Marston Meysey Brook at Roadbridge below Marston Meysey
EA name: MARSTON MEYSEY BROOK AT ROADBRIDGE BELOW (also listed as “MARSTON MEYSEY BROOK AT ROADBRIDGE BELOW MARSTON MEYSEY”)
Environment Agency sampling point TH-PUTR0227 · 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
- 10 Aug 2026, 11:5552 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 28 since 16 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 412800, 196400As published, to the nearest 100 m (so up to about 70 m out). Open in a map
- River, by its own name
- Marston Meysey Brook
- River, by the map
- Marston Meysey BrookPlaced on the river its name gives, 18 m from the line.
- Next gauge downstream
- Hannington Bridge On the River Thames · 6.7 km along the riverBeside Whetstone Bridge: too close to say above or below.
- Why it was sampled
- Monitoring (national agency policy) (23 samples)
Environmental monitoring statutory (EU directives) (5 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
94.6%
Sampled 10 Aug 2026, 52 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 11:55 | 94.6 | 94.6% |
| 9 Jul 2026, 10:47 | 94.7 | 94.7% |
| 10 Jun 2026, 13:15 | 101.9 | 101.9% |
| 12 May 2026, 13:11 | 97.8 | 97.8% |
| 13 Apr 2026, 14:19 | 106 | 106% |
| 3 Feb 2026, 12:31 | 90.4 | 90.4% |
| 9 Jan 2026, 09:56 | 89 | 89% |
| 10 Dec 2025, 12:32 | 85.2 | 85.2% |
| 4 Mar 2025, 11:13 | 98.9 | 98.9% |
| 6 Feb 2025, 13:46 | 98.4 | 98.4% |
| 22 Jan 2025, 10:28 | 98.1 | 98.1% |
| 16 Dec 2024, 09:17 | 92.9 | 92.9% |
| 26 Nov 2024, 10:19 | 83.6 | 83.6% |
| 14 Oct 2024, 11:25 | 89.5 | 89.5% |
| 18 Sep 2024, 11:18 | 94.3 | 94.3% |
| 21 Aug 2024, 13:37 | 99.7 | 99.7% |
| 15 Jul 2024, 12:55 | 96.9 | 96.9% |
| 18 Jun 2024, 10:13 | 95.7 | 95.7% |
| 20 May 2024, 11:59 | 98.8 | 98.8% |
| 16 Apr 2024, 09:44 | 96.3 | 96.3% |
| 22 Mar 2024, 13:04 | 96.7 | 96.7% |
| 23 Feb 2024, 10:09 | 91.6 | 91.6% |
| 15 Jan 2024, 09:07 | 95.3 | 95.3% |
| 11 Dec 2023, 10:19 | 88 | 88% |
| 27 Nov 2023, 09:20 | 89.5 | 89.5% |
| 30 Oct 2023, 10:19 | 88.5 | 88.5% |
| 16 Oct 2023, 14:23 | 92.4 | 92.4% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.7 mg/l
Sampled 10 Aug 2026, 52 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 11:55 | 9.7 | 9.7 mg/l |
| 9 Jul 2026, 10:47 | 9.74 | 9.74 mg/l |
| 10 Jun 2026, 13:15 | 11 | 11 mg/l |
| 12 May 2026, 13:11 | 10.8 | 10.8 mg/l |
| 13 Apr 2026, 14:19 | 11.8 | 11.8 mg/l |
| 3 Feb 2026, 12:31 | 10.7 | 10.7 mg/l |
| 9 Jan 2026, 09:56 | 11 | 11 mg/l |
| 10 Dec 2025, 12:32 | 9.71 | 9.71 mg/l |
| 4 Mar 2025, 11:13 | 12 | 12 mg/l |
| 6 Feb 2025, 13:46 | 11.8 | 11.8 mg/l |
| 22 Jan 2025, 10:28 | 11.7 | 11.7 mg/l |
| 16 Dec 2024, 09:17 | 10.5 | 10.5 mg/l |
| 26 Nov 2024, 10:19 | 9.86 | 9.86 mg/l |
| 14 Oct 2024, 11:25 | 9.94 | 9.94 mg/l |
| 18 Sep 2024, 11:18 | 10 | 10 mg/l |
| 21 Aug 2024, 13:37 | 10.5 | 10.5 mg/l |
| 15 Jul 2024, 12:55 | 10.3 | 10.3 mg/l |
| 18 Jun 2024, 10:13 | 10.3 | 10.3 mg/l |
| 20 May 2024, 11:59 | 10.4 | 10.4 mg/l |
| 16 Apr 2024, 09:44 | 10.9 | 10.9 mg/l |
