Withey Brook upstream of River Lynher
EA name: WITHEY BROOK U/S RIVER LYNHER (also listed as “WITHEY BROOK PRIOR TO RIVER LYNHER”)
Environment Agency sampling point SW-91253904 · 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
- 7 Sep 2026, 14:3831 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 14 since 2 Apr 2025 Imported periods: 1 Oct 2023 – 8 Oct 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Environmental monitoring statutory (EU directives) · results completed 16 Sep 2026
- Where
- National Grid 226100, 77230As published, to the nearest 10 m. Open in a map
- River, by its own name
- Withey Brook
- River, by the map
- Withey BrookPlaced on the river its name gives, 21 m from the line.
- Next gauge downstream
- Pillaton On the River Lynher · 23 km along the river
- Nearest gauge upstream
- Bastreet On the Withy Brook · 2.1 km along the river
- Why it was sampled
- Environmental monitoring statutory (EU directives) (14 samples)
Results here were completed a median of 5 days after the sample was taken (2 to 9 days, 4 samples).
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
100.2%
Sampled 7 Sep 2026, 31 days ago · 14 results banked
Every result (14)
| Sampled | Result as published | Reads as |
|---|---|---|
| 7 Sep 2026, 14:38 | 100.2 | 100.2% |
| 17 Aug 2026, 12:43 | 101.9 | 101.9% |
| 13 Jul 2026, 11:41 | 101.4 | 101.4% |
| 16 Jun 2026, 12:12 | 100.2 | 100.2% |
| 6 May 2026, 12:58 | 101.6 | 101.6% |
| 20 Apr 2026, 14:46 | 102.1 | 102.1% |
| 7 Apr 2026, 13:48 | 101.1 | 101.1% |
| 3 Mar 2026, 10:36 | 100 | 100% |
| 13 Feb 2026, 11:21 | 100 | 100% |
| 26 Jan 2026, 11:13 | 99.5 | 99.5% |
| 9 Dec 2025, 10:39 | 100.8 | 100.8% |
| 3 Nov 2025, 13:31 | 99.4 | 99.4% |
| 8 Oct 2025, 14:14 | 99.9 | 99.9% |
| 2 Apr 2025, 13:39 | 100.9 | 100.9% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.82 mg/l
Sampled 7 Sep 2026, 31 days ago · 14 results banked
Every result (14)
| Sampled | Result as published | Reads as |
|---|---|---|
| 7 Sep 2026, 14:38 | 9.82 | 9.82 mg/l |
| 17 Aug 2026, 12:43 | 9.64 | 9.64 mg/l |
| 13 Jul 2026, 11:41 | 9.65 | 9.65 mg/l |
| 16 Jun 2026, 12:12 | 10.4 | 10.4 mg/l |
| 6 May 2026, 12:58 | 11.2 | 11.2 mg/l |
| 20 Apr 2026, 14:46 | 11.4 | 11.4 mg/l |
| 7 Apr 2026, 13:48 | 10.7 | 10.7 mg/l |
| 3 Mar 2026, 10:36 | 11.4 | 11.4 mg/l |
| 13 Feb 2026, 11:21 | 11.7 | 11.7 mg/l |
| 26 Jan 2026, 11:13 | 11.9 | 11.9 mg/l |
| 9 Dec 2025, 10:39 | 10.9 | 10.9 mg/l |
| 3 Nov 2025, 13:31 | 10.8 | 10.8 mg/l |
| 8 Oct 2025, 14:14 | 10.6 | 10.6 mg/l |
| 2 Apr 2025, 13:39 | 11.5 | 11.5 mg/l |
Water temperature
code 0076 · °C
16.2 °C
Sampled 7 Sep 2026, 31 days ago · 14 results banked
Every result (14)
| Sampled | Result as published | Reads as |
|---|---|---|
| 7 Sep 2026, 14:38 | 16.2 | 16.2 °C |
| 17 Aug 2026, 12:43 | 17.9 | 17.9 °C |
| 13 Jul 2026, 11:41 | 17.6 | 17.6 °C |
