Area of Outstanding Natural Beauty

Howardian Hills

Polluted by sewage 333 times in 2025 - lasting 2,144 hours

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Contains OS Data © Crown copyright & database right 2021-2024
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Totals for Howardian Hills in 2025

13 Sites polluted by Yorkshire Water
333 sewage dumps
2,144 hours duration
Sewage pollution map of Howardian Hills
Sewage pollution map of Howardian Hills, showing 333 overflows in 2025
That's 2.98 months. 6.4 times a week, on average

How does Howardian Hills compare?

Howardian Hills was the #24 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.

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Howardian Hills 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 Howardian Hills 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 %
Yorkshire Water Holbeck AMPLEFORTH VILLAGE STW 48 711 99
Yorkshire Water River Derwent HOWSHAM SEWAGE TREATMENT WORKS 31 372 100
Yorkshire Water Spital Beck FOSTON STW 36 274 100
Yorkshire Water Mill Hills Beck CONEYSTHORPE SEWAGE TREATMENT WORKS 15 236 100
Yorkshire Water River Rye HELMSLEY SEWAGE TREATMENT WORKS 50 209 100
Yorkshire Water River Kyle OULSTON SEWAGE TREATMENT WORKS 77 196 100
Yorkshire Water River Derwent CRAMBE STW 11 63 100
Yorkshire Water River Rye SAWMILL LANE CSO 25 37 100
Yorkshire Water Holbeck RYEDALE CARR LANE CSO 12 13 100
Yorkshire Water Holbeck AMPLEFORTH CSO 13 12 100
Yorkshire Water Marrs Beck HOVINGHAM SEWAGE TREATMENT WORKS 3 10 100
Yorkshire Water Wath Beck RYEDALE NEW ROAD CSO 9 4 100
Yorkshire Water Green'S Beck COXWOLD SEWAGE TREATMENT PLANT 3 2 100

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.