| 22 Mar 2024, 13:04 | 10.8 | 10.8 mg/l |
| 23 Feb 2024, 10:09 | 11 | 11 mg/l |
| 15 Jan 2024, 09:07 | 11.7 | 11.7 mg/l |
| 11 Dec 2023, 10:19 | 10.2 | 10.2 mg/l |
| 27 Nov 2023, 09:20 | 10.2 | 10.2 mg/l |
| 30 Oct 2023, 10:19 | 9.65 | 9.65 mg/l |
| 16 Oct 2023, 14:23 | 10.2 | 10.2 mg/l |
Water temperature
code 0076 · °C
14.1 °C
Sampled 10 Aug 2026, 52 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 11:55 | 14.1 | 14.1 °C |
| 9 Jul 2026, 10:47 | 14 | 14 °C |
| 10 Jun 2026, 13:15 | 11.9 | 11.9 °C |
| 12 May 2026, 13:11 | 10.7 | 10.7 °C |
| 13 Apr 2026, 14:19 | 10.5 | 10.5 °C |
| 3 Feb 2026, 12:31 | 7.9 | 7.9 °C |
| 9 Jan 2026, 09:56 | 6.1 | 6.1 °C |
| 10 Dec 2025, 12:32 | 9.5 | 9.5 °C |
| 4 Mar 2025, 11:13 | 7.1 | 7.1 °C |
| 6 Feb 2025, 13:46 | 7.6 | 7.6 °C |
| 22 Jan 2025, 10:28 | 7.5 | 7.5 °C |
| 16 Dec 2024, 09:17 | 9.8 | 9.8 °C |
| 26 Nov 2024, 10:19 | 8.1 | 8.1 °C |
| 14 Oct 2024, 11:25 | 10.6 | 10.6 °C |
| 18 Sep 2024, 11:18 | 12.4 | 12.4 °C |
| 21 Aug 2024, 13:37 | 12.9 | 12.9 °C |
| 15 Jul 2024, 12:55 | 12.4 | 12.4 °C |
| 18 Jun 2024, 10:13 | 12 | 12 °C |
| 20 May 2024, 11:59 | 13.1 | 13.1 °C |
| 16 Apr 2024, 09:44 | 9.7 | 9.7 °C |
| 22 Mar 2024, 13:04 | 10.3 | 10.3 °C |
| 23 Feb 2024, 10:09 | 7.2 | 7.2 °C |
| 15 Jan 2024, 09:07 | 6.5 | 6.5 °C |
| 11 Dec 2023, 10:19 | 8.9 | 8.9 °C |
| 27 Nov 2023, 09:20 | 9.7 | 9.7 °C |
| 30 Oct 2023, 10:19 | 11.4 | 11.4 °C |
| 16 Oct 2023, 14:23 | 10.7 | 10.7 °C |
pH
code 0061
8.22
Sampled 10 Aug 2026, 52 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 11:55 | 8.22 | 8.22 |
| 9 Jul 2026, 10:47 | 8.18 | 8.18 |
| 10 Jun 2026, 13:15 | 8.23 | 8.23 |
| 12 May 2026, 13:11 | 8.41 | 8.41 |
| 13 Apr 2026, 14:19 | 8.18 | 8.18 |
| 3 Feb 2026, 12:31 | 7.85 | 7.85 |
| 9 Jan 2026, 09:56 | 7.89 | 7.89 |
| 10 Dec 2025, 12:32 | 7.87 | 7.87 |
| 4 Mar 2025, 11:13 | 8.05 | 8.05 |
| 6 Feb 2025, 13:46 | 8.08 | 8.08 |
| 22 Jan 2025, 10:28 | 8.09 | 8.09 |
| 16 Dec 2024, 09:17 | 8.06 | 8.06 |
| 26 Nov 2024, 10:19 | 7.76 | 7.76 |
| 14 Oct 2024, 11:25 | 7.85 | 7.85 |
| 18 Sep 2024, 11:18 | 8.09 | 8.09 |
| 21 Aug 2024, 13:37 | 8.2 | 8.2 |
| 15 Jul 2024, 12:55 | 8.04 | 8.04 |
| 18 Jun 2024, 10:13 | 8.06 | 8.06 |
| 20 May 2024, 11:59 | 8.04 | 8.04 |
| 16 Apr 2024, 09:44 | 8.06 | 8.06 |
| 22 Mar 2024, 13:04 | 8.24 | 8.24 |
| 23 Feb 2024, 10:09 | 7.94 | 7.94 |
| 15 Jan 2024, 09:07 | 8.15 | 8.15 |
| 11 Dec 2023, 10:19 | 7.84 | 7.84 |
| 27 Nov 2023, 09:20 | 7.95 | 7.95 |
| 30 Oct 2023, 10:19 | 7.79 | 7.79 |
| 16 Oct 2023, 14:23 | 8.01 | 8.01 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 10 Aug 2026, 52 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 11:55 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Jul 2026, 10:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Jun 2026, 13:15 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 May 2026, 13:11 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Apr 2026, 14:19 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Mar 2026, 12:23 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Feb 2026, 12:31 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Jan 2026, 09:56 | 0.038 | 0.038 mg/l |
