South West Water

was responsible for at least 56,173 sewage overflows in 2024
On average 153.9 times a day

These lasted for 544,439 hours (That's 63.01 years!) - in 1,159 different locations across their service area

South West Water has 11 CSOs dumping sewage right now

Here are the ones that have been overflowing for the longest, without interruption

We are getting more data collated for each of the CSOs... right now we just have the Constituency. Unfortunately, the water companies use different names for the CSOs in their live data than in the annual returns, so it will take a bit of time to link all the data up....

1. SWW0019

Truro and Falmouth

Started 44 minutes ago

2. SWW0117

St Ives

Started 36 minutes ago

3. SWW0479

Truro and Falmouth

Started 9 hours ago

4. SWW0506

Camborne and Redruth

Started 35 minutes ago

5. SWW0554

Truro and Falmouth

Started 32 minutes ago

6. SWW0681

St Ives

Started 40 minutes ago

7. SWW0779

Truro and Falmouth

Started 3 weeks ago

8. SWW0809

St Austell and Newquay

Started 8 hours ago

9. SWW1012

Honiton and Sidmouth

Started 2 days ago

How many Sewage Overflows are dumping sewage?

We have live data for South West Water so we can track what happens every day - given that overflows are supposed to happen on an 'exceptional' basis only - does the chart indicate that?

The red line indicates the number of CSOs that overflowed for at least 30mins, the grey, the number of CSOs that were offline for at least 30mins, and the blue line is the total number of CSOs that we can get information for.

There is daily updated information on all constituencies covered by South West Water

2024 - 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.

2024 - 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.

South West Water is highlighted in the plot below

2024 - Worst Locations South West Water

1. SALCOMBE REGIS WWTW CSO

Honiton and Sidmouth polluted for 8,772 hours, into Salcombe Regis Stream

366 incidents

That's 1.02 years!

On average 1 times a day

2. MORETONHAMPSTEAD WWTW

Central Devon polluted for 8,431 hours, into Wray Brook

385 incidents

That's 11.71 months.

On average 1.1 times a day

3. DULFORD PSCSO/EO

Honiton and Sidmouth polluted for 6,198 hours, into Weaver

283 incidents

That's 8.61 months.

5.4 times a week, on average

4. PAYHEMBURY STW

Honiton and Sidmouth polluted for 5,372 hours, into Payhembury Stream

279 incidents

That's 7.46 months.

5.4 times a week, on average

5. HONITON WASTEWATER TREATMENT WORKS

Honiton and Sidmouth polluted for 4,898 hours, into River Otter

369 incidents

That's 6.8 months.

On average 1 times a day

6. METHERELL WWTW

South East Cornwall polluted for 4,637 hours, into River Tamar

217 incidents

That's 6.44 months.

4.2 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.