River Tamar at Dexbeer Bridge
EA name: RIVER TAMAR AT DEXBEER BRIDGE
Environment Agency sampling point SW-91210261 · 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
- 28 Sep 2026, 10:3710 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 20 since 20 Oct 2023 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 1 Oct 2026
- Where
- National Grid 229530, 108950As published, to the nearest 10 m. Open in a map
- River, by its own name
- Tamar
- River, by the map
- River TamarPlaced on the river its name gives, 3 m from the line.
- Next gauge downstream
- Tamarstone Bridge On the River Tamar · 6.4 km along the riverTamarstone Bridge 6.4 km along the river
- Why it was sampled
- Environmental monitoring statutory (EU directives) (13 samples)
Planned investigation (local monitoring) (7 samples)
Results here were completed a median of 3 days after the sample was taken (2 to 13 days, 4 samples).
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
93.8%
Sampled 28 Sep 2026, 10 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 28 Sep 2026, 10:37 | 93.8 | 93.8% |
| 27 Aug 2026, 10:37 | 84.9 | 84.9% |
| 14 Jul 2026, 11:37 | 88.4 | 88.4% |
| 8 Jun 2026, 12:30 | 95 | 95% |
| 21 May 2026, 11:39 | 100.9 | 100.9% |
| 22 Apr 2026, 11:43 | 107.3 | 107.3% |
| 11 Dec 2024, 11:56 | 97.9 | 97.9% |
| 4 Nov 2024, 10:34 | 93.9 | 93.9% |
| 9 Oct 2024, 12:13 | 96.1 | 96.1% |
| 13 Sep 2024, 12:10 | 99.4 | 99.4% |
| 2 Aug 2024, 11:40 | 94.9 | 94.9% |
| 11 Jul 2024, 12:49 | 95.2 | 95.2% |
| 4 Jun 2024, 12:02 | 92.9 | 92.9% |
| 5 Mar 2024, 11:32 | 96.9 | 96.9% |
| 5 Feb 2024, 11:59 | 98.7 | 98.7% |
| 23 Jan 2024, 12:42 | 98.5 | 98.5% |
| 5 Dec 2023, 12:56 | 97.6 | 97.6% |
| 6 Nov 2023, 12:29 | 94.9 | 94.9% |
| 25 Oct 2023, 10:32 | 93.6 | 93.6% |
| 20 Oct 2023, 11:08 | 97.4 | 97.4% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.73 mg/l
Sampled 28 Sep 2026, 10 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 28 Sep 2026, 10:37 | 9.73 | 9.73 mg/l |
| 27 Aug 2026, 10:37 | 8.08 | 8.08 mg/l |
| 14 Jul 2026, 11:37 | 8.13 | 8.13 mg/l |
| 8 Jun 2026, 12:30 | 9.68 | 9.68 mg/l |
| 21 May 2026, 11:39 | 10.2 | 10.2 mg/l |
| 22 Apr 2026, 11:43 | 12 | 12 mg/l |
| 11 Dec 2024, 11:56 | 12.1 | 12.1 mg/l |
| 4 Nov 2024, 10:34 | 10.2 | 10.2 mg/l |
| 9 Oct 2024, 12:13 | 9.97 | 9.97 mg/l |
| 13 Sep 2024, 12:10 | 10.8 | 10.8 mg/l |
| 2 Aug 2024, 11:40 | 9.3 | 9.3 mg/l |
| 11 Jul 2024, 12:49 | 9.55 | 9.55 mg/l |
| 4 Jun 2024, 12:02 | 9.34 | 9.34 mg/l |
| 5 Mar 2024, 11:32 | 11.7 | 11.7 mg/l |
| 5 Feb 2024, 11:59 | 11.4 | 11.4 mg/l |
| 23 Jan 2024, 12:42 | 11.7 | 11.7 mg/l |
| 5 Dec 2023, 12:56 | 11.7 | 11.7 mg/l |
| 6 Nov 2023, 12:29 | 10.5 | 10.5 mg/l |
| 25 Oct 2023, 10:32 | 10.2 | 10.2 mg/l |
| 20 Oct 2023, 11:08 | 10.3 | 10.3 mg/l |
Water temperature
code 0076 · °C
13.6 °C
Sampled 28 Sep 2026, 10 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 28 Sep 2026, 10:37 | 13.6 | 13.6 °C |
| 27 Aug 2026, 10:37 | 17.6 | 17.6 °C |
| 14 Jul 2026, 11:37 | 19.3 | 19.3 °C |
| 8 Jun 2026, 12:30 | 14.4 | 14.4 °C |
| 21 May 2026, 11:39 | 14.6 | 14.6 °C |
| 22 Apr 2026, 11:43 | 10.3 | 10.3 °C |
| 11 Dec 2024, 11:56 | 6.3 | 6.3 °C |
| 4 Nov 2024, 10:34 | 11.6 | 11.6 °C |
| 9 Oct 2024, 12:13 | 13.6 | 13.6 °C |
| 13 Sep 2024, 12:10 | 11.6 | 11.6 °C |
| 2 Aug 2024, 11:40 | 16.2 | 16.2 °C |