| 10 Dec 2025, 12:32 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Mar 2025, 11:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Feb 2025, 13:46 | 0.052 | 0.052 mg/l |
| 22 Jan 2025, 10:28 | 0.033 | 0.033 mg/l |
| 16 Dec 2024, 09:17 | 0.031 | 0.031 mg/l |
| 26 Nov 2024, 10:19 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Oct 2024, 11:25 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Sep 2024, 11:18 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Aug 2024, 13:37 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Jul 2024, 12:55 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Jun 2024, 10:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 May 2024, 11:59 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Apr 2024, 09:44 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Mar 2024, 13:04 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Feb 2024, 10:09 | 0.036 | 0.036 mg/l |
| 15 Jan 2024, 09:07 | 0.044 | 0.044 mg/l |
| 11 Dec 2023, 10:19 | <0.03 | below 0.03 mg/l (not detected above this) |
| 27 Nov 2023, 09:20 | <0.03 | below 0.03 mg/l (not detected above this) |
| 30 Oct 2023, 10:19 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Oct 2023, 14:23 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
0.726 mg/l
Sampled 10 Aug 2026, 52 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 11:55 | 0.726 | 0.726 mg/l |
| 9 Jul 2026, 10:47 | 1.5 | 1.5 mg/l |
| 10 Jun 2026, 13:15 | 1.89 | 1.89 mg/l |
| 12 May 2026, 13:11 | 2.09 | 2.09 mg/l |
| 13 Apr 2026, 14:19 | 2.69 | 2.69 mg/l |
| 18 Mar 2026, 12:23 | 4.88 | 4.88 mg/l |
| 3 Feb 2026, 12:31 | 8.29 | 8.29 mg/l |
| 9 Jan 2026, 09:56 | 7.69 | 7.69 mg/l |
| 10 Dec 2025, 12:32 | 11 | 11 mg/l |
| 4 Mar 2025, 11:13 | 5.38 | 5.38 mg/l |
| 6 Feb 2025, 13:46 | 5.68 | 5.68 mg/l |
| 22 Jan 2025, 10:28 | 4.28 | 4.28 mg/l |
| 16 Dec 2024, 09:17 | 5.59 | 5.59 mg/l |
| 26 Nov 2024, 10:19 | 6.69 | 6.69 mg/l |
| 14 Oct 2024, 11:25 | 4.89 | 4.89 mg/l |
| 18 Sep 2024, 11:18 | 2.19 | 2.19 mg/l |
| 21 Aug 2024, 13:37 | 1.79 | 1.79 mg/l |
| 15 Jul 2024, 12:55 | 1.99 | 1.99 mg/l |
| 18 Jun 2024, 10:13 | 1.99 | 1.99 mg/l |
| 20 May 2024, 11:59 | 2.78 | 2.78 mg/l |
| 16 Apr 2024, 09:44 | 4.39 | 4.39 mg/l |
| 22 Mar 2024, 13:04 | 5.09 | 5.09 mg/l |
| 23 Feb 2024, 10:09 | 5.49 | 5.49 mg/l |
| 15 Jan 2024, 09:07 | 5.89 | 5.89 mg/l |
| 11 Dec 2023, 10:19 | 6.89 | 6.89 mg/l |
| 27 Nov 2023, 09:20 | 6.19 | 6.19 mg/l |
| 30 Oct 2023, 10:19 | 7.59 | 7.59 mg/l |
| 16 Oct 2023, 14:23 | 7.39 | 7.39 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.01 mg/l
Sampled 10 Aug 2026, 52 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 11:55 | 0.01 | 0.01 mg/l |
| 9 Jul 2026, 10:47 | <0.01 | below 0.01 mg/l (not detected above this) |
| 10 Jun 2026, 13:15 | <0.01 | below 0.01 mg/l (not detected above this) |
| 12 May 2026, 13:11 | <0.01 | below 0.01 mg/l (not detected above this) |
