Chess above Colne
EA name: CHESS ABOVE COLNE
Environment Agency sampling point TH-PCNR0013 · 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
- 14 Aug 2026, 09:1248 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 33 since 4 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 506624, 194687As published, to the nearest 1 m. Open in a map
- River, by its own name
- Chess
- River, by the map
- River ChessPlaced on the river its name gives, 3 m from the line.
- Next gauge downstream
- Denham Colne On the River Colne · 12 km along the river (the path rests on a repair to the map)
- Nearest gauge upstream
- Rickmansworth On the River Chess · 0.1 km along the river
- Why it was sampled
- Environmental monitoring statutory (EU directives) (33 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
92.1%
Sampled 14 Aug 2026, 48 days ago · 33 results banked
Every result (33)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 09:12 | 92.1 | 92.1% |
| 21 Jul 2026, 11:45 | 103.8 | 103.8% |
| 10 Jun 2026, 11:41 | 102.6 | 102.6% |
| 21 May 2026, 09:16 | 92.7 | 92.7% |
| 1 Apr 2026, 10:22 | 100.7 | 100.7% |
| 3 Mar 2026, 10:52 | 103.1 | 103.1% |
| 6 Feb 2026, 12:30 | 99.5 | 99.5% |
| 7 Jan 2026, 11:10 | 100.4 | 100.4% |
| 3 Dec 2025, 13:21 | 98.9 | 98.9% |
| 4 Nov 2025, 09:32 | 98.2 | 98.2% |
| 17 Oct 2025, 09:45 | 97.7 | 97.7% |
| 1 Sep 2025, 11:55 | 102.4 | 102.4% |
| 1 Aug 2025, 10:20 | 100.8 | 100.8% |
| 1 Jul 2025, 14:22 | 111.4 | 111.4% |
| 16 Jun 2025, 09:15 | 99.2 | 99.2% |
| 22 May 2025, 12:05 | 103.1 | 103.1% |
| 8 Apr 2025, 13:16 | 106.6 | 106.6% |
| 5 Mar 2025, 12:23 | 102.7 | 102.7% |
| 12 Feb 2025, 11:15 | 101.1 | 101.1% |
| 7 Jan 2025, 09:44 | 100.7 | 100.7% |
| 2 Dec 2024, 14:32 | 98.1 | 98.1% |
| 6 Nov 2024, 10:22 | 98.2 | 98.2% |
| 2 Oct 2024, 09:54 | 96.1 | 96.1% |
| 3 Sep 2024, 11:34 | 97.9 | 97.9% |
| 6 Aug 2024, 10:52 | 94.4 | 94.4% |
| 2 Jul 2024, 11:51 | 99.8 | 99.8% |
| 5 Jun 2024, 11:07 | 100.6 | 100.6% |
| 5 Mar 2024, 12:50 | 98.8 | 98.8% |
| 7 Feb 2024, 12:54 | 97.8 | 97.8% |
| 3 Jan 2024, 13:19 | 96.7 | 96.7% |
| 7 Dec 2023, 14:02 | 97.8 | 97.8% |
| 13 Nov 2023, 12:42 | 96.9 | 96.9% |
| 4 Oct 2023, 13:25 | 99 | 99% |
Dissolved oxygen
as O2 · code 9924 · mg/l
8.61 mg/l
Sampled 14 Aug 2026, 48 days ago · 33 results banked
Every result (33)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 09:12 | 8.61 | 8.61 mg/l |
| 21 Jul 2026, 11:45 | 9.94 | 9.94 mg/l |
| 10 Jun 2026, 11:41 | 10.6 | 10.6 mg/l |
| 21 May 2026, 09:16 | 9.81 | 9.81 mg/l |
| 1 Apr 2026, 10:22 | 11.3 | 11.3 mg/l |
| 3 Mar 2026, 10:52 | 11.8 | 11.8 mg/l |
| 6 Feb 2026, 12:30 | 11.5 | 11.5 mg/l |
