G.U.C. at Coppermill Lane, Harefield
EA name: G.U.C. AT COPPERMILL LANE, HAREFIELD
Environment Agency sampling point TH-PCNR0186 · 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
- 4 Sep 2026, 09:1027 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 34 since 23 Oct 2023 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 504070, 191110As published, to the nearest 10 m. Open in a map
- River, by its own name
- G U C
- River, by the map
- Not placedTwo watercourses within reach (30 m and 77 m) and no name to choose by. The river map cannot say which watercourse this is.
- Next gauge downstream
- Not known
- Why it was sampled
- Planned investigation (local monitoring) (26 samples)
Monitoring (national agency policy) (6 samples)
Environmental monitoring statutory (EU directives) (2 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
78.5%
Sampled 4 Sep 2026, 27 days ago · 34 results banked
Every result (34)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 09:10 | 78.5 | 78.5% |
| 12 Aug 2026, 10:01 | 69.3 | 69.3% |
| 20 Jul 2026, 11:19 | 85 | 85% |
| 16 Jun 2026, 11:17 | 88.4 | 88.4% |
| 28 May 2026, 12:09 | 95.2 | 95.2% |
| 1 Apr 2026, 12:59 | 94.5 | 94.5% |
| 5 Mar 2026, 13:34 | 94.5 | 94.5% |
| 3 Feb 2026, 12:10 | 91.6 | 91.6% |
| 5 Jan 2026, 13:55 | 96.9 | 96.9% |
| 2 Dec 2025, 10:14 | 87.8 | 87.8% |
| 10 Nov 2025, 11:48 | 88.9 | 88.9% |
| 17 Oct 2025, 08:56 | 85 | 85% |
| 1 Sep 2025, 11:33 | 85.4 | 85.4% |
| 21 Aug 2025, 13:57 | 86.1 | 86.1% |
| 31 Jul 2025, 09:16 | 82.7 | 82.7% |
| 11 Jun 2025, 13:00 | 82.4 | 82.4% |
| 23 May 2025, 14:36 | 108.4 | 108.4% |
| 2 Apr 2025, 10:16 | 94.5 | 94.5% |
| 18 Mar 2025, 10:08 | 96.4 | 96.4% |
| 4 Feb 2025, 12:26 | 95.8 | 95.8% |
| 15 Jan 2025, 14:49 | 93.1 | 93.1% |
| 11 Dec 2024, 09:42 | 93.6 | 93.6% |
| 11 Nov 2024, 09:12 | 90.6 | 90.6% |
| 9 Oct 2024, 09:22 | 92.4 | 92.4% |
| 2 Sep 2024, 11:18 | 89.7 | 89.7% |
| 9 Aug 2024, 08:38 | 84.4 | 84.4% |
| 2 Jul 2024, 10:32 | 91.1 | 91.1% |
| 6 Jun 2024, 11:09 | 98.5 | 98.5% |
| 1 Mar 2024, 10:02 | 93.1 | 93.1% |
| 5 Feb 2024, 12:25 | 96.6 | 96.6% |
| 9 Jan 2024, 12:55 | 91.8 | 91.8% |
| 4 Dec 2023, 11:51 | 89.4 | 89.4% |
| 13 Nov 2023, 12:16 | 86.3 | 86.3% |
| 23 Oct 2023, 13:36 | 87.7 | 87.7% |
Dissolved oxygen
as O2 · code 9924 · mg/l
7.19 mg/l
Sampled 4 Sep 2026, 27 days ago · 34 results banked
Every result (34)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 09:10 | 7.19 | 7.19 mg/l |
| 12 Aug 2026, 10:01 | 6.29 | 6.29 mg/l |
| 20 Jul 2026, 11:19 | 7.71 | 7.71 mg/l |