| 11 Jul 2024, 12:49 | 15.1 | 15.1 °C |
| 4 Jun 2024, 12:02 | 15 | 15 °C |
| 5 Mar 2024, 11:32 | 7.2 | 7.2 °C |
| 5 Feb 2024, 11:59 | 9.1 | 9.1 °C |
| 23 Jan 2024, 12:42 | 7.9 | 7.9 °C |
| 5 Dec 2023, 12:56 | 7.4 | 7.4 °C |
| 6 Nov 2023, 12:29 | 10.8 | 10.8 °C |
| 25 Oct 2023, 10:32 | 11.4 | 11.4 °C |
| 20 Oct 2023, 11:08 | 12.7 | 12.7 °C |
pH
code 0061
6.36
Sampled 28 Sep 2026, 10 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 28 Sep 2026, 10:37 | 6.36 | 6.36 |
| 27 Aug 2026, 10:37 | 7.64 | 7.64 |
| 14 Jul 2026, 11:37 | 7.46 | 7.46 |
| 8 Jun 2026, 12:30 | 7.26 | 7.26 |
| 21 May 2026, 11:39 | 7.43 | 7.43 |
| 22 Apr 2026, 11:43 | 7.87 | 7.87 |
| 11 Dec 2024, 11:56 | 7.46 | 7.46 |
| 4 Nov 2024, 10:34 | 7.35 | 7.35 |
| 9 Oct 2024, 12:13 | 7.22 | 7.22 |
| 13 Sep 2024, 12:10 | 7.54 | 7.54 |
| 2 Aug 2024, 11:40 | 7.93 | 7.93 |
| 11 Jul 2024, 12:49 | 7.47 | 7.47 |
| 4 Jun 2024, 12:02 | 7.67 | 7.67 |
| 5 Mar 2024, 11:32 | 7.2 | 7.2 |
| 5 Feb 2024, 11:59 | 7.37 | 7.37 |
| 23 Jan 2024, 12:42 | 7.46 | 7.46 |
| 5 Dec 2023, 12:56 | 7.08 | 7.08 |
| 6 Nov 2023, 12:29 | 7.38 | 7.38 |
| 25 Oct 2023, 10:32 | 7.29 | 7.29 |
| 20 Oct 2023, 11:08 | 7.37 | 7.37 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 28 Sep 2026, 10 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 28 Sep 2026, 10:37 | <0.03 | below 0.03 mg/l (not detected above this) |
| 27 Aug 2026, 10:37 | 0.062 | 0.062 mg/l |
| 14 Jul 2026, 11:37 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Jun 2026, 12:30 | 0.065 | 0.065 mg/l |
| 21 May 2026, 11:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Apr 2026, 11:43 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Dec 2024, 11:56 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Nov 2024, 10:34 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Oct 2024, 12:13 | 0.056 | 0.056 mg/l |
| 13 Sep 2024, 12:10 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Aug 2024, 11:40 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Jul 2024, 12:49 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Jun 2024, 12:02 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Mar 2024, 11:32 | 0.09 | 0.09 mg/l |
| 5 Feb 2024, 11:59 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Jan 2024, 12:42 | 0.083 | 0.083 mg/l |
| 5 Dec 2023, 12:56 | 0.056 | 0.056 mg/l |
| 6 Nov 2023, 12:29 | 0.037 | 0.037 mg/l |
| 25 Oct 2023, 10:32 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Oct 2023, 11:08 | 0.043 | 0.043 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
0.446 mg/l
Sampled 28 Sep 2026, 10 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 28 Sep 2026, 10:37 | 0.446 | 0.446 mg/l |
| 27 Aug 2026, 10:37 | 0.741 | 0.741 mg/l |
| 14 Jul 2026, 11:37 | 0.316 | 0.316 mg/l |
| 8 Jun 2026, 12:30 | 0.661 | 0.661 mg/l |
| 21 May 2026, 11:39 | 0.486 | 0.486 mg/l |
| 22 Apr 2026, 11:43 | 0.626 | 0.626 mg/l |
| 11 Dec 2024, 11:56 | 1.59 | 1.59 mg/l |
| 4 Nov 2024, 10:34 | 1.39 | 1.39 mg/l |
| 9 Oct 2024, 12:13 | 1.08 | 1.08 mg/l |
| 13 Sep 2024, 12:10 | 1.1 | 1.1 mg/l |
| 2 Aug 2024, 11:40 | 0.656 | 0.656 mg/l |
| 11 Jul 2024, 12:49 | 0.816 | 0.816 mg/l |
| 4 Jun 2024, 12:02 | 0.976 | 0.976 mg/l |
| 5 Mar 2024, 11:32 | 1.78 | 1.78 mg/l |
| 5 Feb 2024, 11:59 | 1.99 | 1.99 mg/l |
| 23 Jan 2024, 12:42 | 1.88 | 1.88 mg/l |
