River Lynher at Notter Mill
EA name: RIVER LYNHER AT NOTTER MILL (also listed as “RSN0467 NOTTER MILL”)
Environment Agency sampling point SW-RSN0467 · 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
- 14 Jul 2026, 15:123 months ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 25 since 11 Oct 2023 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Monitoring (national agency policy)
- Where
- National Grid 238303, 61417As published, to the nearest 1 m. Open in a map
- River, by its own name
- Lynher
- River, by the map
- River LynherPlaced on the river its name gives, 1 m from the line.
- Next gauge downstream
- None tracedIts water reaches the sea without passing a gauge.
- Nearest gauge upstream
- Pillaton On the River Lynher · 2.0 km along the river
- Why it was sampled
- Monitoring (national agency policy) (19 samples)
Environmental monitoring statutory (EU directives) (6 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
98.5%
Sampled 14 Jul 2026, 3 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Jul 2026, 15:12 | 98.5 | 98.5% |
| 16 Jun 2026, 12:09 | 98.6 | 98.6% |
| 12 May 2026, 12:10 | 100.5 | 100.5% |
| 23 Apr 2026, 12:12 | 100 | 100% |
| 9 Mar 2026, 13:30 | 99.6 | 99.6% |
| 20 Feb 2026, 14:55 | 98.9 | 98.9% |
| 22 Jan 2026, 11:43 | 100.2 | 100.2% |
| 2 Dec 2025, 14:54 | 97.8 | 97.8% |
| 18 Nov 2025, 12:58 | 101.8 | 101.8% |
| 2 Oct 2025, 14:16 | 97.8 | 97.8% |
| 4 Sep 2025, 13:21 | 95.9 | 95.9% |
| 12 Aug 2025, 14:31 | 96.1 | 96.1% |
| 25 Jul 2025, 13:20 | 99.5 | 99.5% |
| 9 Jun 2025, 11:05 | 97.8 | 97.8% |
| 12 May 2025, 10:43 | 94.8 | 94.8% |
| 24 Apr 2025, 11:36 | 101.3 | 101.3% |
| 31 Mar 2025, 12:05 | 100.2 | 100.2% |
| 14 Feb 2025, 11:00 | 99.8 | 99.8% |
| 22 Jan 2025, 15:09 | 99.8 | 99.8% |
| 7 Mar 2024, 13:23 | 98.6 | 98.6% |
| 5 Feb 2024, 12:07 | 98.2 | 98.2% |
| 15 Jan 2024, 10:54 | 95.5 | 95.5% |
| 12 Dec 2023, 12:49 | 97 | 97% |
| 9 Nov 2023, 13:31 | 99.4 | 99.4% |
| 11 Oct 2023, 12:50 | 98.6 | 98.6% |
Dissolved oxygen
as O2 · code 9924 · mg/l
8.9 mg/l
Sampled 14 Jul 2026, 3 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Jul 2026, 15:12 | 8.9 | 8.9 mg/l |
| 16 Jun 2026, 12:09 | 9.92 | 9.92 mg/l |
| 12 May 2026, 12:10 | 11 | 11 mg/l |
| 23 Apr 2026, 12:12 | 10.8 | 10.8 mg/l |
| 9 Mar 2026, 13:30 | 11 | 11 mg/l |
| 20 Feb 2026, 14:55 | 11.2 | 11.2 mg/l |
| 22 Jan 2026, 11:43 | 11.5 | 11.5 mg/l |
| 2 Dec 2025, 14:54 | 11 | 11 mg/l |
| 18 Nov 2025, 12:58 | 11.7 | 11.7 mg/l |
| 2 Oct 2025, 14:16 | 10.3 | 10.3 mg/l |
| 4 Sep 2025, 13:21 | 9.69 | 9.69 mg/l |
| 12 Aug 2025, 14:31 | 9.22 | 9.22 mg/l |
| 25 Jul 2025, 13:20 | 9.73 | 9.73 mg/l |
| 9 Jun 2025, 11:05 | 10.2 | 10.2 mg/l |