| 16 Jun 2026, 11:17 | 8.35 | 8.35 mg/l |
| 28 May 2026, 12:09 | 8.72 | 8.72 mg/l |
| 1 Apr 2026, 12:59 | 10.1 | 10.1 mg/l |
| 5 Mar 2026, 13:34 | 10.1 | 10.1 mg/l |
| 3 Feb 2026, 12:10 | 10.8 | 10.8 mg/l |
| 5 Jan 2026, 13:55 | 12 | 12 mg/l |
| 2 Dec 2025, 10:14 | 9.78 | 9.78 mg/l |
| 10 Nov 2025, 11:48 | 9.1 | 9.1 mg/l |
| 17 Oct 2025, 08:56 | 8.64 | 8.64 mg/l |
| 1 Sep 2025, 11:33 | 8.15 | 8.15 mg/l |
| 21 Aug 2025, 13:57 | 8.15 | 8.15 mg/l |
| 31 Jul 2025, 09:16 | 7.86 | 7.86 mg/l |
| 11 Jun 2025, 13:00 | 7.99 | 7.99 mg/l |
| 23 May 2025, 14:36 | 10.5 | 10.5 mg/l |
| 2 Apr 2025, 10:16 | 10.2 | 10.2 mg/l |
| 18 Mar 2025, 10:08 | 11.3 | 11.3 mg/l |
| 4 Feb 2025, 12:26 | 11.2 | 11.2 mg/l |
| 15 Jan 2025, 14:49 | 10.7 | 10.7 mg/l |
| 11 Dec 2024, 09:42 | 10.9 | 10.9 mg/l |
| 11 Nov 2024, 09:12 | 9.76 | 9.76 mg/l |
| 9 Oct 2024, 09:22 | 9.37 | 9.37 mg/l |
| 2 Sep 2024, 11:18 | 8.47 | 8.47 mg/l |
| 9 Aug 2024, 08:38 | 8.07 | 8.07 mg/l |
| 2 Jul 2024, 10:32 | 8.95 | 8.95 mg/l |
| 6 Jun 2024, 11:09 | 9.91 | 9.91 mg/l |
| 1 Mar 2024, 10:02 | 10.7 | 10.7 mg/l |
| 5 Feb 2024, 12:25 | 10.7 | 10.7 mg/l |
| 9 Jan 2024, 12:55 | 11.1 | 11.1 mg/l |
| 4 Dec 2023, 11:51 | 10.1 | 10.1 mg/l |
| 13 Nov 2023, 12:16 | 9.22 | 9.22 mg/l |
| 23 Oct 2023, 13:36 | 8.98 | 8.98 mg/l |
Water temperature
code 0076 · °C
19.5 °C
Sampled 4 Sep 2026, 27 days ago · 34 results banked
Every result (34)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 09:10 | 19.5 | 19.5 °C |
| 12 Aug 2026, 10:01 | 20 | 20 °C |
| 20 Jul 2026, 11:19 | 20 | 20 °C |
| 16 Jun 2026, 11:17 | 18 | 18 °C |
| 28 May 2026, 12:09 | 19.5 | 19.5 °C |
| 1 Apr 2026, 12:59 | 12.1 | 12.1 °C |
| 5 Mar 2026, 13:34 | 12.1 | 12.1 °C |
| 3 Feb 2026, 12:10 | 8.2 | 8.2 °C |
| 5 Jan 2026, 13:55 | 6 | 6 °C |
| 2 Dec 2025, 10:14 | 10.5 | 10.5 °C |
| 10 Nov 2025, 11:48 | 14.2 | 14.2 °C |
| 17 Oct 2025, 08:56 | 14.5 | 14.5 °C |
| 1 Sep 2025, 11:33 | 17.5 | 17.5 °C |
| 21 Aug 2025, 13:57 | 17.9 | 17.9 °C |
| 31 Jul 2025, 09:16 | 17.7 | 17.7 °C |
| 11 Jun 2025, 13:00 | 16.7 | 16.7 °C |
| 23 May 2025, 14:36 | 16.9 | 16.9 °C |
| 2 Apr 2025, 10:16 | 11.7 | 11.7 °C |
| 18 Mar 2025, 10:08 | 8.5 | 8.5 °C |
| 4 Feb 2025, 12:26 | 8.6 | 8.6 °C |
| 15 Jan 2025, 14:49 | 9.2 | 9.2 °C |
| 11 Dec 2024, 09:42 | 8.7 | 8.7 °C |
| 11 Nov 2024, 09:12 | 11.9 | 11.9 °C |
| 9 Oct 2024, 09:22 | 14.6 | 14.6 °C |
| 2 Sep 2024, 11:18 | 18 | 18 °C |
| 9 Aug 2024, 08:38 | 17.4 | 17.4 °C |
| 2 Jul 2024, 10:32 | 16.1 | 16.1 °C |
| 6 Jun 2024, 11:09 | 15 | 15 °C |
| 1 Mar 2024, 10:02 | 9 | 9 °C |
| 5 Feb 2024, 12:25 | 10.8 | 10.8 °C |
