Heythrop Park
EA name: HEYTHROP PARK (also listed as “RSN0626 HEYTHROP PARK”)
Environment Agency sampling point TH-RSN0626 · 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
- 27 Aug 2026, 10:3335 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 25 since 17 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 437366, 225545As 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
- An unnamed streamPlaced by position alone (the only river line close by), 4 m from the line.
- Next gauge downstream
- Woodstock On the River Glyme · 17 km along the river
- Why it was sampled
- Monitoring (national agency policy) (25 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
93.9%
Sampled 27 Aug 2026, 35 days ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 27 Aug 2026, 10:33 | 93.9 | 93.9% |
| 31 Jul 2026, 11:15 | 108.6 | 108.6% |
| 22 Jun 2026, 14:48 | 101.4 | 101.4% |
| 18 May 2026, 11:49 | 102.4 | 102.4% |
| 15 Apr 2026, 10:18 | 102.6 | 102.6% |
| 5 Mar 2026, 10:09 | 101.3 | 101.3% |
| 10 Feb 2026, 11:25 | 99.9 | 99.9% |
| 7 Jan 2026, 12:36 | 100.7 | 100.7% |
| 11 Mar 2025, 10:27 | 102.2 | 102.2% |
| 4 Feb 2025, 13:11 | 99.7 | 99.7% |
| 21 Jan 2025, 09:50 | 100.5 | 100.5% |
| 10 Dec 2024, 12:29 | 98.6 | 98.6% |
| 19 Nov 2024, 09:32 | 99.9 | 99.9% |
| 14 Oct 2024, 13:10 | 98.1 | 98.1% |
| 17 Sep 2024, 13:24 | 104.4 | 104.4% |
| 28 Aug 2024, 11:59 | 106.4 | 106.4% |
| 29 Jul 2024, 13:13 | 108.8 | 108.8% |
| 17 Jun 2024, 09:20 | 98.4 | 98.4% |
| 14 May 2024, 09:50 | 101.8 | 101.8% |
| 15 Apr 2024, 12:13 | 101.4 | 101.4% |
| 20 Feb 2024, 11:47 | 99.7 | 99.7% |
| 16 Jan 2024, 13:37 | 98.3 | 98.3% |
| 5 Dec 2023, 08:51 | 97.1 | 97.1% |
| 20 Nov 2023, 11:46 | 97.6 | 97.6% |
| 17 Oct 2023, 12:09 | 98.6 | 98.6% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.26 mg/l
Sampled 27 Aug 2026, 35 days ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 27 Aug 2026, 10:33 | 9.26 | 9.26 mg/l |
| 31 Jul 2026, 11:15 | 10.6 | 10.6 mg/l |
| 22 Jun 2026, 14:48 | 9.44 | 9.44 mg/l |
| 18 May 2026, 11:49 | 11.5 | 11.5 mg/l |
| 15 Apr 2026, 10:18 | 11.3 | 11.3 mg/l |
| 5 Mar 2026, 10:09 | 11.9 | 11.9 mg/l |
| 10 Feb 2026, 11:25 | 11.7 | 11.7 mg/l |
| 7 Jan 2026, 12:36 | 12.9 | 12.9 mg/l |
| 11 Mar 2025, 10:27 | 12.2 | 12.2 mg/l |
| 4 Feb 2025, 13:11 | 12 | 12 mg/l |
| 21 Jan 2025, 09:50 | 12.7 | 12.7 mg/l |
| 10 Dec 2024, 12:29 | 11.7 | 11.7 mg/l |
| 19 Nov 2024, 09:32 | 12.4 | 12.4 mg/l |
| 14 Oct 2024, 13:10 | 11 | 11 mg/l |
| 17 Sep 2024, 13:24 | 11 | 11 mg/l |
| 28 Aug 2024, 11:59 | 10.7 | 10.7 mg/l |
| 29 Jul 2024, 13:13 | 10.8 | 10.8 mg/l |
| 17 Jun 2024, 09:20 | 10.7 | 10.7 mg/l |
| 14 May 2024, 09:50 | 10.7 | 10.7 mg/l |
| 15 Apr 2024, 12:13 | 11.3 | 11.3 mg/l |
| 20 Feb 2024, 11:47 | 11.5 | 11.5 mg/l |
| 16 Jan 2024, 13:37 | 12.4 | 12.4 mg/l |
| 5 Dec 2023, 08:51 | 11.8 | 11.8 mg/l |
| 20 Nov 2023, 11:46 | 11 | 11 mg/l |
| 17 Oct 2023, 12:09 | 11.1 | 11.1 mg/l |
Water temperature
code 0076 · °C
15.9 °C
Sampled 27 Aug 2026, 35 days ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 27 Aug 2026, 10:33 | 15.9 | 15.9 °C |
| 31 Jul 2026, 11:15 | 16.4 | 16.4 °C |
| 22 Jun 2026, 14:48 | 18.7 | 18.7 °C |
| 18 May 2026, 11:49 | 10.3 | 10.3 °C |
| 15 Apr 2026, 10:18 | 11 | 11 °C |
| 5 Mar 2026, 10:09 | 8.1 | 8.1 °C |
| 10 Feb 2026, 11:25 | 8.5 | 8.5 °C |
| 7 Jan 2026, 12:36 | 4.9 | 4.9 °C |
