Colne at Hampermill, Oxhey
EA name: COLNE AT HAMPERMILL, OXHEY
Environment Agency sampling point TH-PCNR0028 · 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
- 20 Jul 2026, 12:282 months ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 33 since 10 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 509799, 193977As published, to the nearest 1 m. Open in a map
- River, by its own name
- Colne
- River, by the map
- River ColnePlaced on the river its name gives, 2 m from the line.
- Next gauge downstream
- Moor Lane On the River Colne · 2.3 km along the river
- Nearest gauge upstream
- Watford On the River Colne · 6.1 km along the river
- Why it was sampled
- Environmental monitoring statutory (EU directives) (31 samples)
Planned investigation (local monitoring) (2 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
85.5%
Sampled 20 Jul 2026, 2 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 20 Jul 2026, 12:28 | 85.5 | 85.5% |
| 17 Jun 2026, 09:31 | 82.1 | 82.1% |
| 21 May 2026, 09:40 | 82.3 | 82.3% |
| 29 Apr 2026, 10:33 | 91.7 | 91.7% |
| 2 Mar 2026, 12:17 | 96 | 96% |
| 6 Feb 2026, 13:35 | 92.6 | 92.6% |
| 6 Jan 2026, 09:55 | 73.9 | 73.9% |
| 3 Dec 2025, 12:50 | 87.2 | 87.2% |
| 10 Nov 2025, 11:20 | 72.1 | 72.1% |
| 15 Oct 2025, 13:03 | 81.8 | 81.8% |
| 1 Sep 2025, 09:10 | 67.1 | 67.1% |
| 9 Jul 2025, 10:39 | 83.7 | 83.7% |
| 20 Jun 2025, 11:25 | 82.7 | 82.7% |
| 29 May 2025, 09:10 | 76.8 | 76.8% |
| 30 Apr 2025, 14:40 | 113.6 | 113.6% |
| 12 Mar 2025, 11:25 | 107.2 | 107.2% |
| 4 Feb 2025, 09:29 | 96.4 | 96.4% |
| 21 Jan 2025, 13:40 | 100.2 | 100.2% |
| 3 Dec 2024, 13:05 | 91.8 | 91.8% |
| 6 Nov 2024, 12:51 | 90 | 90% |
| 16 Oct 2024, 10:00 | 87.2 | 87.2% |
| 24 Sep 2024, 12:17 | 75.1 | 75.1% |
| 6 Aug 2024, 09:13 | 84.4 | 84.4% |
| 9 Jul 2024, 09:10 | 78.5 | 78.5% |
| 10 Jun 2024, 09:09 | 84.6 | 84.6% |
| 1 Mar 2024, 08:51 | 89.9 | 89.9% |
| 12 Feb 2024, 09:57 | 86.7 | 86.7% |
| 11 Jan 2024, 12:07 | 91.2 | 91.2% |
| 12 Dec 2023, 12:27 | 86.4 | 86.4% |
| 9 Nov 2023, 10:57 | 88.2 | 88.2% |
| 10 Oct 2023, 11:32 | 80.8 | 80.8% |
Dissolved oxygen
as O2 · code 9924 · mg/l
8.12 mg/l
Sampled 20 Jul 2026, 2 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 20 Jul 2026, 12:28 | 8.12 | 8.12 mg/l |
| 17 Jun 2026, 09:31 | 7.8 | 7.8 mg/l |
| 21 May 2026, 09:40 | 8.48 | 8.48 mg/l |
| 29 Apr 2026, 10:33 | 9.91 | 9.91 mg/l |
| 2 Mar 2026, 12:17 | 10.7 | 10.7 mg/l |
| 6 Feb 2026, 13:35 | 10.7 | 10.7 mg/l |
| 6 Jan 2026, 09:55 | 10.1 | 10.1 mg/l |
| 3 Dec 2025, 12:50 | 10.1 | 10.1 mg/l |
| 10 Nov 2025, 11:20 | 7.66 | 7.66 mg/l |
| 15 Oct 2025, 13:03 | 8.58 | 8.58 mg/l |
| 1 Sep 2025, 09:10 | 6.55 | 6.55 mg/l |
| 9 Jul 2025, 10:39 | 8.14 | 8.14 mg/l |
| 20 Jun 2025, 11:25 | 7.59 | 7.59 mg/l |
| 29 May 2025, 09:10 | 7.77 | 7.77 mg/l |
| 30 Apr 2025, 14:40 | 11.1 | 11.1 mg/l |
| 12 Mar 2025, 11:25 | 12.5 | 12.5 mg/l |
| 4 Feb 2025, 09:29 | 11.8 | 11.8 mg/l |
| 21 Jan 2025, 13:40 | 12.3 | 12.3 mg/l |
| 3 Dec 2024, 13:05 | 10.5 | 10.5 mg/l |
| 6 Nov 2024, 12:51 | 9.72 | 9.72 mg/l |
| 16 Oct 2024, 10:00 | 9.15 | 9.15 mg/l |
| 24 Sep 2024, 12:17 | 7.39 | 7.39 mg/l |
| 6 Aug 2024, 09:13 | 8.02 | 8.02 mg/l |
| 9 Jul 2024, 09:10 | 7.78 | 7.78 mg/l |
| 10 Jun 2024, 09:09 | 8.83 | 8.83 mg/l |
| 1 Mar 2024, 08:51 | 10.6 | 10.6 mg/l |
| 12 Feb 2024, 09:57 | 10.3 | 10.3 mg/l |
| 11 Jan 2024, 12:07 | 11.9 | 11.9 mg/l |
| 12 Dec 2023, 12:27 | 10.1 | 10.1 mg/l |
| 9 Nov 2023, 10:57 | 10 | 10 mg/l |
| 10 Oct 2023, 11:32 | 8.09 | 8.09 mg/l |
