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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

Sewage15,603 hours

Monitoring offline1,533 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	78	1,857h 50m	-
South West Water	LUDGVAN SCHOOL_CSO_CROWLAS	Ludgvan Stream	68	1,373h 45m	-
South West Water	FISHERMANS SQUARE_CSO_MOUSEHOLE	Mounts Bay English Channel	75	1,351h 49m	-
South West Water	PERRANUTHNOE SPS_PSCSOEO_MARAZION	Unknown	65	1,258h 57m	-
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	44	700h 17m	-
South West Water	HELSTON STW_SSO_HELSTON	River Cober	46	663h 33m	-
South West Water	PORTHCURNO SPS_PSCSOEO_PENZANCE	Atlantic Ocean, Off Porthcurno	37	628h 33m	0 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	44	256h 13m	-
South West Water	BOTALLACK_PSCSOEO_TREGESEAL	Atlantic Ocean	29	246h 2m	1,125 h
South West Water	BOLITHO RD_CSO_PENZANCE	Surface Water Drain To Chyandr	65	223h 52m	-
South West Water	CADGWITH SPS_PSCSOEO_CADGWITH	English Channel	16	184h 29m	-
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	33	144h 27m	-
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	16	123h 24m	-
South West Water	BOSORNE RD 1_CSOEO_ST JUST	Atlantic / Porth Nanven Stream	32	117h 44m	-
South West Water	MERES VALLEY SPST_PSCSOEO_MULLION	Polurrian Cove	14	72h 46m	-
South West Water	ST BURYAN STW_SSO_ST BURYAN	Trevedran Stream	19	72h 1m	-
South West Water	LOWER BOSCASWELL_CSO_ST JUST	Atantic Ocean	37	68h 8m	-
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	40	56h 16m	-
South West Water	ATLANTIC HOTEL_CSO_ST MARYS	Atlantic Ocean	31	53h 32m	-
South West Water	BOSWEDDEN SPS_PSCSOEO_CAPE CORNWALL	Atlantic Ocean	16	45h 15m	-
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	11	21h	-
South West Water	BOSORNE RD 2_CSOEO_ST JUST	Atlantic / Porth Nanven Stream	14	18h 1m	-
South West Water	LONGROCK IND ESTATE SPS_PSCSOEO_LONGROCK	Mounts Bay	9	15h 12m	24 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	6	8h 21m	-
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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