| 7 Jan 2026, 11:10 | 13.2 | 13.2 mg/l |
| 3 Dec 2025, 13:21 | 11.8 | 11.8 mg/l |
| 4 Nov 2025, 09:32 | 10.4 | 10.4 mg/l |
| 17 Oct 2025, 09:45 | 10.4 | 10.4 mg/l |
| 1 Sep 2025, 11:55 | 10.2 | 10.2 mg/l |
| 1 Aug 2025, 10:20 | 9.97 | 9.97 mg/l |
| 1 Jul 2025, 14:22 | 9.57 | 9.57 mg/l |
| 16 Jun 2025, 09:15 | 9.87 | 9.87 mg/l |
| 22 May 2025, 12:05 | 10.9 | 10.9 mg/l |
| 8 Apr 2025, 13:16 | 11.7 | 11.7 mg/l |
| 5 Mar 2025, 12:23 | 12.5 | 12.5 mg/l |
| 12 Feb 2025, 11:15 | 12.2 | 12.2 mg/l |
| 7 Jan 2025, 09:44 | 12.6 | 12.6 mg/l |
| 2 Dec 2024, 14:32 | 11.1 | 11.1 mg/l |
| 6 Nov 2024, 10:22 | 10.8 | 10.8 mg/l |
| 2 Oct 2024, 09:54 | 10.1 | 10.1 mg/l |
| 3 Sep 2024, 11:34 | 9.6 | 9.6 mg/l |
| 6 Aug 2024, 10:52 | 9.16 | 9.16 mg/l |
| 2 Jul 2024, 11:51 | 10.2 | 10.2 mg/l |
| 5 Jun 2024, 11:07 | 10.6 | 10.6 mg/l |
| 5 Mar 2024, 12:50 | 11.4 | 11.4 mg/l |
| 7 Feb 2024, 12:54 | 11.3 | 11.3 mg/l |
| 3 Jan 2024, 13:19 | 11 | 11 mg/l |
| 7 Dec 2023, 14:02 | 11.7 | 11.7 mg/l |
| 13 Nov 2023, 12:42 | 10.8 | 10.8 mg/l |
| 4 Oct 2023, 13:25 | 10.2 | 10.2 mg/l |
Water temperature
code 0076 · °C
18.5 °C
Sampled 14 Aug 2026, 48 days ago · 33 results banked
Every result (33)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 09:12 | 18.5 | 18.5 °C |
| 21 Jul 2026, 11:45 | 17.3 | 17.3 °C |
| 10 Jun 2026, 11:41 | 13.7 | 13.7 °C |
| 21 May 2026, 09:16 | 12.7 | 12.7 °C |
| 1 Apr 2026, 10:22 | 10 | 10 °C |
| 3 Mar 2026, 10:52 | 9.2 | 9.2 °C |
| 6 Feb 2026, 12:30 | 9.1 | 9.1 °C |
| 7 Jan 2026, 11:10 | 3.8 | 3.8 °C |
| 3 Dec 2025, 13:21 | 7.5 | 7.5 °C |
| 4 Nov 2025, 09:32 | 12.5 | 12.5 °C |
| 17 Oct 2025, 09:45 | 12.3 | 12.3 °C |
| 1 Sep 2025, 11:55 | 15.5 | 15.5 °C |
| 1 Aug 2025, 10:20 | 15.8 | 15.8 °C |
| 1 Jul 2025, 14:22 | 22.8 | 22.8 °C |
| 16 Jun 2025, 09:15 | 15.5 | 15.5 °C |
| 22 May 2025, 12:05 | 12.6 | 12.6 °C |
| 8 Apr 2025, 13:16 | 11.1 | 11.1 °C |
| 5 Mar 2025, 12:23 | 6.9 | 6.9 °C |
| 12 Feb 2025, 11:15 | 7.1 | 7.1 °C |
| 7 Jan 2025, 09:44 | 5.6 | 5.6 °C |
| 2 Dec 2024, 14:32 | 9.7 | 9.7 °C |
| 6 Nov 2024, 10:22 | 11 | 11 °C |
| 2 Oct 2024, 09:54 | 13 | 13 °C |
| 3 Sep 2024, 11:34 | 16.2 | 16.2 °C |
| 6 Aug 2024, 10:52 | 16.7 | 16.7 °C |
| 2 Jul 2024, 11:51 | 14.4 | 14.4 °C |
| 5 Jun 2024, 11:07 | 13 | 13 °C |
| 5 Mar 2024, 12:50 | 9 | 9 °C |
| 7 Feb 2024, 12:54 | 8.8 | 8.8 °C |
| 3 Jan 2024, 13:19 | 9.5 | 9.5 °C |
| 7 Dec 2023, 14:02 | 7.5 | 7.5 °C |
| 13 Nov 2023, 12:42 | 10.6 | 10.6 °C |
| 4 Oct 2023, 13:25 | 13.9 | 13.9 °C |
pH
code 0061
8.19
Sampled 14 Aug 2026, 48 days ago · 33 results banked
Every result (33)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 09:12 | 8.19 | 8.19 |
| 21 Jul 2026, 11:45 | 8.17 | 8.17 |
