River Gannel at Gwills Gauging Station
EA name: RIVER GANNEL AT GWILLS GAUGING STATION
Environment Agency sampling point SW-82410249 · 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
- 11 Aug 2026, 09:2151 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 27 since 11 Sep 2024 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Planned investigation (local monitoring)
- Where
- National Grid 182857, 59297As published, to the nearest 1 m. Open in a map
- River, by its own name
- Gannel
- River, by the map
- River GannelPlaced on the river its name gives, 24 m from the line.
- Next gauge downstream
- None tracedIts water reaches the sea without passing a gauge.Beside Gwills, GWILLS: too close to say above or below.
- Why it was sampled
- Planned investigation (local monitoring) (22 samples)
Monitoring (national agency policy) (5 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
91%
Sampled 11 Aug 2026, 51 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Aug 2026, 09:21 | 91 | 91% |
| 20 Jul 2026, 09:08 | 95.2 | 95.2% |
| 16 Jun 2026, 10:00 | 96 | 96% |
| 11 May 2026, 09:21 | 97.6 | 97.6% |
| 1 Apr 2026, 09:48 | 98.3 | 98.3% |
| 9 Mar 2026, 09:44 | 97.5 | 97.5% |
| 4 Feb 2026, 09:51 | 98 | 98% |
| 7 Jan 2026, 11:35 | 99.5 | 99.5% |
| 10 Dec 2025, 12:51 | 95.1 | 95.1% |
| 11 Nov 2025, 13:00 | 96.1 | 96.1% |
| 8 Oct 2025, 11:39 | 96.7 | 96.7% |
| 24 Sep 2025, 09:41 | 96.3 | 96.3% |
| 29 Aug 2025, 13:39 | 96.9 | 96.9% |
| 25 Jul 2025, 09:25 | 97 | 97% |
| 30 Jun 2025, 10:45 | 95.5 | 95.5% |
| 13 Jun 2025, 09:14 | 95.3 | 95.3% |
| 30 May 2025, 10:35 | 100.2 | 100.2% |
| 2 May 2025, 09:25 | 96.5 | 96.5% |
| 1 May 2025, 09:50 | 100.1 | 100.1% |
| 16 Apr 2025, 08:21 | 98 | 98% |
| 31 Mar 2025, 09:34 | 102.7 | 102.7% |
| 12 Feb 2025, 09:49 | 98.6 | 98.6% |
| 15 Jan 2025, 09:20 | 97.4 | 97.4% |
| 17 Dec 2024, 09:18 | 95.9 | 95.9% |
| 13 Nov 2024, 09:18 | 95.3 | 95.3% |
| 16 Oct 2024, 09:09 | 94.8 | 94.8% |
| 11 Sep 2024, 09:09 | 95.6 | 95.6% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.27 mg/l
Sampled 11 Aug 2026, 51 days ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Aug 2026, 09:21 | 9.27 | 9.27 mg/l |
| 20 Jul 2026, 09:08 | 9.47 | 9.47 mg/l |
| 16 Jun 2026, 10:00 | 9.8 | 9.8 mg/l |
| 11 May 2026, 09:21 | 10.8 | 10.8 mg/l |
| 1 Apr 2026, 09:48 | 11 | 11 mg/l |
| 9 Mar 2026, 09:44 | 10.8 | 10.8 mg/l |
| 4 Feb 2026, 09:51 | 11.3 | 11.3 mg/l |
| 7 Jan 2026, 11:35 | 11.7 | 11.7 mg/l |
| 10 Dec 2025, 12:51 | 10.3 | 10.3 mg/l |
