Downstream of A34
EA name: DS A34 (also listed as “RSN1522 DS A34”)
Environment Agency sampling point TH-RSN1522 · 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
- 22 Jun 2026, 10:333 months ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 29 since 12 Oct 2023 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Monitoring (national agency policy)
- Where
- National Grid 450981, 213317As published, to the nearest 1 m. Open in a map
- River, by its own name
- Its name does not give one
- River, by the map
- River CherwellPlaced by position alone (the only river line close by), 3 m from the line.
- Next gauge downstream
- Kings Mill On the River Cherwell · 12 km along the river
- Nearest gauge upstream
- Thrupp On the River Cherwell · 6.0 km along the river
- Why it was sampled
- Monitoring (national agency policy) (29 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
101.4%
Sampled 22 Jun 2026, 3 months ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 22 Jun 2026, 10:33 | 101.4 | 101.4% |
| 8 May 2026, 11:50 | 103.9 | 103.9% |
| 20 Apr 2026, 14:46 | 106.8 | 106.8% |
| 7 Apr 2026, 10:23 | 98.8 | 98.8% |
| 1 Dec 2025, 19:19 | 93.7 | 93.7% |
| 12 Nov 2025, 10:17 | 88 | 88% |
| 23 Oct 2025, 10:57 | 85.3 | 85.3% |
| 11 Sep 2025, 13:47 | 95.6 | 95.6% |
| 13 Aug 2025, 13:33 | 108.1 | 108.1% |
| 24 Jul 2025, 08:07 | 88.6 | 88.6% |
| 26 Jun 2025, 13:18 | 104.7 | 104.7% |
| 27 May 2025, 11:28 | 92.3 | 92.3% |
| 30 Apr 2025, 11:54 | 98.2 | 98.2% |
| 13 Mar 2025, 10:53 | 100.3 | 100.3% |
| 12 Feb 2025, 13:52 | 96.3 | 96.3% |
| 14 Jan 2025, 16:05 | 99 | 99% |
| 13 Nov 2024, 13:43 | 96.7 | 96.7% |
| 29 Oct 2024, 12:31 | 96.6 | 96.6% |
| 23 Sep 2024, 11:00 | 88.1 | 88.1% |
| 6 Aug 2024, 10:31 | 91.1 | 91.1% |
| 18 Jul 2024, 13:34 | 101.3 | 101.3% |
| 25 Jun 2024, 13:28 | 117.4 | 117.4% |
| 20 May 2024, 12:49 | 109.3 | 109.3% |
| 22 Apr 2024, 12:53 | 100.2 | 100.2% |
| 27 Mar 2024, 13:18 | 101.2 | 101.2% |
| 24 Jan 2024, 09:39 | 92.6 | 92.6% |
| 23 Nov 2023, 09:29 | 91.6 | 91.6% |
| 12 Oct 2023, 10:29 | 85 | 85% |
Dissolved oxygen
as O2 · code 9924 · mg/l
8.93 mg/l
Sampled 22 Jun 2026, 3 months ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 22 Jun 2026, 10:33 | 8.93 | 8.93 mg/l |
| 8 May 2026, 11:50 | 10.5 | 10.5 mg/l |
| 20 Apr 2026, 14:46 | 11.3 | 11.3 mg/l |
| 7 Apr 2026, 10:23 | 11.1 | 11.1 mg/l |
| 1 Dec 2025, 19:19 | 11.1 | 11.1 mg/l |
| 12 Nov 2025, 10:17 | 9.59 | 9.59 mg/l |
| 23 Oct 2025, 10:57 | 9.34 | 9.34 mg/l |
| 11 Sep 2025, 13:47 | 9.29 | 9.29 mg/l |
| 13 Aug 2025, 13:33 | 9.5 | 9.5 mg/l |
| 24 Jul 2025, 08:07 | 8.38 | 8.38 mg/l |
| 26 Jun 2025, 13:18 | 9.11 | 9.11 mg/l |
| 27 May 2025, 11:28 | 9.28 | 9.28 mg/l |
| 30 Apr 2025, 11:54 | 9.87 | 9.87 mg/l |
| 13 Mar 2025, 10:53 | 12.2 | 12.2 mg/l |
| 12 Feb 2025, 13:52 | 12.1 | 12.1 mg/l |
| 14 Jan 2025, 16:05 | 12.7 | 12.7 mg/l |
| 13 Nov 2024, 13:43 | 11.1 | 11.1 mg/l |
| 29 Oct 2024, 12:31 | 10.3 | 10.3 mg/l |
| 23 Sep 2024, 11:00 | 8.8 | 8.8 mg/l |
| 6 Aug 2024, 10:31 | 8.46 | 8.46 mg/l |
| 18 Jul 2024, 13:34 | 9.64 | 9.64 mg/l |
| 25 Jun 2024, 13:28 | 10.5 | 10.5 mg/l |
| 20 May 2024, 12:49 | 10.6 | 10.6 mg/l |
| 22 Apr 2024, 12:53 | 11.2 | 11.2 mg/l |
| 27 Mar 2024, 13:18 | 11.6 | 11.6 mg/l |
| 24 Jan 2024, 09:39 | 11.2 | 11.2 mg/l |
| 23 Nov 2023, 09:29 | 10.5 | 10.5 mg/l |
| 12 Oct 2023, 10:29 | 8.68 | 8.68 mg/l |
Water temperature
code 0076 · °C
21.5 °C
Sampled 22 Jun 2026, 3 months ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 22 Jun 2026, 10:33 | 21.5 | 21.5 °C |
| 8 May 2026, 11:50 | 14.7 | 14.7 °C |
| 20 Apr 2026, 14:46 | 12.7 | 12.7 °C |
| 7 Apr 2026, 10:23 | 10.2 | 10.2 °C |
| 1 Dec 2025, 19:19 | 7.9 | 7.9 °C |
| 12 Nov 2025, 10:17 | 11.4 | 11.4 °C |
| 23 Oct 2025, 10:57 | 11.2 | 11.2 °C |
