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Area of Outstanding Natural Beauty

Cotswolds

Polluted by sewage 2,299 times in 2025 - lasting 19,008 hours - That's 2.2 years!

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Contains OS Data © Crown copyright & database right 2021-2024
© Top of the Poops 2021-2024

Totals for Cotswolds in 2025

88 Sites polluted by Severn Trent Water Thames Water Wessex Water
2,299 sewage dumps
19,008 hours duration
That's 2.2 years. On average 6.3 times a day

How does Cotswolds compare?

Cotswolds was the #7 most polluted Area of Outstanding Natural Beauty in England & Wales, by duration of sewage overflows, as reported by the water companies

Why the change?

Storm overflows spill when it rains, and 2025 was drier than 2024 - 90% of average annual rainfall against 105%.

So much of any drop is weather, not fixed pipes. The live page shows rainfall and sewage side by side, day by day.

Live Data

Take Action

Sewage pollution map of Cotswolds, showing 2,299 overflows in 2025
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Constituencies

Pollution Summary 2025

Here are all the reported sewage overflow totals for Cotswolds in 2025.

How we count, and how accurate it is

A CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway counts towards Cotswolds when it sits inside the designated area, or within 200 metres of its boundary. An overflow close to two AONBs is counted in both.

We use data from the water companies, but we are seeing many anomalies that make us believe that location information is quite poor. The situation is likely far worse than reported here.

Other CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s just outside the 200 metre boundary are not counted, though they may still affect water quality inside the area.

