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Area of Outstanding Natural Beauty

Cornwall - 2025 Sewage

Polluted by sewage 30,860 hours in 2025 - That's 3.57 years , monitoring offline 1,130 hours , potential overflows 94 hours

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

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Totals for 2025

Sewage30,860 hours
Monitoring offline1,130 hours
Potential pollution94 hours
Storm overflows181

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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 - 4,721 hours , 0 potential
Feb - 2,839 hours , 58 offline
Mar - 771 hours
Apr - 1,021 hours , 1 potential
May - 74 hours , 1 potential
Jun - 258 hours , 53 offline
Jul - 61 hours , 8 potential
Aug - 197 hours , 116 offline
Sept - 383 hours
Oct - 928 hours
Nov - 6,656 hours , 67 offline
Dec - 12,885 hours , 82 potential

Storm overflows in and around Cornwall

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Offline/Potential Pollution
South West Water ALTARNUN STW_SSO_ALTARNUN Penpont Water 130 2,465h 37m -
South West Water ALTARNUN STW_SSO_ALTARNUN Penpont Water 66 1,568h 32m -
South West Water COT VALLEY_PSCSOEO_ST JUST Atlantic / Porth Nanven Stream 52 1,207h 21m -
South West Water ST NEOT SPS_PSCSOEO_LISKEARD River Loveny 50 1,075h 29m -
South West Water COMMON MOOR STW_SO_COMMON MOOR River Fowey 54 1,067h 23m -
South West Water ST MERRYN_CSO_ST MERRYN Mother Iveys Bay 76 1,053h 59m -
South West Water MYLOR STW_SSO_MYLOR BRIDGE Mylor Creek 50 971h -
South West Water ST NEOT SPS_PSCSOEO_LISKEARD River Loveny 54 948h 5m -
South West Water FOWEY STW_SSO_FOWEY Fowey Estuary 96 941h 14m 28 h
South West Water SHOP STW_SO_SHOP Coombe Valley Stream 44 915h 53m -
South West Water COT VALLEY_PSCSOEO_ST JUST Atlantic / Porth Nanven Stream 51 884h 57m -
South West Water ST MERRYN_CSO_ST MERRYN Mother Iveys Bay 46 875h 25m -
South West Water MYLOR STW_SSO_MYLOR BRIDGE Mylor Creek 33 731h 21m -
South West Water FISHERMANS SQUARE_CSO_MOUSEHOLE Mounts Bay English Channel 39 709h 24m -
South West Water BOJEWYAN SPS_PSCSOEO_ST JUST Stream 26 600h 4m -
South West Water PERRANUTHNOE SPS_PSCSOEO_MARAZION Unknown 34 551h 5m -
South West Water TOWN QUAY SPST_PSCSOEO_FOWEY River Fowey Estuary 153 530h 9m 1 h
South West Water COMMON MOOR STW_SO_COMMON MOOR River Fowey 65 517h 42m -
South West Water MILLBROOK STW_SSO_MILLBROOK Millbrook Lake 30 492h 5m -
South West Water LITTLE PETHERICK STW_SO_WADEBRIDGE Little Petherick Creek 37 485h 48m 82 h
South West Water POLKERRIS SPST_PSCSOEO_POLKERRIS St Austell Bay 29 482h 39m -
South West Water WAR MEMORIAL SPS_PSCSOEO_ALTARNUN Peneont Water 23 432h -
South West Water POLKERRIS SPST_PSCSOEO_POLKERRIS St Austell Bay 28 429h 9m -
South West Water VERYAN STW_SO_VERYAN Carne Stream 18 407h 41m -
South West Water TREVONE SPST_PSCSOEO_PADSTOW Trevone Bay 20 391h 28m -
South West Water MILLBROOK STW_SSO_MILLBROOK Millbrook Lake 36 358h 18m -
