Area of Outstanding Natural Beauty

Chichester Harbour - 2025 Sewage

Polluted by sewage 2,198 hours in 2025

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

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Totals for Chichester Harbour in 2025

Sewage2,198 hours
Monitoring offline0 hours
Potential pollution0 hours
Storm overflows22

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Daily Data - when it rained, and when they spilled

Square = rainfall none → heavy
Drop = sewage minutes → all day
Potential pollution Monitoring offline
Jan - 957 hours
Feb - 321 hours
Mar - 90 hours
Apr - 0 hours
May - 0 hours
Jun - 0 hours
Jul - 10 hours
Aug - 56 hours
Sept - 13 hours
Oct - 60 hours
Nov - 0 hours
Dec - 688 hours

Storm overflows in and around Chichester Harbour

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Offline/Potential Pollution
Southern Water CHICHESTER WTW 1 SSO - 115402 Chichester Harbour 50 723h 34m -
Southern Water BOSHAM SSO - 115735 Chichester Harbour Channel 20 303h 22m -
Southern Water THORNHAM SSO - 115369 Chichester Hbr Via Little Deep 12 205h 45m -
Southern Water THORNHAM SSO - 115369 Chichester Hbr Via Little Deep 14 194h 17m -
Southern Water CHICHESTER WTW 1 SSO - 115402 Chichester Harbour 12 190h 43m -
Southern Water THORNHAM INLET CEO - 115371 Chichester Hbr Via Little Deep 10 111h 38m -
Southern Water THORNHAM INLET CEO - 115371 Chichester Hbr Via Little Deep 13 103h 57m -
Southern Water PRIORS LEAZE LANE NUTBOURNE CSO - 111267 Ham Brook 8 93h 52m -
Southern Water PRIORS LEAZE LANE NUTBOURNE CSO - 111267 Ham Brook 9 93h 11m -
Southern Water BOSHAM SSO - 115735 Chichester Harbour Channel 5 57h 21m -
Southern Water OLD PORTSMOUTH ROAD CSO - 111371 Chichester Harbour 5 38h 47m -
Southern Water KINGS ROAD EMSWORTH CSO - 109298 Nore Rithe/Emsworth Harbour 2 30h 6m -
Southern Water SCHOOL LANE NUTBOURNE CEO - 108299 Ham Brook 2 23h 48m -
Southern Water CHIDHAM CEO - 108205 To Chichester Harbour 4 18h 10m -
Southern Water OLD PORTSMOUTH ROAD CSO - 111371 Chichester Harbour 1 5h 23m -
Southern Water CHICHESTER WTW 2 SSO - 115401 Chichester Harbour 4 4h 45m -
Southern Water KINGS ROAD EMSWORTH CSO - 109298 Nore Rithe/Emsworth Harbour 0 0h -
Southern Water CHIDHAM CEO - 108205 To Chichester Harbour 0 0h -
Southern Water THORNHAM FORMULA A CSO - 115370 Chichester Hbr Via Little Deep 0 0h -
Southern Water SCHOOL LANE NUTBOURNE CEO - 108299 Ham Brook 0 0h -
Southern Water TAYLORS LANE BOSHAM PUMPED SSO - 116066 Chichester Harbour 0 0h -
Southern Water CHICHESTER WTW 2 SSO - 115401 Chichester Harbour 0 0h -

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.