Wraysbury River above Colne
EA name: WRAYSBURY RIVER ABOVE COLNE
Environment Agency sampling point TH-PCNR0100 · 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
- 1 May 2026, 09:475 months ago · time as the Environment Agency records it (UK clock time; the source gives no time zone). Not sampled since, as far as the archive shows: the Environment Agency was asked up to 30 Sep 2026 and had nothing newer.
- Samples banked
- 32 since 19 Oct 2023 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Monitoring (national agency policy)
- Where
- National Grid 503331, 171752As published, to the nearest 1 m. Open in a map
- River, by its own name
- Wraysbury
- River, by the map
- Wraysbury RiverPlaced on the river its name gives, 1 m from the line.
- Next gauge downstream
- Staines On the River Thames · 0.6 km along the river
- Nearest gauge upstream
- Pound Mill, Staines On the Wraysbury River · 0.1 km along the river
- Why it was sampled
- Monitoring (national agency policy) (32 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
90.8%
Sampled 1 May 2026, 5 months ago · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 May 2026, 09:47 | 90.8 | 90.8% |
| 1 Apr 2026, 14:23 | 111.2 | 111.2% |
| 6 Mar 2026, 10:54 | 95.1 | 95.1% |
| 12 Feb 2026, 09:20 | 81.3 | 81.3% |
| 5 Jan 2026, 10:59 | 94.1 | 94.1% |
| 2 Dec 2025, 13:27 | 93.1 | 93.1% |
| 7 Nov 2025, 09:00 | 84.8 | 84.8% |
| 10 Oct 2025, 09:43 | 86.9 | 86.9% |
| 24 Sep 2025, 10:14 | 94.1 | 94.1% |
| 21 Aug 2025, 11:27 | 90.7 | 90.7% |
| 30 Jul 2025, 11:24 | 90.4 | 90.4% |
| 18 Jun 2025, 11:33 | 93 | 93% |
| 7 May 2025, 10:14 | 93.8 | 93.8% |
| 3 Apr 2025, 12:01 | 102 | 102% |
| 11 Mar 2025, 12:16 | 102.2 | 102.2% |
| 20 Feb 2025, 10:57 | 97.5 | 97.5% |
| 23 Jan 2025, 12:24 | 96 | 96% |
| 5 Dec 2024, 12:18 | 95.1 | 95.1% |
| 15 Nov 2024, 09:29 | 88.4 | 88.4% |
| 16 Oct 2024, 14:12 | 88.5 | 88.5% |
| 19 Sep 2024, 10:32 | 90.3 | 90.3% |
| 19 Aug 2024, 13:56 | 98.4 | 98.4% |
| 15 Jul 2024, 11:09 | 92.5 | 92.5% |
| 17 Jun 2024, 12:12 | 96.6 | 96.6% |
| 9 May 2024, 09:25 | 87.3 | 87.3% |
| 16 Apr 2024, 10:43 | 94.3 | 94.3% |
| 19 Mar 2024, 10:54 | 90.2 | 90.2% |
| 20 Feb 2024, 10:48 | 86.4 | 86.4% |
| 18 Jan 2024, 11:39 | 96.3 | 96.3% |
| 12 Dec 2023, 09:46 | 86.5 | 86.5% |
| 21 Nov 2023, 13:29 | 91.2 | 91.2% |
| 19 Oct 2023, 11:20 | 87.5 | 87.5% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.4 mg/l
Sampled 1 May 2026, 5 months ago · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 May 2026, 09:47 | 9.4 | 9.4 mg/l |
| 1 Apr 2026, 14:23 | 12 | 12 mg/l |
| 6 Mar 2026, 10:54 | 10.6 | 10.6 mg/l |