South West Water SWANVALE SPS_PSCSOEO_FALMOUTH Falmouth Bay/ Bickland Wat 18 357h 37m -
South West Water CAFFA MILL SPS_PSCSOEO_FOWEY River Fowey Estuary 119 357h 24m -
South West Water SHOP STW_SO_SHOP Coombe Valley Stream 22 356h 18m -
South West Water THE SQUARE CAWSAND_PSCSOEO_CAWSAND Cawsand Bay Estaurine Via Sws 22 344h 12m -
South West Water NEWHAM STW_SSO_TRURO Truro River 23 344h 8m -
South West Water NEWHAM STW_SSO_TRURO Truro River 26 337h 7m -
South West Water SWANVALE SPS_PSCSOEO_FALMOUTH Falmouth Bay/ Bickland Wat 23 332h 59m -
South West Water PORTHCURNO SPS_PSCSOEO_PENZANCE Atlantic Ocean, Off Porthcurno 17 328h 26m -
South West Water NORTH HILL STW_SO_NORTH HILL River Lynher 86 313h 41m -
South West Water LITTLE PETHERICK STW_SO_WADEBRIDGE Little Petherick Creek 66 309h 12m -
South West Water LEMON ARMS SPST_PSCSOEO_MYLOR BRIDGE Mylor Creek 20 286h 6m -
South West Water FOWEY STW_SSO_FOWEY Fowey Estuary 38 282h 26m -
South West Water BOJEWYAN SPS_PSCSOEO_ST JUST Stream 20 272h 16m -
South West Water HELSTON STW_SSO_HELSTON River Cober 19 262h 19m -
South West Water GORRAN HAVEN SPST_PSCSOEO_GORRAN HAVEN Atlantic Ocean 22 243h 49m -
South West Water FISHERMANS SQUARE_CSO_MOUSEHOLE Mounts Bay English Channel 46 232h 1m -
South West Water GOLANT SPST_PSCSOEO_GOLANT River Fowey Estuary 14 226h 22m -
South West Water TREGESEAL STW_SO_ST JUST Tregaseal Stream 14 222h 48m -
South West Water TREKNOW STW_SSO_TREBARWITH Unknown 11 213h 56m -
South West Water TREVILLA SPS_PSCSOEO_FEOCK Pill Creek 16 193h 24m -
South West Water TINTAGEL CASTLE ROAD_PSCSOEO_TINTAGEL Atlantic Ocean 15 167h 3m -
South West Water PORTHTOWAN BEACH No1 SPS_PSCSOEO_PTOWAN River Kenwyn 13 158h 11m -
South West Water BOSSINEY BACK LANE_PSCSOEO_TINTAGEL Atlantic Ocean 10 153h 21m -
South West Water GORRAN HAVEN SPST_PSCSOEO_GORRAN HAVEN Atlantic Ocean 27 146h 13m -
South West Water HELLARCHER SPS_PSCSOEO_THE LIZARD English Channel 24 140h 22m -
South West Water XX NORTH PARADE_CSO_FALMOUTH Penryn River 68 118h 35m -
South West Water SENNEN SPS_PSCSOEO_LANDS END Atlantic Ocean,Off Sennen Cove 9 117h 6m -
South West Water TREHEMBOURNE SPS_PSCSOEO_ST MERRYN Treyarnon Stream 14 109h 29m -
South West Water SENNEN SPS_PSCSOEO_LANDS END Atlantic Ocean,Off Sennen Cove 11 107h 47m -
South West Water HELSTON STW_SSO_HELSTON River Cober 19 107h 42m 56 h
South West Water GORRAN CHURCHTOWN SPST_PSCSOEO_GORRAN Portmellon Stream 11 107h 3m -
South West Water TOWN QUAY SPST_PSCSOEO_FOWEY River Fowey Estuary 29 103h 22m 3 h
South West Water CHURCH COVE RD SPS_PSCSOEO_CHURCH COVE Church Cove 18 102h 30m -
South West Water HELLARCHER SPS_PSCSOEO_THE LIZARD English Channel 44 101h 43m -
South West Water LOWER BOSCASWELL_CSO_ST JUST Atantic Ocean 44 93h 54m -
South West Water XX NORTH PARADE_CSO_FALMOUTH Penryn River 27 89h 34m -
South West Water CAFFA MILL SPS_PSCSOEO_FOWEY River Fowey Estuary 24 89h 4m -
South West Water GEEVOR MINE SPST_PSCSOEO_BOSCASWELL Atlantic Ocean Coastal 14 82h 57m -