| 12 May 2025, 10:43 | 10 | 10 mg/l |
| 24 Apr 2025, 11:36 | 11.2 | 11.2 mg/l |
| 31 Mar 2025, 12:05 | 11.1 | 11.1 mg/l |
| 14 Feb 2025, 11:00 | 12.2 | 12.2 mg/l |
| 22 Jan 2025, 15:09 | 11.9 | 11.9 mg/l |
| 7 Mar 2024, 13:23 | 11.2 | 11.2 mg/l |
| 5 Feb 2024, 12:07 | 11.1 | 11.1 mg/l |
| 15 Jan 2024, 10:54 | 11.8 | 11.8 mg/l |
| 12 Dec 2023, 12:49 | 10.6 | 10.6 mg/l |
| 9 Nov 2023, 13:31 | 11 | 11 mg/l |
| 11 Oct 2023, 12:50 | 9.98 | 9.98 mg/l |
Water temperature
code 0076 · °C
20.2 °C
Sampled 14 Jul 2026, 3 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Jul 2026, 15:12 | 20.2 | 20.2 °C |
| 16 Jun 2026, 12:09 | 15 | 15 °C |
| 12 May 2026, 12:10 | 11.1 | 11.1 °C |
| 23 Apr 2026, 12:12 | 11.8 | 11.8 °C |
| 9 Mar 2026, 13:30 | 10.9 | 10.9 °C |
| 20 Feb 2026, 14:55 | 9.9 | 9.9 °C |
| 22 Jan 2026, 11:43 | 9.2 | 9.2 °C |
| 2 Dec 2025, 14:54 | 9.9 | 9.9 °C |
| 18 Nov 2025, 12:58 | 9.3 | 9.3 °C |
| 2 Oct 2025, 14:16 | 13 | 13 °C |
| 4 Sep 2025, 13:21 | 14.8 | 14.8 °C |
| 12 Aug 2025, 14:31 | 17.2 | 17.2 °C |
| 25 Jul 2025, 13:20 | 16.3 | 16.3 °C |
| 9 Jun 2025, 11:05 | 13.3 | 13.3 °C |
| 12 May 2025, 10:43 | 12.8 | 12.8 °C |
| 24 Apr 2025, 11:36 | 10.7 | 10.7 °C |
| 31 Mar 2025, 12:05 | 10.7 | 10.7 °C |
| 14 Feb 2025, 11:00 | 6.6 | 6.6 °C |
| 22 Jan 2025, 15:09 | 7.6 | 7.6 °C |
| 7 Mar 2024, 13:23 | 9.5 | 9.5 °C |
| 5 Feb 2024, 12:07 | 10 | 10 °C |
| 15 Jan 2024, 10:54 | 6.4 | 6.4 °C |
| 12 Dec 2023, 12:49 | 11.1 | 11.1 °C |
| 9 Nov 2023, 13:31 | 10.7 | 10.7 °C |
| 11 Oct 2023, 12:50 | 14.7 | 14.7 °C |
pH
code 0061
7.39
Sampled 14 Jul 2026, 3 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Jul 2026, 15:12 | 7.39 | 7.39 |
| 16 Jun 2026, 12:09 | 7.56 | 7.56 |
| 12 May 2026, 12:10 | 7.6 | 7.6 |
| 23 Apr 2026, 12:12 | 7.68 | 7.68 |
| 9 Mar 2026, 13:30 | 7.2 | 7.2 |
| 20 Feb 2026, 14:55 | 7.14 | 7.14 |
| 22 Jan 2026, 11:43 | 7.17 | 7.17 |
| 2 Dec 2025, 14:54 | 7.19 | 7.19 |
| 18 Nov 2025, 12:58 | 7.28 | 7.28 |
| 2 Oct 2025, 14:16 | 7.34 | 7.34 |
| 4 Sep 2025, 13:21 | 7.38 | 7.38 |
| 12 Aug 2025, 14:31 | 7.57 | 7.57 |
| 25 Jul 2025, 13:20 | 7.58 | 7.58 |
| 9 Jun 2025, 11:05 | 7.4 | 7.4 |
| 12 May 2025, 10:43 | 7.6 | 7.6 |
| 24 Apr 2025, 11:36 | 7.35 | 7.35 |
| 31 Mar 2025, 12:05 | 7.66 | 7.66 |
| 14 Feb 2025, 11:00 | 7.49 | 7.49 |
| 22 Jan 2025, 15:09 | 7.46 | 7.46 |
| 7 Mar 2024, 13:23 | 7.38 | 7.38 |
| 5 Feb 2024, 12:07 | 7.42 | 7.42 |
| 15 Jan 2024, 10:54 | 7.41 | 7.41 |
| 12 Dec 2023, 12:49 | 7.25 | 7.25 |
| 9 Nov 2023, 13:31 | 7.28 | 7.28 |
| 11 Oct 2023, 12:50 | 7.51 | 7.51 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.002 mg/l (not detected above this)
Sampled 14 Jul 2026, 3 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Jul 2026, 15:12 | <0.002 | below 0.002 mg/l (not detected above this) |
