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Area of Outstanding Natural Beauty

Nidderdale

Polluted by sewage 1,052 times in 2025 - lasting 9,837 hours - That's 1.14 years!

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Totals for Nidderdale in 2025

24 Sites polluted by Yorkshire Water
1,052 sewage dumps
9,837 hours duration
That's 1.14 years. On average 2.9 times a day

How does Nidderdale compare?

Nidderdale was the #10 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 Nidderdale 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 Nidderdale 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 River Wharfe BEN RHYDDING (ILKLEY) WPC WORKS, ST 127 1,758 100
Yorkshire Water River Nidd DARLEY SEWAGE TREATMENT WORKS 97 1,490 100
Yorkshire Water River Nidd PATELEY BRIDGE STW 79 1,212 100
Yorkshire Water River Wharfe BURLEY/MENSTON (SHEFFIELD) STW 80 1,143 100
Yorkshire Water Tang Beck HIRST BRIDGE - KILLINGHALL NO.1 65 846 100
Yorkshire Water River Wharfe WYVIL CRESCENT CSO 80 594 100
Yorkshire Water River Burn SWINTON MASHAM STW 62 476 100
Yorkshire Water River Niidd SUMMERBRIDGE CSO 55 473 100
Yorkshire Water River Wharfe ADDINGHAM NO.1 STORM TANKS 41 370 100
Yorkshire Water River Nidd DACRE SEWAGE PUMPING STATION 48 281 100
Yorkshire Water River Nidd Via Sws NIDD WALK CSO 38 247 100
Yorkshire Water River Nidd DARLEY SEWAGE TREATMENT WORKS 33 151 100
Yorkshire Water Darley Beck DARLEY HEAD SEWAGE PUMPING STATION 23 138 100
Yorkshire Water Tranmire Goit GREWELTHORPE/GALPHAY/LAVERTON SCH 58 122 99.2
Yorkshire Water River Nidd PATELEY BRIDGE STW 15 112 100
Yorkshire Water West Beck ASKWITH SPS 29 98 99.8
Yorkshire Water Laver GALPHAY SEWAGE PUMPING STATION 35 97 100
Yorkshire Water River Wharfe ADDINGHAM NO.1 STORM TANKS 28 61 100
Yorkshire Water River Nidd GLASSHOUSES BRIDGE CSO 18 47 100
Yorkshire Water Kex Beck KIRKBY MALZEARD STW 21 43 100
Yorkshire Water River Nidd SHOW GROUND CSO 8 39 100
Yorkshire Water Town Beck LOW MILL LANE 179 CSO 6 17 95.8
Yorkshire Water River Nidd BIRSTWITH NO2 SPS 5 14 100
Yorkshire Water Broad Beck ELLINGSTRING CSO 1 0 99.9

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.