Area of Outstanding Natural Beauty

Cornwall - Live Sewage

Polluted by sewage 31,917 hours in 2026 - That's 3.69 years , monitoring offline 2,355 hours , potential overflows 125 hours so far..

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

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Totals for Cornwall in 2026

Sewage31,917 hours
Monitoring offline2,355 hours
Potential pollution125 hours
Storm overflows182

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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 - 11,564 hours , 460 offline
Feb - 13,373 hours , 48 potential
Mar - 3,577 hours , 114 offline
Apr - 108 hours , 1 potential
May - 392 hours , 1,033 offline
Jun - 720 hours , 370 offline
Jul - 480 hours
Aug - 278 hours , 48 potential
Sept - 340 hours , 0 offline
Oct - 879 hours , 5 potential
Nov - 202 hours , 21 potential
Daily data is experimental and data is not guaranteed to be accurate. Please inform us of any issue, we will fix.

Storm overflows in and around Cornwall

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Offline/Potential Pollution
South West Water FOWEY STW_SSO_FOWEY Fowey Estuary 173 2,307h 53m -
South West Water ALTARNUN STW_SSO_ALTARNUN Penpont Water 105 2,128h 30m 19 h
South West Water COT VALLEY_PSCSOEO_ST JUST Atlantic / Porth Nanven Stream 78 1,857h 50m -
South West Water COMMON MOOR STW_SO_COMMON MOOR River Fowey 104 1,814h 32m -
South West Water MYLOR STW_SSO_MYLOR BRIDGE Mylor Creek 69 1,497h 33m -
South West Water FISHERMANS SQUARE_CSO_MOUSEHOLE Mounts Bay English Channel 77 1,353h 17m -
South West Water PERRANUTHNOE SPS_PSCSOEO_MARAZION Unknown 66 1,260h 7m -
South West Water BOJEWYAN SPS_PSCSOEO_ST JUST Stream 54 1,188h 41m -
South West Water MILLBROOK STW_SSO_MILLBROOK Millbrook Lake 59 1,104h 16m -
South West Water ST NEOT SPS_PSCSOEO_LISKEARD River Loveny 58 1,064h 38m -
South West Water ST MERRYN_CSO_ST MERRYN Mother Iveys Bay 60 1,051h 43m -
South West Water SHOP STW_SO_SHOP Coombe Valley Stream 82 1,038h 34m 48 h
South West Water TREGESEAL STW_SO_ST JUST Tregaseal Stream 47 998h 7m -
South West Water VERYAN STW_SO_VERYAN Carne Stream 42 839h 13m -
South West Water THE SQUARE CAWSAND_PSCSOEO_CAWSAND Cawsand Bay Estaurine Via Sws 41 793h 14m -
South West Water POLKERRIS SPST_PSCSOEO_POLKERRIS St Austell Bay 46 743h 18m -
South West Water SWANVALE SPS_PSCSOEO_FALMOUTH Falmouth Bay/ Bickland Wat 39 691h 37m -
South West Water HELSTON STW_SSO_HELSTON River Cober 47 663h 53m -
South West Water PORTHCURNO SPS_PSCSOEO_PENZANCE Atlantic Ocean, Off Porthcurno 37 628h 33m 0 h
South West Water GORRAN CHURCHTOWN SPST_PSCSOEO_GORRAN Portmellon Stream 39 617h 53m -
South West Water NEWHAM STW_SSO_TRURO Truro River 35 583h 57m -
South West Water LEMON ARMS SPST_PSCSOEO_MYLOR BRIDGE Mylor Creek 39 530h 4m 1 h
South West Water LITTLE PETHERICK STW_SO_WADEBRIDGE Little Petherick Creek 52 502h 36m 251 h