| 16 Jun 2026, 12:09 | 0.0052 | 0.0052 mg/l |
| 12 May 2026, 12:10 | 0.0059 | 0.0059 mg/l |
| 23 Apr 2026, 12:12 | 0.0038 | 0.0038 mg/l |
| 9 Mar 2026, 13:30 | 0.015 | 0.015 mg/l |
| 20 Feb 2026, 14:55 | 0.03 | 0.03 mg/l |
| 22 Jan 2026, 11:43 | 0.03 | 0.03 mg/l |
| 2 Dec 2025, 14:54 | 0.017 | 0.017 mg/l |
| 18 Nov 2025, 12:58 | 0.0082 | 0.0082 mg/l |
| 2 Oct 2025, 14:16 | <0.002 | below 0.002 mg/l (not detected above this) |
| 4 Sep 2025, 13:21 | 0.008 | 0.008 mg/l |
| 12 Aug 2025, 14:31 | <0.002 | below 0.002 mg/l (not detected above this) |
| 25 Jul 2025, 13:20 | 0.0075 | 0.0075 mg/l |
| 9 Jun 2025, 11:05 | 0.025 | 0.025 mg/l |
| 12 May 2025, 10:43 | 0.0027 | 0.0027 mg/l |
| 24 Apr 2025, 11:36 | 0.0028 | 0.0028 mg/l |
| 31 Mar 2025, 12:05 | 0.0052 | 0.0052 mg/l |
| 14 Feb 2025, 11:00 | 0.012 | 0.012 mg/l |
| 22 Jan 2025, 15:09 | 0.0097 | 0.0097 mg/l |
| 7 Mar 2024, 13:23 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Feb 2024, 12:07 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Jan 2024, 10:54 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Dec 2023, 12:49 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Nov 2023, 13:31 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Oct 2023, 12:50 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
2.5 mg/l
Sampled 14 Jul 2026, 3 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Jul 2026, 15:12 | 2.5 | 2.5 mg/l |
| 16 Jun 2026, 12:09 | 1.9 | 1.9 mg/l |
| 12 May 2026, 12:10 | 2.1 | 2.1 mg/l |
| 23 Apr 2026, 12:12 | 2.1 | 2.1 mg/l |
| 9 Mar 2026, 13:30 | 2.39 | 2.39 mg/l |
| 20 Feb 2026, 14:55 | 2.59 | 2.59 mg/l |
| 22 Jan 2026, 11:43 | 2.29 | 2.29 mg/l |
| 2 Dec 2025, 14:54 | 3 | 3 mg/l |
| 18 Nov 2025, 12:58 | 3 | 3 mg/l |
| 2 Oct 2025, 14:16 | 2.1 | 2.1 mg/l |
| 4 Sep 2025, 13:21 | 1.9 | 1.9 mg/l |
| 12 Aug 2025, 14:31 | 2.6 | 2.6 mg/l |
| 25 Jul 2025, 13:20 | 2.6 | 2.6 mg/l |
| 9 Jun 2025, 11:05 | 1.7 | 1.7 mg/l |
| 12 May 2025, 10:43 | 2.3 | 2.3 mg/l |
| 24 Apr 2025, 11:36 | 2.3 | 2.3 mg/l |
| 31 Mar 2025, 12:05 | 2.4 | 2.4 mg/l |
| 14 Feb 2025, 11:00 | 2.7 | 2.7 mg/l |
| 22 Jan 2025, 15:09 | 2.69 | 2.69 mg/l |
| 7 Mar 2024, 13:23 | 2.8 | 2.8 mg/l |
| 5 Feb 2024, 12:07 | 2.7 | 2.7 mg/l |
| 15 Jan 2024, 10:54 | 2.9 | 2.9 mg/l |
| 12 Dec 2023, 12:49 | 3 | 3 mg/l |
| 9 Nov 2023, 13:31 | 3.2 | 3.2 mg/l |
| 11 Oct 2023, 12:50 | 2.5 | 2.5 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.18 mg/l
Sampled 14 Jul 2026, 3 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Jul 2026, 15:12 | 0.18 | 0.18 mg/l |
| 16 Jun 2026, 12:09 | 0.062 | 0.062 mg/l |
| 12 May 2026, 12:10 | 0.094 | 0.094 mg/l |
