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You're looking at the totals that we have calculated for sewage in St Ives so far for 2026. It is an estimate, based on very poor quality live data from the Water Companies. The water companies report their sewage to the Environment Agency every year in April. You can see the last reported year in the other page

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.

Totals for St Ives in 2026

Sewage15,633 hours

Monitoring offline1,613 hours

Potential pollution34 hours

Storm overflows95

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Company	Site Name	Receiving Waterway	Overflow Days	Total Duration (hours)	Offline/Potential Pollution
South West Water	PRAZE AN BEEBLE STW_SSO_PRAZE AN BEEBLE	Unknown	99	2,334h 16m	-
South West Water	COT VALLEY_PSCSOEO_ST JUST	Atlantic / Porth Nanven Stream	79	1,858h 21m	-
South West Water	LUDGVAN SCHOOL_CSO_CROWLAS	Ludgvan Stream	68	1,373h 45m	-
South West Water	FISHERMANS SQUARE_CSO_MOUSEHOLE	Mounts Bay English Channel	78	1,353h 51m	-
South West Water	PERRANUTHNOE SPS_PSCSOEO_MARAZION	Unknown	67	1,260h 54m	-
South West Water	BOJEWYAN SPS_PSCSOEO_ST JUST	Stream	54	1,188h 41m	-
South West Water	TREGESEAL STW_SO_ST JUST	Tregaseal Stream	47	998h 7m	-
South West Water	THE LIZARD SPST_PSCSOEO_CHURCH COVE	English Channel	46	704h 53m	-
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	42 h
South West Water	ST KEVERNE STW_SSO_ST KEVERNE	Unknown	39	444h 56m	-
South West Water	GEEVOR MINE SPST_PSCSOEO_BOSCASWELL	Atlantic Ocean Coastal	33	307h 24m	-
South West Water	HELLARCHER SPS_PSCSOEO_THE LIZARD	English Channel	48	258h 28m	-
South West Water	BOTALLACK_PSCSOEO_TREGESEAL	Atlantic Ocean	30	246h 56m	1,125 h
South West Water	BOLITHO RD_CSO_PENZANCE	Surface Water Drain To Chyandr	68	230h 6m	-
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	FINNS_CSO_PENZANCE	Local Stream	34	145h 1m	-
South West Water	GLADSTONE TERRACE NORTH_CSO_PENZANCE	Longrock Stream	18	140h 54m	25 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	17	123h 28m	-
South West Water	BOSORNE RD 1_CSOEO_ST JUST	Atlantic / Porth Nanven Stream	33	118h	-
South West Water	ST BURYAN STW_SSO_ST BURYAN	Trevedran Stream	21	76h 10m	-
South West Water	MERES VALLEY SPST_PSCSOEO_MULLION	Polurrian Cove	14	72h 46m	-
South West Water	LOWER BOSCASWELL_CSO_ST JUST	Atantic Ocean	38	68h 52m	-
South West Water	CHURCH COVE RD SPS_PSCSOEO_CHURCH COVE	Church Cove	8	61h 18m	-
South West Water	COINAGEHALL ST_CSO_HELSTON	River Cober Via Sws	43	57h 54m	-
South West Water	ATLANTIC HOTEL_CSO_ST MARYS	Atlantic Ocean	31	53h 32m	-
South West Water	BOSWEDDEN SPS_PSCSOEO_CAPE CORNWALL	Atlantic Ocean	17	45h 54m	-
South West Water	HELSTON MARKET SPST_PSCSOEO_HELSTON	River Cober	4	29h 33m	-
South West Water	MOUSEHOLE SPS_PSCSOEO_MOUSEHOLE	Mounts Bay	20	25h 50m	-
South West Water	NANCHERROW HILL_CSO_ST JUST	Local Stream	12	21h 42m	-
South West Water	BOSORNE RD 2_CSOEO_ST JUST	Atlantic / Porth Nanven Stream	17	19h 29m	34 h
South West Water	LONGROCK IND ESTATE SPS_PSCSOEO_LONGROCK	Mounts Bay	9	15h 12m	27 h
South West Water	PORTHALLOW SPST_PSCSOEO_HELFORD	Porthallow Stream	3	13h 5m	363 h
South West Water	GRANGE RD S.A. TANK_CSO_HELSTON	River Cober	7	9h 45m	-
South West Water	NEW GRIMSBY SPS_PSCSOEO_TRESCO	Atlantic Ocean	7	9h 14m	-
South West Water	SOUTH SLIP_CSO_MOUSEHOLE	Mounts Bay English Channel	8	8h 1m	-
South West Water	PORTHGWIDDEN SPST_PSCSOEO_ST IVES	St Ives Bay	3	6h 20m	-
South West Water	GULVAL TREVARRACK LANE_CSO_PENZANCE	Local Stream	11	6h 12m	-
South West Water	PRAZE AN BEEBLE STW_SO_PRAZE AN BEEBLE	Unknown	4	2h 46m	-
South West Water	PORTHMINSTER SPS_PSCSOEO_PORTHMINSTER	St Ives Bay Atlantic Ocean	2	2h	-
South West Water	WESTCOTTS QUAY TANK_CSO_ST IVES	St Ives Bay	1	0h 35m	-