South West Water GORRAN HAVEN SPST_PSCSOEO_GORRAN HAVEN Atlantic Ocean 48 473h 14m 0 h
South West Water TOWN QUAY SPST_PSCSOEO_FOWEY River Fowey Estuary 117 466h 22m 1 h
South West Water ST KEVERNE STW_SSO_ST KEVERNE Unknown 39 444h 56m -
South West Water TREVONE SPST_PSCSOEO_PADSTOW Trevone Bay 18 372h 27m -
South West Water PORTHTOWAN BEACH No1 SPS_PSCSOEO_PTOWAN River Kenwyn 24 359h 1m 1 h
South West Water CAFFA MILL SPS_PSCSOEO_FOWEY River Fowey Estuary 98 313h 56m -
South West Water GEEVOR MINE SPST_PSCSOEO_BOSCASWELL Atlantic Ocean Coastal 33 307h 24m -
South West Water TREVILLA SPS_PSCSOEO_FEOCK Pill Creek 25 293h 6m -
South West Water HELLARCHER SPS_PSCSOEO_THE LIZARD English Channel 47 258h 5m -
South West Water BOTALLACK_PSCSOEO_TREGESEAL Atlantic Ocean 29 246h 2m 1,125 h
South West Water TREHEMBOURNE SPS_PSCSOEO_ST MERRYN Treyarnon Stream 15 217h 50m 101 h
South West Water TREKNOW STW_SSO_TREBARWITH Unknown 10 213h 48m -
South West Water NORTH HILL STW_SO_NORTH HILL River Lynher 21 206h 24m 135 h
South West Water BOSSINEY BACK LANE_PSCSOEO_TINTAGEL Atlantic Ocean 19 205h 10m 1 h
South West Water CADGWITH SPS_PSCSOEO_CADGWITH English Channel 17 185h 20m -
South West Water COVERACK MILL SPST_PSCSOEO_THE LIZARD Coverack Cove 24 176h -
South West Water HARBOUR SPS_PSCSOEO_PORTHLEVEN Mounts Bay 22 158h 20m 0 h
South West Water XX NORTH PARADE_CSO_FALMOUTH Penryn River 48 147h 54m 21 h
South West Water COVERACK HARBOUR SPS_PSCSOEO_THE LIZARD Coverack Cove 9 126h 55m 29 h
South West Water SENNEN SPS_PSCSOEO_LANDS END Atlantic Ocean,Off Sennen Cove 16 123h 24m -
South West Water BOSORNE RD 1_CSOEO_ST JUST Atlantic / Porth Nanven Stream 32 117h 44m -
South West Water NANSLADRON SPST_PSCSOEO_ST AUSTELL White River 7 108h 32m -
South West Water TINTAGEL CASTLE ROAD_PSCSOEO_TINTAGEL Atlantic Ocean 9 91h 4m -
South West Water MARKET STREET SPS_PSCSOEO_KINGSAND Cawsand Bay 15 86h 51m -
South West Water FLUSHING SPST_PSCSOEO_FALMOUTH Penryn River 43 79h 22m -
South West Water MERES VALLEY SPST_PSCSOEO_MULLION Polurrian Cove 14 72h 46m -
South West Water GOLANT SPST_PSCSOEO_GOLANT River Fowey Estuary 19 70h 18m -
South West Water LOWER BOSCASWELL_CSO_ST JUST Atantic Ocean 37 68h 8m -
South West Water LONDON APPRENTICE SPST_PSCSOEO_ST AUSTEL St Austell River 6 63h 26m -
South West Water CHURCH COVE RD SPS_PSCSOEO_CHURCH COVE Church Cove 8 61h 18m -
South West Water MARKET STREET SPS_PSCSO_KINGSAND Cawsand Bay 34 45h 45m -
South West Water WAR MEMORIAL SPS_PSCSOEO_ALTARNUN Peneont Water 7 45h 33m -
South West Water BOSWEDDEN SPS_PSCSOEO_CAPE CORNWALL Atlantic Ocean 16 45h 15m -
South West Water PADSTOW HARBOUR SPS_PSCSOEO_PADSTOW River Camel Estuary 3 44h 52m -
South West Water CALENICK SPST_PSCSOEO_TRURO River Tinney 11 42h 21m -
South West Water ST GENNYS STW_SSO_ST GENNYS Unknown 13 36h 14m -
South West Water PORTHILLY COVE SPST_PSCSOEO_PORTHILLY 2 River Camel Estuary Via Sws 7 32h 17m -