| 23 Apr 2026, 12:12 | 0.04 | 0.04 mg/l |
| 9 Mar 2026, 13:30 | 0.027 | 0.027 mg/l |
| 20 Feb 2026, 14:55 | 0.02 | 0.02 mg/l |
| 22 Jan 2026, 11:43 | 0.018 | 0.018 mg/l |
| 2 Dec 2025, 14:54 | 0.019 | 0.019 mg/l |
| 18 Nov 2025, 12:58 | 0.025 | 0.025 mg/l |
| 2 Oct 2025, 14:16 | 0.051 | 0.051 mg/l |
| 4 Sep 2025, 13:21 | 0.11 | 0.11 mg/l |
| 12 Aug 2025, 14:31 | 0.22 | 0.22 mg/l |
| 25 Jul 2025, 13:20 | 0.17 | 0.17 mg/l |
| 9 Jun 2025, 11:05 | 0.065 | 0.065 mg/l |
| 12 May 2025, 10:43 | 0.054 | 0.054 mg/l |
| 24 Apr 2025, 11:36 | 0.025 | 0.025 mg/l |
| 31 Mar 2025, 12:05 | 0.052 | 0.052 mg/l |
| 14 Feb 2025, 11:00 | 0.031 | 0.031 mg/l |
| 22 Jan 2025, 15:09 | 0.036 | 0.036 mg/l |
| 7 Mar 2024, 13:23 | 0.015 | 0.015 mg/l |
| 5 Feb 2024, 12:07 | 0.031 | 0.031 mg/l |
| 15 Jan 2024, 10:54 | 0.02 | 0.02 mg/l |
| 12 Dec 2023, 12:49 | 0.018 | 0.018 mg/l |
| 9 Nov 2023, 13:31 | <0.01 | below 0.01 mg/l (not detected above this) |
| 11 Oct 2023, 12:50 | 0.043 | 0.043 mg/l |
Turbidity
code 6396 · NTU
2.8 NTU
Sampled 14 Jul 2026, 3 months ago · 15 results banked
Every result (15)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Jul 2026, 15:12 | 2.8 | 2.8 NTU |
| 16 Jun 2026, 12:09 | 1.4 | 1.4 NTU |
| 12 May 2026, 12:10 | 1.2 | 1.2 NTU |
| 23 Apr 2026, 12:12 | <1 | below 1 NTU (not detected above this) |
| 9 Mar 2026, 13:30 | 2.5 | 2.5 NTU |
| 20 Feb 2026, 14:55 | 3 | 3 NTU |
| 22 Jan 2026, 11:43 | 6.9 | 6.9 NTU |
| 2 Dec 2025, 14:54 | 6.9 | 6.9 NTU |
| 18 Nov 2025, 12:58 | 2.3 | 2.3 NTU |
| 2 Oct 2025, 14:16 | 1.5 | 1.5 NTU |
| 12 Aug 2025, 14:31 | 1.1 | 1.1 NTU |
| 25 Jul 2025, 13:20 | 1.2 | 1.2 NTU |
| 9 Jun 2025, 11:05 | 2.2 | 2.2 NTU |
| 12 May 2025, 10:43 | 2.4 | 2.4 NTU |
| 24 Apr 2025, 11:36 | 1.8 | 1.8 NTU |
Conductivity
at 25 °C · code 0077 · µS/cm
170 µS/cm
Sampled 14 Jul 2026, 3 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Jul 2026, 15:12 | 170 | 170 µS/cm |
| 16 Jun 2026, 12:09 | 140 | 140 µS/cm |
| 12 May 2026, 12:10 | 160 | 160 µS/cm |
| 23 Apr 2026, 12:12 | 150 | 150 µS/cm |
| 9 Mar 2026, 13:30 | 140 | 140 µS/cm |
| 20 Feb 2026, 14:55 | 140 | 140 µS/cm |
| 22 Jan 2026, 11:43 | 130 | 130 µS/cm |
| 2 Dec 2025, 14:54 | 150 | 150 µS/cm |
| 18 Nov 2025, 12:58 | 150 | 150 µS/cm |
| 2 Oct 2025, 14:16 | 150 | 150 µS/cm |
| 12 Aug 2025, 14:31 | 180 | 180 µS/cm |
| 25 Jul 2025, 13:20 | 170 | 170 µS/cm |
| 9 Jun 2025, 11:05 | 140 | 140 µS/cm |
| 12 May 2025, 10:43 | 160 | 160 µS/cm |
| 24 Apr 2025, 11:36 | 150 | 150 µS/cm |
| 31 Mar 2025, 12:05 | 154 | 154 µS/cm |
| 14 Feb 2025, 11:00 | 149 | 149 µS/cm |
| 22 Jan 2025, 15:09 | 148 | 148 µS/cm |
| 7 Mar 2024, 13:23 | 139 | 139 µS/cm |
| 5 Feb 2024, 12:07 | 144 | 144 µS/cm |