| 12 Feb 2026, 09:20 | 9.2 | 9.2 mg/l |
| 5 Jan 2026, 10:59 | 12.9 | 12.9 mg/l |
| 2 Dec 2025, 13:27 | 10.6 | 10.6 mg/l |
| 7 Nov 2025, 09:00 | 8.85 | 8.85 mg/l |
| 10 Oct 2025, 09:43 | 8.97 | 8.97 mg/l |
| 24 Sep 2025, 10:14 | 9.74 | 9.74 mg/l |
| 21 Aug 2025, 11:27 | 8.78 | 8.78 mg/l |
| 30 Jul 2025, 11:24 | 8.54 | 8.54 mg/l |
| 18 Jun 2025, 11:33 | 8.52 | 8.52 mg/l |
| 7 May 2025, 10:14 | 10.1 | 10.1 mg/l |
| 3 Apr 2025, 12:01 | 10.9 | 10.9 mg/l |
| 11 Mar 2025, 12:16 | 11.5 | 11.5 mg/l |
| 20 Feb 2025, 10:57 | 11.5 | 11.5 mg/l |
| 23 Jan 2025, 12:24 | 11.6 | 11.6 mg/l |
| 5 Dec 2024, 12:18 | 10.7 | 10.7 mg/l |
| 15 Nov 2024, 09:29 | 9.84 | 9.84 mg/l |
| 16 Oct 2024, 14:12 | 9.1 | 9.1 mg/l |
| 19 Sep 2024, 10:32 | 8.81 | 8.81 mg/l |
| 19 Aug 2024, 13:56 | 9.35 | 9.35 mg/l |
| 15 Jul 2024, 11:09 | 8.94 | 8.94 mg/l |
| 17 Jun 2024, 12:12 | 9.47 | 9.47 mg/l |
| 9 May 2024, 09:25 | 8.78 | 8.78 mg/l |
| 16 Apr 2024, 10:43 | 10.2 | 10.2 mg/l |
| 19 Mar 2024, 10:54 | 9.81 | 9.81 mg/l |
| 20 Feb 2024, 10:48 | 9.78 | 9.78 mg/l |
| 18 Jan 2024, 11:39 | 12.7 | 12.7 mg/l |
| 12 Dec 2023, 09:46 | 10 | 10 mg/l |
| 21 Nov 2023, 13:29 | 10.1 | 10.1 mg/l |
| 19 Oct 2023, 11:20 | 9.03 | 9.03 mg/l |
Water temperature
code 0076 · °C
13.7 °C
Sampled 1 May 2026, 5 months ago · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 May 2026, 09:47 | 13.7 | 13.7 °C |
| 1 Apr 2026, 14:23 | 11.7 | 11.7 °C |
| 6 Mar 2026, 10:54 | 10.6 | 10.6 °C |
| 12 Feb 2026, 09:20 | 9.8 | 9.8 °C |
| 5 Jan 2026, 10:59 | 2.2 | 2.2 °C |
| 2 Dec 2025, 13:27 | 9.7 | 9.7 °C |
| 7 Nov 2025, 09:00 | 13.3 | 13.3 °C |
| 10 Oct 2025, 09:43 | 13.8 | 13.8 °C |
| 24 Sep 2025, 10:14 | 13.7 | 13.7 °C |
| 21 Aug 2025, 11:27 | 16.8 | 16.8 °C |
| 30 Jul 2025, 11:24 | 18 | 18 °C |
| 18 Jun 2025, 11:33 | 19.5 | 19.5 °C |
| 7 May 2025, 10:14 | 11.8 | 11.8 °C |
| 3 Apr 2025, 12:01 | 12.3 | 12.3 °C |
| 11 Mar 2025, 12:16 | 10 | 10 °C |
| 20 Feb 2025, 10:57 | 8.1 | 8.1 °C |
| 23 Jan 2025, 12:24 | 7 | 7 °C |
| 5 Dec 2024, 12:18 | 10.1 | 10.1 °C |
| 15 Nov 2024, 09:29 | 10.5 | 10.5 °C |
| 16 Oct 2024, 14:12 | 14 | 14 °C |
| 19 Sep 2024, 10:32 | 16.4 | 16.4 °C |
| 19 Aug 2024, 13:56 | 17.7 | 17.7 °C |
| 15 Jul 2024, 11:09 | 16.9 | 16.9 °C |
| 17 Jun 2024, 12:12 | 16.2 | 16.2 °C |
| 9 May 2024, 09:25 | 15 | 15 °C |
| 16 Apr 2024, 10:43 | 11.7 | 11.7 °C |
| 19 Mar 2024, 10:54 | 11.5 | 11.5 °C |
| 20 Feb 2024, 10:48 | 9.8 | 9.8 °C |
| 18 Jan 2024, 11:39 | 3.8 | 3.8 °C |
| 12 Dec 2023, 09:46 | 8.8 | 8.8 °C |
| 21 Nov 2023, 13:29 | 10.9 | 10.9 °C |
| 19 Oct 2023, 11:20 | 13.8 | 13.8 °C |
pH
code 0061
8.16