| 13 Apr 2026, 14:19 | 0.015 | 0.015 mg/l |
| 18 Mar 2026, 12:23 | <0.01 | below 0.01 mg/l (not detected above this) |
| 3 Feb 2026, 12:31 | 0.015 | 0.015 mg/l |
| 9 Jan 2026, 09:56 | 0.044 | 0.044 mg/l |
| 10 Dec 2025, 12:32 | 0.027 | 0.027 mg/l |
| 4 Mar 2025, 11:13 | <0.01 | below 0.01 mg/l (not detected above this) |
| 6 Feb 2025, 13:46 | 0.012 | 0.012 mg/l |
| 22 Jan 2025, 10:28 | 0.013 | 0.013 mg/l |
| 16 Dec 2024, 09:17 | 0.013 | 0.013 mg/l |
| 26 Nov 2024, 10:19 | 0.054 | 0.054 mg/l |
| 14 Oct 2024, 11:25 | 0.042 | 0.042 mg/l |
| 18 Sep 2024, 11:18 | <0.01 | below 0.01 mg/l (not detected above this) |
| 21 Aug 2024, 13:37 | <0.01 | below 0.01 mg/l (not detected above this) |
| 15 Jul 2024, 12:55 | <0.01 | below 0.01 mg/l (not detected above this) |
| 18 Jun 2024, 10:13 | <0.01 | below 0.01 mg/l (not detected above this) |
| 20 May 2024, 11:59 | <0.01 | below 0.01 mg/l (not detected above this) |
| 16 Apr 2024, 09:44 | <0.01 | below 0.01 mg/l (not detected above this) |
| 22 Mar 2024, 13:04 | <0.01 | below 0.01 mg/l (not detected above this) |
| 23 Feb 2024, 10:09 | 0.03 | 0.03 mg/l |
| 15 Jan 2024, 09:07 | 0.02 | 0.02 mg/l |
| 11 Dec 2023, 10:19 | 0.032 | 0.032 mg/l |
| 27 Nov 2023, 09:20 | 0.018 | 0.018 mg/l |
| 30 Oct 2023, 10:19 | 0.025 | 0.025 mg/l |
| 16 Oct 2023, 14:23 | 0.013 | 0.013 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
558 µS/cm
Sampled 10 Aug 2026, 52 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 10 Aug 2026, 11:55 | 558 | 558 µS/cm |
| 9 Jul 2026, 10:47 | 578 | 578 µS/cm |
| 10 Jun 2026, 13:15 | 594 | 594 µS/cm |
| 12 May 2026, 13:11 | 604 | 604 µS/cm |
| 13 Apr 2026, 14:19 | 606 | 606 µS/cm |
| 3 Feb 2026, 12:31 | 592 | 592 µS/cm |
| 9 Jan 2026, 09:56 | 502 | 502 µS/cm |
| 10 Dec 2025, 12:32 | 562 | 562 µS/cm |
| 4 Mar 2025, 11:13 | 632 | 632 µS/cm |
| 6 Feb 2025, 13:46 | 621 | 621 µS/cm |
| 22 Jan 2025, 10:28 | 619 | 619 µS/cm |
| 16 Dec 2024, 09:17 | 627 | 627 µS/cm |
| 26 Nov 2024, 10:19 | 556 | 556 µS/cm |
| 14 Oct 2024, 11:25 | 523 | 523 µS/cm |
| 18 Sep 2024, 11:18 | 601 | 601 µS/cm |
| 21 Aug 2024, 13:37 | 579 | 579 µS/cm |
| 15 Jul 2024, 12:55 | 604 | 604 µS/cm |
| 18 Jun 2024, 10:13 | 605 | 605 µS/cm |
| 20 May 2024, 11:59 | 616 | 616 µS/cm |
| 16 Apr 2024, 09:44 | 629 | 629 µS/cm |
| 22 Mar 2024, 13:04 | 625 | 625 µS/cm |
| 23 Feb 2024, 10:09 | 532 | 532 µS/cm |
| 15 Jan 2024, 09:07 | 624 | 624 µS/cm |
| 11 Dec 2023, 10:19 | 602 | 602 µS/cm |
| 27 Nov 2023, 09:20 | 644 | 644 µS/cm |
| 30 Oct 2023, 10:19 | 634 | 634 µS/cm |
| 16 Oct 2023, 14:23 | 641 | 641 µS/cm |
Everything measured here
60 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 60 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 27 | Oct 2023 – Aug 2026 | 94.6% 10 Aug 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 27 | Oct 2023 – Aug 2026 | 9.7 mg/l 10 Aug 2026 |
| Temperature of Water 0076 | River water | 27 | Oct 2023 – Aug 2026 | 14.1 °C 10 Aug 2026 |
