Cheddar Yeo Hythe
EA name: CHEDDAR YEO HYTHE (also listed as “CHEDDAR YEO AT HYTHE UPSTREAM CHEDDAR STW”)
Environment Agency sampling point SW-E7070400 · 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
- 8 May 2026, 11:255 months ago · time as the Environment Agency records it (UK clock time; the source gives no time zone). Not sampled since, as far as the archive shows: the Environment Agency was asked up to 30 Sep 2026 and had nothing newer.
- Samples banked
- 37 since 2 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 344762, 152304As published, to the nearest 1 m. Open in a map
- River, by its own name
- Cheddar Yeo
- River, by the map
- Cheddar YeoPlaced on the river its name gives, 2 m from the line.
- Next gauge downstream
- None tracedIts water reaches the sea without passing a gauge.
- Nearest gauge upstream
- Cheddar Gorge On the Cheddar Yeo · 2.6 km along the river
- Why it was sampled
- Monitoring (national agency policy) (37 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
108%
Sampled 8 May 2026, 5 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 8 May 2026, 11:25 | 108 | 108% |
| 16 Apr 2026, 11:02 | 107.9 | 107.9% |
| 4 Mar 2026, 10:50 | 107.6 | 107.6% |
| 2 Feb 2026, 09:35 | 100.4 | 100.4% |
| 15 Jan 2026, 13:24 | 99.3 | 99.3% |
| 3 Dec 2025, 09:40 | 97.7 | 97.7% |
| 13 Nov 2025, 14:05 | 99 | 99% |
| 1 Oct 2025, 14:36 | 121.2 | 121.2% |
| 10 Sep 2025, 11:21 | 88.4 | 88.4% |
| 5 Aug 2025, 14:37 | 138.6 | 138.6% |
| 23 Jul 2025, 08:51 | 85.3 | 85.3% |
| 17 Jul 2025, 09:25 | 92.3 | 92.3% |
| 26 Jun 2025, 10:39 | 103.9 | 103.9% |
| 13 May 2025, 14:26 | 159.2 | 159.2% |
| 10 Apr 2025, 15:13 | 171.2 | 171.2% |
| 19 Feb 2025, 14:46 | 109.9 | 109.9% |
| 29 Jan 2025, 10:10 | 99 | 99% |
| 5 Dec 2024, 11:12 | 98.4 | 98.4% |
| 20 Nov 2024, 10:32 | 97.6 | 97.6% |
| 15 Oct 2024, 09:54 | 98.9 | 98.9% |
| 16 Sep 2024, 10:20 | 96.1 | 96.1% |
| 20 Aug 2024, 13:52 | 125.5 | 125.5% |
| 29 Jul 2024, 08:49 | 97.8 | 97.8% |
| 20 Jun 2024, 15:05 | 132.3 | 132.3% |
Dissolved oxygen
as O2 · code 9924 · mg/l
11.5 mg/l
Sampled 8 May 2026, 5 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 8 May 2026, 11:25 | 11.5 | 11.5 mg/l |
| 16 Apr 2026, 11:02 | 11.8 | 11.8 mg/l |
| 4 Mar 2026, 10:50 | 11.9 | 11.9 mg/l |
| 2 Feb 2026, 09:35 | 11.4 | 11.4 mg/l |
| 15 Jan 2026, 13:24 | 11.2 | 11.2 mg/l |
| 3 Dec 2025, 09:40 | 11.3 | 11.3 mg/l |
| 13 Nov 2025, 14:05 | 10.6 | 10.6 mg/l |
| 1 Oct 2025, 14:36 | 12.5 | 12.5 mg/l |
| 10 Sep 2025, 11:21 | 9.29 | 9.29 mg/l |
| 5 Aug 2025, 14:37 | 13.8 | 13.8 mg/l |
| 23 Jul 2025, 08:51 | 9.07 | 9.07 mg/l |
| 17 Jul 2025, 09:25 | 9.64 | 9.64 mg/l |
| 26 Jun 2025, 10:39 | 10.7 | 10.7 mg/l |
| 13 May 2025, 14:26 | 15.6 | 15.6 mg/l |
| 10 Apr 2025, 15:13 | 17.2 | 17.2 mg/l |
| 19 Feb 2025, 14:46 | 12.2 | 12.2 mg/l |
| 29 Jan 2025, 10:10 | 11.3 | 11.3 mg/l |
| 5 Dec 2024, 11:12 | 10.8 | 10.8 mg/l |
| 20 Nov 2024, 10:32 | 11.5 | 11.5 mg/l |
| 15 Oct 2024, 09:54 | 10.9 | 10.9 mg/l |
| 16 Sep 2024, 10:20 | 10.2 | 10.2 mg/l |
| 20 Aug 2024, 13:52 | 12.4 | 12.4 mg/l |
| 29 Jul 2024, 08:49 | 10.4 | 10.4 mg/l |
| 20 Jun 2024, 15:05 | 12.9 | 12.9 mg/l |
Water temperature
code 0076 · °C
12.4 °C
Sampled 8 May 2026, 5 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 8 May 2026, 11:25 | 12.4 | 12.4 °C |