Sampled 1 May 2026, 5 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 May 2026, 09:47 | 8.16 | 8.16 |
| 1 Apr 2026, 14:23 | 8.42 | 8.42 |
| 6 Mar 2026, 10:54 | 8.15 | 8.15 |
| 12 Feb 2026, 09:20 | 8.06 | 8.06 |
| 5 Jan 2026, 10:59 | 8.23 | 8.23 |
| 2 Dec 2025, 13:27 | 8.15 | 8.15 |
| 7 Nov 2025, 09:00 | 8.05 | 8.05 |
| 10 Oct 2025, 09:43 | 8.07 | 8.07 |
| 24 Sep 2025, 10:14 | 8.02 | 8.02 |
| 21 Aug 2025, 11:27 | 8.12 | 8.12 |
| 30 Jul 2025, 11:24 | 8.15 | 8.15 |
| 18 Jun 2025, 11:33 | 8.19 | 8.19 |
| 7 May 2025, 10:14 | 8.29 | 8.29 |
| 11 Mar 2025, 12:16 | 8.26 | 8.26 |
| 20 Feb 2025, 10:57 | 8.17 | 8.17 |
| 23 Jan 2025, 12:24 | 8.21 | 8.21 |
| 5 Dec 2024, 12:18 | 8.06 | 8.06 |
| 15 Nov 2024, 09:29 | 8.13 | 8.13 |
| 16 Oct 2024, 14:12 | 7.98 | 7.98 |
| 19 Sep 2024, 10:32 | 8.02 | 8.02 |
| 19 Aug 2024, 13:56 | 8.15 | 8.15 |
| 15 Jul 2024, 11:09 | 8.18 | 8.18 |
| 17 Jun 2024, 12:12 | 8.11 | 8.11 |
| 9 May 2024, 09:25 | 8.01 | 8.01 |
| 16 Apr 2024, 10:43 | 8.07 | 8.07 |
| 19 Mar 2024, 10:54 | 8 | 8 |
| 20 Feb 2024, 10:48 | 7.99 | 7.99 |
| 18 Jan 2024, 11:39 | 8.29 | 8.29 |
| 12 Dec 2023, 09:46 | 7.98 | 7.98 |
| 21 Nov 2023, 13:29 | 7.91 | 7.91 |
| 19 Oct 2023, 11:20 | 7.96 | 7.96 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.21 mg/l
Sampled 1 May 2026, 5 months ago · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 May 2026, 09:47 | 0.21 | 0.21 mg/l |
| 1 Apr 2026, 14:23 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Mar 2026, 10:54 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Feb 2026, 09:20 | 0.27 | 0.27 mg/l |
| 5 Jan 2026, 10:59 | 0.054 | 0.054 mg/l |
| 2 Dec 2025, 13:27 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Nov 2025, 09:00 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Oct 2025, 09:43 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Sep 2025, 10:14 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Aug 2025, 11:27 | <0.03 | below 0.03 mg/l (not detected above this) |
| 30 Jul 2025, 11:24 | 0.031 | 0.031 mg/l |
| 18 Jun 2025, 11:33 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 May 2025, 10:14 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Apr 2025, 12:01 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Mar 2025, 12:16 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Feb 2025, 10:57 | 0.059 | 0.059 mg/l |
| 23 Jan 2025, 12:24 | 0.039 | 0.039 mg/l |
| 5 Dec 2024, 12:18 | 0.034 | 0.034 mg/l |
| 15 Nov 2024, 09:29 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Oct 2024, 14:12 | 0.041 | 0.041 mg/l |