South West Water POLPERRO FINESCREEN STW_CSO_POLPERRO English Channel 18 29h 55m 6 h
South West Water COVE BOAT POUND SPS_PSCSOEO_ST AGNES Trevaunance Stream 11 26h 27m 288 h
South West Water MOUSEHOLE SPS_PSCSOEO_MOUSEHOLE Mounts Bay 20 25h 50m -
South West Water ST MAWES No1 SPS_PSCSOEO_ST MAWES Carrick Roads 21 21h 33m -
South West Water NANCHERROW HILL_CSO_ST JUST Local Stream 11 21h -
South West Water NEW POLZEATH SPS_PSCSOEO_POLZEATH Unknown 3 20h 52m 0 h
South West Water BOSORNE RD 2_CSOEO_ST JUST Atlantic / Porth Nanven Stream 16 18h 33m 34 h
South West Water PORTHALLOW SPST_PSCSOEO_HELFORD Porthallow Stream 3 13h 5m 363 h
South West Water NORTH PARADE_CSO_FALMOUTH Penryn River 22 11h 50m -
South West Water BOSCASTLE SPS_PSCSOEO_BOSCASTLE Atlantic Ocean 3 8h 48m -
South West Water SOUTH SLIP_CSO_MOUSEHOLE Mounts Bay English Channel 8 8h 1m -
South West Water LERRYN SPST_PSCSOEO_LERRYN Tidal River Lerryn 13 6h 50m -
South West Water PORT GAVERNE_CSO_PORT GAVERNE Coastal Stream 1 6h 36m -
South West Water BODINNICK_CSO_FOWEY River Fowey Estuary 5 5h 26m -
South West Water PORT ISAAC SPS_PSCSOEO_PORT ISAAC Haven, Atlantic Ocean 6 4h 48m -
South West Water STIBB STW_SO_STIBB Coombe Valley Str 6 3h 45m -
South West Water PENPONT VIEW_CSO_ALTARNUN Mill Leat 2 2h 57m -
South West Water MEVAGISSEY SPST_PSCSOEO_MEVAGISSEY Mevagissey Bay 5 2h 24m -
South West Water PORTSCATHO INLET SPS_PSCSOEO_PORTSCATHO Pencabe Drang 3 2h 5m -
South West Water PORT ISAAC STW_SO_PORT ISAAC Port Issac Bay, Atlantic 3 1h 47m 47 h
South West Water PORTLOE FINESCN_PSCSOEO_PORTLOE English Channel 1 1h 39m -
South West Water READYMONEY ROAD_CSO_FOWEY River Fowey Estuary 3 1h 37m -
South West Water THE CLEAVE SPS_PSCSOEO_NORTH ROCK Cawsand Bay 1 0h 54m -
South West Water POLRUAN QUAY SPS_PSCSOEO_POLRUAN River Fowey Estuary 3 0h 48m -
South West Water READY MONEY COVE SPS_PSCSOEO_FOWEY River Fowey Estuary 1 0h 46m -
South West Water WHITEHSE SLIP POINT_CSO_FOWEY River Fowey Estuary 3 0h 31m -
South West Water VICTORIA QUAY SPST_PSCSOEO_MALPAS Unknown 1 0h 8m -
South West Water FLUSHING SPST_PSCSOEO_FALMOUTH Penryn River 0 0h -
South West Water SHIPWRIGHTS SPS_PSCSOEO_HELFORD Helford Creek 0 0h -
South West Water PENTEWAN SPS_PSCSOEO_ST AUSTELL St Austell River 0 0h -
South West Water BOSORNE RD 1_CSOEO_ST JUST Atlantic / Porth Nanven Stream 0 0h -
South West Water BREAGESIDE SPS_PSCSOEO_PORTHLEVEN Mounts Bay, English Channel 0 0h -
South West Water COMMON MOOR STW_SO_COMMON MOOR River Fowey 0 0h -
South West Water NORTH HILL STW_SO_NORTH HILL River Lynher 0 0h -
South West Water LERRYN SPST_PSCSOEO_LERRYN Tidal River Lerryn 0 0h -
South West Water FOWEY STW_SSO_FOWEY Fowey Estuary 0 0h -
South West Water ST AGNES STW_SO_TRURO Atlantic Ocean 0 0h -
South West Water COVERACK MILL SPST_PSCSOEO_THE LIZARD Coverack Cove 0 0h -
South West Water PORT GAVERNE_CSO_PORT GAVERNE Coastal Stream 0 0h -