| 16 Apr 2026, 11:02 | 11.3 | 11.3 °C |
| 4 Mar 2026, 10:50 | 10.7 | 10.7 °C |
| 2 Feb 2026, 09:35 | 9.6 | 9.6 °C |
| 15 Jan 2026, 13:24 | 9.8 | 9.8 °C |
| 3 Dec 2025, 09:40 | 8.8 | 8.8 °C |
| 13 Nov 2025, 14:05 | 12 | 12 °C |
| 1 Oct 2025, 14:36 | 13.8 | 13.8 °C |
| 10 Sep 2025, 11:21 | 13 | 13 °C |
| 5 Aug 2025, 14:37 | 15.4 | 15.4 °C |
| 23 Jul 2025, 08:51 | 12.5 | 12.5 °C |
| 17 Jul 2025, 09:25 | 13.3 | 13.3 °C |
| 26 Jun 2025, 10:39 | 14.1 | 14.1 °C |
| 13 May 2025, 14:26 | 16.3 | 16.3 °C |
| 10 Apr 2025, 15:13 | 15 | 15 °C |
| 19 Feb 2025, 14:46 | 10.5 | 10.5 °C |
| 29 Jan 2025, 10:10 | 9.4 | 9.4 °C |
| 5 Dec 2024, 11:12 | 11.1 | 11.1 °C |
| 20 Nov 2024, 10:32 | 8 | 8 °C |
| 15 Oct 2024, 09:54 | 11.1 | 11.1 °C |
| 16 Sep 2024, 10:20 | 12.5 | 12.5 °C |
| 20 Aug 2024, 13:52 | 15.8 | 15.8 °C |
| 29 Jul 2024, 08:49 | 12.5 | 12.5 °C |
| 20 Jun 2024, 15:05 | 16.6 | 16.6 °C |
pH
code 0061
8.27
Sampled 8 May 2026, 5 months ago · 36 results banked
Every result (36)
| Sampled | Result as published | Reads as |
|---|---|---|
| 8 May 2026, 11:25 | 8.27 | 8.27 |
| 16 Apr 2026, 11:02 | 8.36 | 8.36 |
| 4 Mar 2026, 10:50 | 7.8 | 7.8 |
| 2 Feb 2026, 09:35 | 7.87 | 7.87 |
| 15 Jan 2026, 13:24 | 7.85 | 7.85 |
| 3 Dec 2025, 09:40 | 7.8 | 7.8 |
| 13 Nov 2025, 14:05 | 7.76 | 7.76 |
| 1 Oct 2025, 14:36 | 8.36 | 8.36 |
| 10 Sep 2025, 11:21 | 8.11 | 8.11 |
| 5 Aug 2025, 14:37 | 8.62 | 8.62 |
| 23 Jul 2025, 08:51 | 8.07 | 8.07 |
| 17 Jul 2025, 09:25 | 8.12 | 8.12 |
| 26 Jun 2025, 10:39 | 8.36 | 8.36 |
| 13 May 2025, 14:26 | 8.47 | 8.47 |
| 10 Apr 2025, 15:13 | 8.64 | 8.64 |
| 19 Feb 2025, 14:46 | 8.2 | 8.2 |
| 29 Jan 2025, 10:10 | 7.82 | 7.82 |
| 5 Dec 2024, 11:12 | 8 | 8 |
| 20 Nov 2024, 10:32 | 8.09 | 8.09 |
| 15 Oct 2024, 09:54 | 7.88 | 7.88 |
| 16 Sep 2024, 10:20 | 8.07 | 8.07 |
| 20 Aug 2024, 13:52 | 8.3 | 8.3 |
| 29 Jul 2024, 08:49 | 8.09 | 8.09 |
| 20 Jun 2024, 15:05 | 8.41 | 8.41 |
| 19 Mar 2024, 11:43 | 7.83 | 7.83 |
| 1 Mar 2024, 13:56 | 7.85 | 7.85 |
| 21 Feb 2024, 12:55 | 7.67 | 7.67 |
| 1 Feb 2024, 10:53 | 8.25 | 8.25 |
| 15 Jan 2024, 14:42 | 8.11 | 8.11 |
| 11 Jan 2024, 10:59 | 7.82 | 7.82 |
| 18 Dec 2023, 13:06 | 8.02 | 8.02 |
| 4 Dec 2023, 14:19 | 7.81 | 7.81 |
| 21 Nov 2023, 13:25 | 7.84 | 7.84 |
| 3 Nov 2023, 13:00 | 7.69 | 7.69 |
| 19 Oct 2023, 12:30 | 7.98 | 7.98 |
| 2 Oct 2023, 14:29 | 8.2 | 8.2 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 8 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 8 May 2026, 11:25 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Apr 2026, 11:02 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Mar 2026, 10:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Feb 2026, 09:35 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Jan 2026, 13:24 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Dec 2025, 09:40 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Nov 2025, 14:05 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Oct 2025, 14:36 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Sep 2025, 11:21 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Aug 2025, 14:37 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Jul 2025, 08:51 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Jul 2025, 09:25 | <0.03 | below 0.03 mg/l (not detected above this) |
