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Truro and Falmouth - 2025 Sewage

Polluted by sewage 26,597 hours in 2025 - That's 3.08 years , monitoring offline 646 hours , potential overflows 1,358 hours

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

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View Annual Sewage Data

You're looking at the totals that we have calculated for sewage in Truro and Falmouth for 2025. It is an estimate, based on very poor quality live data from the Water Companies. This may not align with the 'official' reported sewage values from the water companies, which is reported in April following then end of the year - so 2025 numbers are reported in April 2026.

What's a potential overflow? If the CSO goes 'Offline' while its Overflowing, we don't know if it stopped overflowing until we get a 'Stop' event.

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Constituencies near Truro and Falmouth

Daily Data

Jan - 4,454 hours , 36 potential
Feb - 2,880 hours , 206 potential
Mar - 968 hours , 371 potential
Apr - 1,699 hours , 720 potential
May - 82 hours , 24 potential
Jun - 244 hours
Jul - 40 hours , 128 offline
Aug - 113 hours
Sept - 331 hours , 352 offline
Oct - 257 hours , 20 offline
Nov - 5,954 hours , 0 offline
Dec - 9,497 hours , 144 offline
Daily data is experimental and data is not guaranteed to be accurate. Please inform us of any issue, we will fix.
Please note: We don't have rainfall data for Wales. If you know where to source it please let us know!
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Totals so far

