River Plym at Dunstone
EA name: RIVER PLYM AT DUNSTONE (also listed as “RSN1643 DUNSTONE”)
Environment Agency sampling point SW-RSN1643 · 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
- 17 Aug 2026, 11:2852 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 8 since 27 Jan 2026 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 255335, 64516As published, to the nearest 1 m. Open in a map
- River, by its own name
- Plym
- River, by the map
- River PlymPlaced on the river its name gives, 5 m from the line.
- Next gauge downstream
- CARNWOOD 6.4 km along the riverCarnwood On the River Plym · 6.4 km along the river
- Why it was sampled
- Monitoring (national agency policy) (8 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
104.8%
Sampled 17 Aug 2026, 52 days ago · 8 results banked
Every result (8)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Aug 2026, 11:28 | 104.8 | 104.8% |
| 17 Jul 2026, 14:15 | 104.6 | 104.6% |
| 4 Jun 2026, 10:38 | 100.5 | 100.5% |
| 12 May 2026, 11:17 | 103.7 | 103.7% |
| 30 Apr 2026, 12:18 | 105.5 | 105.5% |
| 27 Mar 2026, 13:00 | 102.8 | 102.8% |
| 10 Feb 2026, 13:11 | 101.5 | 101.5% |
| 27 Jan 2026, 12:05 | 100.1 | 100.1% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.36 mg/l
Sampled 17 Aug 2026, 52 days ago · 8 results banked
Every result (8)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Aug 2026, 11:28 | 9.36 | 9.36 mg/l |
| 17 Jul 2026, 14:15 | 8.84 | 8.84 mg/l |
| 4 Jun 2026, 10:38 | 10.5 | 10.5 mg/l |
| 12 May 2026, 11:17 | 11.1 | 11.1 mg/l |
| 30 Apr 2026, 12:18 | 11.1 | 11.1 mg/l |
| 27 Mar 2026, 13:00 | 11.6 | 11.6 mg/l |
| 10 Feb 2026, 13:11 | 11.6 | 11.6 mg/l |
| 27 Jan 2026, 12:05 | 12 | 12 mg/l |
Water temperature
code 0076 · °C
20.8 °C
Sampled 17 Aug 2026, 52 days ago · 8 results banked
Every result (8)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Aug 2026, 11:28 | 20.8 | 20.8 °C |
| 17 Jul 2026, 14:15 | 23.7 | 23.7 °C |
| 4 Jun 2026, 10:38 | 13.1 | 13.1 °C |
| 12 May 2026, 11:17 | 12.1 | 12.1 °C |
| 30 Apr 2026, 12:18 | 12.8 | 12.8 °C |
| 27 Mar 2026, 13:00 | 9.8 | 9.8 °C |
| 10 Feb 2026, 13:11 | 9.4 | 9.4 °C |
| 27 Jan 2026, 12:05 | 7.4 | 7.4 °C |
pH
code 0061
6.67
Sampled 17 Aug 2026, 52 days ago · 8 results banked
Every result (8)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Aug 2026, 11:28 | 6.67 | 6.67 |
| 17 Jul 2026, 14:15 | 7.03 | 7.03 |
| 4 Jun 2026, 10:38 | 6.63 | 6.63 |
| 12 May 2026, 11:17 | 6.46 | 6.46 |
| 30 Apr 2026, 12:18 | 6.84 | 6.84 |
| 27 Mar 2026, 13:00 | 6.36 | 6.36 |
| 10 Feb 2026, 13:11 | 5.82 | 5.82 |
| 27 Jan 2026, 12:05 | 5.4 | 5.4 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.0038 mg/l
Sampled 17 Aug 2026, 52 days ago · 8 results banked
Every result (8)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Aug 2026, 11:28 | 0.0038 | 0.0038 mg/l |
| 17 Jul 2026, 14:15 | 0.0024 | 0.0024 mg/l |
| 4 Jun 2026, 10:38 | <0.002 | below 0.002 mg/l (not detected above this) |
| 12 May 2026, 11:17 | <0.002 | below 0.002 mg/l (not detected above this) |
| 30 Apr 2026, 12:18 | <0.002 | below 0.002 mg/l (not detected above this) |
| 27 Mar 2026, 13:00 | <0.002 | below 0.002 mg/l (not detected above this) |
| 10 Feb 2026, 13:11 | <0.002 | below 0.002 mg/l (not detected above this) |
| 27 Jan 2026, 12:05 | <0.002 | below 0.002 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
0.027 mg/l
Sampled 17 Aug 2026, 52 days ago · 8 results banked
