Observation

Saipem S5 - Tolworth Brook

Hogsmill

River or stream

View trends at this location

February 4, 2026 at 2:24 PM

QA status: Needs review

This observation is under review by Water Rangers, last updated on 2026-02-04, and has not been marked as checked yet. Details are below.

Review needed: chloride's result of 0ppm is below the normal range of 12.0ppm.

Weather observations

  • Current weather

    Community scientist interpretation

    • Sunny

  • Weather in the past 24hrs

    Community scientist interpretation

    • Cloudy
    • Rainy

Qualitative readings

  • Clarity

    Community scientist interpretation

    Cloudy

  • Water flow

    Community scientist interpretation

    Steady

  • Water level

    Community scientist interpretation

    High

  • Algae

    Community scientist interpretation

    None

  • Odour

    Community scientist interpretation

    Natural

  • Colour

    Community scientist interpretation

    Brown

  • Water surface

    Community scientist interpretation

    Natural debris

Chemistry tests

  • Air temperature

    °C

    Water Rangers (stream thermometer) and/or weather app

    12

  • Water temperature

    °C

    Water Rangers pen-type meter (temperature)

    10.4

  • Conductivity

    μS/cm

    Water Rangers pen-type meter (conductivity)

    650

  • Chlorine

    ppm

    Taylor teststrips (chlorine)

    0

  • Hardness

    ppm

    Taylor teststrips (hardness)

    200

  • Alkalinity

    ppm

    Taylor teststrips (alkalinity)

    140

  • Chloride

    ppm

    Unspecified equipment (chloride)

    0

  • pH

    Taylor teststrips (pH)

    8

  • Ammonia

    mg/L

    Hanna checker (ammonia - medium range)

    0.00

  • Nitrate-nitrogen

    mg/L

    Kyoritsu Packtest (nitrate-nitrogen)

    1.5

  • Phosphate-phosphorus

    mg/L

    Kyoritsu Packtest (phosphate-phosphorus)

    0.59

Physical tests

  • Water depth

    m

    Ruler (metric)

    0.4

Recent photos

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