| pH 0061 | River water | 27 | Oct 2023 – Aug 2026 | 8.22 10 Aug 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 28 | Oct 2023 – Aug 2026 | below 0.03 mg/l 10 Aug 2026 |
| Nitrate as N 0117 | River water | 28 | Oct 2023 – Aug 2026 | 0.726 mg/l 10 Aug 2026 |
| Orthophosphate, reactive as P 0180 | River water | 28 | Oct 2023 – Aug 2026 | 0.01 mg/l 10 Aug 2026 |
| Conductivity at 25 C 0077 | River water | 27 | Oct 2023 – Aug 2026 | 558 µS/cm 10 Aug 2026 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 2 | Jun 2024 – Nov 2024 | below 0.001 µg/l 26 Nov 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 2 | Jun 2024 – Nov 2024 | below 0.001 µg/l 26 Nov 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 2 | Jun 2024 – Nov 2024 | below 0.001 µg/l 26 Nov 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 2 | Jun 2024 – Nov 2024 | below 0.002 µg/l 26 Nov 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 2 | Jun 2024 – Nov 2024 | below 0.0005 µg/l 26 Nov 2024 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 2 | Jun 2024 – Nov 2024 | below 0.001 µg/l 26 Nov 2024 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 2 | Jun 2024 – Nov 2024 | below 0.0005 µg/l 26 Nov 2024 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 2 | Jun 2024 – Nov 2024 | below 0.004 µg/l 26 Nov 2024 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 2 | Jun 2024 – Nov 2024 | below 0.005 µg/l 26 Nov 2024 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 2 | Jun 2024 – Nov 2024 | below 0.0005 µg/l 26 Nov 2024 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 2 | Jun 2024 – Nov 2024 | 0.0045 µg/l 26 Nov 2024 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 2 | Jun 2024 – Nov 2024 | below 0.001 µg/l 26 Nov 2024 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 2 | Jun 2024 – Nov 2024 | below 0.0005 µg/l 26 Nov 2024 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 28 | Oct 2023 – Aug 2026 | 220 mg/l 10 Aug 2026 |
| Ammonia un-ionised as N 0119 | River water | 27 | Oct 2023 – Aug 2026 | below 0.00074 mg/l 10 Aug 2026 |
| BOD : 5 Day ATU 0085 | River water | 20 | Feb 2024 – May 2026 | 1.5 mg/l 12 May 2026 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 2 | Jun 2024 – Nov 2024 | below 0.001 µg/l 26 Nov 2024 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 2 | Jun 2024 – Nov 2024 | below 0.002 µg/l 26 Nov 2024 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 2 | Jun 2024 – Nov 2024 | below 0.002 µg/l 26 Nov 2024 |
| Nitrite as N 0118 | River water | 28 | Oct 2023 – Aug 2026 | below 0.004 mg/l 10 Aug 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 28 | Oct 2023 – Aug 2026 | 0.73 mg/l 10 Aug 2026 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 2 | Jun 2024 – Nov 2024 | below 0.0005 µg/l 26 Nov 2024 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 1 | Nov 2024 – Nov 2024 | below 0.0005 µg/l 26 Nov 2024 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 2 | Jun 2024 – Nov 2024 | below 0.0005 µg/l 26 Nov 2024 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 1 | Nov 2024 – Nov 2024 | below 0.0005 µg/l 26 Nov 2024 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 2 | Jun 2024 – Nov 2024 | below 0.0005 µg/l 26 Nov 2024 |
