Thames at Henley Bridge
EA name: THAMES AT HENLEY BRIDGE
Environment Agency sampling point TH-PTHR0088 · 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 Sep 2026, 14:0914 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 33 since 11 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) · results completed 22 Sep 2026
- Where
- National Grid 476319, 182813As published, to the nearest 1 m. Open in a map
- River, by its own name
- Thames
- River, by the map
- River ThamesPlaced on the river its name gives, 49 m from the line.
- Next gauge downstream
- Hambleden Lock On the River Thames · 3.6 km along the river
- Nearest gauge upstream
- Marsh Lock On the River Thames · 1.6 km along the river
- Why it was sampled
- Environmental monitoring statutory (EU directives) (33 samples)
Results here were completed a median of 7 days after the sample was taken (3 to 35 days, 12 samples).
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
103.7%
Sampled 17 Sep 2026, 14 days ago · 33 results banked
Every result (33)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Sep 2026, 14:09 | 103.7 | 103.7% |
| 13 Aug 2026, 09:34 | 87.3 | 87.3% |
| 21 Jul 2026, 13:36 | 124 | 124% |
| 12 Jun 2026, 14:23 | 99.2 | 99.2% |
| 21 May 2026, 10:59 | 99.5 | 99.5% |
| 30 Apr 2026, 12:24 | 108.4 | 108.4% |
| 5 Mar 2026, 13:11 | 102.9 | 102.9% |
| 30 Jan 2026, 10:41 | 89 | 89% |
| 5 Dec 2025, 12:46 | 102.1 | 102.1% |
| 20 Nov 2025, 09:16 | 94.5 | 94.5% |
| 17 Oct 2025, 12:40 | 92.9 | 92.9% |
| 17 Sep 2025, 13:26 | 94.3 | 94.3% |
| 18 Aug 2025, 12:55 | 94.5 | 94.5% |
| 2 Jul 2025, 08:57 | 88 | 88% |
| 13 Jun 2025, 09:10 | 94.3 | 94.3% |
| 9 May 2025, 09:36 | 100.6 | 100.6% |
| 3 Apr 2025, 09:37 | 101.4 | 101.4% |
| 5 Mar 2025, 08:51 | 100 | 100% |
| 14 Feb 2025, 09:17 | 99.5 | 99.5% |
| 9 Jan 2025, 12:48 | 95 | 95% |
| 4 Dec 2024, 11:36 | 91.6 | 91.6% |
| 13 Nov 2024, 12:27 | 98.6 | 98.6% |
| 3 Oct 2024, 12:17 | 87.5 | 87.5% |
| 6 Sep 2024, 11:51 | 91.4 | 91.4% |
| 21 Aug 2024, 14:20 | 105 | 105% |
| 15 Jul 2024, 13:28 | 100.8 | 100.8% |
| 24 Jun 2024, 11:20 | 108.5 | 108.5% |
| 5 Mar 2024, 14:14 | 101.9 | 101.9% |
| 5 Feb 2024, 13:58 | 98.8 | 98.8% |
| 18 Jan 2024, 12:01 | 100.3 | 100.3% |
| 1 Dec 2023, 13:14 | 99.9 | 99.9% |
| 3 Nov 2023, 09:48 | 91.8 | 91.8% |
| 11 Oct 2023, 14:41 | 96.8 | 96.8% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.75 mg/l
Sampled 17 Sep 2026, 14 days ago · 33 results banked
Every result (33)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Sep 2026, 14:09 | 9.75 | 9.75 mg/l |
| 13 Aug 2026, 09:34 | 7.67 | 7.67 mg/l |
| 21 Jul 2026, 13:36 | 10.7 | 10.7 mg/l |
| 12 Jun 2026, 14:23 | 9.6 | 9.6 mg/l |