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Offline/Potential Pollution
South West Water CHACEWATER STW_SSO_CHACEWATER Unknown 124 2,680h 19m 51 h
South West Water PONSANOOTH STW_SSO_PONSANOOTH River Kennal 90 1,827h 40m -
South West Water 39 ST MICHAELS ROAD_CSO_PONSONOOTH River Kennall 117 1,649h 39m -
South West Water GOONHAVERN STW_SSO_GOONHAVERN Bolingey Stream 95 1,513h 58m 190 h
South West Water PONSANOOTH STW_SSO_PONSANOOTH River Kennal 59 1,392h 59m -
South West Water CHACEWATER STW_SSO_CHACEWATER Unknown 57 1,363h 31m -
South West Water GRAMPOUND ROAD SPST_PSCSOEO_GRAMPOUND River Fal 96 1,356h 26m -
South West Water 39 ST MICHAELS ROAD_CSO_PONSONOOTH River Kennall 57 1,318h 40m -
South West Water GRAMPOUND ROAD SPST_PSCSOEO_GRAMPOUND River Fal 54 1,118h 38m -
South West Water GOONHAVERN STW_SSO_GOONHAVERN Bolingey Stream 53 1,058h 36m -
South West Water MYLOR STW_SSO_MYLOR BRIDGE Mylor Creek 50 971h -
South West Water MYLOR STW_SSO_MYLOR BRIDGE Mylor Creek 33 731h 21m -
South West Water COMMERCIAL ROAD SPS_PSCSOEO_PENRYN Penryn River 52 596h 25m -
South West Water MITCHELL SPST_PSCSOEO_TRURO Benny Stream 32 565h 5m -
South West Water PRAZE TANK_CSO_PENRYN Praze Stream 30 557h 10m -
South West Water GOONHAVERN STW_SO_GOONHAVERN Bolingey Stream 53 449h 13m -
South West Water GOONHAVERN STW_SO_GOONHAVERN Bolingey Stream 31 437h 30m -
South West Water FALMOUTH STW_SSO_FALMOUTH Penryn River 23 410h 45m -
South West Water VERYAN STW_SO_VERYAN Carne Stream 18 407h 41m -
South West Water LADOCK VALLEY STW_SSO_TRESILLIAN Tresillian River Estuary 27 394h 17m -
South West Water SWANVALE SPS_PSCSOEO_FALMOUTH Falmouth Bay/ Bickland Wat 18 357h 37m -
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 LADOCK VALLEY STW_SSO_TRESILLIAN Tresillian River Estuary 29 334h 20m -
South West Water SWANVALE SPS_PSCSOEO_FALMOUTH Falmouth Bay/ Bickland Wat 23 332h 59m -
South West Water CHACEWATER BROOK_CSO_TRURO Carnon River 20 322h 12m -
South West Water COMMERCIAL ROAD SPS_PSCSOEO_PENRYN Penryn River 25 295h -
South West Water LEMON ARMS SPST_PSCSOEO_MYLOR BRIDGE Mylor Creek 20 286h 6m -
South West Water GORRAN HAVEN SPST_PSCSOEO_GORRAN HAVEN Atlantic Ocean 22 243h 49m -
South West Water HIGH ST_CSO_FALMOUTH Penryn River 71 222h 57m -
South West Water TREVILLA SPS_PSCSOEO_FEOCK Pill Creek 16 193h 24m -
South West Water FALMOUTH STW_SSO_FALMOUTH Penryn River 16 171h 57m -
South West Water GORRAN HAVEN SPST_PSCSOEO_GORRAN HAVEN Atlantic Ocean 27 146h 13m -
South West Water EDWARD ST_CSO_TRURO River Kenwyn 48 143h 52m 211 h
South West Water CHACEWATER BROOK_CSO_TRURO Carnon River 31 134h 28m 37 h
South West Water PRAZE TANK_CSO_PENRYN Praze Stream 29 127h 17m 27 h
South West Water HIGH ST_CSO_FALMOUTH Penryn River 28 123h 56m -
South West Water XX NORTH PARADE_CSO_FALMOUTH Penryn River 68 118h 35m -
South West Water GORRAN CHURCHTOWN SPST_PSCSOEO_GORRAN Portmellon Stream 11 107h 3m -
South West Water QUENCHWELL SPS_PSCSOEO_CARNON DOWNS Carnon River 12 103h 10m -
South West Water BOSVIGO LN_CSO_TRURO Freshwater 15 98h 31m -
South West Water XX NORTH PARADE_CSO_FALMOUTH Penryn River 27 89h 34m -
South West Water QUENCHWELL SPS_PSCSOEO_CARNON DOWNS Carnon River 16 78h 57m -
South West Water CARNON DOWNS STW_SO_CARNON DOWNS Carnon River 13 69h 55m -
South West Water TREGONY SPST_PSCSOEO_TREGONY River Fal 8 61h 49m -
South West Water NEWLYN EAST STW_SO_NEWLYN EAST River Gannel 43 59h 24m -
South West Water NORTH PARADE_CSO_FALMOUTH Penryn River 52 57h 41m -
South West Water ROBERTS OPE_CSO_TRURO River Kenwyn[S] 35 56h 4m -
South West Water TREVILLA SPS_PSCSOEO_FEOCK Pill Creek 15 55h 56m -
South West Water DEVORAN SPS_PSCSOEO_DEVORAN River Carnon Estuary 7 54h 29m -
South West Water BOSVIGO LN_CSO_TRURO Freshwater 4 47h 2m -
South West Water GREENBANK GARDENS_CSO_FALMOUTH Penryn River 29 46h 29m -
South West Water FLUSHING SPST_PSCSOEO_FALMOUTH Penryn River 35 39h 45m -
South West Water MORLAIX AV_CSO_FYFFES SLIPWAY Truro River 11 39h 33m 904 h
South West Water O/S XX THOMAS ST_CSO_PENRYN Penryn River 29 38h 11m -
South West Water GREENBANK GARDENS_CSO_FALMOUTH Penryn River 16 36h 38m -
South West Water NEWLYN EAST STW_SO_NEWLYN EAST River Gannel 23 28h 19m -
South West Water KILLIGREW ST_CSO_FALMOUTH Penryn River 23 24h 17m -
South West Water BLACKWATER STW_SO_BLACKWATER Unknown 27 20h 37m -
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 TRELANDER HIGHWAY_CSO_TRURO River Allen 23 17h 23m -
South West Water VICTORIA SQUARE_CSO_TRURO River Kenwyn 18 17h 3m -
South West Water O/S XX THOMAS ST_CSO_PENRYN Penryn River 12 16h 45m -
South West Water VICTORIA SQUARE_CSO_TRURO River Kenwyn 12 14h 59m -
South West Water MYLOR STW_SO_MYLOR BRIDGE Mylor Creek 4 14h 9m -
South West Water BLACKWATER STW_SO_BLACKWATER Unknown 13 14h 1m -