| 16 Jun 2026, 12:12 | 13.7 | 13.7 °C |
| 6 May 2026, 12:58 | 11.1 | 11.1 °C |
| 20 Apr 2026, 14:46 | 10.4 | 10.4 °C |
| 7 Apr 2026, 13:48 | 12.5 | 12.5 °C |
| 3 Mar 2026, 10:36 | 9.4 | 9.4 °C |
| 13 Feb 2026, 11:21 | 8.4 | 8.4 °C |
| 26 Jan 2026, 11:13 | 7.7 | 7.7 °C |
| 9 Dec 2025, 10:39 | 11.6 | 11.6 °C |
| 3 Nov 2025, 13:31 | 11.6 | 11.6 °C |
| 8 Oct 2025, 14:14 | 12.4 | 12.4 °C |
| 2 Apr 2025, 13:39 | 9.6 | 9.6 °C |
pH
code 0061
7.13
Sampled 7 Sep 2026, 31 days ago · 14 results banked
Every result (14)
| Sampled | Result as published | Reads as |
|---|---|---|
| 7 Sep 2026, 14:38 | 7.13 | 7.13 |
| 17 Aug 2026, 12:43 | 7.01 | 7.01 |
| 13 Jul 2026, 11:41 | 7.45 | 7.45 |
| 16 Jun 2026, 12:12 | 6.8 | 6.8 |
| 6 May 2026, 12:58 | 7.11 | 7.11 |
| 20 Apr 2026, 14:46 | 7.35 | 7.35 |
| 7 Apr 2026, 13:48 | 6.76 | 6.76 |
| 3 Mar 2026, 10:36 | 6.2 | 6.2 |
| 13 Feb 2026, 11:21 | 6.67 | 6.67 |
| 26 Jan 2026, 11:13 | 6.5 | 6.5 |
| 9 Dec 2025, 10:39 | 5.91 | 5.91 |
| 3 Nov 2025, 13:31 | 6.3 | 6.3 |
| 8 Oct 2025, 14:14 | 6.83 | 6.83 |
| 2 Apr 2025, 13:39 | 7.02 | 7.02 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 7 Sep 2026, 31 days ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 7 Sep 2026, 14:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Aug 2026, 12:43 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Jul 2026, 11:41 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Jun 2026, 12:12 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 May 2026, 12:58 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Apr 2026, 14:46 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Mar 2026, 10:36 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Feb 2026, 11:21 | <0.03 | below 0.03 mg/l (not detected above this) |
| 26 Jan 2026, 11:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Dec 2025, 10:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Nov 2025, 13:31 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Oct 2025, 14:14 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
0.336 mg/l
Sampled 7 Sep 2026, 31 days ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 7 Sep 2026, 14:38 | 0.336 | 0.336 mg/l |
| 17 Aug 2026, 12:43 | 0.376 | 0.376 mg/l |
| 13 Jul 2026, 11:41 | 0.506 | 0.506 mg/l |
| 16 Jun 2026, 12:12 | 0.416 | 0.416 mg/l |
| 6 May 2026, 12:58 | 0.446 | 0.446 mg/l |
| 20 Apr 2026, 14:46 | 0.406 | 0.406 mg/l |
| 3 Mar 2026, 10:36 | 0.496 | 0.496 mg/l |
| 13 Feb 2026, 11:21 | 0.506 | 0.506 mg/l |
| 26 Jan 2026, 11:13 | 0.656 | 0.656 mg/l |
| 9 Dec 2025, 10:39 | 0.256 | 0.256 mg/l |
| 3 Nov 2025, 13:31 | 0.436 | 0.436 mg/l |
| 8 Oct 2025, 14:14 | 0.446 | 0.446 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
below 0.01 mg/l (not detected above this)
Sampled 7 Sep 2026, 31 days ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 7 Sep 2026, 14:38 | <0.01 | below 0.01 mg/l (not detected above this) |