| 10 Jun 2026, 11:41 | 8.27 | 8.27 |
| 21 May 2026, 09:16 | 8.39 | 8.39 |
| 1 Apr 2026, 10:22 | 8.28 | 8.28 |
| 3 Mar 2026, 10:52 | 8.57 | 8.57 |
| 6 Feb 2026, 12:30 | 8.21 | 8.21 |
| 7 Jan 2026, 11:10 | 8.34 | 8.34 |
| 3 Dec 2025, 13:21 | 8.28 | 8.28 |
| 4 Nov 2025, 09:32 | 8.18 | 8.18 |
| 17 Oct 2025, 09:45 | 8.19 | 8.19 |
| 1 Sep 2025, 11:55 | 8.35 | 8.35 |
| 1 Aug 2025, 10:20 | 8.24 | 8.24 |
| 1 Jul 2025, 14:22 | 8.25 | 8.25 |
| 16 Jun 2025, 09:15 | 8.22 | 8.22 |
| 22 May 2025, 12:05 | 8.18 | 8.18 |
| 8 Apr 2025, 13:16 | 8.33 | 8.33 |
| 5 Mar 2025, 12:23 | 8.27 | 8.27 |
| 12 Feb 2025, 11:15 | 8.24 | 8.24 |
| 7 Jan 2025, 09:44 | 8.29 | 8.29 |
| 2 Dec 2024, 14:32 | 8.19 | 8.19 |
| 6 Nov 2024, 10:22 | 7.94 | 7.94 |
| 2 Oct 2024, 09:54 | 8.04 | 8.04 |
| 3 Sep 2024, 11:34 | 8.12 | 8.12 |
| 6 Aug 2024, 10:52 | 8.07 | 8.07 |
| 2 Jul 2024, 11:51 | 8.15 | 8.15 |
| 5 Jun 2024, 11:07 | 8.13 | 8.13 |
| 5 Mar 2024, 12:50 | 8.03 | 8.03 |
| 7 Feb 2024, 12:54 | 8.24 | 8.24 |
| 3 Jan 2024, 13:19 | 8.11 | 8.11 |
| 7 Dec 2023, 14:02 | 8.19 | 8.19 |
| 13 Nov 2023, 12:42 | 8.01 | 8.01 |
| 4 Oct 2023, 13:25 | 8.24 | 8.24 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 14 Aug 2026, 48 days ago · 33 results banked
Every result (33)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 09:12 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Jul 2026, 11:45 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Jun 2026, 11:41 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 May 2026, 09:16 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Apr 2026, 10:22 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Mar 2026, 10:52 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Feb 2026, 12:30 | 0.053 | 0.053 mg/l |
| 7 Jan 2026, 11:10 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Dec 2025, 13:21 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Nov 2025, 09:32 | 0.032 | 0.032 mg/l |
| 17 Oct 2025, 09:45 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Sep 2025, 11:55 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Aug 2025, 10:20 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Jul 2025, 14:22 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Jun 2025, 09:15 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 May 2025, 12:05 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Apr 2025, 13:16 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Mar 2025, 12:23 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Feb 2025, 11:15 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Jan 2025, 09:44 | 0.067 | 0.067 mg/l |