| 19 Sep 2024, 10:32 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Aug 2024, 13:56 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Jul 2024, 11:09 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Jun 2024, 12:12 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 May 2024, 09:25 | 0.034 | 0.034 mg/l |
| 16 Apr 2024, 10:43 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Mar 2024, 10:54 | 0.064 | 0.064 mg/l |
| 20 Feb 2024, 10:48 | 0.29 | 0.29 mg/l |
| 18 Jan 2024, 11:39 | 0.062 | 0.062 mg/l |
| 12 Dec 2023, 09:46 | 0.083 | 0.083 mg/l |
| 21 Nov 2023, 13:29 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Oct 2023, 11:20 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
12 mg/l
Sampled 1 May 2026, 5 months ago · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 May 2026, 09:47 | 12 | 12 mg/l |
| 1 Apr 2026, 14:23 | 7.39 | 7.39 mg/l |
| 6 Mar 2026, 10:54 | 7.38 | 7.38 mg/l |
| 12 Feb 2026, 09:20 | 6.47 | 6.47 mg/l |
| 5 Jan 2026, 10:59 | 13 | 13 mg/l |
| 2 Dec 2025, 13:27 | 12 | 12 mg/l |
| 7 Nov 2025, 09:00 | 11 | 11 mg/l |
| 10 Oct 2025, 09:43 | 13 | 13 mg/l |
| 24 Sep 2025, 10:14 | 12 | 12 mg/l |
| 21 Aug 2025, 11:27 | 11 | 11 mg/l |
| 30 Jul 2025, 11:24 | 13 | 13 mg/l |
| 18 Jun 2025, 11:33 | 9.69 | 9.69 mg/l |
| 7 May 2025, 10:14 | 9.98 | 9.98 mg/l |
| 3 Apr 2025, 12:01 | 7.79 | 7.79 mg/l |
| 11 Mar 2025, 12:16 | 6.98 | 6.98 mg/l |
| 20 Feb 2025, 10:57 | 8.85 | 8.85 mg/l |
| 23 Jan 2025, 12:24 | 7.96 | 7.96 mg/l |
| 5 Dec 2024, 12:18 | 7.48 | 7.48 mg/l |
| 15 Nov 2024, 09:29 | 12 | 12 mg/l |
| 16 Oct 2024, 14:12 | 6.08 | 6.08 mg/l |
| 19 Sep 2024, 10:32 | 11 | 11 mg/l |
| 19 Aug 2024, 13:56 | 9.79 | 9.79 mg/l |
| 15 Jul 2024, 11:09 | 6.59 | 6.59 mg/l |
| 17 Jun 2024, 12:12 | 6.39 | 6.39 mg/l |
| 9 May 2024, 09:25 | 5.37 | 5.37 mg/l |
| 16 Apr 2024, 10:43 | 6.08 | 6.08 mg/l |
| 19 Mar 2024, 10:54 | 5.32 | 5.32 mg/l |
| 20 Feb 2024, 10:48 | 5.26 | 5.26 mg/l |
| 18 Jan 2024, 11:39 | 7.45 | 7.45 mg/l |
| 12 Dec 2023, 09:46 | 6.07 | 6.07 mg/l |
| 21 Nov 2023, 13:29 | 7.98 | 7.98 mg/l |
| 19 Oct 2023, 11:20 | 12 | 12 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.28 mg/l
Sampled 1 May 2026, 5 months ago · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 May 2026, 09:47 | 0.28 | 0.28 mg/l |
| 1 Apr 2026, 14:23 | 0.11 | 0.11 mg/l |
| 6 Mar 2026, 10:54 | 0.19 | 0.19 mg/l |
| 12 Feb 2026, 09:20 | 0.23 | 0.23 mg/l |
| 5 Jan 2026, 10:59 | 0.24 | 0.24 mg/l |
| 2 Dec 2025, 13:27 | 0.26 | 0.26 mg/l |
| 7 Nov 2025, 09:00 | 0.3 | 0.3 mg/l |
| 10 Oct 2025, 09:43 | 0.33 | 0.33 mg/l |
| 24 Sep 2025, 10:14 | 0.22 | 0.22 mg/l |
| 21 Aug 2025, 11:27 | 0.37 | 0.37 mg/l |
| 30 Jul 2025, 11:24 | 0.34 | 0.34 mg/l |
