River Lynher upstream of Golberdon sewage treatment works

EA name: RIVER LYNHER U/S GOLBERDON STW (also listed as “RIVER LYNHER ABOVE GOLBERDON STW”)
Environment Agency sampling point SW-91251650 · Freshwater - rivers · listed as open (“open” does not mean it is sampled now)

These are samples taken on a date, not live readings of the river. Results reach the Environment Agency's archive days to months after the sample is taken, so the newest here may be weeks or months old. FloodRadar does not grade them.

Where and when

Last sampled
22 May 2025, 11:0017 months ago · time as the Environment Agency records it (UK clock time; the source gives no time zone). Not sampled since, as far as the archive shows: the Environment Agency was asked up to 8 Oct 2026 and had nothing newer.
Samples banked
2 since 24 Apr 2025 Imported periods: 1 Oct 2023 – 8 Oct 2026. Samples outside them are not shown here.
Latest sample
River / running surface water Monitoring (national agency policy)
Where
National Grid 231940, 70950As published, to the nearest 10 m. Open in a map
River, by its own name
Lynher
River, by the map
River LynherPlaced on the river its name gives, 6 m from the line.
Next gauge downstream
Pillaton On the River Lynher · 12 km along the river
Nearest gauge upstream
Bastreet On the Withy Brook · 13 km along the river
Why it was sampled
Planned investigation (local monitoring) (1 samples)
Monitoring (national agency policy) (1 samples)

Main measurements, river water

Dissolved oxygen

% saturation · code 9901 · %

102.9%

Sampled 24 Apr 2025, 17 months ago · 1 result banked

90100110120%202420252026no sample published after Apr 202524 Apr 2025, 10:22: 102.9%
Every result (1)
SampledResult as publishedReads as
24 Apr 2025, 10:22102.9 102.9%

Water temperature

code 0076 · °C

9.9 °C

Sampled 24 Apr 2025, 17 months ago · 1 result banked

89101112°C202420252026no sample published after Apr 202524 Apr 2025, 10:22: 9.9 °C
Every result (1)
SampledResult as publishedReads as
24 Apr 2025, 10:229.9 9.9 °C

pH

code 0061

7.5

Sampled 22 May 2025, 17 months ago · 2 results banked

7.37.47.5202420252026no sample published after May 202524 Apr 2025, 10:22: 7.322 May 2025, 11:00: 7.5
Every result (2)
SampledResult as publishedReads as
22 May 2025, 11:007.5 7.5
24 Apr 2025, 10:227.3 7.3

Conductivity

at 25 °C · code 0077 · µS/cm

115 µS/cm

Sampled 24 Apr 2025, 17 months ago · 1 result banked

100110120130µS/cm202420252026no sample published after Apr 202524 Apr 2025, 10:22: 115 µS/cm
Every result (1)
SampledResult as publishedReads as
24 Apr 2025, 10:22115 115 µS/cm

Everything measured here

28 determinands, each kept by its code, unit and sample material: results in different units or on different materials are never mixed. A “below” result is under the laboratory's detection limit, not zero.

Show all 28 rows
DeterminandMaterialResults First – lastLatest result
Oxygen, Dissolved, % Saturation 9901 River water 1 Apr 2025 – Apr 2025 102.9% 24 Apr 2025
Temperature of Water 0076 River water 1 Apr 2025 – Apr 2025 9.9 °C 24 Apr 2025
pH 0061 River water 2 Apr 2025 – May 2025 7.5 22 May 2025
Conductivity at 25 C 0077 River water 1 Apr 2025 – Apr 2025 115 µS/cm 24 Apr 2025
Barium, Dissolved 9446 River water 2 Apr 2025 – May 2025 below 10 µg/l 22 May 2025
Boron, Dissolved 9447 River water 2 Apr 2025 – May 2025 below 100 µg/l 22 May 2025
Cadmium 0108 River water 2 Apr 2025 – May 2025 below 0.1 µg/l 22 May 2025
Cadmium, Dissolved 0106 River water 2 Apr 2025 – May 2025 below 0.1 µg/l 22 May 2025
Calcium, Dissolved 0239 River water 2 Apr 2025 – May 2025 8.4 mg/l 22 May 2025
Carbon, Organic, Dissolved as C :- {DOC} 0301 River water 2 Apr 2025 – May 2025 1.1 mg/l 22 May 2025
Copper 6452 River water 2 Apr 2025 – May 2025 6.8 µg/l 22 May 2025
Copper, Dissolved 6450 River water 2 Apr 2025 – May 2025 6 µg/l 22 May 2025
Hardness, Total as CaCO3 0158 River water 2 Apr 2025 – May 2025 32.9 mg/l 22 May 2025
Iron, Dissolved 6460 River water 2 Apr 2025 – May 2025 below 30 µg/l 22 May 2025
Lead 0050 River water 2 Apr 2025 – May 2025 below 2 µg/l 22 May 2025
Lead, Dissolved 0052 River water 2 Apr 2025 – May 2025 below 2 µg/l 22 May 2025
Lithium, Dissolved 4201 River water 2 Apr 2025 – May 2025 below 100 µg/l 22 May 2025
Magnesium, Dissolved 0235 River water 2 Apr 2025 – May 2025 2.9 mg/l 22 May 2025
Manganese, Dissolved 6458 River water 2 Apr 2025 – May 2025 below 10 µg/l 22 May 2025
Nickel 6462 River water 2 Apr 2025 – May 2025 below 1 µg/l 22 May 2025
Nickel, Dissolved 3410 River water 2 Apr 2025 – May 2025 below 1 µg/l 22 May 2025
Potassium, Dissolved 0209 River water 2 Apr 2025 – May 2025 1.5 mg/l 22 May 2025
Sodium, Dissolved 0205 River water 2 Apr 2025 – May 2025 9.2 mg/l 22 May 2025
Solids, Suspended at 105 C 0135 River water 2 Apr 2025 – May 2025 below 3 mg/l 22 May 2025
Strontium, Filtered 6693 River water 2 Apr 2025 – May 2025 27 µg/l 22 May 2025
Sulphate, Dissolved as SO4 7859 River water 2 Apr 2025 – May 2025 below 10 mg/l 22 May 2025
Zinc 6455 River water 2 Apr 2025 – May 2025 25 µg/l 22 May 2025
Zinc, Dissolved 3408 River water 2 Apr 2025 – May 2025 25 µg/l 22 May 2025

FloodRadar does not grade these results: there is no overall score, and official river classifications are a separate dataset. A sample taken downstream of an overflow does not by itself show where anything in it came from. River connections and distances are traced on OS Open Rivers (edition 2026-04), which leaves out many small channels.

Water samples: Environment Agency Water Quality Archive, © Environment Agency and/or database right 2026, Open Government Licence v3.0.

Contains OS data © Crown copyright and database rights 2026.