| 11 Sep 2025, 13:47 | 16.6 | 16.6 °C |
| 13 Aug 2025, 13:33 | 21.6 | 21.6 °C |
| 24 Jul 2025, 08:07 | 17.9 | 17.9 °C |
| 26 Jun 2025, 13:18 | 22.1 | 22.1 °C |
| 27 May 2025, 11:28 | 15 | 15 °C |
| 30 Apr 2025, 11:54 | 15 | 15 °C |
| 13 Mar 2025, 10:53 | 6.9 | 6.9 °C |
| 12 Feb 2025, 13:52 | 5.6 | 5.6 °C |
| 14 Jan 2025, 16:05 | 4.9 | 4.9 °C |
| 13 Nov 2024, 13:43 | 9.2 | 9.2 °C |
| 29 Oct 2024, 12:31 | 12.4 | 12.4 °C |
| 23 Sep 2024, 11:00 | 15.3 | 15.3 °C |
| 6 Aug 2024, 10:31 | 18.8 | 18.8 °C |
| 18 Jul 2024, 13:34 | 17.6 | 17.6 °C |
| 25 Jun 2024, 13:28 | 20.5 | 20.5 °C |
| 20 May 2024, 12:49 | 16.7 | 16.7 °C |
| 22 Apr 2024, 12:53 | 10.3 | 10.3 °C |
| 27 Mar 2024, 13:18 | 9.4 | 9.4 °C |
| 24 Jan 2024, 09:39 | 7.1 | 7.1 °C |
| 23 Nov 2023, 09:29 | 9.1 | 9.1 °C |
| 12 Oct 2023, 10:29 | 14.3 | 14.3 °C |
pH
code 0061
8.14
Sampled 22 Jun 2026, 3 months ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 22 Jun 2026, 10:33 | 8.14 | 8.14 |
| 8 May 2026, 11:50 | 8.21 | 8.21 |
| 20 Apr 2026, 14:46 | 8.24 | 8.24 |
| 7 Apr 2026, 10:23 | 8.22 | 8.22 |
| 1 Dec 2025, 19:19 | 8.1 | 8.1 |
| 12 Nov 2025, 10:17 | 8.1 | 8.1 |
| 23 Oct 2025, 10:57 | 8.1 | 8.1 |
| 11 Sep 2025, 13:47 | 8.1 | 8.1 |
| 13 Aug 2025, 13:33 | 8.3 | 8.3 |
| 24 Jul 2025, 08:07 | 8.1 | 8.1 |
| 26 Jun 2025, 13:18 | 8.2 | 8.2 |
| 27 May 2025, 11:28 | 8.2 | 8.2 |
| 30 Apr 2025, 11:54 | 8.2 | 8.2 |
| 13 Mar 2025, 10:53 | 8.2 | 8.2 |
| 12 Feb 2025, 13:52 | 8.1 | 8.1 |
| 14 Jan 2025, 16:05 | 8.1 | 8.1 |
| 13 Nov 2024, 13:43 | 8.2 | 8.2 |
| 29 Oct 2024, 12:31 | 8.1 | 8.1 |
| 23 Sep 2024, 11:00 | 8 | 8 |
| 6 Aug 2024, 10:31 | 8.2 | 8.2 |
| 18 Jul 2024, 13:34 | 8.2 | 8.2 |
| 25 Jun 2024, 13:28 | 8.3 | 8.3 |
| 20 May 2024, 12:49 | 8.1 | 8.1 |
| 22 Apr 2024, 12:53 | 8.2 | 8.2 |
| 27 Mar 2024, 13:18 | 8.2 | 8.2 |
| 24 Jan 2024, 09:39 | 8.05 | 8.05 |
| 23 Nov 2023, 09:29 | 7.87 | 7.87 |
| 12 Oct 2023, 10:29 | 7.81 | 7.81 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 22 Jun 2026, 3 months ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 22 Jun 2026, 10:33 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 May 2026, 11:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Apr 2026, 14:46 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Dec 2025, 19:19 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Nov 2025, 10:17 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Oct 2025, 10:57 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Sep 2025, 13:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Aug 2025, 13:33 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Jul 2025, 08:07 | <0.03 | below 0.03 mg/l (not detected above this) |
| 26 Jun 2025, 13:18 | <0.03 | below 0.03 mg/l (not detected above this) |
| 27 May 2025, 11:28 | <0.03 | below 0.03 mg/l (not detected above this) |
| 30 Apr 2025, 11:54 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Mar 2025, 10:53 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Feb 2025, 13:52 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Jan 2025, 16:05 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Nov 2024, 13:43 | <0.03 | below 0.03 mg/l (not detected above this) |
| 29 Oct 2024, 12:31 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Sep 2024, 11:00 | 0.03 | 0.03 mg/l |
| 6 Aug 2024, 10:31 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Jul 2024, 13:34 | <0.03 | below 0.03 mg/l (not detected above this) |
| 25 Jun 2024, 13:28 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 May 2024, 12:49 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Apr 2024, 12:53 | <0.03 | below 0.03 mg/l (not detected above this) |
| 27 Mar 2024, 13:18 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Jan 2024, 09:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Nov 2023, 09:29 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Oct 2023, 10:29 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