| 21 May 2026, 10:59 | 10 | 10 mg/l |
| 30 Apr 2026, 12:24 | 11 | 11 mg/l |
| 5 Mar 2026, 13:11 | 11.3 | 11.3 mg/l |
| 30 Jan 2026, 10:41 | 11 | 11 mg/l |
| 5 Dec 2025, 12:46 | 12.3 | 12.3 mg/l |
| 20 Nov 2025, 09:16 | 11.7 | 11.7 mg/l |
| 17 Oct 2025, 12:40 | 9.72 | 9.72 mg/l |
| 17 Sep 2025, 13:26 | 9.36 | 9.36 mg/l |
| 18 Aug 2025, 12:55 | 8.55 | 8.55 mg/l |
| 2 Jul 2025, 08:57 | 7.56 | 7.56 mg/l |
| 13 Jun 2025, 09:10 | 8.94 | 8.94 mg/l |
| 9 May 2025, 09:36 | 10.5 | 10.5 mg/l |
| 3 Apr 2025, 09:37 | 11.1 | 11.1 mg/l |
| 5 Mar 2025, 08:51 | 12.8 | 12.8 mg/l |
| 14 Feb 2025, 09:17 | 12.7 | 12.7 mg/l |
| 9 Jan 2025, 12:48 | 12.6 | 12.6 mg/l |
| 4 Dec 2024, 11:36 | 10.9 | 10.9 mg/l |
| 13 Nov 2024, 12:27 | 11.1 | 11.1 mg/l |
| 3 Oct 2024, 12:17 | 9.26 | 9.26 mg/l |
| 6 Sep 2024, 11:51 | 8.72 | 8.72 mg/l |
| 21 Aug 2024, 14:20 | 9.83 | 9.83 mg/l |
| 15 Jul 2024, 13:28 | 9.66 | 9.66 mg/l |
| 24 Jun 2024, 11:20 | 10.1 | 10.1 mg/l |
| 5 Mar 2024, 14:14 | 12 | 12 mg/l |
| 5 Feb 2024, 13:58 | 11.2 | 11.2 mg/l |
| 18 Jan 2024, 12:01 | 13.5 | 13.5 mg/l |
| 1 Dec 2023, 13:14 | 12.6 | 12.6 mg/l |
| 3 Nov 2023, 09:48 | 10.2 | 10.2 mg/l |
| 11 Oct 2023, 14:41 | 9.53 | 9.53 mg/l |
Water temperature
code 0076 · °C
18.2 °C
Sampled 17 Sep 2026, 14 days ago · 33 results banked
Every result (33)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Sep 2026, 14:09 | 18.2 | 18.2 °C |
| 13 Aug 2026, 09:34 | 21.6 | 21.6 °C |
| 21 Jul 2026, 13:36 | 22.5 | 22.5 °C |
| 12 Jun 2026, 14:23 | 16.8 | 16.8 °C |
| 21 May 2026, 10:59 | 15 | 15 °C |
| 30 Apr 2026, 12:24 | 14.6 | 14.6 °C |
| 5 Mar 2026, 13:11 | 10.9 | 10.9 °C |
| 30 Jan 2026, 10:41 | 6.3 | 6.3 °C |
| 5 Dec 2025, 12:46 | 7.2 | 7.2 °C |
| 20 Nov 2025, 09:16 | 6 | 6 °C |
| 17 Oct 2025, 12:40 | 13.2 | 13.2 °C |
| 17 Sep 2025, 13:26 | 15.6 | 15.6 °C |
| 18 Aug 2025, 12:55 | 20.1 | 20.1 °C |
| 2 Jul 2025, 08:57 | 22.8 | 22.8 °C |
| 13 Jun 2025, 09:10 | 17.8 | 17.8 °C |
| 9 May 2025, 09:36 | 13.5 | 13.5 °C |
| 3 Apr 2025, 09:37 | 11.2 | 11.2 °C |
| 5 Mar 2025, 08:51 | 5 | 5 °C |
| 14 Feb 2025, 09:17 | 5.1 | 5.1 °C |
| 9 Jan 2025, 12:48 | 3.5 | 3.5 °C |
| 4 Dec 2024, 11:36 | 7.9 | 7.9 °C |
| 13 Nov 2024, 12:27 | 9.9 | 9.9 °C |
| 3 Oct 2024, 12:17 | 12.7 | 12.7 °C |
| 6 Sep 2024, 11:51 | 17.5 | 17.5 °C |
| 21 Aug 2024, 14:20 | 18.4 | 18.4 °C |
| 15 Jul 2024, 13:28 | 17.3 | 17.3 °C |
| 24 Jun 2024, 11:20 | 18.7 | 18.7 °C |
| 5 Mar 2024, 14:14 | 8 | 8 °C |
| 5 Feb 2024, 13:58 | 9.7 | 9.7 °C |
| 18 Jan 2024, 12:01 | 3 | 3 °C |
| 1 Dec 2023, 13:14 | 5.5 | 5.5 °C |
| 3 Nov 2023, 09:48 | 10.6 | 10.6 °C |
| 11 Oct 2023, 14:41 | 16 | 16 °C |
pH
code 0061
8.03
Sampled 17 Sep 2026, 14 days ago · 33 results banked