| 18 Jun 2025, 11:33 | 0.31 | 0.31 mg/l |
| 7 May 2025, 10:14 | 0.2 | 0.2 mg/l |
| 3 Apr 2025, 12:01 | 0.092 | 0.092 mg/l |
| 11 Mar 2025, 12:16 | 0.21 | 0.21 mg/l |
| 20 Feb 2025, 10:57 | 0.15 | 0.15 mg/l |
| 23 Jan 2025, 12:24 | 0.25 | 0.25 mg/l |
| 5 Dec 2024, 12:18 | 0.28 | 0.28 mg/l |
| 15 Nov 2024, 09:29 | 0.31 | 0.31 mg/l |
| 16 Oct 2024, 14:12 | 0.27 | 0.27 mg/l |
| 19 Sep 2024, 10:32 | 0.34 | 0.34 mg/l |
| 19 Aug 2024, 13:56 | 0.29 | 0.29 mg/l |
| 15 Jul 2024, 11:09 | 0.26 | 0.26 mg/l |
| 17 Jun 2024, 12:12 | 0.24 | 0.24 mg/l |
| 9 May 2024, 09:25 | 0.2 | 0.2 mg/l |
| 16 Apr 2024, 10:43 | 0.2 | 0.2 mg/l |
| 19 Mar 2024, 10:54 | 0.22 | 0.22 mg/l |
| 20 Feb 2024, 10:48 | 0.22 | 0.22 mg/l |
| 18 Jan 2024, 11:39 | 0.23 | 0.23 mg/l |
| 12 Dec 2023, 09:46 | 0.24 | 0.24 mg/l |
| 21 Nov 2023, 13:29 | 0.25 | 0.25 mg/l |
| 19 Oct 2023, 11:20 | 0.3 | 0.3 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
812 µS/cm
Sampled 1 May 2026, 5 months ago · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 May 2026, 09:47 | 812 | 812 µS/cm |
| 1 Apr 2026, 14:23 | 771 | 771 µS/cm |
| 6 Mar 2026, 10:54 | 784 | 784 µS/cm |
| 12 Feb 2026, 09:20 | 696 | 696 µS/cm |
| 5 Jan 2026, 10:59 | 878 | 878 µS/cm |
| 2 Dec 2025, 13:27 | 838 | 838 µS/cm |
| 7 Nov 2025, 09:00 | 857 | 857 µS/cm |
| 10 Oct 2025, 09:43 | 848 | 848 µS/cm |
| 24 Sep 2025, 10:14 | 857 | 857 µS/cm |
| 21 Aug 2025, 11:27 | 840 | 840 µS/cm |
| 30 Jul 2025, 11:24 | 840 | 840 µS/cm |
| 18 Jun 2025, 11:33 | 811 | 811 µS/cm |
| 7 May 2025, 10:14 | 776 | 776 µS/cm |
| 3 Apr 2025, 12:01 | 774 | 774 µS/cm |
| 11 Mar 2025, 12:16 | 762 | 762 µS/cm |
| 20 Feb 2025, 10:57 | 774 | 774 µS/cm |
| 23 Jan 2025, 12:24 | 767 | 767 µS/cm |
| 5 Dec 2024, 12:18 | 773 | 773 µS/cm |
| 15 Nov 2024, 09:29 | 784 | 784 µS/cm |
| 16 Oct 2024, 14:12 | 699 | 699 µS/cm |
| 19 Sep 2024, 10:32 | 824 | 824 µS/cm |
| 19 Aug 2024, 13:56 | 777 | 777 µS/cm |
| 15 Jul 2024, 11:09 | 741 | 741 µS/cm |
| 17 Jun 2024, 12:12 | 716 | 716 µS/cm |
| 9 May 2024, 09:25 | 676 | 676 µS/cm |
| 16 Apr 2024, 10:43 | 728 | 728 µS/cm |
| 19 Mar 2024, 10:54 | 708 | 708 µS/cm |
| 20 Feb 2024, 10:48 | 656 | 656 µS/cm |
| 18 Jan 2024, 11:39 | 772 | 772 µS/cm |
| 12 Dec 2023, 09:46 | 726 | 726 µS/cm |
| 21 Nov 2023, 13:29 | 779 | 779 µS/cm |
| 19 Oct 2023, 11:20 | 779 | 779 µS/cm |
Everything measured here
75 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 75 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 32 | Oct 2023 – May 2026 | 90.8% 1 May 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 32 | Oct 2023 – May 2026 | 9.4 mg/l 1 May 2026 |
