Chester

Polluted by sewage 601 times in 2025 lasting 2,166 hours

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Totals for Chester in 2025

27 Sites polluted by Dwr Cymru Welsh Water

601 sewage dumps

2,166 hours duration

Sewage pollution map of Chester: 2,166 hours in 2025

That's 3.01 months. On average 1.6 times a day

Change Over Time

Constituency for Chester

Nearby Constituencies

Waterways in Chester

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Chester in 2025. Sometimes sewage can be being dumped for months at a time.

Reporting refers to how much of the time the monitoring was active. In this place all the declared CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s appeared to have monitoring enabled for more than 50% of the year

Company	Waterway	Site	Sewage Dumps	Duration (Hours)	Reporting %
Dwr Cymru Welsh Water	Balderton Brook	SANDY LANE SPS CELYN CRESCENT SALTN	93	562	99.2
Dwr Cymru Welsh Water	Higher Ferry Drain	BRETTON PS	34	305	99.9
Dwr Cymru Welsh Water	River Dee	DEE LANE CSO	58	233	99.9
Dwr Cymru Welsh Water	River Dee	CHESTER WASTEWATER TREATMENT WORKS	26	149	99.9
Dwr Cymru Welsh Water	Highfield Drain	PARKGATE ROAD PS CHESTER ,	23	119	99.9
Dwr Cymru Welsh Water	River Dee	LITTLE ROODEE CSO	36	109	99.9
Dwr Cymru Welsh Water	River Dee	THE DINGLE CHESTER CSO	66	82	98.5
Dwr Cymru Welsh Water	River Dee	THE GROVES CSO	34	80	99.8
Dwr Cymru Welsh Water	River Dee	DEVA TERRACE CSO	44	78	96.6
Dwr Cymru Welsh Water	River Dee	CHESTER WEIR (SOUTH BANK) CSO	20	73	95.9
Dwr Cymru Welsh Water	Caldy Brook	THE RAKE AND PIKLE PUMPING STATION	4	60	99.9
Dwr Cymru Welsh Water	River Dee	CSO AT CHESTER STW	28	56	99.9
Dwr Cymru Welsh Water	Bache Brook	WEST OF WEALSTONE LANE CSO	27	51	94.7
Dwr Cymru Welsh Water	River Dee	GROSVENOR BRIDGE CSO	13	38	99.8
Dwr Cymru Welsh Water	Dee	ECCLESTON PUMPING STATION	4	37	99.9
Dwr Cymru Welsh Water	Bache Brook	CHESTER TROOPER INN CSO	14	36	98.9
Dwr Cymru Welsh Water	River Dee	CRANE STREET CSO	20	34	96
Dwr Cymru Welsh Water	River Dee	BOATHOUSE INN CSO	23	28	99.9
Dwr Cymru Welsh Water	Caldy Brook	CHRISTLETON WHITCHURCH ROAD PS	10	18	99.9
Dwr Cymru Welsh Water	River Dee	SALTNEY SEWERAGE CHESTER STREET PS	6	6	99.8
Dwr Cymru Welsh Water	River Dee	EDGAR PARK CSO	10	4	99.1
Dwr Cymru Welsh Water	Bache Brook	CHESTER PARKGATE COURT SPS	3	0	95.8
Dwr Cymru Welsh Water	Finchett'S Gutter	MOSTON ROAD CSO	1	0	99.9
Dwr Cymru Welsh Water	Finchett'S Gutter	DALESIDE COMBINED SEWER OVERFLOW	1	0	99.6
Dwr Cymru Welsh Water	River Dee	REAR OF 22 CURZON PARK NORTH CSO	1	0	99.7
Dwr Cymru Welsh Water	River Dee	SANDY LANE COMBINED SEWER OVERFLOW	1	0	99.9
Dwr Cymru Welsh Water	River Dee	THE DINGLE COMBINED SEWER OVERFLOW	1	0	99
Dwr Cymru Welsh Water	Balderton Brook	Saltney Bridge Street CSO	0	0	99.6
Dwr Cymru Welsh Water	Bache Brook	BACHE TANKS CSO	0	0	99.8
Dwr Cymru Welsh Water	River Dee	OLD DEE BRIDGE (NORTH BANK) CSO	0	0	99.9
Dwr Cymru Welsh Water	River Dee	CHESTER BELGRAVE PARK SPS	0	0	99.9
Dwr Cymru Welsh Water	Caldy Brook	CHRISTLETON OLD WOMAN'S LANE CSO	0	0	99.9
Dwr Cymru Welsh Water	River Dee	HANDBRIDGE GREENBANK SPS	0	0	99.9
Dwr Cymru Welsh Water	Balderton Brook	MARLSTON-CUM-LACHE PUMPING STATION	0	0	99.9

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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