Every result (33)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Sep 2026, 14:09 | 8.03 | 8.03 |
| 13 Aug 2026, 09:34 | 7.85 | 7.85 |
| 21 Jul 2026, 13:36 | 8.23 | 8.23 |
| 12 Jun 2026, 14:23 | 8.06 | 8.06 |
| 21 May 2026, 10:59 | 8.1 | 8.1 |
| 30 Apr 2026, 12:24 | 8.31 | 8.31 |
| 5 Mar 2026, 13:11 | 8.09 | 8.09 |
| 30 Jan 2026, 10:41 | 8.02 | 8.02 |
| 5 Dec 2025, 12:46 | 8.15 | 8.15 |
| 20 Nov 2025, 09:16 | 8.16 | 8.16 |
| 17 Oct 2025, 12:40 | 7.81 | 7.81 |
| 17 Sep 2025, 13:26 | 7.94 | 7.94 |
| 18 Aug 2025, 12:55 | 8.05 | 8.05 |
| 2 Jul 2025, 08:57 | 7.86 | 7.86 |
| 13 Jun 2025, 09:10 | 7.88 | 7.88 |
| 9 May 2025, 09:36 | 8.32 | 8.32 |
| 3 Apr 2025, 09:37 | 8.26 | 8.26 |
| 5 Mar 2025, 08:51 | 8.23 | 8.23 |
| 14 Feb 2025, 09:17 | 8.11 | 8.11 |
| 9 Jan 2025, 12:48 | 7.8 | 7.8 |
| 4 Dec 2024, 11:36 | 8.02 | 8.02 |
| 13 Nov 2024, 12:27 | 8.09 | 8.09 |
| 3 Oct 2024, 12:17 | 7.69 | 7.69 |
| 6 Sep 2024, 11:51 | 7.76 | 7.76 |
| 21 Aug 2024, 14:20 | 8.12 | 8.12 |
| 15 Jul 2024, 13:28 | 8.13 | 8.13 |
| 24 Jun 2024, 11:20 | 8.24 | 8.24 |
| 5 Mar 2024, 14:14 | 8.2 | 8.2 |
| 5 Feb 2024, 13:58 | 8.06 | 8.06 |
| 18 Jan 2024, 12:01 | 8.06 | 8.06 |
| 1 Dec 2023, 13:14 | 8.15 | 8.15 |
| 3 Nov 2023, 09:48 | 7.95 | 7.95 |
| 11 Oct 2023, 14:41 | 7.98 | 7.98 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.12 mg/l
Sampled 17 Sep 2026, 14 days ago · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Sep 2026, 14:09 | 0.12 | 0.12 mg/l |
| 13 Aug 2026, 09:34 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Jul 2026, 13:36 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Jun 2026, 14:23 | 0.11 | 0.11 mg/l |
| 21 May 2026, 10:59 | 0.11 | 0.11 mg/l |
| 30 Apr 2026, 12:24 | 0.042 | 0.042 mg/l |
| 5 Mar 2026, 13:11 | <0.03 | below 0.03 mg/l (not detected above this) |
| 30 Jan 2026, 10:41 | 0.035 | 0.035 mg/l |
| 5 Dec 2025, 12:46 | 0.034 | 0.034 mg/l |
| 20 Nov 2025, 09:16 | 0.066 | 0.066 mg/l |
| 17 Oct 2025, 12:40 | 0.18 | 0.18 mg/l |
| 17 Sep 2025, 13:26 | 0.065 | 0.065 mg/l |
| 18 Aug 2025, 12:55 | 0.045 | 0.045 mg/l |
| 2 Jul 2025, 08:57 | 0.17 | 0.17 mg/l |
| 13 Jun 2025, 09:10 | 0.13 | 0.13 mg/l |
| 9 May 2025, 09:36 | 0.079 | 0.079 mg/l |
| 5 Mar 2025, 08:51 | 0.038 | 0.038 mg/l |
| 14 Feb 2025, 09:17 | 0.043 | 0.043 mg/l |
| 9 Jan 2025, 12:48 | 0.062 | 0.062 mg/l |
| 4 Dec 2024, 11:36 | 0.035 | 0.035 mg/l |
| 13 Nov 2024, 12:27 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Oct 2024, 12:17 | 0.041 | 0.041 mg/l |
| 6 Sep 2024, 11:51 | 0.25 | 0.25 mg/l |
| 21 Aug 2024, 14:20 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Jul 2024, 13:28 | 0.046 | 0.046 mg/l |
| 24 Jun 2024, 11:20 | 0.099 | 0.099 mg/l |