| 11 Nov 2025, 13:00 | 10.1 | 10.1 mg/l |
| 8 Oct 2025, 11:39 | 10.3 | 10.3 mg/l |
| 24 Sep 2025, 09:41 | 11 | 11 mg/l |
| 29 Aug 2025, 13:39 | 9.58 | 9.58 mg/l |
| 25 Jul 2025, 09:25 | 9.76 | 9.76 mg/l |
| 13 Jun 2025, 09:14 | 9.73 | 9.73 mg/l |
| 2 May 2025, 09:25 | 10.1 | 10.1 mg/l |
| 16 Apr 2025, 08:21 | 11.5 | 11.5 mg/l |
Water temperature
code 0076 · °C
14.4 °C
Sampled 11 Aug 2026, 51 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Aug 2026, 09:21 | 14.4 | 14.4 °C |
| 20 Jul 2026, 09:08 | 15.5 | 15.5 °C |
| 16 Jun 2026, 10:00 | 14.3 | 14.3 °C |
| 11 May 2026, 09:21 | 10.6 | 10.6 °C |
| 1 Apr 2026, 09:48 | 10.4 | 10.4 °C |
| 9 Mar 2026, 09:44 | 10.7 | 10.7 °C |
| 4 Feb 2026, 09:51 | 9.2 | 9.2 °C |
| 7 Jan 2026, 11:35 | 8.2 | 8.2 °C |
| 10 Dec 2025, 12:51 | 11.6 | 11.6 °C |
| 11 Nov 2025, 13:00 | 12.9 | 12.9 °C |
| 8 Oct 2025, 11:39 | 12.4 | 12.4 °C |
| 24 Sep 2025, 09:41 | 9.4 | 9.4 °C |
| 29 Aug 2025, 13:39 | 15.8 | 15.8 °C |
| 25 Jul 2025, 09:25 | 15 | 15 °C |
| 30 Jun 2025, 10:45 | 15.5 | 15.5 °C |
| 13 Jun 2025, 09:14 | 14.3 | 14.3 °C |
| 30 May 2025, 10:35 | 14.9 | 14.9 °C |
| 2 May 2025, 09:25 | 13.2 | 13.2 °C |
| 1 May 2025, 09:50 | 12.1 | 12.1 °C |
| 16 Apr 2025, 08:21 | 8.2 | 8.2 °C |
| 31 Mar 2025, 09:34 | 8.2 | 8.2 °C |
| 12 Feb 2025, 09:49 | 7.2 | 7.2 °C |
| 15 Jan 2025, 09:20 | 8.2 | 8.2 °C |
| 17 Dec 2024, 09:18 | 10.7 | 10.7 °C |
| 13 Nov 2024, 09:18 | 9.4 | 9.4 °C |
| 16 Oct 2024, 09:09 | 14.1 | 14.1 °C |
| 11 Sep 2024, 09:09 | 12.9 | 12.9 °C |
pH
code 0061
7.55
Sampled 11 Aug 2026, 51 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Aug 2026, 09:21 | 7.55 | 7.55 |
| 20 Jul 2026, 09:08 | 7.6 | 7.6 |
| 16 Jun 2026, 10:00 | 7.68 | 7.68 |
| 11 May 2026, 09:21 | 7.64 | 7.64 |
| 1 Apr 2026, 09:48 | 7.68 | 7.68 |
| 9 Mar 2026, 09:44 | 7.49 | 7.49 |
| 4 Feb 2026, 09:51 | 7.41 | 7.41 |
| 7 Jan 2026, 11:35 | 7.62 | 7.62 |
| 10 Dec 2025, 12:51 | 7.29 | 7.29 |
| 11 Nov 2025, 13:00 | 7.56 | 7.56 |
| 8 Oct 2025, 11:39 | 7.83 | 7.83 |
| 24 Sep 2025, 09:41 | 7.74 | 7.74 |
| 29 Aug 2025, 13:39 | 7.52 | 7.52 |
| 25 Jul 2025, 09:25 | 7.48 | 7.48 |
| 30 Jun 2025, 10:45 | 7.8 | 7.8 |
| 13 Jun 2025, 09:14 | 7.71 | 7.71 |
| 30 May 2025, 10:35 | 7.44 | 7.44 |
| 2 May 2025, 09:25 | 7.68 | 7.68 |
| 1 May 2025, 09:50 | 7.8 | 7.8 |
| 16 Apr 2025, 08:21 | 7.24 | 7.24 |
| 31 Mar 2025, 09:34 | 7.6 | 7.6 |
| 12 Feb 2025, 09:49 | 7.6 | 7.6 |
| 15 Jan 2025, 09:20 | 7.5 | 7.5 |
| 17 Dec 2024, 09:18 | 7.6 | 7.6 |
| 13 Nov 2024, 09:18 | 7.7 | 7.7 |