Water temperature
code 0076 · °C
17.7 °C
Sampled 20 Jul 2026, 2 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 20 Jul 2026, 12:28 | 17.7 | 17.7 °C |
| 17 Jun 2026, 09:31 | 17.7 | 17.7 °C |
| 21 May 2026, 09:40 | 13.9 | 13.9 °C |
| 29 Apr 2026, 10:33 | 11.8 | 11.8 °C |
| 2 Mar 2026, 12:17 | 10.3 | 10.3 °C |
| 6 Feb 2026, 13:35 | 8.8 | 8.8 °C |
| 6 Jan 2026, 09:55 | 2.2 | 2.2 °C |
| 3 Dec 2025, 12:50 | 8.9 | 8.9 °C |
| 10 Nov 2025, 11:20 | 12.5 | 12.5 °C |
| 15 Oct 2025, 13:03 | 13.1 | 13.1 °C |
| 1 Sep 2025, 09:10 | 16.4 | 16.4 °C |
| 9 Jul 2025, 10:39 | 16.6 | 16.6 °C |
| 20 Jun 2025, 11:25 | 19.4 | 19.4 °C |
| 29 May 2025, 09:10 | 14.7 | 14.7 °C |
| 30 Apr 2025, 14:40 | 16.5 | 16.5 °C |
| 12 Mar 2025, 11:25 | 8.6 | 8.6 °C |
| 4 Feb 2025, 09:29 | 6.6 | 6.6 °C |
| 21 Jan 2025, 13:40 | 6.5 | 6.5 °C |
| 3 Dec 2024, 13:05 | 9.5 | 9.5 °C |
| 6 Nov 2024, 12:51 | 11.8 | 11.8 °C |
| 16 Oct 2024, 10:00 | 13.1 | 13.1 °C |
| 24 Sep 2024, 12:17 | 16 | 16 °C |
| 6 Aug 2024, 09:13 | 17.7 | 17.7 °C |
| 9 Jul 2024, 09:10 | 15.7 | 15.7 °C |
| 10 Jun 2024, 09:09 | 13.3 | 13.3 °C |
| 1 Mar 2024, 08:51 | 8 | 8 °C |
| 12 Feb 2024, 09:57 | 7.7 | 7.7 °C |
| 11 Jan 2024, 12:07 | 4.2 | 4.2 °C |
| 12 Dec 2023, 12:27 | 8.5 | 8.5 °C |
| 9 Nov 2023, 10:57 | 9.7 | 9.7 °C |
| 10 Oct 2023, 11:32 | 15.2 | 15.2 °C |
pH
code 0061
7.98
Sampled 20 Jul 2026, 2 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 20 Jul 2026, 12:28 | 7.98 | 7.98 |
| 17 Jun 2026, 09:31 | 7.98 | 7.98 |
| 21 May 2026, 09:40 | 8.15 | 8.15 |
| 29 Apr 2026, 10:33 | 8.58 | 8.58 |
| 2 Mar 2026, 12:17 | 8.09 | 8.09 |
| 6 Feb 2026, 13:35 | 8.22 | 8.22 |
| 6 Jan 2026, 09:55 | 8.15 | 8.15 |
| 3 Dec 2025, 12:50 | 8.14 | 8.14 |
| 10 Nov 2025, 11:20 | 7.9 | 7.9 |
| 15 Oct 2025, 13:03 | 7.99 | 7.99 |
| 1 Sep 2025, 09:10 | 8.04 | 8.04 |
| 9 Jul 2025, 10:39 | 8.01 | 8.01 |
| 20 Jun 2025, 11:25 | 8.01 | 8.01 |
| 29 May 2025, 09:10 | 7.85 | 7.85 |
| 30 Apr 2025, 14:40 | 8.3 | 8.3 |
| 12 Mar 2025, 11:25 | 8.32 | 8.32 |
| 4 Feb 2025, 09:29 | 8.1 | 8.1 |
| 21 Jan 2025, 13:40 | 8.21 | 8.21 |
| 3 Dec 2024, 13:05 | 7.95 | 7.95 |
| 6 Nov 2024, 12:51 | 8.09 | 8.09 |
| 16 Oct 2024, 10:00 | 7.88 | 7.88 |
| 24 Sep 2024, 12:17 | 7.6 | 7.6 |
| 6 Aug 2024, 09:13 | 8.08 | 8.08 |
| 9 Jul 2024, 09:10 | 7.82 | 7.82 |
| 10 Jun 2024, 09:09 | 8.13 | 8.13 |
| 1 Mar 2024, 08:51 | 7.79 | 7.79 |
| 12 Feb 2024, 09:57 | 7.78 | 7.78 |
| 11 Jan 2024, 12:07 | 8.08 | 8.08 |
| 12 Dec 2023, 12:27 | 8.12 | 8.12 |
| 9 Nov 2023, 10:57 | 7.97 | 7.97 |
| 10 Oct 2023, 11:32 | 7.88 | 7.88 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.035 mg/l
Sampled 20 Jul 2026, 2 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 20 Jul 2026, 12:28 | 0.035 | 0.035 mg/l |
| 17 Jun 2026, 09:31 | 0.035 | 0.035 mg/l |
| 21 May 2026, 09:40 | 0.055 | 0.055 mg/l |
| 29 Apr 2026, 10:33 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Mar 2026, 12:17 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Feb 2026, 13:35 | 0.045 | 0.045 mg/l |
| 6 Jan 2026, 09:55 | 0.32 | 0.32 mg/l |
| 3 Dec 2025, 12:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Nov 2025, 11:20 | 0.076 | 0.076 mg/l |
| 15 Oct 2025, 13:03 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Sep 2025, 09:10 | 0.031 | 0.031 mg/l |
| 9 Jul 2025, 10:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Jun 2025, 11:25 | 0.054 | 0.054 mg/l |
| 29 May 2025, 09:10 | 0.071 | 0.071 mg/l |