| 5 Mar 2024, 14:14 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Feb 2024, 13:58 | 0.082 | 0.082 mg/l |
| 18 Jan 2024, 12:01 | 0.099 | 0.099 mg/l |
| 1 Dec 2023, 13:14 | 0.065 | 0.065 mg/l |
| 3 Nov 2023, 09:48 | 0.06 | 0.06 mg/l |
| 11 Oct 2023, 14:41 | 0.072 | 0.072 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
9.44 mg/l
Sampled 17 Sep 2026, 14 days ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Sep 2026, 14:09 | 9.44 | 9.44 mg/l |
| 13 Aug 2026, 09:34 | 8.47 | 8.47 mg/l |
| 21 Jul 2026, 13:36 | 7.77 | 7.77 mg/l |
| 12 Jun 2026, 14:23 | 7.16 | 7.16 mg/l |
| 21 May 2026, 10:59 | 8.27 | 8.27 mg/l |
| 30 Apr 2026, 12:24 | 7.88 | 7.88 mg/l |
| 5 Mar 2026, 13:11 | 5.89 | 5.89 mg/l |
| 30 Jan 2026, 10:41 | 5.08 | 5.08 mg/l |
| 5 Dec 2025, 12:46 | 7.88 | 7.88 mg/l |
| 20 Nov 2025, 09:16 | 7.27 | 7.27 mg/l |
| 17 Oct 2025, 12:40 | 9.24 | 9.24 mg/l |
| 17 Sep 2025, 13:26 | 7.77 | 7.77 mg/l |
| 18 Aug 2025, 12:55 | 8.27 | 8.27 mg/l |
| 2 Jul 2025, 08:57 | 7.95 | 7.95 mg/l |
| 13 Jun 2025, 09:10 | 7.86 | 7.86 mg/l |
| 9 May 2025, 09:36 | 7.88 | 7.88 mg/l |
| 5 Mar 2025, 08:51 | 6.08 | 6.08 mg/l |
| 14 Feb 2025, 09:17 | 5.97 | 5.97 mg/l |
| 9 Jan 2025, 12:48 | 4.27 | 4.27 mg/l |
| 13 Nov 2024, 12:27 | 7.29 | 7.29 mg/l |
| 3 Oct 2024, 12:17 | 3.78 | 3.78 mg/l |
| 6 Sep 2024, 11:51 | 7.76 | 7.76 mg/l |
| 21 Aug 2024, 14:20 | 7.58 | 7.58 mg/l |
| 15 Jul 2024, 13:28 | 6.98 | 6.98 mg/l |
| 24 Jun 2024, 11:20 | 6.97 | 6.97 mg/l |
| 5 Mar 2024, 14:14 | 4.48 | 4.48 mg/l |
| 5 Feb 2024, 13:58 | 7.17 | 7.17 mg/l |
| 18 Jan 2024, 12:01 | 6.87 | 6.87 mg/l |
| 1 Dec 2023, 13:14 | 6.38 | 6.38 mg/l |
| 3 Nov 2023, 09:48 | 4.38 | 4.38 mg/l |
| 11 Oct 2023, 14:41 | 7.38 | 7.38 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.17 mg/l
Sampled 17 Sep 2026, 14 days ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Sep 2026, 14:09 | 0.17 | 0.17 mg/l |
| 13 Aug 2026, 09:34 | 0.13 | 0.13 mg/l |
| 21 Jul 2026, 13:36 | 0.09 | 0.09 mg/l |
| 12 Jun 2026, 14:23 | 0.17 | 0.17 mg/l |
| 21 May 2026, 10:59 | 0.12 | 0.12 mg/l |
| 30 Apr 2026, 12:24 | 0.049 | 0.049 mg/l |
| 5 Mar 2026, 13:11 | 0.058 | 0.058 mg/l |
| 30 Jan 2026, 10:41 | 0.11 | 0.11 mg/l |
| 5 Dec 2025, 12:46 | 0.14 | 0.14 mg/l |
| 20 Nov 2025, 09:16 | 0.19 | 0.19 mg/l |
| 17 Oct 2025, 12:40 | 0.18 | 0.18 mg/l |
| 17 Sep 2025, 13:26 | 0.17 | 0.17 mg/l |
| 18 Aug 2025, 12:55 | 0.15 | 0.15 mg/l |
| 2 Jul 2025, 08:57 | 0.16 | 0.16 mg/l |
| 13 Jun 2025, 09:10 | 0.15 | 0.15 mg/l |
| 9 May 2025, 09:36 | 0.099 | 0.099 mg/l |
| 5 Mar 2025, 08:51 | 0.072 | 0.072 mg/l |
| 14 Feb 2025, 09:17 | 0.094 | 0.094 mg/l |
| 9 Jan 2025, 12:48 | 0.13 | 0.13 mg/l |