| 16 Oct 2024, 09:09 | 7.6 | 7.6 |
| 11 Sep 2024, 09:09 | 7.7 | 7.7 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.085 mg/l
Sampled 11 Aug 2026, 51 days ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Aug 2026, 09:21 | 0.085 | 0.085 mg/l |
| 20 Jul 2026, 09:08 | 0.14 | 0.14 mg/l |
| 16 Jun 2026, 10:00 | 0.062 | 0.062 mg/l |
| 11 May 2026, 09:21 | 0.085 | 0.085 mg/l |
| 1 Apr 2026, 09:48 | 0.043 | 0.043 mg/l |
| 9 Mar 2026, 09:44 | 0.14 | 0.14 mg/l |
| 4 Feb 2026, 09:51 | 0.072 | 0.072 mg/l |
| 7 Jan 2026, 11:35 | 0.07 | 0.07 mg/l |
| 10 Dec 2025, 12:51 | 0.055 | 0.055 mg/l |
| 11 Nov 2025, 13:00 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Oct 2025, 11:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Sep 2025, 09:41 | 0.047 | 0.047 mg/l |
| 29 Aug 2025, 13:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 25 Jul 2025, 09:25 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Jun 2025, 09:14 | 0.054 | 0.054 mg/l |
| 2 May 2025, 09:25 | 0.038 | 0.038 mg/l |
| 16 Apr 2025, 08:21 | 0.22 | 0.22 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
4.3 mg/l
Sampled 11 Aug 2026, 51 days ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Aug 2026, 09:21 | 4.3 | 4.3 mg/l |
| 20 Jul 2026, 09:08 | 4.7 | 4.7 mg/l |
| 16 Jun 2026, 10:00 | 4.39 | 4.39 mg/l |
| 11 May 2026, 09:21 | 4.89 | 4.89 mg/l |
| 1 Apr 2026, 09:48 | 5.87 | 5.87 mg/l |
| 9 Mar 2026, 09:44 | 5.66 | 5.66 mg/l |
| 4 Feb 2026, 09:51 | 6.29 | 6.29 mg/l |
| 7 Jan 2026, 11:35 | 5.08 | 5.08 mg/l |
| 10 Dec 2025, 12:51 | 6.49 | 6.49 mg/l |
| 11 Nov 2025, 13:00 | 4.49 | 4.49 mg/l |
| 8 Oct 2025, 11:39 | 3.99 | 3.99 mg/l |
| 24 Sep 2025, 09:41 | 4.09 | 4.09 mg/l |
| 29 Aug 2025, 13:39 | 3.29 | 3.29 mg/l |
| 25 Jul 2025, 09:25 | 4.9 | 4.9 mg/l |
| 13 Jun 2025, 09:14 | 3.89 | 3.89 mg/l |
| 2 May 2025, 09:25 | 5.38 | 5.38 mg/l |
| 16 Apr 2025, 08:21 | 2.79 | 2.79 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.047 mg/l
Sampled 11 Aug 2026, 51 days ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Aug 2026, 09:21 | 0.047 | 0.047 mg/l |
| 20 Jul 2026, 09:08 | 0.047 | 0.047 mg/l |
| 16 Jun 2026, 10:00 | 0.036 | 0.036 mg/l |
| 11 May 2026, 09:21 | 0.032 | 0.032 mg/l |
| 1 Apr 2026, 09:48 | 0.013 | 0.013 mg/l |
| 9 Mar 2026, 09:44 | 0.033 | 0.033 mg/l |
| 4 Feb 2026, 09:51 | 0.03 | 0.03 mg/l |
| 7 Jan 2026, 11:35 | 0.028 | 0.028 mg/l |
| 10 Dec 2025, 12:51 | 0.028 | 0.028 mg/l |
| 11 Nov 2025, 13:00 | 0.02 | 0.02 mg/l |
| 8 Oct 2025, 11:39 | 0.02 | 0.02 mg/l |
| 24 Sep 2025, 09:41 | 0.027 | 0.027 mg/l |