| 11 Mar 2025, 10:27 | 7.5 | 7.5 °C |
| 4 Feb 2025, 13:11 | 7.3 | 7.3 °C |
| 21 Jan 2025, 09:50 | 5.5 | 5.5 °C |
| 10 Dec 2024, 12:29 | 8 | 8 °C |
| 19 Nov 2024, 09:32 | 6.2 | 6.2 °C |
| 14 Oct 2024, 13:10 | 10.1 | 10.1 °C |
| 17 Sep 2024, 13:24 | 13 | 13 °C |
| 28 Aug 2024, 11:59 | 14.8 | 14.8 °C |
| 29 Jul 2024, 13:13 | 15.5 | 15.5 °C |
| 17 Jun 2024, 09:20 | 11.5 | 11.5 °C |
| 14 May 2024, 09:50 | 13 | 13 °C |
| 15 Apr 2024, 12:13 | 10.6 | 10.6 °C |
| 20 Feb 2024, 11:47 | 9.1 | 9.1 °C |
| 16 Jan 2024, 13:37 | 5.3 | 5.3 °C |
| 5 Dec 2023, 08:51 | 6.9 | 6.9 °C |
| 20 Nov 2023, 11:46 | 9.8 | 9.8 °C |
| 17 Oct 2023, 12:09 | 10 | 10 °C |
pH
code 0061
8.1
Sampled 27 Aug 2026, 35 days ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 27 Aug 2026, 10:33 | 8.1 | 8.1 |
| 31 Jul 2026, 11:15 | 8.33 | 8.33 |
| 22 Jun 2026, 14:48 | 8.21 | 8.21 |
| 18 May 2026, 11:49 | 8.1 | 8.1 |
| 15 Apr 2026, 10:18 | 8.27 | 8.27 |
| 5 Mar 2026, 10:09 | 8.19 | 8.19 |
| 10 Feb 2026, 11:25 | 8.12 | 8.12 |
| 7 Jan 2026, 12:36 | 8.27 | 8.27 |
| 11 Mar 2025, 10:27 | 8.13 | 8.13 |
| 4 Feb 2025, 13:11 | 8.17 | 8.17 |
| 21 Jan 2025, 09:50 | 8.22 | 8.22 |
| 10 Dec 2024, 12:29 | 8.16 | 8.16 |
| 19 Nov 2024, 09:32 | 8.13 | 8.13 |
| 14 Oct 2024, 13:10 | 8.16 | 8.16 |
| 17 Sep 2024, 13:24 | 8.21 | 8.21 |
| 28 Aug 2024, 11:59 | 8.15 | 8.15 |
| 29 Jul 2024, 13:13 | 8.2 | 8.2 |
| 17 Jun 2024, 09:20 | 8.16 | 8.16 |
| 14 May 2024, 09:50 | 8.06 | 8.06 |
| 15 Apr 2024, 12:13 | 8.32 | 8.32 |
| 20 Feb 2024, 11:47 | 8.23 | 8.23 |
| 16 Jan 2024, 13:37 | 8.21 | 8.21 |
| 5 Dec 2023, 08:51 | 8.21 | 8.21 |
| 20 Nov 2023, 11:46 | 8.1 | 8.1 |
| 17 Oct 2023, 12:09 | 8.16 | 8.16 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.002 mg/l (not detected above this)
Sampled 27 Aug 2026, 35 days ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 27 Aug 2026, 10:33 | <0.002 | below 0.002 mg/l (not detected above this) |
| 31 Jul 2026, 11:15 | 0.0029 | 0.0029 mg/l |
| 22 Jun 2026, 14:48 | 0.0047 | 0.0047 mg/l |
| 18 May 2026, 11:49 | <0.002 | below 0.002 mg/l (not detected above this) |
| 15 Apr 2026, 10:18 | <0.002 | below 0.002 mg/l (not detected above this) |
| 5 Mar 2026, 10:09 | 0.0038 | 0.0038 mg/l |
| 10 Feb 2026, 11:25 | 0.011 | 0.011 mg/l |
| 7 Jan 2026, 12:36 | 0.0068 | 0.0068 mg/l |
| 11 Mar 2025, 10:27 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Feb 2025, 13:11 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Jan 2025, 09:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Dec 2024, 12:29 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Nov 2024, 09:32 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Oct 2024, 13:10 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Sep 2024, 13:24 | <0.03 | below 0.03 mg/l (not detected above this) |
| 28 Aug 2024, 11:59 | <0.03 | below 0.03 mg/l (not detected above this) |
| 29 Jul 2024, 13:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Jun 2024, 09:20 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 May 2024, 09:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Apr 2024, 12:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Feb 2024, 11:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Jan 2024, 13:37 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Dec 2023, 08:51 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Nov 2023, 11:46 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Oct 2023, 12:09 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
