Severn Trent Water

was responsible for at least 60,253 sewage overflows in 2023
On average 165.1 times a day

These lasted for 440,446 hours (That's 50.98 years!) - in 2,071 different locations across their service area

2023 - By Water Company

How does each water company compare? These are the totals by company for each. The totals are really high, counting things in hours doesn't make it very easy to think about. Here we show how many years of continuous sewage dumps happened in a single year, by water company.

2023 - Asset Spill Duration Comparison

It isn't like there are just a few outliers... the problem exists across the entire estate of water assets. Here we show a 'cumulative frequency diagram' - where the number of CSOs that dumped sewage for a time, or longer, is shown. You can see that many CSOs dumped sewage into a river for months and months.

Severn Trent Water is highlighted in the plot below

2023 - Worst Locations Severn Trent Water

1. FRAMPTON STW

Stroud polluted for 3,868 hours, into R Severn

206 incidents

That's 5.37 months.

4 times a week, on average

2. CHURCH STRETTON STW

South Shropshire polluted for 3,852 hours, into Quinny Brook

177 incidents

That's 5.35 months.

3.4 times a week, on average

3. CHERINGTON STW

Stratford-on-Avon polluted for 3,557 hours, into River Stour

173 incidents

That's 4.94 months.

3.3 times a week, on average

4. BLOCKLEY SEWAGE TREATMENT WORKS

North Cotswolds polluted for 3,535 hours, into Blockley Brook

178 incidents

That's 4.91 months.

3.4 times a week, on average

5. RIDGE LANE, ANSLEY STW

North Warwickshire and Bedworth polluted for 3,500 hours, into Bourne Brook

241 incidents

That's 4.86 months.

4.6 times a week, on average

6. BERKSWELL SEWAGE TREATMENT WORKS

Meriden and Solihull East polluted for 3,157 hours, into River Blythe

169 incidents

That's 4.38 months.

3.2 times a week, on average

Water Companies

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.