4.79 mg/l
Sampled 22 Jun 2026, 3 months ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 22 Jun 2026, 10:33 | 4.79 | 4.79 mg/l |
| 8 May 2026, 11:50 | 6.49 | 6.49 mg/l |
| 20 Apr 2026, 14:46 | 6.89 | 6.89 mg/l |
| 1 Dec 2025, 19:19 | 7.39 | 7.39 mg/l |
| 12 Nov 2025, 10:17 | 5.2 | 5.2 mg/l |
| 23 Oct 2025, 10:57 | 6.49 | 6.49 mg/l |
| 11 Sep 2025, 13:47 | 6.19 | 6.19 mg/l |
| 13 Aug 2025, 13:33 | 5.29 | 5.29 mg/l |
| 24 Jul 2025, 08:07 | 6.19 | 6.19 mg/l |
| 26 Jun 2025, 13:18 | 6.09 | 6.09 mg/l |
| 27 May 2025, 11:28 | 6.89 | 6.89 mg/l |
| 30 Apr 2025, 11:54 | 6.29 | 6.29 mg/l |
| 13 Mar 2025, 10:53 | 7.09 | 7.09 mg/l |
| 12 Feb 2025, 13:52 | 6.98 | 6.98 mg/l |
| 14 Jan 2025, 16:05 | 7.38 | 7.38 mg/l |
| 13 Nov 2024, 13:43 | 6.99 | 6.99 mg/l |
| 29 Oct 2024, 12:31 | 5.39 | 5.39 mg/l |
| 23 Sep 2024, 11:00 | 4.09 | 4.09 mg/l |
| 6 Aug 2024, 10:31 | 5.89 | 5.89 mg/l |
| 18 Jul 2024, 13:34 | 5.79 | 5.79 mg/l |
| 25 Jun 2024, 13:28 | 6.59 | 6.59 mg/l |
| 20 May 2024, 12:49 | 7.19 | 7.19 mg/l |
| 22 Apr 2024, 12:53 | 7.49 | 7.49 mg/l |
| 27 Mar 2024, 13:18 | 7.19 | 7.19 mg/l |
| 24 Jan 2024, 09:39 | 7.57 | 7.57 mg/l |
| 23 Nov 2023, 09:29 | 5.89 | 5.89 mg/l |
| 12 Oct 2023, 10:29 | 4.59 | 4.59 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.14 mg/l
Sampled 22 Jun 2026, 3 months ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 22 Jun 2026, 10:33 | 0.14 | 0.14 mg/l |
| 8 May 2026, 11:50 | 0.11 | 0.11 mg/l |
| 20 Apr 2026, 14:46 | 0.071 | 0.071 mg/l |
| 1 Dec 2025, 19:19 | 0.12 | 0.12 mg/l |
| 12 Nov 2025, 10:17 | 0.24 | 0.24 mg/l |
| 23 Oct 2025, 10:57 | 0.26 | 0.26 mg/l |
| 11 Sep 2025, 13:47 | 0.21 | 0.21 mg/l |
| 13 Aug 2025, 13:33 | 0.14 | 0.14 mg/l |
| 24 Jul 2025, 08:07 | 0.21 | 0.21 mg/l |
| 26 Jun 2025, 13:18 | 0.16 | 0.16 mg/l |
| 27 May 2025, 11:28 | 0.14 | 0.14 mg/l |
| 30 Apr 2025, 11:54 | 0.11 | 0.11 mg/l |
| 13 Mar 2025, 10:53 | 0.092 | 0.092 mg/l |
| 12 Feb 2025, 13:52 | 0.076 | 0.076 mg/l |
| 14 Jan 2025, 16:05 | 0.068 | 0.068 mg/l |
| 13 Nov 2024, 13:43 | 0.089 | 0.089 mg/l |
| 29 Oct 2024, 12:31 | 0.062 | 0.062 mg/l |
| 23 Sep 2024, 11:00 | 0.13 | 0.13 mg/l |
| 6 Aug 2024, 10:31 | 0.16 | 0.16 mg/l |
| 18 Jul 2024, 13:34 | 0.16 | 0.16 mg/l |
| 25 Jun 2024, 13:28 | 0.13 | 0.13 mg/l |
| 20 May 2024, 12:49 | 0.12 | 0.12 mg/l |
| 22 Apr 2024, 12:53 | 0.076 | 0.076 mg/l |
| 27 Mar 2024, 13:18 | 0.071 | 0.071 mg/l |
| 24 Jan 2024, 09:39 | 0.11 | 0.11 mg/l |
| 23 Nov 2023, 09:29 | 0.091 | 0.091 mg/l |
| 12 Oct 2023, 10:29 | 0.2 | 0.2 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
686 µS/cm
Sampled 22 Jun 2026, 3 months ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 22 Jun 2026, 10:33 | 686 | 686 µS/cm |
| 8 May 2026, 11:50 | 679 | 679 µS/cm |
| 20 Apr 2026, 14:46 | 667 | 667 µS/cm |
| 7 Apr 2026, 10:23 | 677 | 677 µS/cm |
| 1 Dec 2025, 19:19 | 659 | 659 µS/cm |
| 12 Nov 2025, 10:17 | 731 | 731 µS/cm |
| 23 Oct 2025, 10:57 | 764 | 764 µS/cm |
| 11 Sep 2025, 13:47 | 722 | 722 µS/cm |
| 13 Aug 2025, 13:33 | 749 | 749 µS/cm |
| 24 Jul 2025, 08:07 | 741 | 741 µS/cm |
| 26 Jun 2025, 13:18 | 717 | 717 µS/cm |
| 27 May 2025, 11:28 | 692 | 692 µS/cm |
| 30 Apr 2025, 11:54 | 658 | 658 µS/cm |
| 13 Mar 2025, 10:53 | 648 | 648 µS/cm |
| 12 Feb 2025, 13:52 | 618 | 618 µS/cm |
| 14 Jan 2025, 16:05 | 630 | 630 µS/cm |
| 13 Nov 2024, 13:43 | 680 | 680 µS/cm |
| 29 Oct 2024, 12:31 | 623 | 623 µS/cm |
| 23 Sep 2024, 11:00 | 414 | 414 µS/cm |
| 6 Aug 2024, 10:31 | 703 | 703 µS/cm |
| 18 Jul 2024, 13:34 | 658 | 658 µS/cm |
| 25 Jun 2024, 13:28 | 690 | 690 µS/cm |
| 20 May 2024, 12:49 | 673 | 673 µS/cm |
| 22 Apr 2024, 12:53 | 649 | 649 µS/cm |