| 13 Nov 2024, 12:27 | 0.1 | 0.1 mg/l |
| 3 Oct 2024, 12:17 | 0.12 | 0.12 mg/l |
| 6 Sep 2024, 11:51 | 0.17 | 0.17 mg/l |
| 21 Aug 2024, 14:20 | 0.17 | 0.17 mg/l |
| 15 Jul 2024, 13:28 | 0.16 | 0.16 mg/l |
| 24 Jun 2024, 11:20 | 0.11 | 0.11 mg/l |
| 5 Mar 2024, 14:14 | 0.053 | 0.053 mg/l |
| 5 Feb 2024, 13:58 | 0.1 | 0.1 mg/l |
| 18 Jan 2024, 12:01 | 0.088 | 0.088 mg/l |
| 1 Dec 2023, 13:14 | 0.1 | 0.1 mg/l |
| 3 Nov 2023, 09:48 | 0.16 | 0.16 mg/l |
| 11 Oct 2023, 14:41 | 0.17 | 0.17 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
751 µS/cm
Sampled 17 Sep 2026, 14 days ago · 33 results banked
Every result (33)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Sep 2026, 14:09 | 751 | 751 µS/cm |
| 13 Aug 2026, 09:34 | 747 | 747 µS/cm |
| 21 Jul 2026, 13:36 | 716 | 716 µS/cm |
| 12 Jun 2026, 14:23 | 653 | 653 µS/cm |
| 21 May 2026, 10:59 | 674 | 674 µS/cm |
| 30 Apr 2026, 12:24 | 648 | 648 µS/cm |
| 5 Mar 2026, 13:11 | 592 | 592 µS/cm |
| 30 Jan 2026, 10:41 | 518 | 518 µS/cm |
| 5 Dec 2025, 12:46 | 623 | 623 µS/cm |
| 20 Nov 2025, 09:16 | 587 | 587 µS/cm |
| 17 Oct 2025, 12:40 | 767 | 767 µS/cm |
| 17 Sep 2025, 13:26 | 688 | 688 µS/cm |
| 18 Aug 2025, 12:55 | 719 | 719 µS/cm |
| 2 Jul 2025, 08:57 | 715 | 715 µS/cm |
| 13 Jun 2025, 09:10 | 696 | 696 µS/cm |
| 9 May 2025, 09:36 | 667 | 667 µS/cm |
| 3 Apr 2025, 09:37 | 643 | 643 µS/cm |
| 5 Mar 2025, 08:51 | 625 | 625 µS/cm |
| 14 Feb 2025, 09:17 | 605 | 605 µS/cm |
| 9 Jan 2025, 12:48 | 508 | 508 µS/cm |
| 4 Dec 2024, 11:36 | 571 | 571 µS/cm |
| 13 Nov 2024, 12:27 | 667 | 667 µS/cm |
| 3 Oct 2024, 12:17 | 536 | 536 µS/cm |
| 6 Sep 2024, 11:51 | 664 | 664 µS/cm |
| 21 Aug 2024, 14:20 | 678 | 678 µS/cm |
| 15 Jul 2024, 13:28 | 648 | 648 µS/cm |
| 24 Jun 2024, 11:20 | 664 | 664 µS/cm |
| 5 Mar 2024, 14:14 | 559 | 559 µS/cm |
| 5 Feb 2024, 13:58 | 662 | 662 µS/cm |
| 18 Jan 2024, 12:01 | 673 | 673 µS/cm |
| 1 Dec 2023, 13:14 | 661 | 661 µS/cm |
| 3 Nov 2023, 09:48 | 541 | 541 µS/cm |
| 11 Oct 2023, 14:41 | 705 | 705 µS/cm |
Everything measured here
61 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 61 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 33 | Oct 2023 – Sep 2026 | 103.7% 17 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 33 | Oct 2023 – Sep 2026 | 9.75 mg/l 17 Sep 2026 |
| Temperature of Water 0076 | River water | 33 | Oct 2023 – Sep 2026 | 18.2 °C 17 Sep 2026 |
| pH 0061 | River water | 33 | Oct 2023 – Sep 2026 | 8.03 17 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 32 | Oct 2023 – Sep 2026 | 0.12 mg/l 17 Sep 2026 |