| 15 Jan 2024, 10:54 | 145 | 145 µS/cm |
| 12 Dec 2023, 12:49 | 142 | 142 µS/cm |
| 9 Nov 2023, 13:31 | 145 | 145 µS/cm |
| 11 Oct 2023, 12:50 | 150 | 150 µS/cm |
Everything measured here
25 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 25 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 25 | Oct 2023 – Jul 2026 | 98.5% 14 Jul 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 25 | Oct 2023 – Jul 2026 | 8.9 mg/l 14 Jul 2026 |
| Temperature of Water 0076 | River water | 25 | Oct 2023 – Jul 2026 | 20.2 °C 14 Jul 2026 |
| pH 0061 | River water | 25 | Oct 2023 – Jul 2026 | 7.39 14 Jul 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 25 | Oct 2023 – Jul 2026 | below 0.002 mg/l 14 Jul 2026 |
| Nitrate as N 0117 | River water | 25 | Oct 2023 – Jul 2026 | 2.5 mg/l 14 Jul 2026 |
| Orthophosphate, reactive as P 0180 | River water | 25 | Oct 2023 – Jul 2026 | 0.18 mg/l 14 Jul 2026 |
| Turbidity 6396 | River water | 15 | Apr 2025 – Jul 2026 | 2.8 NTU 14 Jul 2026 |
| Conductivity at 25 C 0077 | River water | 24 | Oct 2023 – Jul 2026 | 170 µS/cm 14 Jul 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 25 | Oct 2023 – Jul 2026 | 27 mg/l 14 Jul 2026 |
| Ammonia un-ionised as N 0119 | River water | 25 | Oct 2023 – Jul 2026 | below 0.00002 mg/l 14 Jul 2026 |
| BOD : 5 Day ATU 0085 | River water | 16 | Apr 2025 – Jul 2026 | below 3 mg/l 14 Jul 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 19 | Jan 2025 – Jul 2026 | 2 mg/l 14 Jul 2026 |
| Chloride 0172 | River water | 19 | Jan 2025 – Jul 2026 | 18 mg/l 14 Jul 2026 |
| Chlorophyll : Acetone Extract 7887 | River water | 15 | Apr 2025 – Jul 2026 | 3.3 µg/l 14 Jul 2026 |
| Flow Type 2896 | River water | 19 | Jan 2025 – Jul 2026 | Moderate Flow 14 Jul 2026 |
| LCMS Screen : Semi Quantitative 7299 | River water | 2 | Feb 2026 – May 2026 | 1 text result 12 May 2026 |
| Nitrite as N 0118 | River water | 25 | Oct 2023 – Jul 2026 | 0.0028 mg/l 14 Jul 2026 |
| Nitrogen, Total Inorganic : (Calculated) 3683 | River water | 16 | Apr 2025 – Jul 2026 | 2.5 mg/l 14 Jul 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 25 | Oct 2023 – Jul 2026 | 2.5 mg/l 14 Jul 2026 |
| Phosphate :- {TIP} 0192 | River water | 16 | Apr 2025 – Jul 2026 | 0.19 mg/l 14 Jul 2026 |
| Phosphorus, Total as P 0348 | River water | 19 | Jan 2025 – Jul 2026 | 0.23 mg/l 14 Jul 2026 |
| Silica, reactive as SiO2 0182 | River water | 19 | Jan 2025 – Jul 2026 | 5.9 mg/l 14 Jul 2026 |
| Solids, Suspended at 105 C 0135 | River water | 16 | Apr 2025 – Jul 2026 | 9.4 mg/l 14 Jul 2026 |
| Weather : Precipitation 1183 | River water | 16 | Apr 2025 – Jul 2026 | Dry 14 Jul 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.