| 29 Aug 2025, 13:39 | 0.092 | 0.092 mg/l |
| 25 Jul 2025, 09:25 | 0.036 | 0.036 mg/l |
| 13 Jun 2025, 09:14 | 0.044 | 0.044 mg/l |
| 2 May 2025, 09:25 | 0.023 | 0.023 mg/l |
| 16 Apr 2025, 08:21 | 0.049 | 0.049 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
352 µS/cm
Sampled 11 Aug 2026, 51 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Aug 2026, 09:21 | 352 | 352 µS/cm |
| 20 Jul 2026, 09:08 | 357 | 357 µS/cm |
| 16 Jun 2026, 10:00 | 324 | 324 µS/cm |
| 11 May 2026, 09:21 | 321 | 321 µS/cm |
| 1 Apr 2026, 09:48 | 315 | 315 µS/cm |
| 9 Mar 2026, 09:44 | 307 | 307 µS/cm |
| 4 Feb 2026, 09:51 | 310 | 310 µS/cm |
| 7 Jan 2026, 11:35 | 321 | 321 µS/cm |
| 10 Dec 2025, 12:51 | 306 | 306 µS/cm |
| 11 Nov 2025, 13:00 | 311 | 311 µS/cm |
| 8 Oct 2025, 11:39 | 328 | 328 µS/cm |
| 24 Sep 2025, 09:41 | 335 | 335 µS/cm |
| 29 Aug 2025, 13:39 | 308 | 308 µS/cm |
| 25 Jul 2025, 09:25 | 347 | 347 µS/cm |
| 30 Jun 2025, 10:45 | 325 | 325 µS/cm |
| 13 Jun 2025, 09:14 | 313 | 313 µS/cm |
| 30 May 2025, 10:35 | 325 | 325 µS/cm |
| 2 May 2025, 09:25 | 320 | 320 µS/cm |
| 1 May 2025, 09:50 | 313 | 313 µS/cm |
| 16 Apr 2025, 08:21 | 246 | 246 µS/cm |
| 31 Mar 2025, 09:34 | 324 | 324 µS/cm |
| 12 Feb 2025, 09:49 | 328 | 328 µS/cm |
| 15 Jan 2025, 09:20 | 318 | 318 µS/cm |
| 17 Dec 2024, 09:18 | 320 | 320 µS/cm |
| 13 Nov 2024, 09:18 | 322 | 322 µS/cm |
| 16 Oct 2024, 09:09 | 250 | 250 µS/cm |
| 11 Sep 2024, 09:09 | 328 | 328 µS/cm |
Everything measured here
37 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 37 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 27 | Sep 2024 – Aug 2026 | 91% 11 Aug 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 17 | Apr 2025 – Aug 2026 | 9.27 mg/l 11 Aug 2026 |
| Temperature of Water 0076 | River water | 27 | Sep 2024 – Aug 2026 | 14.4 °C 11 Aug 2026 |
| pH 0061 | River water | 27 | Sep 2024 – Aug 2026 | 7.55 11 Aug 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 17 | Apr 2025 – Aug 2026 | 0.085 mg/l 11 Aug 2026 |
| Nitrate as N 0117 | River water | 17 | Apr 2025 – Aug 2026 | 4.3 mg/l 11 Aug 2026 |
| Orthophosphate, reactive as P 0180 | River water | 17 | Apr 2025 – Aug 2026 | 0.047 mg/l 11 Aug 2026 |
| Conductivity at 25 C 0077 | River water | 27 | Sep 2024 – Aug 2026 | 352 µS/cm 11 Aug 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 17 | Apr 2025 – Aug 2026 | 57 mg/l 11 Aug 2026 |
| Ammonia un-ionised as N 0119 | River water | 17 | Apr 2025 – Aug 2026 | 0.00077 mg/l 11 Aug 2026 |
