Area of Outstanding Natural Beauty

Tamar Valley - Live Sewage

Polluted by sewage 18,143 hours in 2026 - That's 2.1 years , monitoring offline 9,303 hours , potential overflows 2,867 hours so far..

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Area of Outstanding Natural Beauty

Totals for Tamar Valley in 2026

Sewage18,143 hours

Monitoring offline9,303 hours

Potential pollution2,867 hours

Storm overflows82

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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 - 7,507 hours , 155 offline

Feb - 7,361 hours , 14 potential

Mar - 1,167 hours , 491 potential

Apr - 4 hours , 720 potential

May - 24 hours , 744 potential

Jun - 0 hours , 720 potential

Jul - 0 hours , 177 potential

Aug - 193 hours , 1,346 offline

Sept - 90 hours , 1,249 offline

Oct - 1,723 hours , 707 offline

Nov - 69 hours

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 Tamar Valley

Company	Site Name	Receiving Waterway	Overflow Days	Total Duration (hours)	Offline/Potential Pollution
South West Water	STOKE HILL STW_SSO_CRAPSTONE	Milton Stream	77	1,688h 43m	-
South West Water	GUNNISLAKE STW_SSO_GUNNISLAKE	River Tamar	82	1,617h 54m	-
South West Water	METHERELL STW_SSO_METHERELL	River Tamar	68	1,495h 9m	-
South West Water	STOKE HILL STW_SO_CRAPSTONE	Milton Stream	67	1,330h 39m	-
South West Water	BEALS MILL SPS_PSCSOEO_BEALS MILL	River Inny	57	1,185h 19m	-
South West Water	ST DOMINICK STW_SO_CALLINGTON	River Tamar Estuary	56	1,162h 48m	-
South West Water	MILTON ABBOT STW_SSO_MILTON ABBOT	River Tamar	62	1,160h 4m	-
South West Water	BERE ALSTON STW_SO_BERE ALSTON	Tidal River Tamar	64	934h 45m	-
South West Water	GUNNISLAKE NO. 2_CSO_GUNNISLAKE	River Tamar Via Sws	70	876h 19m	2,852 h
South West Water	ST DOMINICK_PSCSOEO_SALTASH	River Tamar	51	791h 16m	-
South West Water	LANDRAKE STW_SO_LANDRAKE	Landrake Stream	44	782h 5m	-
South West Water	ANTONY S T SEPTNK_SO_ANTONY	River Lynher Estuary	61	781h 18m	14 h
South West Water	BEALS MILL STW_SO_REZARE	River Inny	51	701h 26m	1 h
South West Water	HAREWOOD RD_CSO_CALSTOCK	River Tamar	69	584h 54m	-
South West Water	CROWNDALE_CSO_TAVISTOCK	River Tavy	56	551h 12m	158 h
South West Water	LATCHLEY STW_SO_GUNNISLAKE	River Tamar	25	378h 20m	-
South West Water	PLAYING FIELDS_PSCSOEO_CALSTOCK	River Tamar	58	341h 6m	-
South West Water	BUCKLAND MONACHORUM STW_SSO_BUCKLAND MON	River Tavy	29	318h 33m	185 h
South West Water	BERE ALSTON STW_SSO_BERE ALSTON	Unknown	41	316h 24m	-
South West Water	BERE FERRERS SPST_PSCSOEO_BERE FERRERS	River Tavy	49	206h 14m	-
South West Water	FORDER MAIN No1 SPS_PSCSOEO_SALTASH	River Lyner	15	157h 36m	565 h
South West Water	GUNNISLAKE STW_SO_GUNNISLAKE	River Tamar	39	128h 16m	924 h
South West Water	OLD MILL SPST_PSCSOEO_STOKE CLIMSLAND	Alren Stream	12	100h 23m	-
South West Water	CROWNDALE STW_SSO_TAVISTOCK	River Tavy	9	94h 31m	2,194 h
South West Water	ELIOT DRIVE SPS_PSCSOEO_ST GERMANS	Polbathic Lake	9	82h 6m	4,632 h
South West Water	CARGREEN SPS_PSCSOEO_CARGREEN	River Tamar	35	78h 44m	-
South West Water	ST MELLION_PSCSOEO_ST MELLION	St Mellion Stream	16	76h 20m	-
South West Water	ST GERMANS STW_SO_ST GERMANS	Polbathic Lake	12	56h 39m	-
South West Water	METHERELL STW_SO_METHERELL	River Tamar	14	52h 47m	-
South West Water	KELLY_PSCSOEO_CALSTOCK	River Tamar	18	42h 42m	-
South West Water	WILCOVE SPST_PSCSOEO_TORPOINT	Hamoaze	5	26h 56m	-
South West Water	BERE ALSTON_CSO_BERE ALSTON	River Tamar Via Sws	19	25h 2m	-