South West Water TREKNOW STW_SSO_TREBARWITH Unknown 7 82h 3m -
South West Water MARKET STREET SPS_PSCSOEO_KINGSAND Cawsand Bay 11 75h 54m -
South West Water NORTH HILL STW_SO_NORTH HILL River Lynher 6 70h 47m -
South West Water PORTHCURNO SPS_PSCSOEO_PENZANCE Atlantic Ocean, Off Porthcurno 7 67h 47m -
South West Water ST KEVERNE STW_SSO_ST KEVERNE Unknown 14 64h 3m 59 h
South West Water COVERACK MILL SPST_PSCSOEO_THE LIZARD Coverack Cove 10 63h 29m -
South West Water NORTH PARADE_CSO_FALMOUTH Penryn River 52 57h 41m -
South West Water TREVILLA SPS_PSCSOEO_FEOCK Pill Creek 15 55h 56m -
South West Water BOSSINEY BACK LANE_PSCSOEO_TINTAGEL Atlantic Ocean 10 52h 36m -
South West Water TREGESEAL STW_SO_ST JUST Tregaseal Stream 6 51h 16m -
South West Water TREVONE SPST_PSCSOEO_PADSTOW Trevone Bay 4 50h 45m -
South West Water GEEVOR MINE SPST_PSCSOEO_BOSCASWELL Atlantic Ocean Coastal 17 47h 43m -
South West Water TINTAGEL CASTLE ROAD_PSCSOEO_TINTAGEL Atlantic Ocean 9 47h 16m -
South West Water PERRANUTHNOE SPS_PSCSOEO_MARAZION Unknown 21 43h 45m 0 h
South West Water FLUSHING SPST_PSCSOEO_FALMOUTH Penryn River 35 39h 45m -
South West Water POLPERRO FINESCREEN STW_CSO_POLPERRO English Channel 28 39h 1m -
South West Water CADGWITH SPS_PSCSOEO_CADGWITH English Channel 3 38h 10m -
South West Water BOSORNE RD 1_CSOEO_ST JUST Atlantic / Porth Nanven Stream 22 38h 1m -
South West Water COVERACK MILL SPST_PSCSOEO_THE LIZARD Coverack Cove 16 37h 2m -
South West Water NANCHERROW HILL_CSO_ST JUST Local Stream 22 35h 17m 476 h
South West Water MERES VALLEY SPST_PSCSOEO_MULLION Polurrian Cove 14 34h 57m -
South West Water TREHEMBOURNE SPS_PSCSOEO_ST MERRYN Treyarnon Stream 4 32h 41m -
South West Water HARBOUR SPS_PSCSOEO_PORTHLEVEN Mounts Bay 7 31h 58m 3 h
South West Water MEVAGISSEY SPST_PSCSOEO_MEVAGISSEY Mevagissey Bay 26 30h 33m -
South West Water LOWER BOSCASWELL_CSO_ST JUST Atantic Ocean 20 30h -
South West Water LONDON APPRENTICE SPST_PSCSOEO_ST AUSTEL St Austell River 3 28h 39m -
South West Water CADGWITH SPS_PSCSOEO_CADGWITH English Channel 7 28h 32m -
South West Water MEVAGISSEY SPST_PSCSOEO_MEVAGISSEY Mevagissey Bay 16 28h 2m -
South West Water BOTALLACK_PSCSOEO_TREGESEAL Atlantic Ocean 22 26h 52m -
South West Water BOTALLACK_PSCSOEO_TREGESEAL Atlantic Ocean 14 25h 34m -
South West Water MARKET STREET SPS_PSCSO_KINGSAND Cawsand Bay 17 25h 21m -
South West Water GOLANT SPST_PSCSOEO_GOLANT River Fowey Estuary 28 25h 11m -
South West Water BOSORNE RD 1_CSOEO_ST JUST Atlantic / Porth Nanven Stream 14 23h 45m 337 h
South West Water ST GENNYS STW_SSO_ST GENNYS Unknown 10 20h 12m 13 h
South West Water PORTSCATHO INLET SPS_PSCSOEO_PORTSCATHO Pencabe Drang 13 20h 12m -
South West Water FLUSHING SPST_PSCSOEO_FALMOUTH Penryn River 9 20h 5m -
South West Water BOSWEDDEN SPS_PSCSOEO_CAPE CORNWALL Atlantic Ocean 8 19h 12m -
South West Water HARBOUR SPS_PSCSOEO_PORTHLEVEN Mounts Bay 7 19h 2m -