| 27 Mar 2024, 13:18 | 629 | 629 µS/cm |
| 24 Jan 2024, 09:39 | 638 | 638 µS/cm |
| 23 Nov 2023, 09:29 | 629 | 629 µS/cm |
| 12 Oct 2023, 10:29 | 758 | 758 µS/cm |
Everything measured here
182 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 182 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 28 | Oct 2023 – Jun 2026 | 101.4% 22 Jun 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 28 | Oct 2023 – Jun 2026 | 8.93 mg/l 22 Jun 2026 |
| Temperature of Water 0076 | River water | 28 | Oct 2023 – Jun 2026 | 21.5 °C 22 Jun 2026 |
| pH 0061 | River water | 28 | Oct 2023 – Jun 2026 | 8.14 22 Jun 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 27 | Oct 2023 – Jun 2026 | below 0.03 mg/l 22 Jun 2026 |
| Nitrate as N 0117 | River water | 27 | Oct 2023 – Jun 2026 | 4.79 mg/l 22 Jun 2026 |
| Orthophosphate, reactive as P 0180 | River water | 27 | Oct 2023 – Jun 2026 | 0.14 mg/l 22 Jun 2026 |
| Conductivity at 25 C 0077 | River water | 28 | Oct 2023 – Jun 2026 | 686 µS/cm 22 Jun 2026 |
| (Perfluorohexanesulfonyl)[3-(trimethylazaniumyl)propyl]azanide 2890 | River water | 2 | May 2026 – Jun 2026 | below 0.0005 µg/l 22 Jun 2026 |
| 10:2 Fluorotelomer sulfonic acid 2994 | River water | 2 | May 2026 – Jun 2026 | below 0.002 µg/l 22 Jun 2026 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 4 | Jan 2024 – Jun 2026 | below 0.001 µg/l 22 Jun 2026 |
| 2,3,6-TBA :- {2,3,6-Trichlorobenzoic acid} 7726 | River water | 24 | Oct 2023 – Dec 2025 | below 0.02 µg/l 1 Dec 2025 |
| 2,4,5-T :- {2,4,5-Trichlorophenoxyacetic acid} 3546 | River water | 24 | Oct 2023 – Dec 2025 | below 0.005 µg/l 1 Dec 2025 |
| 2,4-D :- {2,4-Dichlorophenoxyacetic acid} 3545 | River water | 24 | Oct 2023 – Dec 2025 | below 0.005 µg/l 1 Dec 2025 |
| 2,4-DB :- {4-(2,4-dichlorophenoxy)butyric acid} 3791 | River water | 24 | Oct 2023 – Dec 2025 | below 0.005 µg/l 1 Dec 2025 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 3 | Jan 2024 – Jun 2026 | below 0.001 µg/l 22 Jun 2026 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 4 | Jan 2024 – Jun 2026 | below 0.001 µg/l 22 Jun 2026 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 4 | Jan 2024 – Jun 2026 | below 0.0005 µg/l 22 Jun 2026 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 4 | Jan 2024 – Jun 2026 | below 0.0005 µg/l 22 Jun 2026 |
| 2-Phenoxypropionic acid :- {PPA} 6673 | River water | 24 | Oct 2023 – Dec 2025 | below 0.005 µg/l 1 Dec 2025 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 4 | Jan 2024 – Jun 2026 | below 0.001 µg/l 22 Jun 2026 |
| 2H-Perfluoro-2-decenoic acid 2888 | River water | 2 | May 2026 – Jun 2026 | below 0.001 µg/l 22 Jun 2026 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 4 | Jan 2024 – Jun 2026 | below 0.0005 µg/l 22 Jun 2026 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 4 | Jan 2024 – Jun 2026 | below 0.004 µg/l 22 Jun 2026 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 4 | Jan 2024 – Jun 2026 | below 0.001 µg/l 22 Jun 2026 |
| 4-Chloro-2-methylphenol :- {p-Chloro-o-cresol} 3341 | River water | 23 | Oct 2023 – Dec 2025 | below 0.05 µg/l 1 Dec 2025 |
| 4-Chlorophenoxyacetic acid 3547 | River water | 24 | Oct 2023 – Dec 2025 | below 0.005 µg/l 1 Dec 2025 |
| 4-Nonylphenol Branched 9190 | River water | 21 | Mar 2024 – Dec 2025 | below 0.04 µg/l 1 Dec 2025 |
| 4-Phenoxybutyric acid :- {PBA} 6672 | River water | 24 | Oct 2023 – Dec 2025 | below 0.005 µg/l 1 Dec 2025 |
| 4-tert-Octylphenol :- {p-tert-Octylphenol} 9267 | River water | 21 | Mar 2024 – Dec 2025 | below 0.01 µg/l 1 Dec 2025 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 4 | Jan 2024 – Jun 2026 | below 0.0005 µg/l 22 Jun 2026 |
| 5:1:2 Fluorotelomer betaine 2887 | River water | 2 | May 2026 – Jun 2026 | below 0.0005 µg/l 22 Jun 2026 |