| Nitrate as N 0117 | River water | 31 | Oct 2023 – Sep 2026 | 9.44 mg/l 17 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 31 | Oct 2023 – Sep 2026 | 0.17 mg/l 17 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 33 | Oct 2023 – Sep 2026 | 751 µS/cm 17 Sep 2026 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 1 | Aug 2024 – Aug 2024 | below 0.001 µg/l 21 Aug 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 1 | Aug 2024 – Aug 2024 | below 0.001 µg/l 21 Aug 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 1 | Aug 2024 – Aug 2024 | below 0.001 µg/l 21 Aug 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 1 | Aug 2024 – Aug 2024 | below 0.002 µg/l 21 Aug 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 21 Aug 2024 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 1 | Aug 2024 – Aug 2024 | below 0.001 µg/l 21 Aug 2024 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 21 Aug 2024 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 1 | Aug 2024 – Aug 2024 | below 0.004 µg/l 21 Aug 2024 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 1 | Aug 2024 – Aug 2024 | below 0.005 µg/l 21 Aug 2024 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 21 Aug 2024 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 1 | Aug 2024 – Aug 2024 | below 0.001 µg/l 21 Aug 2024 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 1 | Aug 2024 – Aug 2024 | below 0.001 µg/l 21 Aug 2024 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 21 Aug 2024 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 32 | Oct 2023 – Sep 2026 | 210 mg/l 17 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 32 | Oct 2023 – Sep 2026 | 0.00397 mg/l 17 Sep 2026 |
| BOD : 5 Day ATU 0085 | River water | 26 | Oct 2023 – Mar 2026 | 1.5 mg/l 5 Mar 2026 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 1 | Aug 2024 – Aug 2024 | below 0.001 µg/l 21 Aug 2024 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 1 | Aug 2024 – Aug 2024 | below 0.002 µg/l 21 Aug 2024 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 1 | Aug 2024 – Aug 2024 | below 0.002 µg/l 21 Aug 2024 |
| Nitrite as N 0118 | River water | 32 | Oct 2023 – Sep 2026 | 0.058 mg/l 17 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 31 | Oct 2023 – Sep 2026 | 9.5 mg/l 17 Sep 2026 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 21 Aug 2024 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 21 Aug 2024 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 21 Aug 2024 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 21 Aug 2024 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 21 Aug 2024 |
| Perfluorobutanesulfonic acid 2972 | River water | 1 | Aug 2024 – Aug 2024 | 0.0023 µg/l 21 Aug 2024 |