South West Water NEW POLZEATH SPS_PSCSOEO_POLZEATH Unknown 5 18h 58m -
South West Water NEW POLZEATH SPS_PSCSOEO_POLZEATH Unknown 1 14h 27m -
South West Water MYLOR STW_SO_MYLOR BRIDGE Mylor Creek 4 14h 9m -
South West Water CALENICK SPST_PSCSOEO_TRURO River Tinney 2 13h 33m -
South West Water MOUSEHOLE SPS_PSCSOEO_MOUSEHOLE Mounts Bay 14 13h 33m -
South West Water MARKET STREET SPS_PSCSOEO_KINGSAND Cawsand Bay 11 12h 25m -
South West Water STIBB STW_SO_STIBB Coombe Valley Str 7 11h 29m -
South West Water ST GENNYS STW_SSO_ST GENNYS Unknown 5 11h 28m -
South West Water COVE BOAT POUND SPS_PSCSOEO_ST AGNES Trevaunance Stream 13 11h 17m -
South West Water NANCHERROW HILL_CSO_ST JUST Local Stream 8 10h 39m -
South West Water ST KEVERNE STW_SSO_ST KEVERNE Unknown 3 10h 36m 43 h
South West Water THE SQUARE CAWSAND_PSCSOEO_CAWSAND Cawsand Bay Estaurine Via Sws 10 10h 27m -
South West Water COVE BOAT POUND SPS_PSCSOEO_ST AGNES Trevaunance Stream 9 10h 19m -
South West Water PORT ISAAC SPS_PSCSOEO_PORT ISAAC Haven, Atlantic Ocean 5 9h 58m -
South West Water MERES VALLEY SPST_PSCSOEO_MULLION Polurrian Cove 4 9h 49m -
South West Water STIBB STW_SO_STIBB Coombe Valley Str 4 9h 37m -
South West Water GORRAN CHURCHTOWN SPST_PSCSOEO_GORRAN Portmellon Stream 16 9h 34m -
South West Water LAFLOUDER LANE SPS_PSCSOEO_MULLION English Channel 2 9h 33m -
South West Water PADSTOW HARBOUR SPS_PSCSOEO_PADSTOW River Camel Estuary 3 9h 33m -
South West Water LERRYN SPST_PSCSOEO_LERRYN Tidal River Lerryn 7 9h 28m -
South West Water ST MAWES No1 SPS_PSCSOEO_ST MAWES Carrick Roads 12 8h 33m -
South West Water MARKET STREET SPS_PSCSO_KINGSAND Cawsand Bay 17 8h 21m -
South West Water ST MAWES No1 SPS_PSCSOEO_ST MAWES Carrick Roads 10 8h -
South West Water PORT ISAAC SPS_PSCSOEO_PORT ISAAC Haven, Atlantic Ocean 10 7h 26m -
South West Water POLPERRO FINESCREEN STW_CSO_POLPERRO English Channel 4 6h 49m -
South West Water PORTHILLY COVE SPST_PSCSOEO_PORTHILLY 2 River Camel Estuary Via Sws 4 6h 18m -
South West Water MOUSEHOLE SPS_PSCSOEO_MOUSEHOLE Mounts Bay 9 6h 1m -
South West Water PORT GAVERNE_CSO_PORT GAVERNE Coastal Stream 4 3h 55m -
South West Water SOUTH SLIP_CSO_MOUSEHOLE Mounts Bay English Channel 9 3h 39m -
South West Water BOSWEDDEN SPS_PSCSOEO_CAPE CORNWALL Atlantic Ocean 2 3h 31m -
South West Water SOUTH SLIP_CSO_MOUSEHOLE Mounts Bay English Channel 7 3h 21m -
South West Water BOSCASTLE SPS_PSCSOEO_BOSCASTLE Atlantic Ocean 2 3h 9m -
South West Water READYMONEY ROAD_CSO_FOWEY River Fowey Estuary 7 3h 9m -
South West Water PORT GAVERNE_CSO_PORT GAVERNE Coastal Stream 3 2h 39m -
South West Water READY MONEY COVE SPS_PSCSOEO_FOWEY River Fowey Estuary 2 2h 37m -
South West Water PORTHILLY COVE SPST_PSCSOEO_PORTHILLY 2 River Camel Estuary Via Sws 1 2h 16m -
South West Water CALENICK SPST_PSCSOEO_TRURO River Tinney 2 1h 52m -
South West Water NANSLADRON SPST_PSCSOEO_ST AUSTELL White River 2 1h 30m -
South West Water BOSORNE RD 2_CSOEO_ST JUST Atlantic / Porth Nanven Stream 2 1h 20m -