6.69 mg/l
Sampled 27 Aug 2026, 35 days ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 27 Aug 2026, 10:33 | 6.69 | 6.69 mg/l |
| 31 Jul 2026, 11:15 | 6.99 | 6.99 mg/l |
| 22 Jun 2026, 14:48 | 5.49 | 5.49 mg/l |
| 18 May 2026, 11:49 | 7.39 | 7.39 mg/l |
| 15 Apr 2026, 10:18 | 8.39 | 8.39 mg/l |
| 5 Mar 2026, 10:09 | 6.89 | 6.89 mg/l |
| 10 Feb 2026, 11:25 | 8.89 | 8.89 mg/l |
| 7 Jan 2026, 12:36 | 9.39 | 9.39 mg/l |
| 11 Mar 2025, 10:27 | 9.99 | 9.99 mg/l |
| 4 Feb 2025, 13:11 | 9.5 | 9.5 mg/l |
| 21 Jan 2025, 09:50 | 11 | 11 mg/l |
| 10 Dec 2024, 12:29 | 9.19 | 9.19 mg/l |
| 19 Nov 2024, 09:32 | 9.99 | 9.99 mg/l |
| 14 Oct 2024, 13:10 | 8.69 | 8.69 mg/l |
| 17 Sep 2024, 13:24 | 7.9 | 7.9 mg/l |
| 28 Aug 2024, 11:59 | 7.8 | 7.8 mg/l |
| 29 Jul 2024, 13:13 | 8.6 | 8.6 mg/l |
| 17 Jun 2024, 09:20 | 8.79 | 8.79 mg/l |
| 14 May 2024, 09:50 | 9.39 | 9.39 mg/l |
| 15 Apr 2024, 12:13 | 11 | 11 mg/l |
| 20 Feb 2024, 11:47 | 8.89 | 8.89 mg/l |
| 16 Jan 2024, 13:37 | 13 | 13 mg/l |
| 5 Dec 2023, 08:51 | 9.09 | 9.09 mg/l |
| 20 Nov 2023, 11:46 | 8.59 | 8.59 mg/l |
| 17 Oct 2023, 12:09 | 6.49 | 6.49 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.014 mg/l
Sampled 27 Aug 2026, 35 days ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 27 Aug 2026, 10:33 | 0.014 | 0.014 mg/l |
| 31 Jul 2026, 11:15 | 0.012 | 0.012 mg/l |
| 22 Jun 2026, 14:48 | 0.015 | 0.015 mg/l |
| 18 May 2026, 11:49 | 0.0046 | 0.0046 mg/l |
| 15 Apr 2026, 10:18 | 0.0031 | 0.0031 mg/l |
| 5 Mar 2026, 10:09 | 0.0075 | 0.0075 mg/l |
| 10 Feb 2026, 11:25 | 0.014 | 0.014 mg/l |
| 7 Jan 2026, 12:36 | 0.0077 | 0.0077 mg/l |
| 11 Mar 2025, 10:27 | <0.01 | below 0.01 mg/l (not detected above this) |
| 4 Feb 2025, 13:11 | <0.01 | below 0.01 mg/l (not detected above this) |
| 21 Jan 2025, 09:50 | <0.01 | below 0.01 mg/l (not detected above this) |
| 10 Dec 2024, 12:29 | <0.01 | below 0.01 mg/l (not detected above this) |
| 19 Nov 2024, 09:32 | <0.01 | below 0.01 mg/l (not detected above this) |
| 14 Oct 2024, 13:10 | <0.01 | below 0.01 mg/l (not detected above this) |
| 17 Sep 2024, 13:24 | <0.01 | below 0.01 mg/l (not detected above this) |
| 28 Aug 2024, 11:59 | <0.01 | below 0.01 mg/l (not detected above this) |
| 29 Jul 2024, 13:13 | <0.01 | below 0.01 mg/l (not detected above this) |
| 17 Jun 2024, 09:20 | <0.01 | below 0.01 mg/l (not detected above this) |
| 14 May 2024, 09:50 | <0.01 | below 0.01 mg/l (not detected above this) |
| 15 Apr 2024, 12:13 | <0.01 | below 0.01 mg/l (not detected above this) |
| 20 Feb 2024, 11:47 | <0.01 | below 0.01 mg/l (not detected above this) |
| 16 Jan 2024, 13:37 | 0.012 | 0.012 mg/l |
| 5 Dec 2023, 08:51 | 0.013 | 0.013 mg/l |
| 20 Nov 2023, 11:46 | <0.01 | below 0.01 mg/l (not detected above this) |
| 17 Oct 2023, 12:09 | <0.01 | below 0.01 mg/l (not detected above this) |
Conductivity
at 25 °C · code 0077 · µS/cm
542 µS/cm
Sampled 27 Aug 2026, 35 days ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 27 Aug 2026, 10:33 | 542 | 542 µS/cm |
| 31 Jul 2026, 11:15 | 542 | 542 µS/cm |
| 22 Jun 2026, 14:48 | 547 | 547 µS/cm |
| 18 May 2026, 11:49 | 549 | 549 µS/cm |
| 15 Apr 2026, 10:18 | 558 | 558 µS/cm |
| 5 Mar 2026, 10:09 | 575 | 575 µS/cm |
| 10 Feb 2026, 11:25 | 542 | 542 µS/cm |
| 7 Jan 2026, 12:36 | 592 | 592 µS/cm |
