Hatch Roundabout - Downstream : The Ching

London, Waltham Forest, United Kingdom

Observed by
Derek Seume
  • Observed on: Wed, 23 Jul 2025 17:00:00 +0100
  • Testers Derek Seume
  • Associated with:
    Thames21 : Lea Guardians
  • Lat: 51.6184562
  • Lng: 0.0086904

Observation report

See trends at this location

Water quality tests

Pending Quality Check from Water Rangers What's this?

Ammonia ppm What's this? 6.68
Phosphates total ppm What's this? 2.5

Qualitative

Algae What's this? No
Odour What's this? None
Clarity What's this? Clear
Water Flow What's this? Slow
Water Level What's this? Low
Water Colour What's this? Clear
On the water surface What's this? None

Weather

Current weather What's this?
Weather in previous 24 hours What's this?

Latest photos

Notes

Exceedingly (and abnormally) high ammonia reading this side of the roundabout (only 0.03 upstream, which is fairly typical here): something clearly coming out of one of the outfalls in the centre of the roundabout. So high/abnormal that I assumed user error, so I re-tested, but got a (slightly lower but still similarly) high reading again.