South West Water PORT ISAAC SPS_PSCSOEO_PORT ISAAC Haven, Atlantic Ocean 0 0h -
South West Water GORRAN CHURCHTOWN SPST_PSCSOEO_GORRAN Portmellon Stream 0 0h -
South West Water GEEVOR MINE SPST_PSCSOEO_BOSCASWELL Atlantic Ocean Coastal 0 0h -
South West Water BOSORNE RD 2_CSOEO_ST JUST Atlantic / Porth Nanven Stream 0 0h -
South West Water SOUTH SLIP_CSO_MOUSEHOLE Mounts Bay English Channel 0 0h -
South West Water TEHIDY TERRACE_CSO_FALMOUTH Penryn River 0 0h -
South West Water NORTH PARADE_CSO_FALMOUTH Penryn River 0 0h -
South West Water MARKET STREET SPS_PSCSO_KINGSAND Cawsand Bay 0 0h -
South West Water ST MAWES No1 SPS_PSCSOEO_ST MAWES Carrick Roads 0 0h -
South West Water ST GENNYS STW_SSO_ST GENNYS Unknown 0 0h -
South West Water FISHERMANS SQUARE_CSO_MOUSEHOLE Mounts Bay English Channel 0 0h -
South West Water ST MERRYN_CSO_ST MERRYN Mother Iveys Bay 0 0h -
South West Water NANCHERROW HILL_CSO_ST JUST Local Stream 0 0h -
South West Water NEW POLZEATH SPS_PSCSOEO_POLZEATH Unknown 0 0h -
South West Water TREKNOW STW_SSO_TREBARWITH Unknown 0 0h -
South West Water MEVAGISSEY SPST_PSCSOEO_MEVAGISSEY Mevagissey Bay 0 0h -
South West Water MYLOR STW_SO_MYLOR BRIDGE Mylor Creek 0 0h -
South West Water PERRANUTHNOE SPS_PSCSOEO_MARAZION Unknown 0 0h -
South West Water GOLANT SPST_PSCSOEO_GOLANT River Fowey Estuary 0 0h -
South West Water BOSSINEY BACK LANE_PSCSOEO_TINTAGEL Atlantic Ocean 0 0h -
South West Water PORTHILLY COVE SPST_PSCSOEO_PORTHILLY 2 River Camel Estuary Via Sws 0 0h -
South West Water POLPERRO FINESCREEN STW_CSO_POLPERRO English Channel 0 0h -
South West Water MYLOR STW_SSO_MYLOR BRIDGE Mylor Creek 0 0h -
South West Water BOJEWYAN SPS_PSCSOEO_ST JUST Stream 0 0h -
South West Water ST KEVERNE STW_SSO_ST KEVERNE Unknown 0 0h -
South West Water TREGESEAL STW_SO_ST JUST Tregaseal Stream 0 0h -
South West Water PORTSCATHO INLET SPS_PSCSOEO_PORTSCATHO Pencabe Drang 0 0h -
South West Water POLKERRIS SPST_PSCSOEO_POLKERRIS St Austell Bay 0 0h -
South West Water THE SQUARE CAWSAND_PSCSOEO_CAWSAND Cawsand Bay Estaurine Via Sws 0 0h -
South West Water WAR MEMORIAL SPS_PSCSOEO_ALTARNUN Peneont Water 0 0h -
South West Water PORT ISAAC STW_SO_PORT ISAAC Port Issac Bay, Atlantic 0 0h -
South West Water PENTEWAN SPS_PSCSOEO_ST AUSTELL St Austell River 0 0h -
South West Water TREHEMBOURNE SPS_PSCSOEO_ST MERRYN Treyarnon Stream 0 0h -
South West Water TOWN QUAY SPST_PSCSOEO_FOWEY River Fowey Estuary 0 0h -
South West Water MERES VALLEY SPST_PSCSOEO_MULLION Polurrian Cove 0 0h -
South West Water NANSLADRON SPST_PSCSOEO_ST AUSTELL White River 0 0h -
South West Water STIBB STW_SO_STIBB Coombe Valley Str 0 0h -
South West Water COT VALLEY_PSCSOEO_ST JUST Atlantic / Porth Nanven Stream 0 0h -
South West Water LAFLOUDER LANE SPS_PSCSOEO_MULLION English Channel 0 0h -
South West Water CAFFA MILL SPS_PSCSOEO_FOWEY River Fowey Estuary 0 0h -
South West Water SHIPWRIGHTS SPS_PSCSOEO_HELFORD Helford Creek 0 0h -