| 2 Dec 2024, 14:32 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Nov 2024, 10:22 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Oct 2024, 09:54 | 0.16 | 0.16 mg/l |
| 3 Sep 2024, 11:34 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Aug 2024, 10:52 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Jul 2024, 11:51 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Jun 2024, 11:07 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Mar 2024, 12:50 | 0.036 | 0.036 mg/l |
| 7 Feb 2024, 12:54 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Jan 2024, 13:19 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Dec 2023, 14:02 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Nov 2023, 12:42 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Oct 2023, 13:25 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
4.79 mg/l
Sampled 14 Aug 2026, 48 days ago · 33 results banked
Every result (33)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 09:12 | 4.79 | 4.79 mg/l |
| 21 Jul 2026, 11:45 | 5 | 5 mg/l |
| 10 Jun 2026, 11:41 | 6.19 | 6.19 mg/l |
| 21 May 2026, 09:16 | 6.69 | 6.69 mg/l |
| 1 Apr 2026, 10:22 | 6 | 6 mg/l |
| 3 Mar 2026, 10:52 | 5.79 | 5.79 mg/l |
| 6 Feb 2026, 12:30 | 6.55 | 6.55 mg/l |
| 7 Jan 2026, 11:10 | 8.59 | 8.59 mg/l |
| 3 Dec 2025, 13:21 | 6.79 | 6.79 mg/l |
| 4 Nov 2025, 09:32 | 7.98 | 7.98 mg/l |
| 17 Oct 2025, 09:45 | 7.79 | 7.79 mg/l |
| 1 Sep 2025, 11:55 | 6.99 | 6.99 mg/l |
| 1 Aug 2025, 10:20 | 7.39 | 7.39 mg/l |
| 1 Jul 2025, 14:22 | 6.79 | 6.79 mg/l |
| 16 Jun 2025, 09:15 | 7.29 | 7.29 mg/l |
| 22 May 2025, 12:05 | 7.19 | 7.19 mg/l |
| 8 Apr 2025, 13:16 | 6.79 | 6.79 mg/l |
| 5 Mar 2025, 12:23 | 6.98 | 6.98 mg/l |
| 12 Feb 2025, 11:15 | 7.28 | 7.28 mg/l |
| 7 Jan 2025, 09:44 | 6.48 | 6.48 mg/l |
| 2 Dec 2024, 14:32 | 7.08 | 7.08 mg/l |
| 6 Nov 2024, 10:22 | 6.88 | 6.88 mg/l |
| 2 Oct 2024, 09:54 | 4.96 | 4.96 mg/l |
| 3 Sep 2024, 11:34 | 5.78 | 5.78 mg/l |
| 6 Aug 2024, 10:52 | 5.49 | 5.49 mg/l |
| 2 Jul 2024, 11:51 | 5.59 | 5.59 mg/l |
| 5 Jun 2024, 11:07 | 5.36 | 5.36 mg/l |
| 5 Mar 2024, 12:50 | 6.34 | 6.34 mg/l |
| 7 Feb 2024, 12:54 | 6.47 | 6.47 mg/l |
| 3 Jan 2024, 13:19 | 5.48 | 5.48 mg/l |
| 7 Dec 2023, 14:02 | 7.79 | 7.79 mg/l |
| 13 Nov 2023, 12:42 | 7.28 | 7.28 mg/l |
| 4 Oct 2023, 13:25 | 6.89 | 6.89 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.053 mg/l
Sampled 14 Aug 2026, 48 days ago · 33 results banked
Every result (33)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 09:12 | 0.053 | 0.053 mg/l |
| 21 Jul 2026, 11:45 | 0.035 | 0.035 mg/l |
| 10 Jun 2026, 11:41 | 0.087 | 0.087 mg/l |
| 21 May 2026, 09:16 | 0.074 | 0.074 mg/l |
| 1 Apr 2026, 10:22 | 0.051 | 0.051 mg/l |