| 30 Apr 2025, 14:40 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Mar 2025, 11:25 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Feb 2025, 09:29 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Jan 2025, 13:40 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Dec 2024, 13:05 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Nov 2024, 12:51 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Oct 2024, 10:00 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Sep 2024, 12:17 | 0.063 | 0.063 mg/l |
| 6 Aug 2024, 09:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Jul 2024, 09:10 | 0.04 | 0.04 mg/l |
| 10 Jun 2024, 09:09 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Mar 2024, 08:51 | 0.03 | 0.03 mg/l |
| 12 Feb 2024, 09:57 | 0.69 | 0.69 mg/l |
| 11 Jan 2024, 12:07 | 0.033 | 0.033 mg/l |
| 12 Dec 2023, 12:27 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Nov 2023, 10:57 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Oct 2023, 11:32 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
14 mg/l
Sampled 20 Jul 2026, 2 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 20 Jul 2026, 12:28 | 14 | 14 mg/l |
| 17 Jun 2026, 09:31 | 12 | 12 mg/l |
| 21 May 2026, 09:40 | 12 | 12 mg/l |
| 29 Apr 2026, 10:33 | 13 | 13 mg/l |
| 2 Mar 2026, 12:17 | 6.99 | 6.99 mg/l |
| 6 Feb 2026, 13:35 | 3.39 | 3.39 mg/l |
| 6 Jan 2026, 09:55 | 12 | 12 mg/l |
| 3 Dec 2025, 12:50 | 12 | 12 mg/l |
| 10 Nov 2025, 11:20 | 13 | 13 mg/l |
| 15 Oct 2025, 13:03 | 15 | 15 mg/l |
| 1 Sep 2025, 09:10 | 10.9 | 10.9 mg/l |
| 9 Jul 2025, 10:39 | 8.38 | 8.38 mg/l |
| 20 Jun 2025, 11:25 | 12 | 12 mg/l |
| 29 May 2025, 09:10 | 8.17 | 8.17 mg/l |
| 30 Apr 2025, 14:40 | 11 | 11 mg/l |
| 12 Mar 2025, 11:25 | 9.99 | 9.99 mg/l |
| 4 Feb 2025, 09:29 | 8.69 | 8.69 mg/l |
| 21 Jan 2025, 13:40 | 6.19 | 6.19 mg/l |
| 3 Dec 2024, 13:05 | 8.29 | 8.29 mg/l |
| 6 Nov 2024, 12:51 | 9.99 | 9.99 mg/l |
| 16 Oct 2024, 10:00 | 7.09 | 7.09 mg/l |
| 24 Sep 2024, 12:17 | 3.18 | 3.18 mg/l |
| 6 Aug 2024, 09:13 | 9.99 | 9.99 mg/l |
| 9 Jul 2024, 09:10 | 4.37 | 4.37 mg/l |
| 10 Jun 2024, 09:09 | 8.08 | 8.08 mg/l |
| 1 Mar 2024, 08:51 | 5.78 | 5.78 mg/l |
| 12 Feb 2024, 09:57 | 5.08 | 5.08 mg/l |
| 11 Jan 2024, 12:07 | 8.28 | 8.28 mg/l |
| 12 Dec 2023, 12:27 | 4.39 | 4.39 mg/l |
| 9 Nov 2023, 10:57 | 7.69 | 7.69 mg/l |
| 10 Oct 2023, 11:32 | 13 | 13 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.2 mg/l
Sampled 20 Jul 2026, 2 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 20 Jul 2026, 12:28 | 0.2 | 0.2 mg/l |
| 17 Jun 2026, 09:31 | 0.18 | 0.18 mg/l |
| 21 May 2026, 09:40 | 0.21 | 0.21 mg/l |
| 29 Apr 2026, 10:33 | 0.24 | 0.24 mg/l |
| 2 Mar 2026, 12:17 | 0.11 | 0.11 mg/l |
| 6 Feb 2026, 13:35 | 0.11 | 0.11 mg/l |
| 6 Jan 2026, 09:55 | 0.48 | 0.48 mg/l |
| 3 Dec 2025, 12:50 | 0.14 | 0.14 mg/l |
| 10 Nov 2025, 11:20 | 0.18 | 0.18 mg/l |
| 15 Oct 2025, 13:03 | 0.18 | 0.18 mg/l |
| 1 Sep 2025, 09:10 | 0.32 | 0.32 mg/l |
| 9 Jul 2025, 10:39 | 0.38 | 0.38 mg/l |
| 20 Jun 2025, 11:25 | 0.36 | 0.36 mg/l |
| 29 May 2025, 09:10 | 0.28 | 0.28 mg/l |
| 30 Apr 2025, 14:40 | 0.32 | 0.32 mg/l |
| 12 Mar 2025, 11:25 | 0.1 | 0.1 mg/l |
| 4 Feb 2025, 09:29 | 0.14 | 0.14 mg/l |
| 21 Jan 2025, 13:40 | 0.13 | 0.13 mg/l |
| 3 Dec 2024, 13:05 | 0.15 | 0.15 mg/l |
| 6 Nov 2024, 12:51 | 0.59 | 0.59 mg/l |
| 16 Oct 2024, 10:00 | 0.15 | 0.15 mg/l |
| 24 Sep 2024, 12:17 | 0.38 | 0.38 mg/l |
| 6 Aug 2024, 09:13 | 0.21 | 0.21 mg/l |
| 9 Jul 2024, 09:10 | 0.13 | 0.13 mg/l |
| 10 Jun 2024, 09:09 | 0.14 | 0.14 mg/l |
| 1 Mar 2024, 08:51 | 0.1 | 0.1 mg/l |