Every result (8)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Aug 2026, 11:28 | 0.027 | 0.027 mg/l |
| 17 Jul 2026, 14:15 | 0.011 | 0.011 mg/l |
| 4 Jun 2026, 10:38 | 0.01 | 0.01 mg/l |
| 12 May 2026, 11:17 | 0.0059 | 0.0059 mg/l |
| 30 Apr 2026, 12:18 | <0.004 | below 0.004 mg/l (not detected above this) |
| 27 Mar 2026, 13:00 | 0.011 | 0.011 mg/l |
| 10 Feb 2026, 13:11 | 0.079 | 0.079 mg/l |
| 27 Jan 2026, 12:05 | 0.055 | 0.055 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.01 mg/l
Sampled 17 Aug 2026, 52 days ago · 8 results banked
Every result (8)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Aug 2026, 11:28 | 0.01 | 0.01 mg/l |
| 17 Jul 2026, 14:15 | 0.0059 | 0.0059 mg/l |
| 4 Jun 2026, 10:38 | 0.0036 | 0.0036 mg/l |
| 12 May 2026, 11:17 | 0.0026 | 0.0026 mg/l |
| 30 Apr 2026, 12:18 | 0.002 | 0.002 mg/l |
| 27 Mar 2026, 13:00 | 0.0015 | 0.0015 mg/l |
| 10 Feb 2026, 13:11 | 0.0031 | 0.0031 mg/l |
| 27 Jan 2026, 12:05 | 0.0028 | 0.0028 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
47 µS/cm
Sampled 17 Aug 2026, 52 days ago · 8 results banked
Every result (8)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Aug 2026, 11:28 | 47 | 47 µS/cm |
| 17 Jul 2026, 14:15 | 46 | 46 µS/cm |
| 4 Jun 2026, 10:38 | 37 | 37 µS/cm |
| 12 May 2026, 11:17 | 45 | 45 µS/cm |
| 30 Apr 2026, 12:18 | 43 | 43 µS/cm |
| 27 Mar 2026, 13:00 | 44 | 44 µS/cm |
| 10 Feb 2026, 13:11 | 36 | 36 µS/cm |
| 27 Jan 2026, 12:05 | 31 | 31 µS/cm |
Everything measured here
19 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 19 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 8 | Jan 2026 – Aug 2026 | 104.8% 17 Aug 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 8 | Jan 2026 – Aug 2026 | 9.36 mg/l 17 Aug 2026 |
| Temperature of Water 0076 | River water | 8 | Jan 2026 – Aug 2026 | 20.8 °C 17 Aug 2026 |
| pH 0061 | River water | 8 | Jan 2026 – Aug 2026 | 6.67 17 Aug 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 8 | Jan 2026 – Aug 2026 | 0.0038 mg/l 17 Aug 2026 |
| Nitrate as N 0117 | River water | 8 | Jan 2026 – Aug 2026 | 0.027 mg/l 17 Aug 2026 |
| Orthophosphate, reactive as P 0180 | River water | 8 | Jan 2026 – Aug 2026 | 0.01 mg/l 17 Aug 2026 |
| Conductivity at 25 C 0077 | River water | 8 | Jan 2026 – Aug 2026 | 47 µS/cm 17 Aug 2026 |
| Alkalinity to pH 4.5 : Grans Plot 7610 | River water | 8 | Jan 2026 – Aug 2026 | 3.4 mg/l 17 Aug 2026 |
| Ammonia un-ionised as N 0119 | River water | 8 | Jan 2026 – Aug 2026 | below 0.00001 mg/l 17 Aug 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 8 | Jan 2026 – Aug 2026 | 1.5 mg/l 17 Aug 2026 |
| Flow Type 2896 | River water | 8 | Jan 2026 – Aug 2026 | Moderate Flow 17 Aug 2026 |
| GCMS Screen : Target Based multi-residue screening : Semi Quantitative 4994 | River water | 2 | Feb 2026 – May 2026 | 1 text result 12 May 2026 |
| LCMS Screen : Semi Quantitative 7299 | River water | 1 | Jun 2026 – Jun 2026 | 1 text result 4 Jun 2026 |
| Nitrite as N 0118 | River water | 8 | Jan 2026 – Aug 2026 | below 0.001 mg/l 17 Aug 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 8 | Jan 2026 – Aug 2026 | 0.028 mg/l 17 Aug 2026 |
| Phosphorus, Total as P 0348 | River water | 8 | Jan 2026 – Aug 2026 | 0.017 mg/l 17 Aug 2026 |
| Silica, reactive as SiO2 0182 | River water | 8 | Jan 2026 – Aug 2026 | 5.4 mg/l 17 Aug 2026 |
| Solids, Suspended at 105 C 0135 | River water | 8 | Jan 2026 – Aug 2026 | below 3 mg/l 17 Aug 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.