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Severn Estuary polluted by sewage 1,054 times in 2023 - lasting 10,949 hours

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Contains OS Data © Crown copyright & database right 2021-2023
© Top of the Poops 2021-2023
Totals for Severn Estuary in 2023
12 Sites polluted by Dwr Cymru Welsh Water
1,054 sewage dumps
10,949 h duration
That's 1.27 years! On average 2.9 times a day

Pollution Summary 2023

Here are all the reported sewage overflow totals for Severn Estuary in 2023. Sometimes sewage can be being dumped for months at a time.

These numbers are very slightly different from the Rivers page. We're working on it.

Company Waterway Site Sewage Dumps Duration (Hours) Reporting %
Dwr Cymru Welsh Water Severn Estuary WESTERN VALLEY TRUNK SEWER CSO 207 4,036 99.6
Dwr Cymru Welsh Water Severn Estuary RHYMNEY VALLEY TRUNK SEWER CSO 141 2,394 100
Dwr Cymru Welsh Water Severn Estuary Settled Storm Overflow at Cardiff Eastern District Pumping Station 127 1,205 100
Dwr Cymru Welsh Water Severn Estuary CARDIFF EAST DISTRICT LONG OUTFALL 127 1,205 100
Dwr Cymru Welsh Water Severn Estuary CARDIFF CENTRAL SPS TREMORFA 105 555 100
Dwr Cymru Welsh Water Severn Estuary LLANTWIT MAJOR WWTW (STW) WICK ROAD 69 465 100
Dwr Cymru Welsh Water Severn Estuary PENARTH HEAD SEWAGE PUMPING STATION 76 372 100
Dwr Cymru Welsh Water Severn Estuary BROCKHILL RISE & LAVERNOCK RD SSO'S 95 333 100
Dwr Cymru Welsh Water Severn Estuary Kimberley Road CSO 24 209 100
Dwr Cymru Welsh Water Severn Estuary Penarth Marina SPS 43 109 56.4
Dwr Cymru Welsh Water Severn Estuary KYMIN PS PENARTH CARDIFF , 38 61 100
Dwr Cymru Welsh Water Severn Estuary OCEAN PARK PS TREMORFA FORESHORE RO 2 1 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. This 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.