South West Water PENTEWAN SPS_PSCSOEO_ST AUSTELL St Austell River 1 1h 19m -
South West Water PORTHTOWAN BEACH No1 SPS_PSCSOEO_PTOWAN River Kenwyn 3 1h 5m -
South West Water VERYAN STW_SO_VERYAN Carne Stream 2 1h 5m -
South West Water WHITEHSE SLIP POINT_CSO_FOWEY River Fowey Estuary 3 1h -
South West Water BODINNICK_CSO_FOWEY River Fowey Estuary 1 0h 50m -
South West Water COVERACK HARBOUR SPS_PSCSOEO_THE LIZARD Coverack Cove 4 0h 41m 116 h
South West Water TEHIDY TERRACE_CSO_FALMOUTH Penryn River 1 0h 37m -
South West Water WAR MEMORIAL SPS_PSCSOEO_ALTARNUN Peneont Water 2 0h 29m -
South West Water COVERACK HARBOUR SPS_PSCSOEO_THE LIZARD Coverack Cove 2 0h 25m -
South West Water PORTLOE FINESCN_PSCSOEO_PORTLOE English Channel 1 0h 17m -
South West Water BOSCASTLE SPS_PSCSOEO_BOSCASTLE Atlantic Ocean 1 0h 15m -
South West Water READY MONEY COVE SPS_PSCSOEO_FOWEY River Fowey Estuary 1 0h 14m -
South West Water LERRYN SPST_PSCSOEO_LERRYN Tidal River Lerryn 2 0h 8m -
South West Water PENTEWAN SPS_PSCSOEO_ST AUSTELL St Austell River 1 0h 8m -
South West Water LONDON APPRENTICE SPST_PSCSOEO_ST AUSTEL St Austell River 1 0h 7m -
South West Water NANSLADRON SPST_PSCSOEO_ST AUSTELL White River 1 0h 6m -
South West Water SHIPWRIGHTS SPS_PSCSOEO_HELFORD Helford Creek 1 0h 4m -
South West Water PORT ISAAC STW_SO_PORT ISAAC Port Issac Bay, Atlantic 1 0h 2m -
South West Water BREAGESIDE SPS_PSCSOEO_PORTHLEVEN Mounts Bay, English Channel 0 0h 0 h
South West Water ST AGNES STW_SO_TRURO Atlantic Ocean 0 0h -
South West Water BOSORNE RD 2_CSOEO_ST JUST Atlantic / Porth Nanven Stream 0 0h -
South West Water PENPONT VIEW_CSO_ALTARNUN Mill Leat 0 0h -
South West Water PORTSCATHO INLET SPS_PSCSOEO_PORTSCATHO Pencabe Drang 0 0h -
South West Water THE CLEAVE SPS_PSCSOEO_NORTH ROCK Cawsand Bay 0 0h -
South West Water CHURCH COVE RD SPS_PSCSOEO_CHURCH COVE Church Cove 0 0h -
South West Water NORTH PARADE_CSO_FALMOUTH Penryn River 0 0h -
South West Water READYMONEY ROAD_CSO_FOWEY River Fowey Estuary 0 0h -
South West Water SHIPWRIGHTS SPS_PSCSOEO_HELFORD Helford Creek 0 0h -
South West Water BODINNICK_CSO_FOWEY River Fowey Estuary 0 0h -
South West Water MINIONS_CSO_MINIONS East Looe River 0 0h -
South West Water WHITEHSE SLIP POINT_CSO_FOWEY River Fowey Estuary 0 0h -
South West Water LAFLOUDER LANE SPS_PSCSOEO_MULLION English Channel 0 0h -
South West Water POLRUAN QUAY SPS_PSCSOEO_POLRUAN River Fowey Estuary 0 0h -
South West Water TEHIDY TERRACE_CSO_FALMOUTH Penryn River 0 0h -
South West Water PORTHALLOW SPST_PSCSOEO_HELFORD Porthallow Stream 0 0h 0 h
South West Water PORTLOE FINESCN_PSCSOEO_PORTLOE English Channel 0 0h -
South West Water THE CLEAVE SPS_PSCSOEO_NORTH ROCK Cawsand Bay 0 0h -
South West Water PORT ISAAC STW_SO_PORT ISAAC Port Issac Bay, Atlantic 0 0h -
South West Water MYLOR STW_SO_MYLOR BRIDGE Mylor Creek 0 0h -
South West Water PORTMELLON SPS_PSCSOEO_MEVAGISSEY Stream 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.