Cholsey Brook 500 m above Cholsey sewage treatment works
EA name: CHOLSEY BROOK 500M ABOVE CHOLSEY STW
Environment Agency sampling point TH-PTHR0015 · 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
- 9 Sep 2026, 08:4622 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 36 since 12 Oct 2023 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Environmental monitoring statutory (EU directives)
- Where
- National Grid 458653, 186829As published, to the nearest 1 m. Open in a map
- River, by its own name
- Cholsey Brook
- River, by the map
- Cholsey BrookPlaced on the river its name gives, 5 m from the line.
- Next gauge downstream
- Cleeve Lock On the River Thames · 8.6 km along the river
- Why it was sampled
- Environmental monitoring statutory (EU directives) (34 samples)
Monitoring (national agency policy) (2 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
93.4%
Sampled 9 Sep 2026, 22 days ago · 36 results banked
Every result (36)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Sep 2026, 08:46 | 93.4 | 93.4% |
| 24 Aug 2026, 13:55 | 102.1 | 102.1% |
| 10 Jul 2026, 13:05 | 97.2 | 97.2% |
| 25 Jun 2026, 13:36 | 91.9 | 91.9% |
| 15 May 2026, 13:39 | 94.4 | 94.4% |
| 27 Apr 2026, 14:35 | 101.2 | 101.2% |
| 6 Mar 2026, 10:26 | 87.3 | 87.3% |
| 6 Feb 2026, 09:06 | 74.9 | 74.9% |
| 16 Jan 2026, 13:11 | 79 | 79% |
| 1 Dec 2025, 14:01 | 84.1 | 84.1% |
| 5 Nov 2025, 08:27 | 77.1 | 77.1% |
| 2 Oct 2025, 10:00 | 89.3 | 89.3% |
| 11 Sep 2025, 14:28 | 91.3 | 91.3% |
| 13 Aug 2025, 11:47 | 101.6 | 101.6% |
| 23 Jul 2025, 11:11 | 94.4 | 94.4% |
| 13 Jun 2025, 13:44 | 93.5 | 93.5% |
| 27 May 2025, 12:40 | 87.4 | 87.4% |
| 11 Apr 2025, 11:47 | 97.6 | 97.6% |
| 3 Mar 2025, 14:33 | 87.4 | 87.4% |
| 11 Feb 2025, 12:13 | 80.3 | 80.3% |
| 22 Jan 2025, 08:16 | 86.2 | 86.2% |
| 5 Dec 2024, 13:57 | 82.9 | 82.9% |
| 21 Nov 2024, 09:28 | 75.7 | 75.7% |
| 16 Oct 2024, 16:11 | 70.7 | 70.7% |
| 20 Sep 2024, 13:05 | 88.2 | 88.2% |
| 2 Sep 2024, 13:30 | 89.7 | 89.7% |
| 17 Jul 2024, 10:03 | 91.5 | 91.5% |
| 17 Jun 2024, 13:26 | 90.4 | 90.4% |
| 13 May 2024, 08:24 | 85.1 | 85.1% |
| 18 Apr 2024, 14:34 | 98.3 | 98.3% |
| 19 Mar 2024, 14:24 | 92.4 | 92.4% |
| 21 Feb 2024, 12:17 | 81.6 | 81.6% |
| 15 Jan 2024, 10:38 | 78.7 | 78.7% |
| 4 Dec 2023, 14:50 | 72.8 | 72.8% |
| 20 Nov 2023, 13:53 | 67.7 | 67.7% |
| 12 Oct 2023, 11:38 | 78.1 | 78.1% |
Dissolved oxygen
as O2 · code 9924 · mg/l
10.1 mg/l
Sampled 9 Sep 2026, 22 days ago · 36 results banked
Every result (36)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Sep 2026, 08:46 | 10.1 | 10.1 mg/l |
| 24 Aug 2026, 13:55 | 10.6 | 10.6 mg/l |
| 10 Jul 2026, 13:05 | 9.33 | 9.33 mg/l |
| 25 Jun 2026, 13:36 | 8.16 | 8.16 mg/l |
| 15 May 2026, 13:39 | 10.6 | 10.6 mg/l |
| 27 Apr 2026, 14:35 | 10.6 | 10.6 mg/l |
| 6 Mar 2026, 10:26 | 9.98 | 9.98 mg/l |
| 6 Feb 2026, 09:06 | 8.64 | 8.64 mg/l |
