Summary of quantitative results
Guidelines for exceedances are based on:
United Kingdom
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Chemistry tests
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Folly Brook/Dollis Brook in Barnet
Darlands Lake (Upstream) has data for clarity, on_the_water_s_surface, colour, odour, algae, previous_weather, current_weather, air_temperature, phosphates, water_temperature, turbidity, conductivity, ammonia, water_level, water_flow, current_weather_description, and previous_weather_description from 21 May 2023 to 22 December 2025.