| Perfluorobutanesulfonic acid 2972 | River water | 2 | Jun 2024 – Nov 2024 | below 0.001 µg/l 26 Nov 2024 |
| Perfluorobutanoic acid 2995 | River water | 2 | Jun 2024 – Nov 2024 | 0.001 µg/l 26 Nov 2024 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 2 | Jun 2024 – Nov 2024 | below 0.0005 µg/l 26 Nov 2024 |
| Perfluorodecanesulfonic acid 2969 | River water | 2 | Jun 2024 – Nov 2024 | below 0.002 µg/l 26 Nov 2024 |
| Perfluorodecanoic acid 8892 | River water | 2 | Jun 2024 – Nov 2024 | below 0.002 µg/l 26 Nov 2024 |
| Perfluorododecane sulfonic acid 2968 | River water | 2 | Jun 2024 – Nov 2024 | below 0.005 µg/l 26 Nov 2024 |
| Perfluorododecanoic acid 8894 | River water | 2 | Jun 2024 – Nov 2024 | below 0.002 µg/l 26 Nov 2024 |
| Perfluoroheptanesulfonic acid 2967 | River water | 2 | Jun 2024 – Nov 2024 | below 0.0005 µg/l 26 Nov 2024 |
| Perfluoroheptanoic acid 8889 | River water | 2 | Jun 2024 – Nov 2024 | below 0.001 µg/l 26 Nov 2024 |
| Perfluorohexanesulfonamide 2965 | River water | 2 | Jun 2024 – Nov 2024 | below 0.0005 µg/l 26 Nov 2024 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 2 | Jun 2024 – Nov 2024 | below 0.0005 µg/l 26 Nov 2024 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 2 | Jun 2024 – Nov 2024 | 0.0011 µg/l 26 Nov 2024 |
| Perfluorohexanoic acid 8888 | River water | 2 | Jun 2024 – Nov 2024 | below 0.0005 µg/l 26 Nov 2024 |
| Perfluorononanesulfonic acid 2963 | River water | 2 | Jun 2024 – Nov 2024 | below 0.0005 µg/l 26 Nov 2024 |
| Perfluorononanoic acid 8891 | River water | 2 | Jun 2024 – Nov 2024 | below 0.001 µg/l 26 Nov 2024 |
| Perfluorooctadecanoic acid 2962 | River water | 2 | Jun 2024 – Nov 2024 | below 0.002 µg/l 26 Nov 2024 |
| Perfluorooctanesulfonamide 2961 | River water | 1 | Nov 2024 – Nov 2024 | below 0.001 µg/l 26 Nov 2024 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 2 | Jun 2024 – Nov 2024 | 0.00072 µg/l 26 Nov 2024 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 2 | Jun 2024 – Nov 2024 | 0.00069 µg/l 26 Nov 2024 |
| Perfluorooctanoic acid 8890 | River water | 2 | Jun 2024 – Nov 2024 | below 0.0005 µg/l 26 Nov 2024 |
| Perfluoropentanesulfonic acid 2957 | River water | 2 | Jun 2024 – Nov 2024 | below 0.0005 µg/l 26 Nov 2024 |
| Perfluoropentanoic acid 8887 | River water | 2 | Jun 2024 – Nov 2024 | below 0.001 µg/l 26 Nov 2024 |
| Perfluorotetradecanoic acid 8895 | River water | 2 | Jun 2024 – Nov 2024 | below 0.006 µg/l 26 Nov 2024 |
| Perfluorotridecanoic acid 2955 | River water | 2 | Jun 2024 – Nov 2024 | below 0.005 µg/l 26 Nov 2024 |
| Perfluoroundecane sulfonic acid 2953 | River water | 2 | Jun 2024 – Nov 2024 | below 0.004 µg/l 26 Nov 2024 |
| Perfluoroundecanoic acid 8893 | River water | 2 | Jun 2024 – Nov 2024 | below 0.002 µg/l 26 Nov 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.