stonehouse Creek Via Sws	MILL BRIDGE CSO	12	11	100
South West Water	River Tamar Estuary	WATERSIDE PUMPING STATION	8	10	99.7
South West Water	Tory Brook Via Sws	NEWNHAM ROAD CSO	22	10	100
South West Water	River Plym Via Sws	78 BEAUMONT ROAD CSO	30	9	99.1
South West Water	River Plym Via Sws	SEYMOUR AVENUE/BEAUMONT RD CSO	28	9	99.1
South West Water	Tamar Estuary	OLD FERRY ROAD CSO	11	7	100
South West Water	River Tamar	CORNWALL BEACH (PS3)	2	7	100
South West Water	River Tamar Via Sws	ERNESETTLE LANE SPORTSGROUND CSO	35	7	88.7
South West Water	River Tamar	BRUNEL BRIDGE CSO	29	6	94.8
South West Water	River Plym Via Sws	SEYMOUR AVENUE/SALISBURY RD CSO	24	5	100
South West Water	Plymouth Sound	WEST HOE TUNNEL SHAFT 5B.2	4	4	100
South West Water	Ham Brook	HAM LANE STORM TANK CSO	7	4	92.4
South West Water	Hooe Lake Via Sws	HOOE ROAD CSO	18	4	100
South West Water	River Plym Via Sws	CAVENDISH ROAD CSO	13	4	100
South West Water	Honicknowle Stream	MOWHAY ROAD NO.2 CSO	4	4	100
South West Water	River Plym	R/O GARAGES LANHYDROCK ROAD CSO	12	4	96.6
South West Water	River Plym	OPP 44 CARMARTHEN ROAD CSO	24	4	96.7
South West Water	River Plym Estuary	JETTY PUMPING STATION	2	3	99.7
South West Water	Stonehouse Creek Via Sws	VICTORIA PARK CSO	3	3	100
South West Water	Plymouth Sound Via Sws	PENNYCOMEQUICK ROUNDABOUT CSO	6	3	100
South West Water	Stonehouse Creek Via Sws	DALE ROAD CSO	6	3	93.4
South West Water	River Tamar	KINTERBURY CREEK RIVERSIDE PS	6	2	100
South West Water	Honicknowle Stream	DENHAM CLOSE CSO	2	2	99.6
South West Water	River Plym Via Sws	45 CRAVEN AVENUE CSO	4	1	100
South West Water	Ham Brook	146 ST. PANCRAS AVENUE CSO	3	1	100
South West Water	River Plym Via Sws	28 FINCH CLOSE CSO	2	1	96.5
South West Water	Weston Mill Creek Via Wtr Crse	WOLSELEY ROAD TANK CSO	1	1	100
South West Water	Ham Brook	SHIRLEY GARDENS CSO	4	1	100
South West Water	River Plym Via Sws	LAIRA AVENUE CSO	1	1	86.4
South West Water	River Tamar	ROWING CLUB NO1 CSO	8	1	100
South West Water	Cattewater	20 COMMERCIAL ROAD	4	1	100
South West Water	Honicknowle Stream	CROWNHILL ROAD CSO	3	0	97.8
South West Water	Weston Mill Lake Via W'Course	MAUNSELL CLOSE CSO	4	0	100
South West Water	River Plym	HEATHFIELD ROAD CSO	3	0	100
South West Water	Millbay Dock Via Sws-Estuarine	ETON PLACE CSO	3	0	94.8
South West Water	River Plym	OLD LAIRA ROAD JUNCTION CSO	3	0	100
South West Water	Honicknowle Stream Via Sws	CROWNHILL ROAD CSO	1	0	97.8
South West Water	Honicknowle Stream	TAMAR WAY CSO	2	0	100
South West Water	Kinterbury Creek Via W/Crse	R/O 615 WOLSELEY ROAD	3	0	89
South West Water	Hamoaze	MORICE YARD CSO	1	0	100
South West Water	Tory Brook	MOORLAND ROAD CSO	1	0	100
South West Water	Hamoaze	MOON COVE CSO	1	0	100
South West Water	Ham Brook	HAM WOODS HAM LANE CSO	1	0	96.1
South West Water	Stone House Creek Via Sws	PENNYCOMEQUICK HILL CSO	2	0	95.2
South West Water	Saltmill Creek	RIVERVIEW CSO	1	0	100
South West Water	Tamerton Lake	TAMERTON CLOSE PSEO	0	0	99.6
South West Water	Ham Brook	TREVENEAGUE GRDNS PLAYING FIELD CSO	0	0	100
South West Water	Pennycomequick Stream Via Sws	2 BICKHAM PARK ROAD CSO	0	0	100
South West Water	Stonehouse Creek	ALLOTMENT CSO	0	0	100
South West Water	River Tamar	DOCKYARD NO.1	0	0	87.1
South West Water	River Plym	EMBANKMENT ROAD PUMPING STATION	0	0	99.9
South West Water	River Plym	GWYN ROAD COMBINED SEWER OVERFLOW	0	0	98.7
South West Water	River Plym	MARSH MILLS PUMPING STATION	0	0	99.1
South West Water	Millbay Docks Via Sws	TRACEY COURT CSO	0	0	93.9
South West Water	Plymouth Sound	WEST HOE PUMPING STATION	0	0	100
South West Water	River Tamar Estuary	CULVER ROAD CSO	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

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.

Analysing sewage pollution by the Water Industry

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