| 12 Feb 2024, 09:57 | 0.16 | 0.16 mg/l |
| 11 Jan 2024, 12:07 | 0.12 | 0.12 mg/l |
| 12 Dec 2023, 12:27 | 0.11 | 0.11 mg/l |
| 9 Nov 2023, 10:57 | 0.52 | 0.52 mg/l |
| 10 Oct 2023, 11:32 | 0.37 | 0.37 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
940 µS/cm
Sampled 20 Jul 2026, 2 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 20 Jul 2026, 12:28 | 940 | 940 µS/cm |
| 17 Jun 2026, 09:31 | 867 | 867 µS/cm |
| 21 May 2026, 09:40 | 871 | 871 µS/cm |
| 29 Apr 2026, 10:33 | 891 | 891 µS/cm |
| 2 Mar 2026, 12:17 | 748 | 748 µS/cm |
| 6 Feb 2026, 13:35 | 490 | 490 µS/cm |
| 6 Jan 2026, 09:55 | 881 | 881 µS/cm |
| 3 Dec 2025, 12:50 | 904 | 904 µS/cm |
| 10 Nov 2025, 11:20 | 880 | 880 µS/cm |
| 15 Oct 2025, 13:03 | 994 | 994 µS/cm |
| 1 Sep 2025, 09:10 | 889 | 889 µS/cm |
| 9 Jul 2025, 10:39 | 791 | 791 µS/cm |
| 20 Jun 2025, 11:25 | 914 | 914 µS/cm |
| 29 May 2025, 09:10 | 783 | 783 µS/cm |
| 30 Apr 2025, 14:40 | 875 | 875 µS/cm |
| 12 Mar 2025, 11:25 | 830 | 830 µS/cm |
| 4 Feb 2025, 09:29 | 804 | 804 µS/cm |
| 21 Jan 2025, 13:40 | 778 | 778 µS/cm |
| 3 Dec 2024, 13:05 | 776 | 776 µS/cm |
| 6 Nov 2024, 12:51 | 827 | 827 µS/cm |
| 16 Oct 2024, 10:00 | 669 | 669 µS/cm |
| 24 Sep 2024, 12:17 | 421 | 421 µS/cm |
| 6 Aug 2024, 09:13 | 848 | 848 µS/cm |
| 9 Jul 2024, 09:10 | 504 | 504 µS/cm |
| 10 Jun 2024, 09:09 | 819 | 819 µS/cm |
| 1 Mar 2024, 08:51 | 682 | 682 µS/cm |
| 12 Feb 2024, 09:57 | 613 | 613 µS/cm |
| 11 Jan 2024, 12:07 | 744 | 744 µS/cm |
| 12 Dec 2023, 12:27 | 493 | 493 µS/cm |
| 9 Nov 2023, 10:57 | 758 | 758 µS/cm |
| 10 Oct 2023, 11:32 | 1037 | 1037 µS/cm |
Everything measured here
162 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 162 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 31 | Oct 2023 – Jul 2026 | 85.5% 20 Jul 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 31 | Oct 2023 – Jul 2026 | 8.12 mg/l 20 Jul 2026 |
| Temperature of Water 0076 | River water | 31 | Oct 2023 – Jul 2026 | 17.7 °C 20 Jul 2026 |
| pH 0061 | River water | 31 | Oct 2023 – Jul 2026 | 7.98 20 Jul 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 31 | Oct 2023 – Jul 2026 | 0.035 mg/l 20 Jul 2026 |
| Nitrate as N 0117 | River water | 31 | Oct 2023 – Jul 2026 | 14 mg/l 20 Jul 2026 |
| Orthophosphate, reactive as P 0180 | River water | 31 | Oct 2023 – Jul 2026 | 0.2 mg/l 20 Jul 2026 |
| Conductivity at 25 C 0077 | River water | 31 | Oct 2023 – Jul 2026 | 940 µS/cm 20 Jul 2026 |
| 1,2,3-Trichlorobenzene 9050 | River water | 26 | Apr 2024 – Jul 2026 | below 0.01 µg/l 20 Jul 2026 |
| 1,2,4-Trichlorobenzene 9051 | River water | 26 | Apr 2024 – Jul 2026 | below 0.01 µg/l 20 Jul 2026 |
| 1,3,5-Trichlorobenzene 9052 | River water | 25 | Apr 2024 – Jun 2026 | below 0.01 µg/l 17 Jun 2026 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 1 | Jun 2024 – Jun 2024 | below 0.001 µg/l 10 Jun 2024 |
| 2,3,5,6-Tetrachloroaniline 9350 | River water | 26 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| 2,3,5,6-Tetrachlorothioanisole 8995 | River water | 26 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 1 | Jun 2024 – Jun 2024 | below 0.001 µg/l 10 Jun 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 1 | Jun 2024 – Jun 2024 | below 0.001 µg/l 10 Jun 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 1 | Jun 2024 – Jun 2024 | below 0.002 µg/l 10 Jun 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 1 | Jun 2024 – Jun 2024 | below 0.0005 µg/l 10 Jun 2024 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 1 | Jun 