| 5:3 Fluorotelomer betaine 2886 | River water | 2 | May 2026 – Jun 2026 | below 0.0005 µg/l 22 Jun 2026 |
| 6:2 Fluorotelomer phosphate diester 2986 | River water | 2 | May 2026 – Jun 2026 | below 0.004 µg/l 22 Jun 2026 |
| 6:2 Fluorotelomer sulfonamide amine oxide (6:2 FTNO) (Capstone A) 2841 | River water | 2 | May 2026 – Jun 2026 | below 0.001 µg/l 22 Jun 2026 |
| 6:2 Fluorotelomer sulfonamide betaine 2985 | River water | 2 | May 2026 – Jun 2026 | below 0.001 µg/l 22 Jun 2026 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 4 | Jan 2024 – Jun 2026 | below 0.001 µg/l 22 Jun 2026 |
| 6:2/8:2 Fluorotelomer phosphate diester 2884 | River water | 2 | May 2026 – Jun 2026 | below 0.01 µg/l 22 Jun 2026 |
| 6:6 Perfluorophosphinic acid 2883 | River water | 2 | May 2026 – Jun 2026 | below 0.004 µg/l 22 Jun 2026 |
| 6:8 Perfluorophosphinic acid 2882 | River water | 2 | May 2026 – Jun 2026 | below 0.01 µg/l 22 Jun 2026 |
| 8:2 Fluorotelomer phosphate diester 2880 | River water | 2 | May 2026 – Jun 2026 | below 0.004 µg/l 22 Jun 2026 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 4 | Jan 2024 – Jun 2026 | below 0.001 µg/l 22 Jun 2026 |
| 8:8 Perfluorophosphinic acid 2879 | River water | 2 | May 2026 – Jun 2026 | below 0.01 µg/l 22 Jun 2026 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 4 | Jan 2024 – Jun 2026 | below 0.0005 µg/l 22 Jun 2026 |
| Aldicarb 9344 | River water | 26 | Oct 2023 – Jun 2026 | below 0.005 µg/l 22 Jun 2026 |
| Aldicarb sulfoxide 8806 | River water | 27 | Oct 2023 – Jun 2026 | below 0.005 µg/l 22 Jun 2026 |
| Aldoxycarb :- {Aldicarb Sulfone} 8807 | River water | 26 | Oct 2023 – Jun 2026 | below 0.005 µg/l 22 Jun 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 27 | Oct 2023 – Jun 2026 | 230 mg/l 22 Jun 2026 |
| Aluminium, Dissolved 6037 | River water | 27 | Oct 2023 – Jun 2026 | below 20 µg/l 22 Jun 2026 |
| Aminomethylphosphonic acid 7125 | River water | 23 | Apr 2024 – Jun 2026 | 0.45 µg/l 22 Jun 2026 |
| Ammonia un-ionised as N 0119 | River water | 27 | Oct 2023 – Jun 2026 | below 0.00126 mg/l 22 Jun 2026 |
| Asulam 3004 | River water | 27 | Oct 2023 – Jun 2026 | below 0.02 µg/l 22 Jun 2026 |
| Azoxystrobin 5050 | River water | 27 | Oct 2023 – Jun 2026 | below 0.02 µg/l 22 Jun 2026 |
| Barium, Dissolved 9446 | River water | 27 | Oct 2023 – Jun 2026 | 12 µg/l 22 Jun 2026 |
| Benazolin 3792 | River water | 24 | Oct 2023 – Dec 2025 | below 0.005 µg/l 1 Dec 2025 |
| Bentazone 4065 | River water | 24 | Oct 2023 – Dec 2025 | 0.0055 µg/l 1 Dec 2025 |
| Benzo(a)Pyrene 6399 | River water | 26 | Oct 2023 – Jun 2026 | 0.0017 µg/l 22 Jun 2026 |
| Benzo(b)Fluoranthene 0731 | River water | 25 | Oct 2023 – Jun 2026 | 0.0015 µg/l 22 Jun 2026 |
| Benzo(g,h,i)Perylene 0714 | River water | 26 | Oct 2023 – Jun 2026 | 0.0017 µg/l 22 Jun 2026 |
| Benzo(k)Fluoranthene 0733 | River water | 26 | Oct 2023 – Jun 2026 | 0.00073 µg/l 22 Jun 2026 |
| Boron, Dissolved 9447 | River water | 27 | Oct 2023 – Jun 2026 | below 100 µg/l 22 Jun 2026 |
| Bromoxynil 6449 | River water | 23 | Nov 2023 – Dec 2025 | below 0.005 µg/l 1 Dec 2025 |
| Cadmium, Dissolved 0106 | River water | 27 | Oct 2023 – Jun 2026 | below 0.01 µg/l 22 Jun 2026 |
| Calcium, Dissolved 0239 | River water | 27 | Oct 2023 – Jun 2026 | 110 mg/l 22 Jun 2026 |
| Carbaryl 9343 | River water | 27 | Oct 2023 – Jun 2026 | below 0.01 µg/l 22 Jun 2026 |
| Carbendazim 3475 | River water | 27 | Oct 2023 – Jun 2026 | below 0.01 µg/l 22 Jun 2026 |
| Carbetamide 9073 | River water | 27 | Oct 2023 – Jun 2026 | below 0.01 µg/l 22 Jun 2026 |
| Carbofuran 3086 | River water | 25 | Oct 2023 – Jun 2026 | below 0.005 µg/l 22 Jun 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 27 | Oct 2023 – Jun 2026 | 3.3 mg/l 22 Jun 2026 |