| 16 Jan 2026, 13:11 | 9.36 | 9.36 mg/l |
| 1 Dec 2025, 14:01 | 9.5 | 9.5 mg/l |
| 5 Nov 2025, 08:27 | 8.16 | 8.16 mg/l |
| 2 Oct 2025, 10:00 | 9.69 | 9.69 mg/l |
| 11 Sep 2025, 14:28 | 9.47 | 9.47 mg/l |
| 13 Aug 2025, 11:47 | 10.1 | 10.1 mg/l |
| 23 Jul 2025, 11:11 | 9.7 | 9.7 mg/l |
| 13 Jun 2025, 13:44 | 9.28 | 9.28 mg/l |
| 27 May 2025, 12:40 | 9.31 | 9.31 mg/l |
| 11 Apr 2025, 11:47 | 11 | 11 mg/l |
| 3 Mar 2025, 14:33 | 10.3 | 10.3 mg/l |
| 11 Feb 2025, 12:13 | 9.69 | 9.69 mg/l |
| 22 Jan 2025, 08:16 | 10.6 | 10.6 mg/l |
| 5 Dec 2024, 13:57 | 9.12 | 9.12 mg/l |
| 21 Nov 2024, 09:28 | 9.29 | 9.29 mg/l |
| 16 Oct 2024, 16:11 | 7.33 | 7.33 mg/l |
| 20 Sep 2024, 13:05 | 9.07 | 9.07 mg/l |
| 2 Sep 2024, 13:30 | 8.74 | 8.74 mg/l |
| 17 Jul 2024, 10:03 | 9.55 | 9.55 mg/l |
| 17 Jun 2024, 13:26 | 9.42 | 9.42 mg/l |
| 13 May 2024, 08:24 | 8.99 | 8.99 mg/l |
| 18 Apr 2024, 14:34 | 10.8 | 10.8 mg/l |
| 19 Mar 2024, 14:24 | 10 | 10 mg/l |
| 21 Feb 2024, 12:17 | 9.24 | 9.24 mg/l |
| 15 Jan 2024, 10:38 | 9.83 | 9.83 mg/l |
| 4 Dec 2023, 14:50 | 8.42 | 8.42 mg/l |
| 20 Nov 2023, 13:53 | 7.52 | 7.52 mg/l |
| 12 Oct 2023, 11:38 | 8.27 | 8.27 mg/l |
Water temperature
code 0076 · °C
11.7 °C
Sampled 9 Sep 2026, 22 days ago · 36 results banked
Every result (36)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Sep 2026, 08:46 | 11.7 | 11.7 °C |
| 24 Aug 2026, 13:55 | 13.6 | 13.6 °C |
| 10 Jul 2026, 13:05 | 17.2 | 17.2 °C |
| 25 Jun 2026, 13:36 | 21.1 | 21.1 °C |
| 15 May 2026, 13:39 | 10.3 | 10.3 °C |
| 27 Apr 2026, 14:35 | 13.1 | 13.1 °C |
| 6 Mar 2026, 10:26 | 9.4 | 9.4 °C |
| 6 Feb 2026, 09:06 | 9 | 9 °C |
| 16 Jan 2026, 13:11 | 7.9 | 7.9 °C |
| 1 Dec 2025, 14:01 | 9.9 | 9.9 °C |
| 5 Nov 2025, 08:27 | 12.7 | 12.7 °C |
| 2 Oct 2025, 10:00 | 11.6 | 11.6 °C |
| 11 Sep 2025, 14:28 | 13.6 | 13.6 °C |
| 13 Aug 2025, 11:47 | 15.5 | 15.5 °C |
| 23 Jul 2025, 11:11 | 14 | 14 °C |
| 13 Jun 2025, 13:44 | 15.6 | 15.6 °C |
| 27 May 2025, 12:40 | 12.4 | 12.4 °C |
| 11 Apr 2025, 11:47 | 10.1 | 10.1 °C |
| 3 Mar 2025, 14:33 | 8.1 | 8.1 °C |
| 11 Feb 2025, 12:13 | 7.2 | 7.2 °C |
| 22 Jan 2025, 08:16 | 6.5 | 6.5 °C |
| 5 Dec 2024, 13:57 | 11 | 11 °C |
| 21 Nov 2024, 09:28 | 6.5 | 6.5 °C |
| 16 Oct 2024, 16:11 | 13.6 | 13.6 °C |
| 20 Sep 2024, 13:05 | 14 | 14 °C |
| 2 Sep 2024, 13:30 | 16.5 | 16.5 °C |
| 17 Jul 2024, 10:03 | 13.3 | 13.3 °C |
| 17 Jun 2024, 13:26 | 13.4 | 13.4 °C |
| 13 May 2024, 08:24 | 12.8 | 12.8 °C |
| 18 Apr 2024, 14:34 | 11.2 | 11.2 °C |
| 19 Mar 2024, 14:24 | 11.6 | 11.6 °C |
| 21 Feb 2024, 12:17 | 9.8 | 9.8 °C |
| 15 Jan 2024, 10:38 | 5.8 | 5.8 °C |
| 4 Dec 2023, 14:50 | 8.9 | 8.9 °C |
| 20 Nov 2023, 13:53 | 10.6 | 10.6 °C |
| 12 Oct 2023, 11:38 | 12.7 | 12.7 °C |
pH
code 0061
8.06
Sampled 9 Sep 2026, 22 days ago · 36 results banked
Every result (36)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Sep 2026, 08:46 | 8.06 | 8.06 |