| 9 Jan 2024, 12:55 | 7.2 | 7.2 °C |
| 4 Dec 2023, 11:51 | 10 | 10 °C |
| 13 Nov 2023, 12:16 | 12.3 | 12.3 °C |
| 23 Oct 2023, 13:36 | 14.2 | 14.2 °C |
pH
code 0061
7.41
Sampled 4 Sep 2026, 27 days ago · 34 results banked
Every result (34)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 09:10 | 7.41 | 7.41 |
| 12 Aug 2026, 10:01 | 7.27 | 7.27 |
| 20 Jul 2026, 11:19 | 7.33 | 7.33 |
| 16 Jun 2026, 11:17 | 7.45 | 7.45 |
| 28 May 2026, 12:09 | 7.67 | 7.67 |
| 1 Apr 2026, 12:59 | 7.65 | 7.65 |
| 5 Mar 2026, 13:34 | 7.83 | 7.83 |
| 3 Feb 2026, 12:10 | 8.27 | 8.27 |
| 5 Jan 2026, 13:55 | 7.61 | 7.61 |
| 2 Dec 2025, 10:14 | 7.66 | 7.66 |
| 10 Nov 2025, 11:48 | 7.53 | 7.53 |
| 17 Oct 2025, 08:56 | 7.42 | 7.42 |
| 1 Sep 2025, 11:33 | 7.61 | 7.61 |
| 21 Aug 2025, 13:57 | 7.51 | 7.51 |
| 31 Jul 2025, 09:16 | 7.54 | 7.54 |
| 11 Jun 2025, 13:00 | 8.14 | 8.14 |
| 23 May 2025, 14:36 | 8.32 | 8.32 |
| 2 Apr 2025, 10:16 | 7.74 | 7.74 |
| 18 Mar 2025, 10:08 | 7.77 | 7.77 |
| 4 Feb 2025, 12:26 | 7.72 | 7.72 |
| 15 Jan 2025, 14:49 | 7.46 | 7.46 |
| 11 Dec 2024, 09:42 | 7.67 | 7.67 |
| 11 Nov 2024, 09:12 | 7.61 | 7.61 |
| 9 Oct 2024, 09:22 | 7.52 | 7.52 |
| 2 Sep 2024, 11:18 | 7.75 | 7.75 |
| 9 Aug 2024, 08:38 | 7.6 | 7.6 |
| 2 Jul 2024, 10:32 | 7.65 | 7.65 |
| 6 Jun 2024, 11:09 | 7.71 | 7.71 |
| 1 Mar 2024, 10:02 | 7.68 | 7.68 |
| 5 Feb 2024, 12:25 | 7.6 | 7.6 |
| 9 Jan 2024, 12:55 | 7.61 | 7.61 |
| 4 Dec 2023, 11:51 | 7.48 | 7.48 |
| 13 Nov 2023, 12:16 | 7.41 | 7.41 |
| 23 Oct 2023, 13:36 | 7.53 | 7.53 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.16 mg/l
Sampled 4 Sep 2026, 27 days ago · 34 results banked
Every result (34)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 09:10 | 0.16 | 0.16 mg/l |
| 12 Aug 2026, 10:01 | 0.24 | 0.24 mg/l |
| 20 Jul 2026, 11:19 | 0.17 | 0.17 mg/l |
| 16 Jun 2026, 11:17 | 0.088 | 0.088 mg/l |
| 28 May 2026, 12:09 | 0.12 | 0.12 mg/l |
| 1 Apr 2026, 12:59 | 0.072 | 0.072 mg/l |
| 5 Mar 2026, 13:34 | 0.067 | 0.067 mg/l |
| 3 Feb 2026, 12:10 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Jan 2026, 13:55 | 0.12 | 0.12 mg/l |
| 2 Dec 2025, 10:14 | 0.068 | 0.068 mg/l |
| 10 Nov 2025, 11:48 | 0.13 | 0.13 mg/l |
| 17 Oct 2025, 08:56 | 0.091 | 0.091 mg/l |
| 1 Sep 2025, 11:33 | 0.058 | 0.058 mg/l |
| 21 Aug 2025, 13:57 | 0.073 | 0.073 mg/l |
| 31 Jul 2025, 09:16 | 0.085 | 0.085 mg/l |
| 11 Jun 2025, 13:00 | 0.056 | 0.056 mg/l |
| 23 May 2025, 14:36 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Apr 2025, 10:16 | 0.041 | 0.041 mg/l |