South West Water	POLBATHIC VILLAGE SPS_PSCSOEO_SALTASH	Polbathic Stream	7	10h 14m	-
South West Water	FORDER No2 SPS_PSCSOEO_SALTASH	River Lyner	3	3h 23m	565 h
South West Water	CHILSWORTHY STW_SO_GUNNISLAKE	River Tamar	11	2h 28m	75 h
South West Water	THE QUAY_CSO_CALSTOCK	River Tamar	2	0h 10m	-
South West Water	BEALS MILL STW_SO_REZARE	River Inny	0	0h	-
South West Water	BERE FERRERS SPST_PSCSOEO_BERE FERRERS	River Tavy	0	0h	-
South West Water	ST DOMINICK STW_SO_CALLINGTON	River Tamar Estuary	0	0h	-
South West Water	FORDER No2 SPS_PSCSOEO_SALTASH	River Lyner	0	0h	-
South West Water	LATCHLEY STW_SO_GUNNISLAKE	River Tamar	0	0h	-
South West Water	GUNNISLAKE STW_SO_GUNNISLAKE	River Tamar	0	0h	-
South West Water	METHERELL STW_SSO_METHERELL	River Tamar	0	0h	-
South West Water	ST MELLION COTTS_CSO_SALTASH	Stream	0	0h	-
South West Water	CHILSWORTHY STW_SO_GUNNISLAKE	River Tamar	0	0h	-
South West Water	OLD MILL SPST_PSCSOEO_STOKE CLIMSLAND	Alren Stream	0	0h	-
South West Water	CARGREEN SPS_PSCSOEO_CARGREEN	River Tamar	0	0h	-
South West Water	GUNNISLAKE STW_SSO_GUNNISLAKE	River Tamar	0	0h	-
South West Water	SHEVIOCK S T SEPTNK_SO_SHEVIOCK	River Lynher	0	0h	-
South West Water	KELLY_PSCSOEO_CALSTOCK	River Tamar	0	0h	-
South West Water	STOKE HILL STW_SSO_CRAPSTONE	Milton Stream	0	0h	-
South West Water	HAREWOOD RD_CSO_CALSTOCK	River Tamar	0	0h	-
South West Water	MILTON ABBOT_CSO_MILTON ABBOT	River Tamar	0	0h	-
South West Water	PLAYING FIELDS_PSCSOEO_CALSTOCK	River Tamar	0	0h	-
South West Water	CROWNDALE_CSO_TAVISTOCK	River Tavy	0	0h	-
South West Water	BERE ALSTON STW_SO_BERE ALSTON	Tidal River Tamar	0	0h	-
South West Water	ELIOT DRIVE SPS_PSCSOEO_ST GERMANS	Polbathic Lake	0	0h	-
South West Water	LANDRAKE SPS_PSCSOEO_LANDRAKE	River Lyner	0	0h	-
South West Water	ST MELLION_PSCSOEO_ST MELLION	St Mellion Stream	0	0h	-
South West Water	CROWNDALE STW_SSO_TAVISTOCK	River Tavy	0	0h	-
South West Water	MILTON ABBOT STW_SSO_MILTON ABBOT	River Tamar	0	0h	-
South West Water	STOKE HILL STW_SO_CRAPSTONE	Milton Stream	0	0h	-
South West Water	GUNNISLAKE NO. 2_CSO_GUNNISLAKE	River Tamar Via Sws	0	0h	-
South West Water	MILTON ABBOT_CSO_MILTON ABBOT	River Tamar	0	0h	-
South West Water	SHEVIOCK S T SEPTNK_SO_SHEVIOCK	River Lynher	0	0h	-
South West Water	GUNNISLAKE NO. 1_CSO_GUNNISLAKE	River Tamar	0	0h	-
South West Water	BERE ALSTON STW_SSO_BERE ALSTON	Unknown	0	0h	-
South West Water	LANDRAKE SPS_PSCSOEO_LANDRAKE	River Lyner	0	0h	-
South West Water	BERE ALSTON_CSO_BERE ALSTON	River Tamar Via Sws	0	0h	-
South West Water	ST MELLION COTTS_CSO_SALTASH	Stream	0	0h	-
South West Water	WILCOVE SPST_PSCSOEO_TORPOINT	Hamoaze	0	0h	-
South West Water	KINGSWOOD ROAD SPS_PSCSOEO_GUNNISLAKE	River Tamar	0	0h	-
South West Water	KINGSWOOD ROAD SPS_PSCSOEO_GUNNISLAKE	River Tamar	0	0h	-
South West Water	ANTONY S T SEPTNK_SO_ANTONY	River Lynher Estuary	0	0h	-
South West Water	FORDER MAIN No1 SPS_PSCSOEO_SALTASH	River Lyner	0	0h	-
South West Water	ST DOMINICK_PSCSOEO_SALTASH	River Tamar	0	0h	-
South West Water	BEALS MILL SPS_PSCSOEO_BEALS MILL	River Inny	0	0h	-
South West Water	THE QUAY_CSO_CALSTOCK	River Tamar	0	0h	-
South West Water	METHERELL STW_SO_METHERELL	River Tamar	0	0h	-
South West Water	LANDRAKE STW_SO_LANDRAKE	Landrake Stream	0	0h	-
South West Water	BUCKLAND MONACHORUM STW_SSO_BUCKLAND MON	River Tavy	0	0h	-
South West Water	POLBATHIC VILLAGE SPS_PSCSOEO_SALTASH	Polbathic 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.

Analysing sewage pollution by the Water Industry

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