| 11 Mar 2025, 10:27 | 591 | 591 µS/cm |
| 4 Feb 2025, 13:11 | 571 | 571 µS/cm |
| 21 Jan 2025, 09:50 | 596 | 596 µS/cm |
| 10 Dec 2024, 12:29 | 584 | 584 µS/cm |
| 19 Nov 2024, 09:32 | 598 | 598 µS/cm |
| 14 Oct 2024, 13:10 | 580 | 580 µS/cm |
| 17 Sep 2024, 13:24 | 577 | 577 µS/cm |
| 28 Aug 2024, 11:59 | 558 | 558 µS/cm |
| 29 Jul 2024, 13:13 | 572 | 572 µS/cm |
| 17 Jun 2024, 09:20 | 596 | 596 µS/cm |
| 14 May 2024, 09:50 | 583 | 583 µS/cm |
| 15 Apr 2024, 12:13 | 585 | 585 µS/cm |
| 20 Feb 2024, 11:47 | 573 | 573 µS/cm |
| 16 Jan 2024, 13:37 | 616 | 616 µS/cm |
| 5 Dec 2023, 08:51 | 570 | 570 µS/cm |
| 20 Nov 2023, 11:46 | 595 | 595 µS/cm |
| 17 Oct 2023, 12:09 | 577 | 577 µS/cm |
Everything measured here
67 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 67 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 25 | Oct 2023 – Aug 2026 | 93.9% 27 Aug 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 25 | Oct 2023 – Aug 2026 | 9.26 mg/l 27 Aug 2026 |
| Temperature of Water 0076 | River water | 25 | Oct 2023 – Aug 2026 | 15.9 °C 27 Aug 2026 |
| pH 0061 | River water | 25 | Oct 2023 – Aug 2026 | 8.1 27 Aug 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 25 | Oct 2023 – Aug 2026 | below 0.002 mg/l 27 Aug 2026 |
| Nitrate as N 0117 | River water | 25 | Oct 2023 – Aug 2026 | 6.69 mg/l 27 Aug 2026 |
| Orthophosphate, reactive as P 0180 | River water | 25 | Oct 2023 – Aug 2026 | 0.014 mg/l 27 Aug 2026 |
| Conductivity at 25 C 0077 | River water | 25 | Oct 2023 – Aug 2026 | 542 µS/cm 27 Aug 2026 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 10 Dec 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 10 Dec 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 10 Dec 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 10 Dec 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 10 Dec 2024 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 10 Dec 2024 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 10 Dec 2024 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 1 | Dec 2024 – Dec 2024 | below 0.004 µg/l 10 Dec 2024 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 1 | Dec 2024 – Dec 2024 | below 0.005 µg/l 10 Dec 2024 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 10 Dec 2024 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 10 Dec 2024 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 10 Dec 2024 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 10 Dec 2024 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 24 | Oct 2023 – Aug 2026 | 200 mg/l 27 Aug 2026 |
| Ammonia un-ionised as N 0119 | River water | 25 | Oct 2023 – Aug 2026 | below 0.00006 mg/l 27 Aug 2026 |
| BOD : 5 Day ATU 0085 | River water | 18 | Feb 2024 – May 2026 | 1 mg/l 18 May 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 8 | Jan 2026 – Aug 2026 | 3.5 mg/l 27 Aug 2026 |
| Chloride 0172 | River water | 8 | Jan 2026 – Aug 2026 | 20 mg/l 27 Aug 2026 |
| Flow Type 2896 | River water | 8 | Jan 2026 – Aug 2026 | Moderate Flow 27 Aug 2026 |
| GCMS Screen : Target Based multi-residue screening : Semi Quantitative 4994 | River water | 1 | Mar 2026 – Mar 2026 | 1 text result 5 Mar 2026 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 10 Dec 2024 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 10 Dec 2024 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 10 Dec 2024 |