| 18 Mar 2025, 10:08 | 0.041 | 0.041 mg/l |
| 4 Feb 2025, 12:26 | 0.062 | 0.062 mg/l |
| 15 Jan 2025, 14:49 | 0.42 | 0.42 mg/l |
| 11 Dec 2024, 09:42 | 0.035 | 0.035 mg/l |
| 11 Nov 2024, 09:12 | 0.04 | 0.04 mg/l |
| 9 Oct 2024, 09:22 | 0.058 | 0.058 mg/l |
| 2 Sep 2024, 11:18 | 0.055 | 0.055 mg/l |
| 9 Aug 2024, 08:38 | 0.077 | 0.077 mg/l |
| 2 Jul 2024, 10:32 | 0.07 | 0.07 mg/l |
| 6 Jun 2024, 11:09 | 0.057 | 0.057 mg/l |
| 1 Mar 2024, 10:02 | 0.043 | 0.043 mg/l |
| 5 Feb 2024, 12:25 | 0.032 | 0.032 mg/l |
| 9 Jan 2024, 12:55 | 0.043 | 0.043 mg/l |
| 4 Dec 2023, 11:51 | 0.045 | 0.045 mg/l |
| 13 Nov 2023, 12:16 | 1.1 | 1.1 mg/l |
| 23 Oct 2023, 13:36 | 0.054 | 0.054 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
17 mg/l
Sampled 4 Sep 2026, 27 days ago · 34 results banked
Every result (34)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 09:10 | 17 | 17 mg/l |
| 12 Aug 2026, 10:01 | 23.9 | 23.9 mg/l |
| 20 Jul 2026, 11:19 | 17.9 | 17.9 mg/l |
| 16 Jun 2026, 11:17 | 15 | 15 mg/l |
| 28 May 2026, 12:09 | 12 | 12 mg/l |
| 1 Apr 2026, 12:59 | 9.47 | 9.47 mg/l |
| 5 Mar 2026, 13:34 | 9.28 | 9.28 mg/l |
| 3 Feb 2026, 12:10 | 5.39 | 5.39 mg/l |
| 5 Jan 2026, 13:55 | 13.9 | 13.9 mg/l |
| 2 Dec 2025, 10:14 | 12 | 12 mg/l |
| 10 Nov 2025, 11:48 | 13 | 13 mg/l |
| 17 Oct 2025, 08:56 | 18 | 18 mg/l |
| 1 Sep 2025, 11:33 | 12 | 12 mg/l |
| 21 Aug 2025, 13:57 | 18 | 18 mg/l |
| 31 Jul 2025, 09:16 | 16 | 16 mg/l |
| 11 Jun 2025, 13:00 | 11 | 11 mg/l |
| 23 May 2025, 14:36 | 5.48 | 5.48 mg/l |
| 2 Apr 2025, 10:16 | 8.98 | 8.98 mg/l |
| 18 Mar 2025, 10:08 | 9.58 | 9.58 mg/l |
| 4 Feb 2025, 12:26 | 8.97 | 8.97 mg/l |
| 15 Jan 2025, 14:49 | 9.11 | 9.11 mg/l |
| 11 Dec 2024, 09:42 | 8.08 | 8.08 mg/l |
| 11 Nov 2024, 09:12 | 12 | 12 mg/l |
| 9 Oct 2024, 09:22 | 7.87 | 7.87 mg/l |
| 2 Sep 2024, 11:18 | 9.58 | 9.58 mg/l |
| 9 Aug 2024, 08:38 | 12 | 12 mg/l |
| 2 Jul 2024, 10:32 | 8.27 | 8.27 mg/l |
| 6 Jun 2024, 11:09 | 7.98 | 7.98 mg/l |
| 1 Mar 2024, 10:02 | 7.57 | 7.57 mg/l |
| 5 Feb 2024, 12:25 | 7.67 | 7.67 mg/l |
| 9 Jan 2024, 12:55 | 7.87 | 7.87 mg/l |
| 4 Dec 2023, 11:51 | 12 | 12 mg/l |
| 13 Nov 2023, 12:16 | 9.13 | 9.13 mg/l |
| 23 Oct 2023, 13:36 | 12 | 12 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.4 mg/l
Sampled 4 Sep 2026, 27 days ago · 34 results banked
Every result (34)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 09:10 | 0.4 | 0.4 mg/l |
| 12 Aug 2026, 10:01 | 0.54 | 0.54 mg/l |
| 20 Jul 2026, 11:19 | 0.62 | 0.62 mg/l |
| 16 Jun 2026, 11:17 | 0.29 | 0.29 mg/l |