| 24 Aug 2026, 13:55 | 8.11 | 8.11 |
| 10 Jul 2026, 13:05 | 7.99 | 7.99 |
| 25 Jun 2026, 13:36 | 7.95 | 7.95 |
| 15 May 2026, 13:39 | 7.84 | 7.84 |
| 27 Apr 2026, 14:35 | 7.98 | 7.98 |
| 6 Mar 2026, 10:26 | 7.7 | 7.7 |
| 6 Feb 2026, 09:06 | 7.57 | 7.57 |
| 16 Jan 2026, 13:11 | 7.5 | 7.5 |
| 1 Dec 2025, 14:01 | 7.73 | 7.73 |
| 5 Nov 2025, 08:27 | 7.88 | 7.88 |
| 2 Oct 2025, 10:00 | 7.88 | 7.88 |
| 11 Sep 2025, 14:28 | 8 | 8 |
| 13 Aug 2025, 11:47 | 8.15 | 8.15 |
| 23 Jul 2025, 11:11 | 8.08 | 8.08 |
| 13 Jun 2025, 13:44 | 7.81 | 7.81 |
| 27 May 2025, 12:40 | 7.96 | 7.96 |
| 11 Apr 2025, 11:47 | 7.79 | 7.79 |
| 3 Mar 2025, 14:33 | 7.52 | 7.52 |
| 11 Feb 2025, 12:13 | 7.55 | 7.55 |
| 22 Jan 2025, 08:16 | 7.66 | 7.66 |
| 5 Dec 2024, 13:57 | 7.55 | 7.55 |
| 21 Nov 2024, 09:28 | 7.56 | 7.56 |
| 16 Oct 2024, 16:11 | 7.46 | 7.46 |
| 20 Sep 2024, 13:05 | 7.55 | 7.55 |
| 2 Sep 2024, 13:30 | 7.89 | 7.89 |
| 17 Jul 2024, 10:03 | 7.85 | 7.85 |
| 17 Jun 2024, 13:26 | 7.81 | 7.81 |
| 13 May 2024, 08:24 | 7.87 | 7.87 |
| 18 Apr 2024, 14:34 | 7.9 | 7.9 |
| 19 Mar 2024, 14:24 | 7.61 | 7.61 |
| 21 Feb 2024, 12:17 | 7.63 | 7.63 |
| 15 Jan 2024, 10:38 | 7.7 | 7.7 |
| 4 Dec 2023, 14:50 | 7.52 | 7.52 |
| 20 Nov 2023, 13:53 | 7.5 | 7.5 |
| 12 Oct 2023, 11:38 | 7.49 | 7.49 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 9 Sep 2026, 22 days ago · 35 results banked
Every result (35)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Sep 2026, 08:46 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Aug 2026, 13:55 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Jul 2026, 13:05 | <0.03 | below 0.03 mg/l (not detected above this) |
| 25 Jun 2026, 13:36 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 May 2026, 13:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 27 Apr 2026, 14:35 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Mar 2026, 10:26 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Feb 2026, 09:06 | 0.043 | 0.043 mg/l |
| 16 Jan 2026, 13:11 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Dec 2025, 14:01 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Nov 2025, 08:27 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Oct 2025, 10:00 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Sep 2025, 14:28 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Aug 2025, 11:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Jul 2025, 11:11 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Jun 2025, 13:44 | <0.03 | below 0.03 mg/l (not detected above this) |
| 27 May 2025, 12:40 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Apr 2025, 11:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Mar 2025, 14:33 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Feb 2025, 12:13 | 0.046 | 0.046 mg/l |
| 22 Jan 2025, 08:16 | 0.042 | 0.042 mg/l |
| 21 Nov 2024, 09:28 | 0.042 | 0.042 mg/l |