| Nitrite as N 0118 | River water | 25 | Oct 2023 – Aug 2026 | 0.0074 mg/l 27 Aug 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 25 | Oct 2023 – Aug 2026 | 6.7 mg/l 27 Aug 2026 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 10 Dec 2024 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 10 Dec 2024 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 10 Dec 2024 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 10 Dec 2024 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 10 Dec 2024 |
| Perfluorobutanesulfonic acid 2972 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 10 Dec 2024 |
| Perfluorobutanoic acid 2995 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 10 Dec 2024 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 10 Dec 2024 |
| Perfluorodecanesulfonic acid 2969 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 10 Dec 2024 |
| Perfluorodecanoic acid 8892 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 10 Dec 2024 |
| Perfluorododecane sulfonic acid 2968 | River water | 1 | Dec 2024 – Dec 2024 | below 0.005 µg/l 10 Dec 2024 |
| Perfluorododecanoic acid 8894 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 10 Dec 2024 |
| Perfluoroheptanesulfonic acid 2967 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 10 Dec 2024 |
| Perfluoroheptanoic acid 8889 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 10 Dec 2024 |
| Perfluorohexanesulfonamide 2965 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 10 Dec 2024 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 10 Dec 2024 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 10 Dec 2024 |
| Perfluorohexanoic acid 8888 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 10 Dec 2024 |
| Perfluorononanesulfonic acid 2963 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 10 Dec 2024 |
| Perfluorononanoic acid 8891 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 10 Dec 2024 |
| Perfluorooctadecanoic acid 2962 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 10 Dec 2024 |
| Perfluorooctanesulfonamide 2961 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 10 Dec 2024 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 10 Dec 2024 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 10 Dec 2024 |
| Perfluorooctanoic acid 8890 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 10 Dec 2024 |
| Perfluoropentanesulfonic acid 2957 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 10 Dec 2024 |
| Perfluoropentanoic acid 8887 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 10 Dec 2024 |
| Perfluorotetradecanoic acid 8895 | River water | 1 | Dec 2024 – Dec 2024 | below 0.006 µg/l 10 Dec 2024 |
| Perfluorotridecanoic acid 2955 | River water | 1 | Dec 2024 – Dec 2024 | below 0.005 µg/l 10 Dec 2024 |
| Perfluoroundecane sulfonic acid 2953 | River water | 1 | Dec 2024 – Dec 2024 | below 0.004 µg/l 10 Dec 2024 |
| Perfluoroundecanoic acid 8893 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 10 Dec 2024 |
| Phosphorus, Total as P 0348 | River water | 8 | Jan 2026 – Aug 2026 | 0.082 mg/l 27 Aug 2026 |
| Silica, reactive as SiO2 0182 | River water | 8 | Jan 2026 – Aug 2026 | 5.9 mg/l 27 Aug 2026 |
| Solids, Suspended at 105 C 0135 | River water | 8 | Jan 2026 – Aug 2026 | 37 mg/l 27 Aug 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.