| 28 May 2026, 12:09 | 0.17 | 0.17 mg/l |
| 1 Apr 2026, 12:59 | 0.083 | 0.083 mg/l |
| 5 Mar 2026, 13:34 | 0.23 | 0.23 mg/l |
| 3 Feb 2026, 12:10 | 0.086 | 0.086 mg/l |
| 5 Jan 2026, 13:55 | 0.3 | 0.3 mg/l |
| 2 Dec 2025, 10:14 | 0.2 | 0.2 mg/l |
| 10 Nov 2025, 11:48 | 0.35 | 0.35 mg/l |
| 17 Oct 2025, 08:56 | 0.39 | 0.39 mg/l |
| 1 Sep 2025, 11:33 | 0.25 | 0.25 mg/l |
| 21 Aug 2025, 13:57 | 0.44 | 0.44 mg/l |
| 31 Jul 2025, 09:16 | 0.35 | 0.35 mg/l |
| 11 Jun 2025, 13:00 | 0.16 | 0.16 mg/l |
| 23 May 2025, 14:36 | 0.091 | 0.091 mg/l |
| 2 Apr 2025, 10:16 | 0.048 | 0.048 mg/l |
| 18 Mar 2025, 10:08 | 0.059 | 0.059 mg/l |
| 4 Feb 2025, 12:26 | 0.16 | 0.16 mg/l |
| 15 Jan 2025, 14:49 | 0.31 | 0.31 mg/l |
| 11 Dec 2024, 09:42 | 0.23 | 0.23 mg/l |
| 11 Nov 2024, 09:12 | 0.31 | 0.31 mg/l |
| 9 Oct 2024, 09:22 | 0.33 | 0.33 mg/l |
| 2 Sep 2024, 11:18 | 0.35 | 0.35 mg/l |
| 9 Aug 2024, 08:38 | 0.39 | 0.39 mg/l |
| 2 Jul 2024, 10:32 | 0.091 | 0.091 mg/l |
| 6 Jun 2024, 11:09 | 0.3 | 0.3 mg/l |
| 1 Mar 2024, 10:02 | 0.17 | 0.17 mg/l |
| 5 Feb 2024, 12:25 | 0.23 | 0.23 mg/l |
| 9 Jan 2024, 12:55 | 0.2 | 0.2 mg/l |
| 4 Dec 2023, 11:51 | 0.37 | 0.37 mg/l |
| 13 Nov 2023, 12:16 | 0.44 | 0.44 mg/l |
| 23 Oct 2023, 13:36 | 0.27 | 0.27 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
997 µS/cm
Sampled 4 Sep 2026, 27 days ago · 34 results banked
Every result (34)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 09:10 | 997 | 997 µS/cm |
| 12 Aug 2026, 10:01 | 1099 | 1099 µS/cm |
| 20 Jul 2026, 11:19 | 1046 | 1046 µS/cm |
| 16 Jun 2026, 11:17 | 865 | 865 µS/cm |
| 28 May 2026, 12:09 | 835 | 835 µS/cm |
| 1 Apr 2026, 12:59 | 821 | 821 µS/cm |
| 5 Mar 2026, 13:34 | 833 | 833 µS/cm |
| 3 Feb 2026, 12:10 | 817 | 817 µS/cm |
| 5 Jan 2026, 13:55 | 888 | 888 µS/cm |
| 2 Dec 2025, 10:14 | 819 | 819 µS/cm |
| 10 Nov 2025, 11:48 | 897 | 897 µS/cm |
| 17 Oct 2025, 08:56 | 910 | 910 µS/cm |
| 1 Sep 2025, 11:33 | 794 | 794 µS/cm |
| 21 Aug 2025, 13:57 | 905 | 905 µS/cm |
| 31 Jul 2025, 09:16 | 877 | 877 µS/cm |
| 11 Jun 2025, 13:00 | 843 | 843 µS/cm |
| 23 May 2025, 14:36 | 811 | 811 µS/cm |
| 2 Apr 2025, 10:16 | 782 | 782 µS/cm |
| 18 Mar 2025, 10:08 | 784 | 784 µS/cm |
| 4 Feb 2025, 12:26 | 782 | 782 µS/cm |
| 15 Jan 2025, 14:49 | 792 | 792 µS/cm |
| 11 Dec 2024, 09:42 | 668 | 668 µS/cm |
| 11 Nov 2024, 09:12 | 761 | 761 µS/cm |
| 9 Oct 2024, 09:22 | 714 | 714 µS/cm |
| 2 Sep 2024, 11:18 | 815 | 815 µS/cm |
| 9 Aug 2024, 08:38 | 805 | 805 µS/cm |
| 2 Jul 2024, 10:32 | 798 | 798 µS/cm |
| 6 Jun 2024, 11:09 | 784 | 784 µS/cm |