| 5 Dec 2023, 12:56 | 1.88 | 1.88 mg/l |
| 6 Nov 2023, 12:29 | 1.79 | 1.79 mg/l |
| 25 Oct 2023, 10:32 | 1.29 | 1.29 mg/l |
| 20 Oct 2023, 11:08 | 1.39 | 1.39 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.026 mg/l
Sampled 28 Sep 2026, 10 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 28 Sep 2026, 10:37 | 0.026 | 0.026 mg/l |
| 27 Aug 2026, 10:37 | 0.069 | 0.069 mg/l |
| 14 Jul 2026, 11:37 | 0.032 | 0.032 mg/l |
| 8 Jun 2026, 12:30 | 0.077 | 0.077 mg/l |
| 21 May 2026, 11:39 | 0.027 | 0.027 mg/l |
| 22 Apr 2026, 11:43 | 0.017 | 0.017 mg/l |
| 11 Dec 2024, 11:56 | 0.023 | 0.023 mg/l |
| 4 Nov 2024, 10:34 | 0.023 | 0.023 mg/l |
| 9 Oct 2024, 12:13 | 0.034 | 0.034 mg/l |
| 13 Sep 2024, 12:10 | 0.024 | 0.024 mg/l |
| 2 Aug 2024, 11:40 | 0.036 | 0.036 mg/l |
| 11 Jul 2024, 12:49 | 0.016 | 0.016 mg/l |
| 4 Jun 2024, 12:02 | 0.036 | 0.036 mg/l |
| 5 Mar 2024, 11:32 | 0.036 | 0.036 mg/l |
| 5 Feb 2024, 11:59 | 0.04 | 0.04 mg/l |
| 23 Jan 2024, 12:42 | 0.041 | 0.041 mg/l |
| 5 Dec 2023, 12:56 | 0.037 | 0.037 mg/l |
| 6 Nov 2023, 12:29 | <0.01 | below 0.01 mg/l (not detected above this) |
| 25 Oct 2023, 10:32 | 0.021 | 0.021 mg/l |
| 20 Oct 2023, 11:08 | 0.022 | 0.022 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
170 µS/cm
Sampled 28 Sep 2026, 10 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 28 Sep 2026, 10:37 | 170 | 170 µS/cm |
| 27 Aug 2026, 10:37 | 182 | 182 µS/cm |
| 14 Jul 2026, 11:37 | 179 | 179 µS/cm |
| 8 Jun 2026, 12:30 | 151 | 151 µS/cm |
| 21 May 2026, 11:39 | 152 | 152 µS/cm |
| 22 Apr 2026, 11:43 | 146 | 146 µS/cm |
| 11 Dec 2024, 11:56 | 142 | 142 µS/cm |
| 4 Nov 2024, 10:34 | 151 | 151 µS/cm |
| 9 Oct 2024, 12:13 | 145 | 145 µS/cm |
| 13 Sep 2024, 12:10 | 150 | 150 µS/cm |
| 2 Aug 2024, 11:40 | 188 | 188 µS/cm |
| 11 Jul 2024, 12:49 | 150 | 150 µS/cm |
| 4 Jun 2024, 12:02 | 162 | 162 µS/cm |
| 5 Mar 2024, 11:32 | 134 | 134 µS/cm |
| 5 Feb 2024, 11:59 | 152 | 152 µS/cm |
| 23 Jan 2024, 12:42 | 154 | 154 µS/cm |
| 5 Dec 2023, 12:56 | 150 | 150 µS/cm |
| 6 Nov 2023, 12:29 | 150 | 150 µS/cm |
| 25 Oct 2023, 10:32 | 155 | 155 µS/cm |
| 20 Oct 2023, 11:08 | 161 | 161 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 | 20 | Oct 2023 – Sep 2026 | 93.8% 28 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 20 | Oct 2023 – Sep 2026 | 9.73 mg/l 28 Sep 2026 |
| Temperature of Water 0076 | River water | 20 | Oct 2023 – Sep 2026 | 13.6 °C 28 Sep 2026 |
| pH 0061 | River water | 20 | Oct 2023 – Sep 2026 | 6.36 28 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 20 | Oct 2023 – Sep 2026 | below 0.03 mg/l 28 Sep 2026 |
| Nitrate as N 0117 | River water | 20 | Oct 2023 – Sep 2026 | 0.446 mg/l 28 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 20 | Oct 2023 – Sep 2026 | 0.026 mg/l 28 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 20 | Oct 2023 – Sep 2026 | 170 µS/cm 28 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 20 | Oct 2023 – Sep 2026 | 41 mg/l 28 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 20 | Oct 2023 – Sep 2026 | below 0.00002 mg/l 28 Sep 2026 |
| Nitrite as N 0118 | River water | 20 | Oct 2023 – Sep 2026 | below 0.004 mg/l 28 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 20 | Oct 2023 – Sep 2026 | 0.45 mg/l 28 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.