| Temperature of Water 0076 | River water | 32 | Oct 2023 – May 2026 | 13.7 °C 1 May 2026 |
| pH 0061 | River water | 31 | Oct 2023 – May 2026 | 8.16 1 May 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 32 | Oct 2023 – May 2026 | 0.21 mg/l 1 May 2026 |
| Nitrate as N 0117 | River water | 32 | Oct 2023 – May 2026 | 12 mg/l 1 May 2026 |
| Orthophosphate, reactive as P 0180 | River water | 32 | Oct 2023 – May 2026 | 0.28 mg/l 1 May 2026 |
| Conductivity at 25 C 0077 | River water | 32 | Oct 2023 – May 2026 | 812 µS/cm 1 May 2026 |
| 10:2 Fluorotelomer sulfonic acid 2994 | River water | 1 | Feb 2026 – Feb 2026 | below 0.002 µg/l 12 Feb 2026 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 4 | Jun 2024 – Feb 2026 | below 0.001 µg/l 12 Feb 2026 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 4 | Jun 2024 – Feb 2026 | below 0.001 µg/l 12 Feb 2026 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 4 | Jun 2024 – Feb 2026 | below 0.001 µg/l 12 Feb 2026 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 4 | Jun 2024 – Feb 2026 | below 0.0005 µg/l 12 Feb 2026 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 4 | Jun 2024 – Feb 2026 | below 0.0005 µg/l 12 Feb 2026 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 4 | Jun 2024 – Feb 2026 | below 0.001 µg/l 12 Feb 2026 |
| 2H-Perfluoro-2-decenoic acid 2888 | River water | 1 | Feb 2026 – Feb 2026 | below 0.001 µg/l 12 Feb 2026 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 4 | Jun 2024 – Feb 2026 | below 0.0005 µg/l 12 Feb 2026 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 4 | Jun 2024 – Feb 2026 | below 0.004 µg/l 12 Feb 2026 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 4 | Jun 2024 – Feb 2026 | below 0.001 µg/l 12 Feb 2026 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 3 | Jun 2024 – Feb 2026 | below 0.0005 µg/l 12 Feb 2026 |
| 5:1:2 Fluorotelomer betaine 2887 | River water | 1 | Feb 2026 – Feb 2026 | below 0.0005 µg/l 12 Feb 2026 |
| 5:3 Fluorotelomer betaine 2886 | River water | 1 | Feb 2026 – Feb 2026 | below 0.0005 µg/l 12 Feb 2026 |
| 6:2 Fluorotelomer phosphate diester 2986 | River water | 1 | Feb 2026 – Feb 2026 | below 0.004 µg/l 12 Feb 2026 |
| 6:2 Fluorotelomer sulfonamide amine oxide (6:2 FTNO) (Capstone A) 2841 | River water | 1 | Feb 2026 – Feb 2026 | below 0.001 µg/l 12 Feb 2026 |
| 6:2 Fluorotelomer sulfonamide betaine 2985 | River water | 1 | Feb 2026 – Feb 2026 | 0.0033 µg/l 12 Feb 2026 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 4 | Jun 2024 – Feb 2026 | below 0.001 µg/l 12 Feb 2026 |