South West Water KILLIGREW ST_CSO_FALMOUTH Penryn River 9 13h 52m -
South West Water CALENICK SPST_PSCSOEO_TRURO River Tinney 2 13h 33m -
South West Water TRELANDER HIGHWAY_CSO_TRURO River Allen 13 12h 56m -
South West Water OLD BRIDGE ST CAR PARK_CSO_TRURO River Allen 16 12h 31m -
South West Water MITCHELL SPST_PSCSOEO_TRURO Benny Stream 11 11h 2m -
South West Water QUEEN MARY GARDENS SPS_PSCSOEO_FALMOUTH Falmouth Bay 13 9h 45m -
South West Water GORRAN CHURCHTOWN SPST_PSCSOEO_GORRAN Portmellon Stream 16 9h 34m -
South West Water CHACEWATER STW_SO_CHACEWATER Unknown 11 9h 9m -
South West Water ST MAWES No1 SPS_PSCSOEO_ST MAWES Carrick Roads 12 8h 33m -
South West Water LEMON MEWS_CSO_TRURO River Kenwyn 4 8h 21m -
South West Water ST MAWES No1 SPS_PSCSOEO_ST MAWES Carrick Roads 10 8h -
South West Water QUEEN MARY GARDENS SPS_PSCSOEO_FALMOUTH Falmouth Bay 9 7h 29m -
South West Water OLD HILL SPS_PSCSOEO_FALMOUTH Penryn River 7 7h 10m -
South West Water PAULS TERRACE_CSO_TRURO River Allen 5 6h 21m 435 h
South West Water GROVE PLACE NO. 1_CSO_FALMOUTH Penryn River 5 6h 15m -
South West Water EDWARD ST_CSO_TRURO River Kenwyn 9 6h 4m -
South West Water GROVE PLACE NO. 1_CSO_FALMOUTH Penryn River 4 5h 41m -
South West Water ELLENGLAZE SPS_PSCSOEO_CUBERT Stream 4 5h 33m -
South West Water RUZZA SPS_PSCSOEO_NEWQUAY Porth Joke 6 5h 5m -
South West Water OLD HILL SPS_PSCSOEO_FALMOUTH Penryn River 4 5h 2m -
South West Water OLD BRIDGE ST CAR PARK_CSO_TRURO River Allen 1 4h 54m -
South West Water NEWHAM ROAD SPST_PSCSOEO_TRURO Truro River 3 4h 29m -
South West Water CARNON DOWNS STW_SO_CARNON DOWNS Carnon River 6 3h 37m -
South West Water ST GEORGES ROAD_CSO_TRURO River Kenwyn 5 3h 17m -
South West Water NEWHAM ROAD SPST_PSCSOEO_TRURO Truro River 3 3h 14m -
South West Water CRANTOCK BEACH SPS_PSCSOEO_CRANTOCK Crantock Beach 2 2h 51m -
South West Water CRANTOCK BEACH SPS_PSCSOEO_CRANTOCK Crantock Beach 3 2h 36m 0 h
South West Water TREGONY SPST_PSCSOEO_TREGONY River Fal 2 2h 17m -
South West Water CALENICK SPST_PSCSOEO_TRURO River Tinney 2 1h 52m -
South West Water HENDRA RD_CSO_TRURO River Kenwyn 6 1h 46m -
South West Water CALENICK ST REPEATER STATION_CSO_TRURO River Kenwyn Via Sws 6 1h 34m -
South West Water CAMPFIELD HILL_CSO_TRURO River Allen 3 1h 11m -
South West Water ST CLEMENTS HILL_CSO_TRURO River Allen Via Sws 4 1h 6m -
South West Water VERYAN STW_SO_VERYAN Carne Stream 2 1h 5m -
South West Water DEVORAN SPS_PSCSOEO_DEVORAN River Carnon Estuary 2 0h 56m -
South West Water FAIRMANTLE ST CAR PARK_CSO_TRURO River Kenwyn 2 0h 38m -
South West Water TEHIDY TERRACE_CSO_FALMOUTH Penryn River 1 0h 37m -
South West Water PAULS TERRACE_CSO_TRURO River Allen 3 0h 35m 144 h
South West Water FRANCIS ST_CSO_TRURO River Kenwyn 4 0h 27m -
South West Water KING ST_CSO_TRURO River Kenwyn Via Sws 2 0h 26m -
South West Water PORTLOE FINESCN_PSCSOEO_PORTLOE English Channel 1 0h 17m -
South West Water ST GEORGES ROAD_CSO_TRURO River Kenwyn 1 0h 16m -
South West Water ROBERTS OPE_CSO_TRURO River Kenwyn[S] 0 0h -
South West Water MORLAIX AV_CSO_FYFFES SLIPWAY Truro River 0 0h -
South West Water WEBBER ST_CSO_FALMOUTH Penryn River 0 0h -
South West Water CHACEWATER STW_SO_CHACEWATER Unknown 0 0h -
South West Water LEMON MEWS_CSO_TRURO River Kenwyn 0 0h -
South West Water PORTLOE FINESCN_PSCSOEO_PORTLOE English Channel 0 0h -
South West Water PORTSCATHO INLET SPS_PSCSOEO_PORTSCATHO Pencabe Drang 0 0h -
South West Water ELLENGLAZE SPS_PSCSOEO_CUBERT Stream 0 0h -
South West Water FAIRMANTLE ST CAR PARK_CSO_TRURO River Kenwyn 0 0h -
South West Water WEBBER ST_CSO_FALMOUTH Penryn River 0 0h -
South West Water CALENICK ST REPEATER STATION_CSO_TRURO River Kenwyn Via Sws 0 0h -
South West Water TABERNACLE ST_CSO_TRURO River Kenwyn Via Sws 0 0h -
South West Water CAMPFIELD HILL_CSO_TRURO River Allen 0 0h -
South West Water SWANPOOL SPS_PSCSOEO_FALMOUTH Swanpool 0 0h 0 h
South West Water KING ST_CSO_TRURO River Kenwyn Via Sws 0 0h -
South West Water ST CLEMENTS HILL_CSO_TRURO River Allen Via Sws 0 0h -
South West Water NORTH PARADE_CSO_FALMOUTH Penryn River 0 0h -
South West Water RUZZA SPS_PSCSOEO_NEWQUAY Porth Joke 0 0h -
South West Water HENDRA RD_CSO_TRURO River Kenwyn 0 0h -
South West Water SWANPOOL SPS_PSCSOEO_FALMOUTH Swanpool 0 0h -
South West Water FRANCIS ST_CSO_TRURO River Kenwyn 0 0h -
South West Water MYLOR STW_SO_MYLOR BRIDGE Mylor Creek 0 0h -
South West Water TEHIDY TERRACE_CSO_FALMOUTH Penryn River 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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Analysing sewage pollution by the Water Industry

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Contains Water UK National Storm Overflow Hub Data CC-BY-SA 4.0 and analysis © 2025 Top-Of-The-Poops

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