| Chloridazon 6760 | River water | 27 | Oct 2023 – Jun 2026 | below 0.01 µg/l 22 Jun 2026 |
| Chloride 0172 | River water | 27 | Oct 2023 – Jun 2026 | 35 mg/l 22 Jun 2026 |
| Chlorotoluron 9348 | River water | 27 | Oct 2023 – Jun 2026 | below 0.01 µg/l 22 Jun 2026 |
| Chloroxuron 3399 | River water | 27 | Oct 2023 – Jun 2026 | below 0.01 µg/l 22 Jun 2026 |
| Chromium, Dissolved 3409 | River water | 27 | Oct 2023 – Jun 2026 | below 0.5 µg/l 22 Jun 2026 |
| cis-Permethrin 9341 | River water | 21 | Oct 2023 – Jun 2026 | below 0.0001 µg/l 22 Jun 2026 |
| Clopyralid 6620 | River water | 23 | Oct 2023 – Dec 2025 | below 0.005 µg/l 1 Dec 2025 |
| Copper : BLM Bioavailable 4821 | River water | 27 | Oct 2023 – Jun 2026 | 0.15 µg/l 22 Jun 2026 |
| Copper, Dissolved 6450 | River water | 27 | Oct 2023 – Jun 2026 | 1.1 µg/l 22 Jun 2026 |
| Cypermethrin 0073 | River water | 23 | Oct 2023 – Jun 2026 | below 0.00001 µg/l 22 Jun 2026 |
| Cypermethrin Identification 5446 | River water | 23 | Oct 2023 – Jun 2026 | 1 text result 22 Jun 2026 |
| Di(2-ethylhexyl) phthalate :- {DEHP} 6724 | River water | 20 | Apr 2024 – Dec 2025 | below 0.2 µg/l 1 Dec 2025 |
| Dicamba 3550 | River water | 22 | Oct 2023 – Dec 2025 | below 0.01 µg/l 1 Dec 2025 |
| Dichlorprop :- {2,4-DP} 3551 | River water | 24 | Oct 2023 – Dec 2025 | below 0.005 µg/l 1 Dec 2025 |
| Diflurobenzuron 9345 | River water | 27 | Oct 2023 – Jun 2026 | below 0.01 µg/l 22 Jun 2026 |
| Diuron 3811 | River water | 27 | Oct 2023 – Jun 2026 | below 0.01 µg/l 22 Jun 2026 |
| Ethiofencarb 6955 | River water | 27 | Oct 2023 – Jun 2026 | below 0.005 µg/l 22 Jun 2026 |
| Ethirimol 5047 | River water | 27 | Oct 2023 – Jun 2026 | below 0.05 µg/l 22 Jun 2026 |
| Fenoprop 3552 | River water | 24 | Oct 2023 – Dec 2025 | below 0.005 µg/l 1 Dec 2025 |
| Fenuron 9339 | River water | 27 | Oct 2023 – Jun 2026 | below 0.01 µg/l 22 Jun 2026 |
| Flow Type 2896 | River water | 21 | Jul 2024 – Jun 2026 | Moderate Flow 22 Jun 2026 |
| Fluoranthene 0736 | River water | 24 | Oct 2023 – Jun 2026 | 0.0027 µg/l 22 Jun 2026 |
| Fluroxypyr 4064 | River water | 24 | Oct 2023 – Dec 2025 | below 0.005 µg/l 1 Dec 2025 |
| GCMS Screen : Target Based multi-residue screening : Semi Quantitative 4994 | River water | 24 | Oct 2023 – Dec 2025 | 1 text result 1 Dec 2025 |
| Glyphosate 3007 | River water | 23 | Apr 2024 – Jun 2026 | below 0.1 µg/l 22 Jun 2026 |
| Hardness, Calcium 0163 | River water | 27 | Oct 2023 – Jun 2026 | 275 mg/l 22 Jun 2026 |
| Hardness, Total as CaCO3 0158 | River water | 27 | Oct 2023 – Jun 2026 | 301 mg/l 22 Jun 2026 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 4 | Jan 2024 – Jun 2026 | below 0.001 µg/l 22 Jun 2026 |
| Hexafluoropropylene oxide trimer acid 2980 | River water | 2 | May 2026 – Jun 2026 | below 0.001 µg/l 22 Jun 2026 |
| Imazapyr 7025 | River water | 24 | Oct 2023 – Dec 2025 | below 0.005 µg/l 1 Dec 2025 |
| Indeno(1,2,3-cd)pyrene 0746 | River water | 25 | Oct 2023 – Jun 2026 | 0.0016 µg/l 22 Jun 2026 |
| Ioxynil 9068 | River water | 24 | Oct 2023 – Dec 2025 | below 0.005 µg/l 1 Dec 2025 |
| Iron, Dissolved 6460 | River water | 27 | Oct 2023 – Jun 2026 | below 30 µg/l 22 Jun 2026 |
| Isoproturon 3117 | River water | 24 | Oct 2023 – Dec 2025 | below 0.01 µg/l 1 Dec 2025 |
| Lead : BLM Bioavailable 3377 | River water | 27 | Oct 2023 – Jun 2026 | 0.02 µg/l 22 Jun 2026 |
| Lead, Dissolved 0052 | River water | 27 | Oct 2023 – Jun 2026 | below 0.1 µg/l 22 Jun 2026 |
| Linuron 3118 | River water | 27 | Oct 2023 – Jun 2026 | below 0.01 µg/l 22 Jun 2026 |
| Lithium, Dissolved 4201 | River water | 27 | Oct 2023 – Jun 2026 | below 100 µg/l 22 Jun 2026 |
| Magnesium, Dissolved 0235 | River water | 27 | Oct 2023 – Jun 2026 | 6.5 mg/l 22 Jun 2026 |