2024 – Jun 2024 | below 0.001 µg/l 10 Jun 2024 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 1 | Jun 2024 – Jun 2024 | below 0.0005 µg/l 10 Jun 2024 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 1 | Jun 2024 – Jun 2024 | below 0.004 µg/l 10 Jun 2024 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 1 | Jun 2024 – Jun 2024 | below 0.005 µg/l 10 Jun 2024 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 1 | Jun 2024 – Jun 2024 | below 0.0005 µg/l 10 Jun 2024 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 1 | Jun 2024 – Jun 2024 | below 0.001 µg/l 10 Jun 2024 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 1 | Jun 2024 – Jun 2024 | below 0.001 µg/l 10 Jun 2024 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 1 | Jun 2024 – Jun 2024 | below 0.0005 µg/l 10 Jun 2024 |
| Aldrin 0483 | River water | 26 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 31 | Oct 2023 – Jul 2026 | 240 mg/l 20 Jul 2026 |
| Ammonia un-ionised as N 0119 | River water | 31 | Oct 2023 – Jul 2026 | 0.00107 mg/l 20 Jul 2026 |
| Atrazine 3002 | River water | 25 | Apr 2024 – Jul 2026 | 0.01 µg/l 20 Jul 2026 |
| Atrazine-desethyl :- {Atrazine-de-ethyl} 8804 | River water | 25 | Apr 2024 – Jul 2026 | 0.025 µg/l 20 Jul 2026 |
| Atrazine-desisopropyl :- {Atrazine de-isopropyl} 8997 | River water | 25 | Apr 2024 – Jul 2026 | below 0.02 µg/l 20 Jul 2026 |
| Azinphos-ethyl 9863 | River water | 25 | Apr 2024 – Jul 2026 | below 0.006 µg/l 20 Jul 2026 |
| Azinphos-methyl 9715 | River water | 25 | Apr 2024 – Jul 2026 | below 0.003 µg/l 20 Jul 2026 |
| Bendiocarb 9338 | River water | 25 | Apr 2024 – Jul 2026 | below 0.005 µg/l 20 Jul 2026 |
| Bupirimate 9606 | River water | 25 | Apr 2024 – Jul 2026 | below 0.005 µg/l 20 Jul 2026 |
| Carbophenothion 9519 | River water | 22 | Apr 2024 – Jul 2026 | below 0.005 µg/l 20 Jul 2026 |
| Chlorfenvinphos 0503 | River water | 25 | Apr 2024 – Jul 2026 | below 0.01 µg/l 20 Jul 2026 |
| Chlorothalonil 6615 | River water | 25 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| Chlorpropham 3113 | River water | 26 | Apr 2024 – Jul 2026 | below 0.005 µg/l 20 Jul 2026 |
| Chlorpyrifos-ethyl 9978 | River water | 25 | Apr 2024 – Jul 2026 | below 0.002 µg/l 20 Jul 2026 |
| Chlorpyrifos-methyl 7181 | River water | 25 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| cis-Chlordane 0577 | River water | 26 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| cis-Heptachlor epoxide 8864 | River water | 26 | Apr 2024 – Jul 2026 | below 0.003 µg/l 20 Jul 2026 |
| Coumaphos 9474 | River water | 25 | Apr 2024 – Jul 2026 | below 0.005 µg/l 20 Jul 2026 |
| Cyanazine 6628 | River water | 25 | Apr 2024 – Jul 2026 | below 0.006 µg/l 20 Jul 2026 |
| DDE -op 0581 | River water | 26 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| DDE -pp 0551 | River water | 26 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| DDT -op 0539 | River water | 26 | Apr 2024 – Jul 2026 | below 0.003 µg/l 20 Jul 2026 |
| DDT -pp 0555 | River water | 26 | Apr 2024 – Jul 2026 | below 0.002 µg/l 20 Jul 2026 |
| Desmetryn 6635 | River water | 22 | Apr 2024 – Jul 2026 | below 0.005 µg/l 20 Jul 2026 |
| Diazinon 0723 | River water | 25 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| Dichlobenil 9477 | River water | 26 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| Dichlorvos 0507 | River water | 25 | Apr 2024 – Jul 2026 | below 0.004 µg/l 20 Jul 2026 |
| Dieldrin 0511 | River water | 25 | Apr 2024 – Jul 2026 | below 0.002 µg/l 20 Jul 2026 |