| 16 Oct 2024, 16:11 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Sep 2024, 13:05 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Sep 2024, 13:30 | 0.053 | 0.053 mg/l |
| 17 Jul 2024, 10:03 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Jun 2024, 13:26 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 May 2024, 08:24 | 0.031 | 0.031 mg/l |
| 18 Apr 2024, 14:34 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Mar 2024, 14:24 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Feb 2024, 12:17 | 0.035 | 0.035 mg/l |
| 15 Jan 2024, 10:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Dec 2023, 14:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Nov 2023, 13:53 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Oct 2023, 11:38 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
11 mg/l
Sampled 9 Sep 2026, 22 days ago · 35 results banked
Every result (35)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Sep 2026, 08:46 | 11 | 11 mg/l |
| 24 Aug 2026, 13:55 | 12 | 12 mg/l |
| 10 Jul 2026, 13:05 | 11 | 11 mg/l |
| 25 Jun 2026, 13:36 | 11 | 11 mg/l |
| 15 May 2026, 13:39 | 9.99 | 9.99 mg/l |
| 27 Apr 2026, 14:35 | 9.99 | 9.99 mg/l |
| 6 Mar 2026, 10:26 | 9.49 | 9.49 mg/l |
| 6 Feb 2026, 09:06 | 7.59 | 7.59 mg/l |
| 16 Jan 2026, 13:11 | 7.89 | 7.89 mg/l |
| 1 Dec 2025, 14:01 | 7.19 | 7.19 mg/l |
| 5 Nov 2025, 08:27 | 7.07 | 7.07 mg/l |
| 2 Oct 2025, 10:00 | 9.79 | 9.79 mg/l |
| 11 Sep 2025, 14:28 | 8.78 | 8.78 mg/l |
| 13 Aug 2025, 11:47 | 11 | 11 mg/l |
| 23 Jul 2025, 11:11 | 12 | 12 mg/l |
| 13 Jun 2025, 13:44 | 11 | 11 mg/l |
| 27 May 2025, 12:40 | 11 | 11 mg/l |
| 11 Apr 2025, 11:47 | 9.89 | 9.89 mg/l |
| 3 Mar 2025, 14:33 | 9.59 | 9.59 mg/l |
| 11 Feb 2025, 12:13 | 8.28 | 8.28 mg/l |
| 22 Jan 2025, 08:16 | 9.19 | 9.19 mg/l |
| 21 Nov 2024, 09:28 | 7.59 | 7.59 mg/l |
| 16 Oct 2024, 16:11 | 7.88 | 7.88 mg/l |
| 20 Sep 2024, 13:05 | 8.69 | 8.69 mg/l |
| 2 Sep 2024, 13:30 | 9.58 | 9.58 mg/l |
| 17 Jul 2024, 10:03 | 8.38 | 8.38 mg/l |
| 17 Jun 2024, 13:26 | 9.48 | 9.48 mg/l |
| 13 May 2024, 08:24 | 9.28 | 9.28 mg/l |
| 18 Apr 2024, 14:34 | 9.79 | 9.79 mg/l |
| 19 Mar 2024, 14:24 | 9.49 | 9.49 mg/l |
| 21 Feb 2024, 12:17 | 8.29 | 8.29 mg/l |
| 15 Jan 2024, 10:38 | 8.99 | 8.99 mg/l |
| 4 Dec 2023, 14:50 | 6.28 | 6.28 mg/l |
| 20 Nov 2023, 13:53 | 7.08 | 7.08 mg/l |
| 12 Oct 2023, 11:38 | 6.68 | 6.68 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.014 mg/l
Sampled 9 Sep 2026, 22 days ago · 35 results banked
Every result (35)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Sep 2026, 08:46 | 0.014 | 0.014 mg/l |
| 24 Aug 2026, 13:55 | 0.014 | 0.014 mg/l |
| 10 Jul 2026, 13:05 | 0.026 | 0.026 mg/l |
| 25 Jun 2026, 13:36 | 0.033 | 0.033 mg/l |
| 15 May 2026, 13:39 | 0.024 | 0.024 mg/l |
| 27 Apr 2026, 14:35 | 0.02 | 0.02 mg/l |
| 6 Mar 2026, 10:26 | 0.027 | 0.027 mg/l |