| 3 Mar 2026, 10:52 | 0.13 | 0.13 mg/l |
| 6 Feb 2026, 12:30 | 0.061 | 0.061 mg/l |
| 7 Jan 2026, 11:10 | 0.053 | 0.053 mg/l |
| 3 Dec 2025, 13:21 | 0.049 | 0.049 mg/l |
| 4 Nov 2025, 09:32 | 0.048 | 0.048 mg/l |
| 17 Oct 2025, 09:45 | 0.05 | 0.05 mg/l |
| 1 Sep 2025, 11:55 | 0.041 | 0.041 mg/l |
| 1 Aug 2025, 10:20 | 0.045 | 0.045 mg/l |
| 1 Jul 2025, 14:22 | 0.065 | 0.065 mg/l |
| 16 Jun 2025, 09:15 | 0.056 | 0.056 mg/l |
| 22 May 2025, 12:05 | 0.058 | 0.058 mg/l |
| 8 Apr 2025, 13:16 | 0.037 | 0.037 mg/l |
| 5 Mar 2025, 12:23 | 0.043 | 0.043 mg/l |
| 12 Feb 2025, 11:15 | 0.072 | 0.072 mg/l |
| 7 Jan 2025, 09:44 | 0.082 | 0.082 mg/l |
| 2 Dec 2024, 14:32 | 0.22 | 0.22 mg/l |
| 6 Nov 2024, 10:22 | 0.23 | 0.23 mg/l |
| 2 Oct 2024, 09:54 | 0.22 | 0.22 mg/l |
| 3 Sep 2024, 11:34 | 0.2 | 0.2 mg/l |
| 6 Aug 2024, 10:52 | 0.15 | 0.15 mg/l |
| 2 Jul 2024, 11:51 | 0.06 | 0.06 mg/l |
| 5 Jun 2024, 11:07 | 0.1 | 0.1 mg/l |
| 5 Mar 2024, 12:50 | 0.14 | 0.14 mg/l |
| 7 Feb 2024, 12:54 | 0.18 | 0.18 mg/l |
| 3 Jan 2024, 13:19 | 0.21 | 0.21 mg/l |
| 7 Dec 2023, 14:02 | 0.22 | 0.22 mg/l |
| 13 Nov 2023, 12:42 | 0.23 | 0.23 mg/l |
| 4 Oct 2023, 13:25 | 0.26 | 0.26 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
626 µS/cm
Sampled 14 Aug 2026, 48 days ago · 33 results banked
Every result (33)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 09:12 | 626 | 626 µS/cm |
| 21 Jul 2026, 11:45 | 602 | 602 µS/cm |
| 10 Jun 2026, 11:41 | 609 | 609 µS/cm |
| 21 May 2026, 09:16 | 688 | 688 µS/cm |
| 1 Apr 2026, 10:22 | 620 | 620 µS/cm |
| 3 Mar 2026, 10:52 | 637 | 637 µS/cm |
| 6 Feb 2026, 12:30 | 583 | 583 µS/cm |
| 7 Jan 2026, 11:10 | 675 | 675 µS/cm |
| 3 Dec 2025, 13:21 | 648 | 648 µS/cm |
| 4 Nov 2025, 09:32 | 675 | 675 µS/cm |
| 17 Oct 2025, 09:45 | 658 | 658 µS/cm |
| 1 Sep 2025, 11:55 | 622 | 622 µS/cm |
| 1 Aug 2025, 10:20 | 721 | 721 µS/cm |
| 1 Jul 2025, 14:22 | 618 | 618 µS/cm |
| 16 Jun 2025, 09:15 | 641 | 641 µS/cm |
| 22 May 2025, 12:05 | 605 | 605 µS/cm |
| 8 Apr 2025, 13:16 | 642 | 642 µS/cm |
| 5 Mar 2025, 12:23 | 625 | 625 µS/cm |
| 12 Feb 2025, 11:15 | 639 | 639 µS/cm |
| 7 Jan 2025, 09:44 | 593 | 593 µS/cm |
| 2 Dec 2024, 14:32 | 629 | 629 µS/cm |
| 6 Nov 2024, 10:22 | 638 | 638 µS/cm |
| 2 Oct 2024, 09:54 | 565 | 565 µS/cm |
| 3 Sep 2024, 11:34 | 618 | 618 µS/cm |
| 6 Aug 2024, 10:52 | 617 | 617 µS/cm |
| 2 Jul 2024, 11:51 | 620 | 620 µS/cm |
| 5 Jun 2024, 11:07 | 638 | 638 µS/cm |
| 5 Mar 2024, 12:50 | 619 | 619 µS/cm |
| 7 Feb 2024, 12:54 | 622 | 622 µS/cm |
| 3 Jan 2024, 13:19 | 578 | 578 µS/cm |
| 7 Dec 2023, 14:02 | 631 | 631 µS/cm |
| 13 Nov 2023, 12:42 | 615 | 615 µS/cm |