South West Water MILLBROOK STW_SSO_MILLBROOK Millbrook Lake 0 0h -
South West Water ST NEOT SPS_PSCSOEO_LISKEARD River Loveny 0 0h -
South West Water MOUSEHOLE SPS_PSCSOEO_MOUSEHOLE Mounts Bay 0 0h -
South West Water MINIONS_CSO_MINIONS East Looe River 0 0h -
South West Water SENNEN SPS_PSCSOEO_LANDS END Atlantic Ocean,Off Sennen Cove 0 0h -
South West Water LAFLOUDER LANE SPS_PSCSOEO_MULLION English Channel 0 0h -
South West Water HELLARCHER SPS_PSCSOEO_THE LIZARD English Channel 0 0h -
South West Water TREVONE SPST_PSCSOEO_PADSTOW Trevone Bay 0 0h -
South West Water LITTLE PETHERICK STW_SO_WADEBRIDGE Little Petherick Creek 0 0h -
South West Water COVERACK HARBOUR SPS_PSCSOEO_THE LIZARD Coverack Cove 0 0h -
South West Water WHITEHSE SLIP POINT_CSO_FOWEY River Fowey Estuary 0 0h -
South West Water ALTARNUN STW_SSO_ALTARNUN Penpont Water 0 0h -
South West Water MARKET STREET SPS_PSCSOEO_KINGSAND Cawsand Bay 0 0h -
South West Water BOSCASTLE SPS_PSCSOEO_BOSCASTLE Atlantic Ocean 0 0h -
South West Water TEHIDY TERRACE_CSO_FALMOUTH Penryn River 0 0h -
South West Water BOTALLACK_PSCSOEO_TREGESEAL Atlantic Ocean 0 0h -
South West Water BODINNICK_CSO_FOWEY River Fowey Estuary 0 0h -
South West Water SHOP STW_SO_SHOP Coombe Valley Stream 0 0h -
South West Water VERYAN STW_SO_VERYAN Carne Stream 0 0h -
South West Water XX NORTH PARADE_CSO_FALMOUTH Penryn River 0 0h -
South West Water HELSTON STW_SSO_HELSTON River Cober 0 0h -
South West Water LONDON APPRENTICE SPST_PSCSOEO_ST AUSTEL St Austell River 0 0h -
South West Water CHURCH COVE RD SPS_PSCSOEO_CHURCH COVE Church Cove 0 0h -
South West Water BOSWEDDEN SPS_PSCSOEO_CAPE CORNWALL Atlantic Ocean 0 0h -
South West Water READY MONEY COVE SPS_PSCSOEO_FOWEY River Fowey Estuary 0 0h -
South West Water GORRAN HAVEN SPST_PSCSOEO_GORRAN HAVEN Atlantic Ocean 0 0h -
South West Water LOWER BOSCASWELL_CSO_ST JUST Atantic Ocean 0 0h -
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 READYMONEY ROAD_CSO_FOWEY River Fowey Estuary 0 0h -
South West Water MYLOR STW_SO_MYLOR BRIDGE Mylor Creek 0 0h -
South West Water CALENICK SPST_PSCSOEO_TRURO River Tinney 0 0h -
South West Water PORTMELLON SPS_PSCSOEO_MEVAGISSEY Stream 0 0h -
South West Water TREVILLA SPS_PSCSOEO_FEOCK Pill Creek 0 0h -
South West Water COVE BOAT POUND SPS_PSCSOEO_ST AGNES Trevaunance Stream 0 0h -
South West Water CADGWITH SPS_PSCSOEO_CADGWITH English Channel 0 0h -
South West Water PORTHCURNO SPS_PSCSOEO_PENZANCE Atlantic Ocean, Off Porthcurno 0 0h -
South West Water PORTHTOWAN BEACH No1 SPS_PSCSOEO_PTOWAN River Kenwyn 0 0h -
South West Water NEWHAM STW_SSO_TRURO Truro River 0 0h -
South West Water SWANVALE SPS_PSCSOEO_FALMOUTH Falmouth Bay/ Bickland Wat 0 0h -
South West Water TINTAGEL CASTLE ROAD_PSCSOEO_TINTAGEL Atlantic Ocean 0 0h -
South West Water HARBOUR SPS_PSCSOEO_PORTHLEVEN Mounts Bay 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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