| 6 Feb 2026, 09:06 | 0.046 | 0.046 mg/l |
| 16 Jan 2026, 13:11 | 0.052 | 0.052 mg/l |
| 1 Dec 2025, 14:01 | 0.039 | 0.039 mg/l |
| 5 Nov 2025, 08:27 | 0.014 | 0.014 mg/l |
| 2 Oct 2025, 10:00 | 0.021 | 0.021 mg/l |
| 11 Sep 2025, 14:28 | 0.028 | 0.028 mg/l |
| 13 Aug 2025, 11:47 | 0.025 | 0.025 mg/l |
| 23 Jul 2025, 11:11 | 0.031 | 0.031 mg/l |
| 13 Jun 2025, 13:44 | 0.033 | 0.033 mg/l |
| 27 May 2025, 12:40 | 0.036 | 0.036 mg/l |
| 11 Apr 2025, 11:47 | 0.017 | 0.017 mg/l |
| 3 Mar 2025, 14:33 | 0.016 | 0.016 mg/l |
| 11 Feb 2025, 12:13 | 0.029 | 0.029 mg/l |
| 22 Jan 2025, 08:16 | 0.023 | 0.023 mg/l |
| 21 Nov 2024, 09:28 | 0.028 | 0.028 mg/l |
| 16 Oct 2024, 16:11 | 0.026 | 0.026 mg/l |
| 20 Sep 2024, 13:05 | 0.039 | 0.039 mg/l |
| 2 Sep 2024, 13:30 | 0.016 | 0.016 mg/l |
| 17 Jul 2024, 10:03 | 0.022 | 0.022 mg/l |
| 17 Jun 2024, 13:26 | 0.027 | 0.027 mg/l |
| 13 May 2024, 08:24 | 0.02 | 0.02 mg/l |
| 18 Apr 2024, 14:34 | 0.018 | 0.018 mg/l |
| 19 Mar 2024, 14:24 | 0.018 | 0.018 mg/l |
| 21 Feb 2024, 12:17 | 0.029 | 0.029 mg/l |
| 15 Jan 2024, 10:38 | 0.024 | 0.024 mg/l |
| 4 Dec 2023, 14:50 | 0.028 | 0.028 mg/l |
| 20 Nov 2023, 13:53 | 0.02 | 0.02 mg/l |
| 12 Oct 2023, 11:38 | 0.018 | 0.018 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
622 µS/cm
Sampled 9 Sep 2026, 22 days ago · 36 results banked
Every result (36)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Sep 2026, 08:46 | 622 | 622 µS/cm |
| 24 Aug 2026, 13:55 | 610 | 610 µS/cm |
| 10 Jul 2026, 13:05 | 620 | 620 µS/cm |
| 25 Jun 2026, 13:36 | 598 | 598 µS/cm |
| 15 May 2026, 13:39 | 644 | 644 µS/cm |
| 27 Apr 2026, 14:35 | 653 | 653 µS/cm |
| 6 Mar 2026, 10:26 | 702 | 702 µS/cm |
| 6 Feb 2026, 09:06 | 680 | 680 µS/cm |
| 16 Jan 2026, 13:11 | 733 | 733 µS/cm |
| 1 Dec 2025, 14:01 | 774 | 774 µS/cm |
| 5 Nov 2025, 08:27 | 732 | 732 µS/cm |
| 2 Oct 2025, 10:00 | 651 | 651 µS/cm |
| 11 Sep 2025, 14:28 | 644 | 644 µS/cm |
| 13 Aug 2025, 11:47 | 618 | 618 µS/cm |
| 23 Jul 2025, 11:11 | 611 | 611 µS/cm |
| 13 Jun 2025, 13:44 | 637 | 637 µS/cm |
| 27 May 2025, 12:40 | 651 | 651 µS/cm |
| 11 Apr 2025, 11:47 | 673 | 673 µS/cm |
| 3 Mar 2025, 14:33 | 708 | 708 µS/cm |
| 11 Feb 2025, 12:13 | 705 | 705 µS/cm |
| 22 Jan 2025, 08:16 | 704 | 704 µS/cm |
| 5 Dec 2024, 13:57 | 716 | 716 µS/cm |
| 21 Nov 2024, 09:28 | 737 | 737 µS/cm |
| 16 Oct 2024, 16:11 | 723 | 723 µS/cm |
| 20 Sep 2024, 13:05 | 688 | 688 µS/cm |
| 2 Sep 2024, 13:30 | 644 | 644 µS/cm |
| 17 Jul 2024, 10:03 | 668 | 668 µS/cm |
| 17 Jun 2024, 13:26 | 668 | 668 µS/cm |
| 13 May 2024, 08:24 | 693 | 693 µS/cm |
| 18 Apr 2024, 14:34 | 686 | 686 µS/cm |
| 19 Mar 2024, 14:24 | 709 | 709 µS/cm |
| 21 Feb 2024, 12:17 | 713 | 713 µS/cm |
| 15 Jan 2024, 10:38 | 724 | 724 µS/cm |
| 4 Dec 2023, 14:50 | 746 | 746 µS/cm |
| 20 Nov 2023, 13:53 | 751 | 751 µS/cm |
| 12 Oct 2023, 11:38 | 674 | 674 µS/cm |
Everything measured here