| Dimethoate 6447 | River water | 25 | Apr 2024 – Jul 2026 | below 0.006 µg/l 20 Jul 2026 |
| Endosulfan A 0569 | River water | 26 | Apr 2024 – Jul 2026 | below 0.003 µg/l 20 Jul 2026 |
| Endosulfan B 0570 | River water | 25 | Apr 2024 – Jul 2026 | below 0.004 µg/l 20 Jul 2026 |
| Endrin 0562 | River water | 26 | Apr 2024 – Jul 2026 | below 0.003 µg/l 20 Jul 2026 |
| Ethion 9979 | River water | 25 | Apr 2024 – Jul 2026 | below 0.005 µg/l 20 Jul 2026 |
| Ethofumesate 7154 | River water | 25 | Apr 2024 – Jul 2026 | below 0.005 µg/l 20 Jul 2026 |
| Fenchlorphos :- {Ronnel} 6640 | River water | 25 | Apr 2024 – Jul 2026 | below 0.005 µg/l 20 Jul 2026 |
| Fenitrothion 9716 | River water | 25 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| Fenpropimorph 6776 | River water | 25 | Apr 2024 – Jul 2026 | below 0.007 µg/l 20 Jul 2026 |
| Fenthion 1118 | River water | 25 | Apr 2024 – Jul 2026 | below 0.008 µg/l 20 Jul 2026 |
| Fonofos 7159 | River water | 25 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| HCH -alpha 0487 | River water | 26 | Apr 2024 – Jul 2026 | below 0.003 µg/l 20 Jul 2026 |
| HCH -beta 0491 | River water | 26 | Apr 2024 – Jul 2026 | below 0.003 µg/l 20 Jul 2026 |
| HCH -delta 0495 | River water | 26 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| HCH -epsilon 8942 | River water | 25 | Apr 2024 – Jul 2026 | below 0.003 µg/l 20 Jul 2026 |
| HCH -gamma :- {Lindane} 0499 | River water | 26 | Apr 2024 – Jul 2026 | below 0.003 µg/l 20 Jul 2026 |
| Heptachlor 0527 | River water | 26 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| Hexachlorobenzene 0576 | River water | 26 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| Hexachlorobutadiene 6648 | River water | 26 | Apr 2024 – Jul 2026 | below 0.003 µg/l 20 Jul 2026 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 1 | Jun 2024 – Jun 2024 | below 0.001 µg/l 10 Jun 2024 |
| Iodofenphos 9000 | River water | 25 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| Iprodione 6649 | River water | 25 | Apr 2024 – Jul 2026 | below 0.008 µg/l 20 Jul 2026 |
| Irgarol 1051 8999 | River water | 25 | Apr 2024 – Jul 2026 | below 0.005 µg/l 20 Jul 2026 |
| Isodrin 9494 | River water | 26 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| Malathion 0535 | River water | 25 | Apr 2024 – Jul 2026 | below 0.002 µg/l 20 Jul 2026 |
| Metalaxyl 9860 | River water | 25 | Apr 2024 – Jul 2026 | below 0.008 µg/l 20 Jul 2026 |
| Metazachlor 9002 | River water | 25 | Apr 2024 – Jul 2026 | below 0.005 µg/l 20 Jul 2026 |
| Mevinphos 9479 | River water | 25 | Apr 2024 – Jul 2026 | below 0.008 µg/l 20 Jul 2026 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 1 | Jun 2024 – Jun 2024 | below 0.002 µg/l 10 Jun 2024 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 1 | Jun 2024 – Jun 2024 | below 0.002 µg/l 10 Jun 2024 |
| Napropamide 6976 | River water | 25 | Apr 2024 – Jul 2026 | below 0.005 µg/l 20 Jul 2026 |
| Nitrite as N 0118 | River water | 31 | Oct 2023 – Jul 2026 | 0.016 mg/l 20 Jul 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 31 | Oct 2023 – Jul 2026 | 14 mg/l 20 Jul 2026 |
| Parathion-ethyl :- {Parathion} 0543 | River water | 25 | Apr 2024 – Jul 2026 | below 0.004 µg/l 20 Jul 2026 |
| Parathion-methyl 1119 | River water | 25 | Apr 2024 – Jul 2026 | below 0.005 µg/l 20 Jul 2026 |