| 4 Oct 2023, 13:25 | 629 | 629 µS/cm |
Everything measured here
49 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 49 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 33 | Oct 2023 – Aug 2026 | 92.1% 14 Aug 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 33 | Oct 2023 – Aug 2026 | 8.61 mg/l 14 Aug 2026 |
| Temperature of Water 0076 | River water | 33 | Oct 2023 – Aug 2026 | 18.5 °C 14 Aug 2026 |
| pH 0061 | River water | 33 | Oct 2023 – Aug 2026 | 8.19 14 Aug 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 33 | Oct 2023 – Aug 2026 | below 0.03 mg/l 14 Aug 2026 |
| Nitrate as N 0117 | River water | 33 | Oct 2023 – Aug 2026 | 4.79 mg/l 14 Aug 2026 |
| Orthophosphate, reactive as P 0180 | River water | 33 | Oct 2023 – Aug 2026 | 0.053 mg/l 14 Aug 2026 |
| Conductivity at 25 C 0077 | River water | 33 | Oct 2023 – Aug 2026 | 626 µS/cm 14 Aug 2026 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 1 | Jun 2024 – Jun 2024 | below 0.001 µg/l 5 Jun 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 1 | Jun 2024 – Jun 2024 | below 0.001 µg/l 5 Jun 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 1 | Jun 2024 – Jun 2024 | below 0.001 µg/l 5 Jun 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 1 | Jun 2024 – Jun 2024 | below 0.002 µg/l 5 Jun 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 1 | Jun 2024 – Jun 2024 | below 0.0005 µg/l 5 Jun 2024 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 1 | Jun 2024 – Jun 2024 | below 0.001 µg/l 5 Jun 2024 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 1 | Jun 2024 – Jun 2024 | below 0.0005 µg/l 5 Jun 2024 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 1 | Jun 2024 – Jun 2024 | below 0.004 µg/l 5 Jun 2024 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 1 | Jun 2024 – Jun 2024 | below 0.005 µg/l 5 Jun 2024 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 1 | Jun 2024 – Jun 2024 | below 0.0005 µg/l 5 Jun 2024 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 1 | Jun 2024 – Jun 2024 | below 0.001 µg/l 5 Jun 2024 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 1 | Jun 2024 – Jun 2024 | below 0.0005 µg/l 5 Jun 2024 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 33 | Oct 2023 – Aug 2026 | 240 mg/l 14 Aug 2026 |
| Ammonia un-ionised as N 0119 | River water | 33 | Oct 2023 – Aug 2026 | below 0.00102 mg/l 14 Aug 2026 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 1 | Jun 2024 – Jun 2024 | below 0.001 µg/l 5 Jun 2024 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 1 | Jun 2024 – Jun 2024 | below 0.002 µg/l 5 Jun 2024 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 1 | Jun 2024 – Jun 2024 | below 0.002 µg/l 5 Jun 2024 |