| 6:2/8:2 Fluorotelomer phosphate diester 2884 | River water | 1 | Feb 2026 – Feb 2026 | below 0.01 µg/l 12 Feb 2026 |
| 6:6 Perfluorophosphinic acid 2883 | River water | 1 | Feb 2026 – Feb 2026 | below 0.004 µg/l 12 Feb 2026 |
| 6:8 Perfluorophosphinic acid 2882 | River water | 1 | Feb 2026 – Feb 2026 | below 0.01 µg/l 12 Feb 2026 |
| 8:2 Fluorotelomer phosphate diester 2880 | River water | 1 | Feb 2026 – Feb 2026 | below 0.004 µg/l 12 Feb 2026 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 4 | Jun 2024 – Feb 2026 | below 0.001 µg/l 12 Feb 2026 |
| 8:8 Perfluorophosphinic acid 2879 | River water | 1 | Feb 2026 – Feb 2026 | below 0.01 µg/l 12 Feb 2026 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 4 | Jun 2024 – Feb 2026 | below 0.0005 µg/l 12 Feb 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 32 | Oct 2023 – May 2026 | 240 mg/l 1 May 2026 |
| Ammonia un-ionised as N 0119 | River water | 31 | Oct 2023 – May 2026 | 0.00502 mg/l 1 May 2026 |
| BOD : 5 Day ATU 0085 | River water | 28 | Feb 2024 – May 2026 | 1.4 mg/l 1 May 2026 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 4 | Jun 2024 – Feb 2026 | below 0.001 µg/l 12 Feb 2026 |
| Hexafluoropropylene oxide trimer acid 2980 | River water | 1 | Feb 2026 – Feb 2026 | below 0.001 µg/l 12 Feb 2026 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 4 | Jun 2024 – Feb 2026 | below 0.002 µg/l 12 Feb 2026 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 4 | Jun 2024 – Feb 2026 | below 0.002 µg/l 12 Feb 2026 |
| Nitrite as N 0118 | River water | 32 | Oct 2023 – May 2026 | 0.024 mg/l 1 May 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 32 | Oct 2023 – May 2026 | 12 mg/l 1 May 2026 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 4 | Jun 2024 – Feb 2026 | below 0.0005 µg/l 12 Feb 2026 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 4 | Jun 2024 – Feb 2026 | below 0.0005 µg/l 12 Feb 2026 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 4 | Jun 2024 – Feb 2026 | below 0.0005 µg/l 12 Feb 2026 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 4 | Jun 2024 – Feb 2026 | below 0.0005 µg/l 12 Feb 2026 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 4 | Jun 2024 – Feb 2026 | 0.00057 µg/l 12 Feb 2026 |
| Perfluorobutanesulfonic acid 2972 | River water | 4 | Jun 2024 – Feb 2026 | 0.0042 µg/l 12 Feb 2026 |
| Perfluorobutanoic acid 2995 | River water | 4 | Jun 2024 – Feb 2026 | 0.0051 µg/l 12 Feb 2026 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 3 | Jun 2024 – Feb 2026 | 0.00056 µg/l 12 Feb 2026 |
| Perfluorodecanesulfonic acid 2969 | River water | 4 | Jun 2024 – Feb 2026 | below 0.001 µg/l 12 Feb 2026 |