| PCB - 008 9466 | River water | 11 | Sep 2025 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| PCB - 020 9468 | River water | 11 | Sep 2025 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| PCB - 028 9768 | River water | 26 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| PCB - 031 6666 | River water | 11 | Sep 2025 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| PCB - 035 9467 | River water | 11 | Sep 2025 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| PCB - 052 9769 | River water | 25 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| PCB - 077 9196 | River water | 11 | Sep 2025 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| PCB - 101 9770 | River water | 26 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| PCB - 105 9197 | River water | 26 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| PCB - 118 9771 | River water | 26 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| PCB - 126 8287 | River water | 11 | Sep 2025 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| PCB - 128 8342 | River water | 11 | Sep 2025 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| PCB - 138 9772 | River water | 26 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| PCB - 149 5861 | River water | 11 | Sep 2025 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| PCB - 153 9773 | River water | 26 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| PCB - 156 9258 | River water | 26 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| PCB - 169 9198 | River water | 11 | Sep 2025 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| PCB - 170 9199 | River water | 11 | Sep 2025 – Jul 2026 | below 0.002 µg/l 20 Jul 2026 |
| PCB - 180 9774 | River water | 26 | Apr 2024 – Jul 2026 | below 0.002 µg/l 20 Jul 2026 |
| Pendimethalin 9892 | River water | 26 | Apr 2024 – Jul 2026 | below 0.01 µg/l 20 Jul 2026 |
| Pentachlorobenzene 5863 | River water | 11 | Sep 2025 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 1 | Jun 2024 – Jun 2024 | below 0.0005 µg/l 10 Jun 2024 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 1 | Jun 2024 – Jun 2024 | below 0.0005 µg/l 10 Jun 2024 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 1 | Jun 2024 – Jun 2024 | below 0.0005 µg/l 10 Jun 2024 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 1 | Jun 2024 – Jun 2024 | below 0.0005 µg/l 10 Jun 2024 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 1 | Jun 2024 – Jun 2024 | below 0.0005 µg/l 10 Jun 2024 |
| Perfluorobutanesulfonic acid 2972 | River water | 1 | Jun 2024 – Jun 2024 | 0.0032 µg/l 10 Jun 2024 |
| Perfluorobutanoic acid 2995 | River water | 1 | Jun 2024 – Jun 2024 | 0.0034 µg/l 10 Jun 2024 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 1 | Jun 2024 – Jun 2024 | 0.00076 µg/l 10 Jun 2024 |
| Perfluorodecanesulfonic acid 2969 | River water | 1 | Jun 2024 – Jun 2024 | below 0.002 µg/l 10 Jun 2024 |
| Perfluorodecanoic acid 8892 | River water | 1 | Jun 2024 – Jun 2024 | below 0.002 µg/l 10 Jun 2024 |
| Perfluorododecane sulfonic acid 2968 | River water | 1 | Jun 2024 – Jun 2024 | below 0.005 µg/l 10 Jun 2024 |
| Perfluorododecanoic acid 8894 | River water | 1 | Jun 2024 – Jun 2024 | below 0.002 µg/l 10 Jun 2024 |
| Perfluoroheptanesulfonic acid 2967 | River water | 1 | Jun 2024 – Jun 2024 | below 0.0005 µg/l 10 Jun 2024 |
| Perfluoroheptanoic acid 8889 | River water | 1 | Jun 2024 – Jun 2024 | 0.0015 µg/l 10 Jun 2024 |
| Perfluorohexanesulfonamide 2965 | River water | 1 | Jun 2024 – Jun 2024 | below 0.0005 µg/l 10 Jun 2024 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 1 | Jun 2024 – Jun 2024 | 0.0013 µg/l 10 Jun 2024 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 1 | Jun 2024 – Jun 2024 | 0.0057 µg/l 10 Jun 2024 |
