Folly pre confluence : Folly Brook

London, England, United Kingdom

Observed by
Judith Howlett

Observed on: Tue, 09 Sep 2025 09:35:00 +0100
Testers Jude and Nicky
Associated with:
Thames21 : Brent Catchment Water Quality Working Group
Lat: 51.6172613
Lng: -0.1894777

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Observation report

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Water quality tests

Pending Quality Check from Water Rangers What's this?

Ammonia ppm 1.78

Turbidity NTU 12.0

Phosphates total ppm 2.35

Qualitative

Algae No

Odour None

Clarity Clear

Pollution Residential discharge, Urban/road discharge

Water Flow Slow

Water Uses Other

Water Level Low

Water Colour Clear

On the water surface None

Weather

Current weather

sunny

Weather in previous 24 hours

sunny
cloudy
windy

Latest photos

Notes

Very slow running from Folly Brook down to Dollis, water most likely due to discharges rather than rain although some since last testing. Probably need to do a walk upstream and look at Outfalls