60 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 60 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 36 | Oct 2023 – Sep 2026 | 93.4% 9 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 36 | Oct 2023 – Sep 2026 | 10.1 mg/l 9 Sep 2026 |
| Temperature of Water 0076 | River water | 36 | Oct 2023 – Sep 2026 | 11.7 °C 9 Sep 2026 |
| pH 0061 | River water | 36 | Oct 2023 – Sep 2026 | 8.06 9 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 35 | Oct 2023 – Sep 2026 | below 0.03 mg/l 9 Sep 2026 |
| Nitrate as N 0117 | River water | 35 | Oct 2023 – Sep 2026 | 11 mg/l 9 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 35 | Oct 2023 – Sep 2026 | 0.014 mg/l 9 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 36 | Oct 2023 – Sep 2026 | 622 µS/cm 9 Sep 2026 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 1 | Oct 2024 – Oct 2024 | below 0.001 µg/l 16 Oct 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 1 | Oct 2024 – Oct 2024 | below 0.001 µg/l 16 Oct 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 1 | Oct 2024 – Oct 2024 | below 0.001 µg/l 16 Oct 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 1 | Oct 2024 – Oct 2024 | below 0.002 µg/l 16 Oct 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 16 Oct 2024 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 1 | Oct 2024 – Oct 2024 | below 0.001 µg/l 16 Oct 2024 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 16 Oct 2024 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 1 | Oct 2024 – Oct 2024 | below 0.004 µg/l 16 Oct 2024 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 1 | Oct 2024 – Oct 2024 | below 0.005 µg/l 16 Oct 2024 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 16 Oct 2024 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 1 | Oct 2024 – Oct 2024 | below 0.001 µg/l 16 Oct 2024 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 1 | Oct 2024 – Oct 2024 | below 0.001 µg/l 16 Oct 2024 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 16 Oct 2024 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 35 | Oct 2023 – Sep 2026 | 220 mg/l 9 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 35 | Oct 2023 – Sep 2026 | below 0.00062 mg/l 9 Sep 2026 |
| BOD : 5 Day ATU 0085 | River water | 30 | Oct 2023 – Apr 2026 | below 1 mg/l 27 Apr 2026 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 1 | Oct 2024 – Oct 2024 | below 0.001 µg/l 16 Oct 2024 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 1 | Oct 2024 – Oct 2024 | below 0.002 µg/l 16 Oct 2024 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 1 | Oct 2024 – Oct 2024 | below 0.002 µg/l 16 Oct 2024 |