| Perfluorodecanoic acid 8892 | River water | 4 | Jun 2024 – Feb 2026 | below 0.001 µg/l 12 Feb 2026 |
| Perfluorododecane sulfonic acid 2968 | River water | 4 | Jun 2024 – Feb 2026 | below 0.005 µg/l 12 Feb 2026 |
| Perfluorododecanoic acid 8894 | River water | 4 | Jun 2024 – Feb 2026 | below 0.002 µg/l 12 Feb 2026 |
| Perfluoroheptanesulfonic acid 2967 | River water | 4 | Jun 2024 – Feb 2026 | below 0.0005 µg/l 12 Feb 2026 |
| Perfluoroheptanoic acid 8889 | River water | 4 | Jun 2024 – Feb 2026 | 0.002 µg/l 12 Feb 2026 |
| Perfluorohexane sulfonamido amine 2874 | River water | 1 | Feb 2026 – Feb 2026 | below 0.0005 µg/l 12 Feb 2026 |
| Perfluorohexanesulfonamide 2965 | River water | 4 | Jun 2024 – Feb 2026 | below 0.0005 µg/l 12 Feb 2026 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 4 | Jun 2024 – Feb 2026 | 0.00066 µg/l 12 Feb 2026 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 4 | Jun 2024 – Feb 2026 | 0.0028 µg/l 12 Feb 2026 |
| Perfluorohexanoic acid 8888 | River water | 4 | Jun 2024 – Feb 2026 | 0.0047 µg/l 12 Feb 2026 |
| Perfluorononanesulfonic acid 2963 | River water | 4 | Jun 2024 – Feb 2026 | below 0.0005 µg/l 12 Feb 2026 |
| Perfluorononanoic acid 8891 | River water | 4 | Jun 2024 – Feb 2026 | below 0.001 µg/l 12 Feb 2026 |
| Perfluorooctadecanoic acid 2962 | River water | 4 | Jun 2024 – Feb 2026 | below 0.002 µg/l 12 Feb 2026 |
| Perfluorooctanesulfonamide 2961 | River water | 4 | Jun 2024 – Feb 2026 | below 0.001 µg/l 12 Feb 2026 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 4 | Jun 2024 – Feb 2026 | 0.0038 µg/l 12 Feb 2026 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 4 | Jun 2024 – Feb 2026 | 0.0042 µg/l 12 Feb 2026 |
| Perfluorooctanesulfonic acid (total) 2958 | River water | 1 | Feb 2026 – Feb 2026 | 0.0081 µg/l 12 Feb 2026 |
| Perfluorooctanoic acid 8890 | River water | 4 | Jun 2024 – Feb 2026 | 0.0048 µg/l 12 Feb 2026 |
| Perfluoropentanesulfonic acid 2957 | River water | 4 | Jun 2024 – Feb 2026 | below 0.0005 µg/l 12 Feb 2026 |
| Perfluoropentanoic acid 8887 | River water | 4 | Jun 2024 – Feb 2026 | 0.0057 µg/l 12 Feb 2026 |
| Perfluorotetradecanoic acid 8895 | River water | 4 | Jun 2024 – Feb 2026 | below 0.006 µg/l 12 Feb 2026 |
| Perfluorotridecanoic acid 2955 | River water | 4 | Jun 2024 – Feb 2026 | below 0.002 µg/l 12 Feb 2026 |
| Perfluoroundecane sulfonic acid 2953 | River water | 4 | Jun 2024 – Feb 2026 | below 0.004 µg/l 12 Feb 2026 |
| Perfluoroundecanoic acid 8893 | River water | 4 | Jun 2024 – Feb 2026 | below 0.001 µg/l 12 Feb 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.