| 17 Aug 2026, 12:43 | <0.01 | below 0.01 mg/l (not detected above this) |
| 13 Jul 2026, 11:41 | <0.01 | below 0.01 mg/l (not detected above this) |
| 16 Jun 2026, 12:12 | <0.01 | below 0.01 mg/l (not detected above this) |
| 6 May 2026, 12:58 | <0.01 | below 0.01 mg/l (not detected above this) |
| 20 Apr 2026, 14:46 | <0.01 | below 0.01 mg/l (not detected above this) |
| 3 Mar 2026, 10:36 | <0.01 | below 0.01 mg/l (not detected above this) |
| 13 Feb 2026, 11:21 | <0.01 | below 0.01 mg/l (not detected above this) |
| 26 Jan 2026, 11:13 | <0.01 | below 0.01 mg/l (not detected above this) |
| 9 Dec 2025, 10:39 | 0.013 | 0.013 mg/l |
| 3 Nov 2025, 13:31 | <0.01 | below 0.01 mg/l (not detected above this) |
| 8 Oct 2025, 14:14 | <0.01 | below 0.01 mg/l (not detected above this) |
Conductivity
at 25 °C · code 0077 · µS/cm
67 µS/cm
Sampled 7 Sep 2026, 31 days ago · 14 results banked
Every result (14)
| Sampled | Result as published | Reads as |
|---|---|---|
| 7 Sep 2026, 14:38 | 67 | 67 µS/cm |
| 17 Aug 2026, 12:43 | 67 | 67 µS/cm |
| 13 Jul 2026, 11:41 | 68 | 68 µS/cm |
| 16 Jun 2026, 12:12 | 62 | 62 µS/cm |
| 6 May 2026, 12:58 | 62 | 62 µS/cm |
| 20 Apr 2026, 14:46 | 61 | 61 µS/cm |
| 7 Apr 2026, 13:48 | 62 | 62 µS/cm |
| 3 Mar 2026, 10:36 | 63 | 63 µS/cm |
| 13 Feb 2026, 11:21 | 60 | 60 µS/cm |
| 26 Jan 2026, 11:13 | 67 | 67 µS/cm |
| 9 Dec 2025, 10:39 | 44 | 44 µS/cm |
| 3 Nov 2025, 13:31 | 65 | 65 µS/cm |
| 8 Oct 2025, 14:14 | 64 | 64 µS/cm |
| 2 Apr 2025, 13:39 | 64 | 64 µS/cm |
Everything measured here
12 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 12 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 14 | Apr 2025 – Sep 2026 | 100.2% 7 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 14 | Apr 2025 – Sep 2026 | 9.82 mg/l 7 Sep 2026 |
| Temperature of Water 0076 | River water | 14 | Apr 2025 – Sep 2026 | 16.2 °C 7 Sep 2026 |
| pH 0061 | River water | 14 | Apr 2025 – Sep 2026 | 7.13 7 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 12 | Oct 2025 – Sep 2026 | below 0.03 mg/l 7 Sep 2026 |
| Nitrate as N 0117 | River water | 12 | Oct 2025 – Sep 2026 | 0.336 mg/l 7 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 12 | Oct 2025 – Sep 2026 | below 0.01 mg/l 7 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 14 | Apr 2025 – Sep 2026 | 67 µS/cm 7 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 12 | Oct 2025 – Sep 2026 | below 8 mg/l 7 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 12 | Oct 2025 – Sep 2026 | below 0.00012 mg/l 7 Sep 2026 |
| Nitrite as N 0118 | River water | 12 | Oct 2025 – Sep 2026 | below 0.004 mg/l 7 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 12 | Oct 2025 – Sep 2026 | 0.34 mg/l 7 Sep 2026 |
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.