| Manganese : BLM Bioavailable 4820 | River water | 27 | Oct 2023 – Jun 2026 | 3.7 µg/l 22 Jun 2026 |
| Manganese, Dissolved 6458 | River water | 27 | Oct 2023 – Jun 2026 | below 10 µg/l 22 Jun 2026 |
| MCPA :- {4-Chloro-2-methylphenoxyacetic acid} 3548 | River water | 24 | Oct 2023 – Dec 2025 | below 0.005 µg/l 1 Dec 2025 |
| MCPB :- {4-Chloro-2-methylphenoxybutyric acid} 3790 | River water | 23 | Nov 2023 – Dec 2025 | below 0.005 µg/l 1 Dec 2025 |
| Mecoprop 3549 | River water | 23 | Oct 2023 – Dec 2025 | below 0.005 µg/l 1 Dec 2025 |
| Methabenzthiazuron 7053 | River water | 26 | Oct 2023 – Jun 2026 | below 0.01 µg/l 22 Jun 2026 |
| Methiocarb 6971 | River water | 27 | Oct 2023 – Jun 2026 | below 0.001 µg/l 22 Jun 2026 |
| Methomyl 6972 | River water | 27 | Oct 2023 – Jun 2026 | below 0.005 µg/l 22 Jun 2026 |
| Metoxuron 3130 | River water | 27 | Oct 2023 – Jun 2026 | below 0.01 µg/l 22 Jun 2026 |
| Metsulfuron-methyl 9861 | River water | 27 | Oct 2023 – Jun 2026 | below 0.01 µg/l 22 Jun 2026 |
| Monolinuron 3925 | River water | 26 | Oct 2023 – Jun 2026 | below 0.01 µg/l 22 Jun 2026 |
| Monuron 3400 | River water | 27 | Oct 2023 – Jun 2026 | below 0.01 µg/l 22 Jun 2026 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 4 | Jan 2024 – Jun 2026 | below 0.002 µg/l 22 Jun 2026 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 4 | Jan 2024 – Jun 2026 | below 0.002 µg/l 22 Jun 2026 |
| Neburon 9756 | River water | 27 | Oct 2023 – Jun 2026 | below 0.01 µg/l 22 Jun 2026 |
| Nickel : BLM Bioavailable 3878 | River water | 27 | Oct 2023 – Jun 2026 | 0.76 µg/l 22 Jun 2026 |
| Nickel, Dissolved 3410 | River water | 27 | Oct 2023 – Jun 2026 | 1.4 µg/l 22 Jun 2026 |
| Nitrite as N 0118 | River water | 27 | Oct 2023 – Jun 2026 | 0.0093 mg/l 22 Jun 2026 |
| Nitrogen, Total as N 9686 | River water | 27 | Oct 2023 – Jun 2026 | 5.3 mg/l 22 Jun 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 27 | Oct 2023 – Jun 2026 | 4.8 mg/l 22 Jun 2026 |
| Oxamyl 6980 | River water | 27 | Oct 2023 – Jun 2026 | below 0.005 µg/l 22 Jun 2026 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 4 | Jan 2024 – Jun 2026 | below 0.0005 µg/l 22 Jun 2026 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 3 | Jan 2025 – Jun 2026 | below 0.0005 µg/l 22 Jun 2026 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 4 | Jan 2024 – Jun 2026 | below 0.0005 µg/l 22 Jun 2026 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 3 | Jan 2025 – Jun 2026 | below 0.0005 µg/l 22 Jun 2026 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 4 | Jan 2024 – Jun 2026 | below 0.0005 µg/l 22 Jun 2026 |
| Perfluorobutanesulfonic acid 2972 | River water | 4 | Jan 2024 – Jun 2026 | 0.0037 µg/l 22 Jun 2026 |
| Perfluorobutanoic acid 2995 | River water | 4 | Jan 2024 – Jun 2026 | 0.0023 µg/l 22 Jun 2026 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 4 | Jan 2024 – Jun 2026 | 0.00087 µg/l 22 Jun 2026 |
| Perfluorodecanesulfonic acid 2969 | River water | 4 | Jan 2024 – Jun 2026 | below 0.001 µg/l 22 Jun 2026 |
| Perfluorodecanoic acid 8892 | River water | 4 | Jan 2024 – Jun 2026 | below 0.001 µg/l 22 Jun 2026 |
| Perfluorododecane sulfonic acid 2968 | River water | 4 | Jan 2024 – Jun 2026 | below 0.005 µg/l 22 Jun 2026 |
| Perfluorododecanoic acid 8894 | River water | 4 | Jan 2024 – Jun 2026 | below 0.002 µg/l 22 Jun 2026 |
| Perfluoroheptanesulfonic acid 2967 | River water | 4 | Jan 2024 – Jun 2026 | below 0.0005 µg/l 22 Jun 2026 |
| Perfluoroheptanoic acid 8889 | River water | 4 | Jan 2024 – Jun 2026 | 0.0012 µg/l 22 Jun 2026 |
| Perfluorohexane sulfonamido amine 2874 | River water | 2 | May 2026 – Jun 2026 | below 0.0005 µg/l 22 Jun 2026 |