| Nitrite as N 0118 | River water | 35 | Oct 2023 – Sep 2026 | 0.0061 mg/l 9 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 35 | Oct 2023 – Sep 2026 | 11 mg/l 9 Sep 2026 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 16 Oct 2024 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 16 Oct 2024 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 16 Oct 2024 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 16 Oct 2024 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 16 Oct 2024 |
| Perfluorobutanesulfonic acid 2972 | River water | 1 | Oct 2024 – Oct 2024 | below 0.001 µg/l 16 Oct 2024 |
| Perfluorobutanoic acid 2995 | River water | 1 | Oct 2024 – Oct 2024 | below 0.001 µg/l 16 Oct 2024 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 16 Oct 2024 |
| Perfluorodecanesulfonic acid 2969 | River water | 1 | Oct 2024 – Oct 2024 | below 0.002 µg/l 16 Oct 2024 |
| Perfluorodecanoic acid 8892 | River water | 1 | Oct 2024 – Oct 2024 | below 0.002 µg/l 16 Oct 2024 |
| Perfluorododecane sulfonic acid 2968 | River water | 1 | Oct 2024 – Oct 2024 | below 0.005 µg/l 16 Oct 2024 |
| Perfluorododecanoic acid 8894 | River water | 1 | Oct 2024 – Oct 2024 | below 0.002 µg/l 16 Oct 2024 |
| Perfluoroheptanesulfonic acid 2967 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 16 Oct 2024 |
| Perfluoroheptanoic acid 8889 | River water | 1 | Oct 2024 – Oct 2024 | below 0.001 µg/l 16 Oct 2024 |
| Perfluorohexanesulfonamide 2965 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 16 Oct 2024 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 16 Oct 2024 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 16 Oct 2024 |
| Perfluorohexanoic acid 8888 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 16 Oct 2024 |
| Perfluorononanesulfonic acid 2963 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 16 Oct 2024 |
| Perfluorononanoic acid 8891 | River water | 1 | Oct 2024 – Oct 2024 | below 0.001 µg/l 16 Oct 2024 |
| Perfluorooctadecanoic acid 2962 | River water | 1 | Oct 2024 – Oct 2024 | below 0.002 µg/l 16 Oct 2024 |
| Perfluorooctanesulfonamide 2961 | River water | 1 | Oct 2024 – Oct 2024 | below 0.001 µg/l 16 Oct 2024 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 16 Oct 2024 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 16 Oct 2024 |
| Perfluorooctanoic acid 8890 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 16 Oct 2024 |
| Perfluoropentanesulfonic acid 2957 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 16 Oct 2024 |
| Perfluoropentanoic acid 8887 | River water | 1 | Oct 2024 – Oct 2024 | below 0.001 µg/l 16 Oct 2024 |
| Perfluorotetradecanoic acid 8895 | River water | 1 | Oct 2024 – Oct 2024 | below 0.006 µg/l 16 Oct 2024 |
| Perfluorotridecanoic acid 2955 | River water | 1 | Oct 2024 – Oct 2024 | below 0.005 µg/l 16 Oct 2024 |
| Perfluoroundecane sulfonic acid 2953 | River water | 1 | Oct 2024 – Oct 2024 | below 0.004 µg/l 16 Oct 2024 |
| Perfluoroundecanoic acid 8893 | River water | 1 | Oct 2024 – Oct 2024 | below 0.002 µg/l 16 Oct 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.