Company Waterway Site Sewage Dumps Duration (Hours) Reporting %
Wessex Water Luckington Brook GREAT BADMINTON WWTW 94 1,903 99.8
Wessex Water River Avon TETBURY WASTE WATER TREATMENT WORKS 78 1,495 98.6
Thames Water Evenlode STORM SEWAGE IRRIGATION AREA 77 1,143 99.9
Thames Water River Colne ANDOVERSFORD WWTW 61 1,137 99.9
Thames Water Littlestock Brook Milton-under-Wychwood 67 1,091 100
Wessex Water River Avon DIDMARTON WATER RECYCLING CENTRE 54 1,072 95.6
Thames Water Bledington Brook BLEDINGTON WWTW 50 946 99.7
Thames Water Windrush BOURTON ON THE WATER CSO 49 791 99.9
Severn Trent Water Nailsworth Stream AVENING SEWAGE TREATMENT WORKS 113 759 100
Severn Trent Water Laverton Brook LAVERTON SEWAGE TREATMENT WORKS 59 575 98.7
Severn Trent Water River Stour CHERINGTON STW 44 567 98.7
Wessex Water Byde Mill Brook/River Avon THINGLEY WATER RECYCLING CENTRE 38 508 99.9
Severn Trent Water Blockley Brook BLOCKLEY SEWAGE TREATMENT WORKS 32 479 100
Wessex Water River Frome WESTWOOD WATER RECYCLING CENTRE 30 421 99.2
Thames Water Little Compton Stream LITTLE COMPTON STW 30 414 99.8
Wessex Water By Brook BOX WASTEWATER TREATMENT WORKS 45 413 96.6
Thames Water Chadlingtonstream CHADLINGTON WWTW 35 362 100
Wessex Water Bristol Avon FRESHFORD WRC 32 360 99.9
Thames Water River Evenlode COMBE WASTEWATER TREATMENT WORKS 30 356 100
Severn Trent Water Tirle Brook TEDDINGTON - A435 SPS 53 341 100
Wessex Water By Brook LONG DEAN WASTEWATER TREATMENT WORK 58 292 99.9
Thames Water Blue Brook CHIPPING NORTON WWTW 21 277 100
Wessex Water Dyers Brook HACK MILL COMBINED SEWER OVERFLOW 57 192 100
Severn Trent Water Cam Brook CHIPPING CAMPDEN STW 25 178 99.7
Wessex Water Luckington Brook LUCKINGTON WATER RECYCLING CENTRE 13 178 92
Wessex Water By Brook MILL LANE PUMPING STATION 40 165 100
Thames Water River Windrush BURFORD WASTEWATER TREATMENT WORKS 12 152 100
Wessex Water River Avon TETBURY WASTE WATER TREATMENT WORKS 49 152 98.5
Thames Water River Evenlode FINSTOCK WWTW 13 143 100
Severn Trent Water River Isbourne WINCHCOMBE SEWAGE TREATMENT WORKS 29 141 87.9
Wessex Water Doverte Brook NORTH NIBLEY WATER RECYCLING CENTRE 16 138 100
Wessex Water River Avon OSTLING LANE CSO 48 129 95.1
Severn Trent Water Tirle Brook WOOLSTONE SEWAGE TREATMENT WORKS 28 129 97.7
Severn Trent Water River Isbourne TODDINGTON SEWAGE TREATMENT WORKS 18 113 99.9
Wessex Water River Avon Via Sws TRAFALGAR ROAD CSO 53 107 92.3
Wessex Water River Avon BRADFORD ON AVON WWTW 10 97 100
Thames Water Hanwell Brook WARMINGTON STW 15 83 98.2
Thames Water Cornwell Brook KINGHAM SEWAGE PUMPING STATION 17 79 99.8
Wessex Water Midford Brook MIDFORD PUMPING STATION 18 78 100
Wessex Water River Frome SHARPSTONE COMBINED SEWER OVERFLOW 29 63 98.9
Wessex Water River Avon ENTRY HILL GARDENS CSO 65 59 100
Thames Water River Evenlode CSO AT MORETON-IN-MARSH SPS 9 54 100
Wessex Water River Avon BARTON FARM CSO 8 53 95.8
Wessex Water River Avon Via Sws MEAD LANE PUMPING STATION 6 52 100
Wessex Water Burton Brook BURTON WASTEWATER TREATMENT WORKS 13 52 100
Thames Water Evenlode CHARLBURY WWTW 7 52 100
Wessex Water By Brook RECREATION GROUND 1 CSO 29 50 97.4
Severn Trent Water Carrant Brook LOWER MILL FARM CSO 19 49 100
Wessex Water Doncombe Brook MARSHFIELD WWTW 7 48 100
Wessex Water Midford Brook MILL LANE COMBINED SEWER OVERFLOW 49 45 95.4
Wessex Water Avon SHERSTON WASTEWATER TREATMENT WORKS 14 43 99.8
Severn Trent Water Badsey Brook SNOWSHILL SEWAGE PUMPING STATION 4 40 98.9
Wessex Water R Avon Via S/Water Sewer SALTFORD HIGH STREET CSO 38 37 97.5
Wessex Water River Avon Via Sws PRIOR PARK ROAD CSO 53 35 100
Thames Water River Leach NORTHLEACH WWTW 5 30 99.8
Wessex Water By Brook RECREATION GROUND 2 CSO 43 25 100
Wessex Water River Avon Via Sws LANSDOWN LANE COMBINED SEWER O'FLOW 14 24 97.5
Severn Trent Water River Chelt DOWDESWELL CSO 4 20 98.4
Wessex Water River Avon WINSLEY WATER RECYLING CENTRE 6 20 99.9
Severn Trent Water Blockley Brook SHEAFHOUSE FARM CSO 4 17 100
Wessex Water By Brook COLERNE WATER RECYLCING CENTRE 4 15 99.9
Wessex Water Dyers Brook WATER LANE CSO 23 14 100
Wessex Water River Frome NEW INN PUMPING STATION 4 13 99.9
Wessex Water Horsecombe Brook SUMMER LANE COMBINED SEWER OVERFLOW 27 12 100
Wessex Water Dyers Brook OLD COACH YARD CSO 37 12 100
Wessex Water River Avon POUND LANE CSO 4 10 100
Wessex Water River Avon THE TARTERS CSO 24 9 98.8
Wessex Water River Bristol Avon MILL HOUSE 10 8 76.5
Wessex Water River Avon HARPERS LANE CSO 3 6 100
Wessex Water Sherston Avon FOXLEY ROAD COMBINED SEWER OVERFLOW 21 5 96.9
Severn Trent Water Carrant Brook ASHTON UNDER HILL-CORNFIELD W CSO 2 5 99.8
Wessex Water River Avon Via Sws LYNCOMBE VALE CSO 15 5 91.1
Wessex Water Wellow Brook WELLOW WASTEWATER TREATMENT WORKS 2 5 100
Wessex Water River Avon Via Sws BEWDLEY ROAD CSO 15 4 93.9
Wessex Water Luckington Brook ALDERTON STW 2 4 99.6
Severn Trent Water River Isbourne WORMINGTON SEWAGE TREATMENT WORKS 4 3 98.7
Wessex Water River Avon Via Sws LYNCOMBE VALE CSO 18 3 93.2
Wessex Water Byde Mill Brook/River Avon THINGLEY WATER RECYCLING CENTRE 2 2 100
Wessex Water River Avon BATHEASTON GARDENS CSO 1 2 96.9
Wessex Water River Avon Via Sws FOX HILL WOODLANDS COTTAGE CSO 6 1 100
Wessex Water River Avon Via Sws PRIOR PARK ROAD CSO 9 1 97.3
Severn Trent Water Wagtail Brook UPPER TYSOE - SMARTS LANE SPS 5 1 100
Wessex Water River Avon Via Sws WIDCOMBE RISE CSO 12 0 100
Wessex Water River Avon Via Sws SOUTHLANDS COMBINED SEWER OVERFLOW 6 0 86.7
Thames Water Sor Brook RATLEY WWTW 1 0 100
Wessex Water Midford Brook MIDFORD COMBINED SEWER OVERFLOW 2 0 100
Severn Trent Water River Isbourne VINEYARD STREET CSO 1 0 100
Severn Trent Water Painswick Stream STEPPING STONE LANE CSO 2 0 100

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.

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Analysing sewage pollution by the Water Industry

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© Openstreetmap contributors, Contains OS data © Crown copyright and database right 2021-2025,
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