| Perfluorobutanoic acid 2995 | River water | 1 | Aug 2024 – Aug 2024 | 0.0022 µg/l 21 Aug 2024 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 1 | Aug 2024 – Aug 2024 | 0.00057 µg/l 21 Aug 2024 |
| Perfluorodecanesulfonic acid 2969 | River water | 1 | Aug 2024 – Aug 2024 | below 0.002 µg/l 21 Aug 2024 |
| Perfluorodecanoic acid 8892 | River water | 1 | Aug 2024 – Aug 2024 | below 0.002 µg/l 21 Aug 2024 |
| Perfluorododecane sulfonic acid 2968 | River water | 1 | Aug 2024 – Aug 2024 | below 0.005 µg/l 21 Aug 2024 |
| Perfluorododecanoic acid 8894 | River water | 1 | Aug 2024 – Aug 2024 | below 0.002 µg/l 21 Aug 2024 |
| Perfluoroheptanesulfonic acid 2967 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 21 Aug 2024 |
| Perfluoroheptanoic acid 8889 | River water | 1 | Aug 2024 – Aug 2024 | 0.0012 µg/l 21 Aug 2024 |
| Perfluorohexanesulfonamide 2965 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 21 Aug 2024 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 21 Aug 2024 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 1 | Aug 2024 – Aug 2024 | 0.0026 µg/l 21 Aug 2024 |
| Perfluorohexanoic acid 8888 | River water | 1 | Aug 2024 – Aug 2024 | 0.0031 µg/l 21 Aug 2024 |
| Perfluorononanesulfonic acid 2963 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 21 Aug 2024 |
| Perfluorononanoic acid 8891 | River water | 1 | Aug 2024 – Aug 2024 | below 0.001 µg/l 21 Aug 2024 |
| Perfluorooctadecanoic acid 2962 | River water | 1 | Aug 2024 – Aug 2024 | below 0.002 µg/l 21 Aug 2024 |
| Perfluorooctanesulfonamide 2961 | River water | 1 | Aug 2024 – Aug 2024 | below 0.001 µg/l 21 Aug 2024 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 1 | Aug 2024 – Aug 2024 | 0.0015 µg/l 21 Aug 2024 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 1 | Aug 2024 – Aug 2024 | 0.0028 µg/l 21 Aug 2024 |
| Perfluorooctanoic acid 8890 | River water | 1 | Aug 2024 – Aug 2024 | 0.0019 µg/l 21 Aug 2024 |
| Perfluoropentanesulfonic acid 2957 | River water | 1 | Aug 2024 – Aug 2024 | below 0.0005 µg/l 21 Aug 2024 |
| Perfluoropentanoic acid 8887 | River water | 1 | Aug 2024 – Aug 2024 | 0.0041 µg/l 21 Aug 2024 |
| Perfluorotetradecanoic acid 8895 | River water | 1 | Aug 2024 – Aug 2024 | below 0.006 µg/l 21 Aug 2024 |
| Perfluorotridecanoic acid 2955 | River water | 1 | Aug 2024 – Aug 2024 | below 0.005 µg/l 21 Aug 2024 |
| Perfluoroundecane sulfonic acid 2953 | River water | 1 | Aug 2024 – Aug 2024 | below 0.004 µg/l 21 Aug 2024 |
| Perfluoroundecanoic acid 8893 | River water | 1 | Aug 2024 – Aug 2024 | below 0.002 µg/l 21 Aug 2024 |
| Phosphorus, Total as P 0348 | River water | 7 | Aug 2025 – Mar 2026 | 0.078 mg/l 5 Mar 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.