Chichester - 2025 Sewage

Polluted by sewage 7,414 hours in 2025

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

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View Annual Sewage Data

You're looking at the totals that we have calculated for sewage in Chichester for 2025. It is an estimate, based on very poor quality live data from the Water Companies. This may not align with the 'official' reported sewage values from the water companies, which is reported in April following then end of the year - so 2025 numbers are reported in April 2026.

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Constituencies near Chichester

Daily Data

We get information about overflowing CSOs since January 2025. Here is a chart of the last three months of data for Chichester, here you can see overflows in red, the darker the red, the more the CSO overflowed that day.

Each CSO has a row, the most recent data is on the right hand side.

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Daily data is experimental and data is not guaranteed to be accurate. Please inform us of any issue, we will fix.
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Totals so far

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Total Duration (days)
Southern Water LAVANT NO.1 SSO - 115745 River Lavant 163 3,571 h 53m 148.79
Southern Water CHICHESTER WTW 1 SSO - 115402 Chichester Harbour 50 723 h 34m 30.12
Southern Water SUMMER LANE PAGHAM SSO - 115443 Pagham Rife 27 562 h 20m 23.42
Southern Water BOSHAM SSO - 115735 Chichester Harbour Channel 20 303 h 22m 12.62
Southern Water TANGMERE SSO - 115777 Aldingbourne Rife 16 280 h 11.67
Southern Water SIDLESHAM SSO - 115807 Broad Rife 21 276 h 2m 11.5
Southern Water THORNHAM SSO - 115369 Chichester Hbr Via Little Deep 12 205 h 45m 8.54
Southern Water THORNHAM SSO - 115369 Chichester Hbr Via Little Deep 14 194 h 17m 8.08
Southern Water CHICHESTER WTW 1 SSO - 115402 Chichester Harbour 12 190 h 43m 7.92
Southern Water SIDLESHAM SSO - 115807 Broad Rife 12 173 h 26m 7.21
Southern Water Unknown Unknown 15 124 h 21m 5.17
Southern Water THORNHAM INLET CEO - 115371 Chichester Hbr Via Little Deep 10 111 h 38m 4.62
Southern Water LAVANT NO.1 SSO - 115745 River Lavant 5 110 h 1m 4.58
Southern Water THORNHAM INLET CEO - 115371 Chichester Hbr Via Little Deep 13 103 h 57m 4.29
Southern Water PRIORS LEAZE LANE NUTBOURNE CSO - 111267 Ham Brook 8 93 h 52m 3.88
Southern Water PRIORS LEAZE LANE NUTBOURNE CSO - 111267 Ham Brook 9 93 h 11m 3.88
Southern Water OUTSIDE 83 EAST BEACH SELSEY CEO - 115286 English Channel 10 59 h 58m 2.46
Southern Water BOSHAM SSO - 115735 Chichester Harbour Channel 5 57 h 21m 2.38
Southern Water MAIN ROAD HUNSTON CEO - 108280 Bremere Rife 3 39 h 27m 1.62
Southern Water OLD PORTSMOUTH ROAD CSO - 111371 Chichester Harbour 5 38 h 47m 1.58
Southern Water PAGHAM ROAD NORTH MUNDHAM CEO - 108291 Pagham Rife 3 33 h 47m 1.38
Southern Water SCHOOL LANE NUTBOURNE CEO - 108299 Ham Brook 2 23 h 48m 0.96
Southern Water CHIDHAM CEO - 108205 To Chichester Harbour 4 18 h 10m 0.75
Southern Water MAIN ROAD HUNSTON CEO - 108280 Bremere Rife 1 10 h 55m 0.42
Southern Water OLD PORTSMOUTH ROAD CSO - 111371 Chichester Harbour 1 5 h 23m 0.21
Southern Water CHICHESTER WTW 2 SSO - 115401 Chichester Harbour 4 4 h 45m 0.17
Southern Water CHICHESTER ROAD BOGNOR CSO - 103301 Bartons Lane Ald 1 3 h 3m 0.12
Southern Water Unknown Unknown 2 0 h 16m 0
Southern Water PAGHAM ROAD NORTH MUNDHAM CEO - 108291 Pagham Rife 1 0 h 3m 0
Southern Water EAST BEACH ROAD SELSEY CSO - 108220 English Channel 1 0 h 0
Southern Water CHIDHAM CEO - 108205 To Chichester Harbour 0 0 h 0
Southern Water SUMMER LANE PAGHAM SSO - 115443 Pagham Rife 0 0 h 0
Southern Water OUTSIDE 83 EAST BEACH SELSEY CEO - 115286 English Channel 0 0 h 0
Southern Water SCHOOL LANE NUTBOURNE CEO - 108299 Ham Brook 0 0 h 0
Southern Water TAYLORS LANE BOSHAM PUMPED SSO - 116066 Chichester Harbour 0 0 h 0
Southern Water CHICHESTER ROAD BOGNOR CSO - 103301 Bartons Lane Ald 0 0 h 0
Southern Water TANGMERE SSO - 115777 Aldingbourne Rife 0 0 h 0
Southern Water CHICHESTER WTW 2 SSO - 115401 Chichester Harbour 0 0 h 0

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

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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Β© Openstreetmap contributors, Contains OS data Β© Crown copyright and database right 2021-2025,
Contains Water UK National Storm Overflow Hub Data CC-BY-SA 4.0 and analysis Β© 2025 Top-Of-The-Poops

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