| Perfluorohexanoic acid 8888 | River water | 1 | Jun 2024 – Jun 2024 | 0.0036 µg/l 10 Jun 2024 |
| Perfluorononanesulfonic acid 2963 | River water | 1 | Jun 2024 – Jun 2024 | below 0.0005 µg/l 10 Jun 2024 |
| Perfluorononanoic acid 8891 | River water | 1 | Jun 2024 – Jun 2024 | below 0.001 µg/l 10 Jun 2024 |
| Perfluorooctadecanoic acid 2962 | River water | 1 | Jun 2024 – Jun 2024 | below 0.002 µg/l 10 Jun 2024 |
| Perfluorooctanesulfonamide 2961 | River water | 1 | Jun 2024 – Jun 2024 | below 0.001 µg/l 10 Jun 2024 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 1 | Jun 2024 – Jun 2024 | 0.005 µg/l 10 Jun 2024 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 1 | Jun 2024 – Jun 2024 | 0.0063 µg/l 10 Jun 2024 |
| Perfluorooctanoic acid 8890 | River water | 1 | Jun 2024 – Jun 2024 | 0.0025 µg/l 10 Jun 2024 |
| Perfluoropentanesulfonic acid 2957 | River water | 1 | Jun 2024 – Jun 2024 | 0.00098 µg/l 10 Jun 2024 |
| Perfluoropentanoic acid 8887 | River water | 1 | Jun 2024 – Jun 2024 | 0.0042 µg/l 10 Jun 2024 |
| Perfluorotetradecanoic acid 8895 | River water | 1 | Jun 2024 – Jun 2024 | below 0.006 µg/l 10 Jun 2024 |
| Perfluorotridecanoic acid 2955 | River water | 1 | Jun 2024 – Jun 2024 | below 0.005 µg/l 10 Jun 2024 |
| Perfluoroundecane sulfonic acid 2953 | River water | 1 | Jun 2024 – Jun 2024 | below 0.004 µg/l 10 Jun 2024 |
| Perfluoroundecanoic acid 8893 | River water | 1 | Jun 2024 – Jun 2024 | below 0.002 µg/l 10 Jun 2024 |
| Pirimicarb 9959 | River water | 24 | Apr 2024 – Jul 2026 | below 0.004 µg/l 20 Jul 2026 |
| Pirimiphos-ethyl 8998 | River water | 25 | Apr 2024 – Jul 2026 | below 0.005 µg/l 20 Jul 2026 |
| Pirimiphos-methyl 9851 | River water | 25 | Apr 2024 – Jul 2026 | below 0.003 µg/l 20 Jul 2026 |
| Prometryn 5563 | River water | 22 | Apr 2024 – Jul 2026 | below 0.005 µg/l 20 Jul 2026 |
| Propachlor 3119 | River water | 26 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| Propazine 9634 | River water | 25 | Apr 2024 – Jul 2026 | below 0.002 µg/l 20 Jul 2026 |
| Propetamphos 9586 | River water | 25 | Apr 2024 – Jul 2026 | below 0.005 µg/l 20 Jul 2026 |
| Propyzamide 6448 | River water | 25 | Apr 2024 – Jul 2026 | below 0.005 µg/l 20 Jul 2026 |
| Simazine 3001 | River water | 25 | Apr 2024 – Jul 2026 | 0.0091 µg/l 20 Jul 2026 |
| TDE -op 0573 | River water | 24 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| TDE -pp 0559 | River water | 25 | Apr 2024 – Jul 2026 | below 0.002 µg/l 20 Jul 2026 |
| Tecnazene 9990 | River water | 26 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| Terbutryn 3009 | River water | 22 | Apr 2024 – Jul 2026 | 0.0083 µg/l 20 Jul 2026 |
| trans-Chlordane 0578 | River water | 26 | Apr 2024 – Jul 2026 | below 0.001 µg/l 20 Jul 2026 |
| trans-Heptachlor epoxide 8865 | River water | 26 | Apr 2024 – Jul 2026 | below 0.003 µg/l 20 Jul 2026 |
| Tri-allate 7135 | River water | 25 | Apr 2024 – Jul 2026 | below 0.006 µg/l 20 Jul 2026 |
| Triazophos 6487 | River water | 25 | Apr 2024 – Jul 2026 | below 0.005 µg/l 20 Jul 2026 |
| Trietazine 9911 | River water | 25 | Apr 2024 – Jul 2026 | below 0.002 µg/l 20 Jul 2026 |
| Trifluralin 9989 | River water | 26 | Apr 2024 – Jul 2026 | below 0.002 µg/l 20 Jul 2026 |
| Vinclozolin 5862 | River water | 25 | Apr 2024 – Jul 2026 | below 0.002 µg/l 20 Jul 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.