| 1 Mar 2024, 10:02 | 693 | 693 µS/cm |
| 5 Feb 2024, 12:25 | 788 | 788 µS/cm |
| 9 Jan 2024, 12:55 | 704 | 704 µS/cm |
| 4 Dec 2023, 11:51 | 856 | 856 µS/cm |
| 13 Nov 2023, 12:16 | 768 | 768 µS/cm |
| 23 Oct 2023, 13:36 | 785 | 785 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 | 34 | Oct 2023 – Sep 2026 | 78.5% 4 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 34 | Oct 2023 – Sep 2026 | 7.19 mg/l 4 Sep 2026 |
| Temperature of Water 0076 | River water | 34 | Oct 2023 – Sep 2026 | 19.5 °C 4 Sep 2026 |
| pH 0061 | River water | 34 | Oct 2023 – Sep 2026 | 7.41 4 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 34 | Oct 2023 – Sep 2026 | 0.16 mg/l 4 Sep 2026 |
| Nitrate as N 0117 | River water | 34 | Oct 2023 – Sep 2026 | 17 mg/l 4 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 34 | Oct 2023 – Sep 2026 | 0.4 mg/l 4 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 34 | Oct 2023 – Sep 2026 | 997 µS/cm 4 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 34 | Oct 2023 – Sep 2026 | 210 mg/l 4 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 34 | Oct 2023 – Sep 2026 | 0.00154 mg/l 4 Sep 2026 |
| Atrazine 3002 | River water | 2 | Nov 2023 – Feb 2024 | 0.0084 µg/l 5 Feb 2024 |
| Cadmium, Dissolved 0106 | River water | 2 | Nov 2023 – Feb 2024 | 0.019 µg/l 5 Feb 2024 |
| Calcium, Dissolved 0239 | River water | 8 | Nov 2023 – Jul 2026 | 120 mg/l 20 Jul 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 8 | Nov 2023 – Jul 2026 | 4.9 mg/l 20 Jul 2026 |
| Iron 6051 | River water | 6 | Apr 2025 – Jul 2026 | 85 µg/l 20 Jul 2026 |
| Iron, Dissolved 6460 | River water | 6 | Apr 2025 – Jul 2026 | 40 µg/l 20 Jul 2026 |
| Lead : BLM Bioavailable 3377 | River water | 2 | Nov 2023 – Feb 2024 | 0.07 µg/l 5 Feb 2024 |
| Lead, Dissolved 0052 | River water | 2 | Nov 2023 – Feb 2024 | 0.21 µg/l 5 Feb 2024 |
| Magnesium, Dissolved 0235 | River water | 8 | Nov 2023 – Jul 2026 | 5.1 mg/l 20 Jul 2026 |
| Mercury, Dissolved 0103 | River water | 2 | Nov 2023 – Feb 2024 | below 0.01 µg/l 5 Feb 2024 |
| Nickel : BLM Bioavailable 3878 | River water | 2 | Nov 2023 – Feb 2024 | 0.68 µg/l 5 Feb 2024 |
| Nickel, Dissolved 3410 | River water | 2 | Nov 2023 – Feb 2024 | 1.7 µg/l 5 Feb 2024 |
| Nitrite as N 0118 | River water | 34 | Oct 2023 – Sep 2026 | 0.035 mg/l 4 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 34 | Oct 2023 – Sep 2026 | 17 mg/l 4 Sep 2026 |
| Simazine 3001 | River water | 2 | Nov 2023 – Feb 2024 | below 0.003 µg/l 5 Feb 2024 |
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.