| Nitrite as N 0118 | River water | 33 | Oct 2023 – Aug 2026 | 0.0068 mg/l 14 Aug 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 33 | Oct 2023 – Aug 2026 | 4.8 mg/l 14 Aug 2026 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 1 | Jun 2024 – Jun 2024 | below 0.0005 µg/l 5 Jun 2024 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 1 | Jun 2024 – Jun 2024 | below 0.0005 µg/l 5 Jun 2024 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 1 | Jun 2024 – Jun 2024 | below 0.0005 µg/l 5 Jun 2024 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 1 | Jun 2024 – Jun 2024 | below 0.0005 µg/l 5 Jun 2024 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 1 | Jun 2024 – Jun 2024 | below 0.0005 µg/l 5 Jun 2024 |
| Perfluorobutanesulfonic acid 2972 | River water | 1 | Jun 2024 – Jun 2024 | below 0.001 µg/l 5 Jun 2024 |
| Perfluorobutanoic acid 2995 | River water | 1 | Jun 2024 – Jun 2024 | below 0.001 µg/l 5 Jun 2024 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 1 | Jun 2024 – Jun 2024 | below 0.0005 µg/l 5 Jun 2024 |
| Perfluorododecane sulfonic acid 2968 | River water | 1 | Jun 2024 – Jun 2024 | below 0.005 µg/l 5 Jun 2024 |
| Perfluorododecanoic acid 8894 | River water | 1 | Jun 2024 – Jun 2024 | below 0.002 µg/l 5 Jun 2024 |
| Perfluoroheptanesulfonic acid 2967 | River water | 1 | Jun 2024 – Jun 2024 | below 0.0005 µg/l 5 Jun 2024 |
| Perfluoroheptanoic acid 8889 | River water | 1 | Jun 2024 – Jun 2024 | below 0.001 µg/l 5 Jun 2024 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 1 | Jun 2024 – Jun 2024 | below 0.0005 µg/l 5 Jun 2024 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 1 | Jun 2024 – Jun 2024 | below 0.0005 µg/l 5 Jun 2024 |
| Perfluorohexanoic acid 8888 | River water | 1 | Jun 2024 – Jun 2024 | 0.00093 µg/l 5 Jun 2024 |
| Perfluorooctanesulfonamide 2961 | River water | 1 | Jun 2024 – Jun 2024 | below 0.001 µg/l 5 Jun 2024 |
| Perfluoropentanesulfonic acid 2957 | River water | 1 | Jun 2024 – Jun 2024 | below 0.0005 µg/l 5 Jun 2024 |
| Perfluoropentanoic acid 8887 | River water | 1 | Jun 2024 – Jun 2024 | 0.001 µg/l 5 Jun 2024 |
| Perfluorotetradecanoic acid 8895 | River water | 1 | Jun 2024 – Jun 2024 | below 0.006 µg/l 5 Jun 2024 |
| Perfluorotridecanoic acid 2955 | River water | 1 | Jun 2024 – Jun 2024 | below 0.005 µg/l 5 Jun 2024 |
| Perfluoroundecane sulfonic acid 2953 | River water | 1 | Jun 2024 – Jun 2024 | below 0.004 µg/l 5 Jun 2024 |
| Perfluoroundecanoic acid 8893 | River water | 1 | Jun 2024 – Jun 2024 | below 0.002 µg/l 5 Jun 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.