| Perfluorohexanesulfonamide 2965 | River water | 4 | Jan 2024 – Jun 2026 | below 0.0005 µg/l 22 Jun 2026 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 4 | Jan 2024 – Jun 2026 | 0.0017 µg/l 22 Jun 2026 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 4 | Jan 2024 – Jun 2026 | 0.0067 µg/l 22 Jun 2026 |
| Perfluorohexanoic acid 8888 | River water | 4 | Jan 2024 – Jun 2026 | 0.0032 µg/l 22 Jun 2026 |
| Perfluorononanesulfonic acid 2963 | River water | 4 | Jan 2024 – Jun 2026 | below 0.0005 µg/l 22 Jun 2026 |
| Perfluorononanoic acid 8891 | River water | 4 | Jan 2024 – Jun 2026 | below 0.001 µg/l 22 Jun 2026 |
| Perfluorooctadecanoic acid 2962 | River water | 3 | Jan 2024 – Jun 2026 | below 0.002 µg/l 22 Jun 2026 |
| Perfluorooctanesulfonamide 2961 | River water | 4 | Jan 2024 – Jun 2026 | below 0.001 µg/l 22 Jun 2026 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 3 | Jan 2024 – May 2026 | 0.0019 µg/l 8 May 2026 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 3 | Jan 2024 – May 2026 | 0.0028 µg/l 8 May 2026 |
| Perfluorooctanesulfonic acid (total) 2958 | River water | 1 | May 2026 – May 2026 | 0.0047 µg/l 8 May 2026 |
| Perfluorooctanoate anion 9274 | River water | 26 | Nov 2023 – Jun 2026 | 0.0018 µg/l 22 Jun 2026 |
| Perfluorooctanoic acid 8890 | River water | 4 | Jan 2024 – Jun 2026 | 0.0026 µg/l 22 Jun 2026 |
| Perfluorooctylsulphonate anion 9276 | River water | 26 | Nov 2023 – Jun 2026 | 0.0044 µg/l 22 Jun 2026 |
| Perfluoropentanesulfonic acid 2957 | River water | 4 | Jan 2024 – Jun 2026 | below 0.0005 µg/l 22 Jun 2026 |
| Perfluoropentanoic acid 8887 | River water | 4 | Jan 2024 – Jun 2026 | 0.004 µg/l 22 Jun 2026 |
| Perfluorotetradecanoic acid 8895 | River water | 4 | Jan 2024 – Jun 2026 | below 0.006 µg/l 22 Jun 2026 |
| Perfluorotridecanoic acid 2955 | River water | 4 | Jan 2024 – Jun 2026 | below 0.002 µg/l 22 Jun 2026 |
| Perfluoroundecane sulfonic acid 2953 | River water | 4 | Jan 2024 – Jun 2026 | below 0.004 µg/l 22 Jun 2026 |
| Perfluoroundecanoic acid 8893 | River water | 4 | Jan 2024 – Jun 2026 | below 0.001 µg/l 22 Jun 2026 |
| Phenoxyacetic acid :- {PAA} 6671 | River water | 24 | Oct 2023 – Dec 2025 | 0.03 µg/l 1 Dec 2025 |
| Phosphorus, Total as P 0348 | River water | 27 | Oct 2023 – Jun 2026 | 0.16 mg/l 22 Jun 2026 |
| Picloram 9883 | River water | 24 | Oct 2023 – Dec 2025 | below 0.005 µg/l 1 Dec 2025 |
| Potassium, Dissolved 0209 | River water | 27 | Oct 2023 – Jun 2026 | 5.1 mg/l 22 Jun 2026 |
| Propoxur 6987 | River water | 27 | Oct 2023 – Jun 2026 | below 0.005 µg/l 22 Jun 2026 |
| Silica, reactive as SiO2 0182 | River water | 27 | Oct 2023 – Jun 2026 | 7.4 mg/l 22 Jun 2026 |
| Sodium, Dissolved 0205 | River water | 27 | Oct 2023 – Jun 2026 | 26 mg/l 22 Jun 2026 |
| Solids, Suspended at 105 C 0135 | River water | 4 | Dec 2025 – Jun 2026 | 4.8 mg/l 22 Jun 2026 |
| Strontium, Filtered 6693 | River water | 27 | Oct 2023 – Jun 2026 | 260 µg/l 22 Jun 2026 |
| Sulcotrione 5042 | River water | 27 | Oct 2023 – Jun 2026 | below 0.1 µg/l 22 Jun 2026 |
| Sulphate, Dissolved as SO4 7859 | River water | 27 | Oct 2023 – Jun 2026 | 71 mg/l 22 Jun 2026 |
| trans-Permethrin 9342 | River water | 23 | Oct 2023 – Jun 2026 | below 0.0001 µg/l 22 Jun 2026 |
| Tributyl Tin as Cation 8944 | River water | 22 | Oct 2023 – Dec 2025 | 0.00003 µg/l 1 Dec 2025 |
| Triclopyr 3555 | River water | 24 | Oct 2023 – Dec 2025 | below 0.005 µg/l 1 Dec 2025 |
| Triclosan 5889 | River water | 20 | Apr 2024 – Dec 2025 | below 0.01 µg/l 1 Dec 2025 |
| Triphenyl Tin as Cation 5732 | River water | 21 | Oct 2023 – Dec 2025 | below 0.00002 µg/l 1 Dec 2025 |
| Zinc : BLM Bioavailable 4822 | River water | 27 | Oct 2023 – Jun 2026 | 0.6 µg/l 22 Jun 2026 |
| Zinc, Dissolved 3408 | River water | 27 | Oct 2023 – Jun 2026 | 1.3 µg/l 22 Jun 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.