South West Water	GOLDSITHNEY SPS_PSCSOEO_GOLDSITHNEY	Stream	1	0h 19m	-
South West Water	CROWLAS BRIDGE SPS_PSCSOEO_CROWLAS	Red River	1	0h 3m	-
South West Water	THE LIZARD SPST_PSCSOEO_CHURCH COVE	English Channel	0	0h	-
South West Water	BOJEWYAN SPS_PSCSOEO_ST JUST	Stream	0	0h	-
South West Water	MERES VALLEY SPST_PSCSOEO_MULLION	Polurrian Cove	0	0h	-
South West Water	GULVAL TREVARRACK LANE_CSO_PENZANCE	Local Stream	0	0h	-
South West Water	COVERACK HARBOUR SPS_PSCSOEO_THE LIZARD	Coverack Cove	0	0h	-
South West Water	BREAGESIDE SPS_PSCSOEO_PORTHLEVEN	Mounts Bay, English Channel	0	0h	-
South West Water	CHYANDOUR SPST_PSCSOEO_PENZANCE	Mounts Bay	0	0h	-
South West Water	FINNS_CSO_PENZANCE	Local Stream	0	0h	-
South West Water	PERRANUTHNOE SPS_PSCSOEO_MARAZION	Unknown	0	0h	-
South West Water	LONGROCK IND ESTATE SPS_PSCSOEO_LONGROCK	Mounts Bay	0	0h	-
South West Water	COT VALLEY_PSCSOEO_ST JUST	Atlantic / Porth Nanven Stream	0	0h	-
South West Water	GLADSTONE TERRACE NORTH_CSO_PENZANCE	Longrock Stream	0	0h	-
South West Water	BOSORNE RD 2_CSOEO_ST JUST	Atlantic / Porth Nanven Stream	0	0h	-
South West Water	BOSWEDDEN SPS_PSCSOEO_CAPE CORNWALL	Atlantic Ocean	0	0h	-
South West Water	MOUSEHOLE SPS_PSCSOEO_MOUSEHOLE	Mounts Bay	0	0h	-
South West Water	HELSTON MARKET SPST_PSCSOEO_HELSTON	River Cober	0	0h	-
South West Water	ATLANTIC HOTEL_CSO_ST MARYS	Atlantic Ocean	0	0h	-
South West Water	ST KEVERNE STW_SSO_ST KEVERNE	Unknown	0	0h	-
South West Water	HARBOUR SPS_PSCSOEO_PORTHLEVEN	Mounts Bay	0	0h	-
South West Water	GOLDSITHNEY SPS_PSCSOEO_GOLDSITHNEY	Stream	0	0h	-
South West Water	CHYANDOUR SPST_PSCSOEO_PENZANCE	Mounts Bay	0	0h	-
South West Water	CHURCH COVE RD SPS_PSCSOEO_CHURCH COVE	Church Cove	0	0h	-
South West Water	COVERACK MILL SPST_PSCSOEO_THE LIZARD	Coverack Cove	0	0h	-
South West Water	NANCHERROW HILL_CSO_ST JUST	Local Stream	0	0h	-
South West Water	SENNEN SPS_PSCSOEO_LANDS END	Atlantic Ocean,Off Sennen Cove	0	0h	-
South West Water	PORTHMINSTER SPS_PSCSOEO_PORTHMINSTER	St Ives Bay Atlantic Ocean	0	0h	-
South West Water	ST BURYAN STW_SSO_ST BURYAN	Trevedran Stream	0	0h	-
South West Water	LAFLOUDER LANE SPS_PSCSOEO_MULLION	English Channel	0	0h	-
South West Water	WESTCOTTS QUAY TANK_CSO_ST IVES	St Ives Bay	0	0h	-
South West Water	FISHERMANS SQUARE_CSO_MOUSEHOLE	Mounts Bay English Channel	0	0h	-
South West Water	LOWER BOSCASWELL_CSO_ST JUST	Atantic Ocean	0	0h	-
South West Water	PORTHCURNO SPS_PSCSOEO_PENZANCE	Atlantic Ocean, Off Porthcurno	0	0h	-
South West Water	PRAZE AN BEEBLE STW_SSO_PRAZE AN BEEBLE	Unknown	0	0h	-
South West Water	HELLARCHER SPS_PSCSOEO_THE LIZARD	English Channel	0	0h	-
South West Water	PORTHGWIDDEN SPST_PSCSOEO_ST IVES	St Ives Bay	0	0h	-
South West Water	HELSTON STW_SSO_HELSTON	River Cober	0	0h	-
South West Water	TREGESEAL STW_SO_ST JUST	Tregaseal Stream	0	0h	-
South West Water	SHIPWRIGHTS SPS_PSCSOEO_HELFORD	Helford Creek	0	0h	-
South West Water	SOUTH SLIP_CSO_MOUSEHOLE	Mounts Bay English Channel	0	0h	-
South West Water	NEW GRIMSBY SPS_PSCSOEO_TRESCO	Atlantic Ocean	0	0h	-
South West Water	BOSORNE RD 1_CSOEO_ST JUST	Atlantic / Porth Nanven Stream	0	0h	-
South West Water	COINAGEHALL ST_CSO_HELSTON	River Cober Via Sws	0	0h	-
South West Water	LAFLOUDER LANE SPS_PSCSOEO_MULLION	English Channel	0	0h	-
South West Water	CADGWITH SPS_PSCSOEO_CADGWITH	English Channel	0	0h	-
South West Water	BOTALLACK_PSCSOEO_TREGESEAL	Atlantic Ocean	0	0h	-
South West Water	GEEVOR MINE SPST_PSCSOEO_BOSCASWELL	Atlantic Ocean Coastal	0	0h	-
South West Water	BOLITHO RD_CSO_PENZANCE	Surface Water Drain To Chyandr	0	0h	-
South West Water	SHIPWRIGHTS SPS_PSCSOEO_HELFORD	Helford Creek	0	0h	-
South West Water	LUDGVAN SCHOOL_CSO_CROWLAS	Ludgvan Stream	0	0h	-

St Ives - Live Sewage

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