| Barium, Dissolved 9446 | River water | 10 | Sep 2024 – Jun 2025 | below 10 µg/l 30 Jun 2025 |
| Boron, Dissolved 9447 | River water | 10 | Sep 2024 – Jun 2025 | below 100 µg/l 30 Jun 2025 |
| Cadmium 0108 | River water | 10 | Sep 2024 – Jun 2025 | 0.14 µg/l 30 Jun 2025 |
| Cadmium, Dissolved 0106 | River water | 10 | Sep 2024 – Jun 2025 | 0.11 µg/l 30 Jun 2025 |
| Calcium, Dissolved 0239 | River water | 10 | Sep 2024 – Jun 2025 | 25 mg/l 30 Jun 2025 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 10 | Sep 2024 – Jun 2025 | 1.7 mg/l 30 Jun 2025 |
| Copper 6452 | River water | 10 | Sep 2024 – Jun 2025 | 1.8 µg/l 30 Jun 2025 |
| Copper, Dissolved 6450 | River water | 10 | Sep 2024 – Jun 2025 | 1.5 µg/l 30 Jun 2025 |
| Hardness, Total as CaCO3 0158 | River water | 10 | Sep 2024 – Jun 2025 | 99.1 mg/l 30 Jun 2025 |
| Iron, Dissolved 6460 | River water | 10 | Sep 2024 – Jun 2025 | 120 µg/l 30 Jun 2025 |
| Lead 0050 | River water | 10 | Sep 2024 – Jun 2025 | 4.7 µg/l 30 Jun 2025 |
| Lead, Dissolved 0052 | River water | 10 | Sep 2024 – Jun 2025 | 2 µg/l 30 Jun 2025 |
| Lithium, Dissolved 4201 | River water | 10 | Sep 2024 – Jun 2025 | below 100 µg/l 30 Jun 2025 |
| Magnesium, Dissolved 0235 | River water | 10 | Sep 2024 – Jun 2025 | 8.9 mg/l 30 Jun 2025 |
| Manganese, Dissolved 6458 | River water | 10 | Sep 2024 – Jun 2025 | 29 µg/l 30 Jun 2025 |
| Nickel 6462 | River water | 10 | Sep 2024 – Jun 2025 | 4.2 µg/l 30 Jun 2025 |
| Nickel, Dissolved 3410 | River water | 10 | Sep 2024 – Jun 2025 | 3.9 µg/l 30 Jun 2025 |
| Nitrite as N 0118 | River water | 17 | Apr 2025 – Aug 2026 | 0.0041 mg/l 11 Aug 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 17 | Apr 2025 – Aug 2026 | 4.3 mg/l 11 Aug 2026 |
| pH : In Situ 3169 | River water | 4 | Dec 2024 – Mar 2025 | 7.73 31 Mar 2025 |
| Potassium, Dissolved 0209 | River water | 10 | Sep 2024 – Jun 2025 | 3 mg/l 30 Jun 2025 |
| Sodium, Dissolved 0205 | River water | 10 | Sep 2024 – Jun 2025 | 21 mg/l 30 Jun 2025 |
| Solids, Suspended at 105 C 0135 | River water | 10 | Sep 2024 – Jun 2025 | below 3 mg/l 30 Jun 2025 |
| Strontium, Filtered 6693 | River water | 10 | Sep 2024 – Jun 2025 | 120 µg/l 30 Jun 2025 |
| Sulphate, Dissolved as SO4 7859 | River water | 10 | Sep 2024 – Jun 2025 | 25 mg/l 30 Jun 2025 |
| Zinc 6455 | River water | 10 | Sep 2024 – Jun 2025 | 53 µg/l 30 Jun 2025 |
| Zinc, Dissolved 3408 | River water | 10 | Sep 2024 – Jun 2025 | 47 µg/l 30 Jun 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.