| 26 Jun 2025, 10:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 May 2025, 14:26 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Apr 2025, 15:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Feb 2025, 14:46 | <0.03 | below 0.03 mg/l (not detected above this) |
| 29 Jan 2025, 10:10 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Nov 2024, 10:32 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Oct 2024, 09:54 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Sep 2024, 10:20 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Aug 2024, 13:52 | <0.03 | below 0.03 mg/l (not detected above this) |
| 29 Jul 2024, 08:49 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Jun 2024, 15:05 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
2.79 mg/l
Sampled 8 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 8 May 2026, 11:25 | 2.79 | 2.79 mg/l |
| 16 Apr 2026, 11:02 | 3 | 3 mg/l |
| 4 Mar 2026, 10:50 | 3.1 | 3.1 mg/l |
| 2 Feb 2026, 09:35 | 3.3 | 3.3 mg/l |
| 15 Jan 2026, 13:24 | 2.9 | 2.9 mg/l |
| 3 Dec 2025, 09:40 | 3.1 | 3.1 mg/l |
| 13 Nov 2025, 14:05 | 3.4 | 3.4 mg/l |
| 1 Oct 2025, 14:36 | 2.5 | 2.5 mg/l |
| 10 Sep 2025, 11:21 | 2.79 | 2.79 mg/l |
| 5 Aug 2025, 14:37 | 3.2 | 3.2 mg/l |
| 23 Jul 2025, 08:51 | 3.2 | 3.2 mg/l |
| 17 Jul 2025, 09:25 | 3.2 | 3.2 mg/l |
| 26 Jun 2025, 10:39 | 3.19 | 3.19 mg/l |
| 13 May 2025, 14:26 | 2.79 | 2.79 mg/l |
| 10 Apr 2025, 15:13 | 2.7 | 2.7 mg/l |
| 19 Feb 2025, 14:46 | 3 | 3 mg/l |
| 29 Jan 2025, 10:10 | 2.8 | 2.8 mg/l |
| 20 Nov 2024, 10:32 | 3.2 | 3.2 mg/l |
| 15 Oct 2024, 09:54 | 3.1 | 3.1 mg/l |
| 16 Sep 2024, 10:20 | 3.1 | 3.1 mg/l |
| 20 Aug 2024, 13:52 | 3.09 | 3.09 mg/l |
| 29 Jul 2024, 08:49 | 3.09 | 3.09 mg/l |
| 20 Jun 2024, 15:05 | 2.99 | 2.99 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.025 mg/l
Sampled 8 May 2026, 5 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 8 May 2026, 11:25 | 0.025 | 0.025 mg/l |
| 16 Apr 2026, 11:02 | 0.028 | 0.028 mg/l |
| 4 Mar 2026, 10:50 | 0.017 | 0.017 mg/l |
| 2 Feb 2026, 09:35 | 0.024 | 0.024 mg/l |
| 15 Jan 2026, 13:24 | 0.03 | 0.03 mg/l |
| 3 Dec 2025, 09:40 | 0.027 | 0.027 mg/l |
| 13 Nov 2025, 14:05 | 0.035 | 0.035 mg/l |
| 1 Oct 2025, 14:36 | 0.075 | 0.075 mg/l |
| 10 Sep 2025, 11:21 | 0.034 | 0.034 mg/l |
| 5 Aug 2025, 14:37 | 0.025 | 0.025 mg/l |
| 23 Jul 2025, 08:51 | 0.019 | 0.019 mg/l |
| 17 Jul 2025, 09:25 | 0.02 | 0.02 mg/l |
| 26 Jun 2025, 10:39 | 0.02 | 0.02 mg/l |
| 13 May 2025, 14:26 | 0.014 | 0.014 mg/l |
| 10 Apr 2025, 15:13 | <0.01 | below 0.01 mg/l (not detected above this) |
| 19 Feb 2025, 14:46 | 0.02 | 0.02 mg/l |
| 29 Jan 2025, 10:10 | 0.026 | 0.026 mg/l |
| 20 Nov 2024, 10:32 | 0.047 | 0.047 mg/l |
| 15 Oct 2024, 09:54 | 0.032 | 0.032 mg/l |
| 16 Sep 2024, 10:20 | 0.033 | 0.033 mg/l |
| 20 Aug 2024, 13:52 | 0.031 | 0.031 mg/l |
| 29 Jul 2024, 08:49 | 0.022 | 0.022 mg/l |
| 20 Jun 2024, 15:05 | 0.043 | 0.043 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
522 µS/cm
Sampled 8 May 2026, 5 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 8 May 2026, 11:25 | 522 | 522 µS/cm |
| 16 Apr 2026, 11:02 | 515 | 515 µS/cm |
| 4 Mar 2026, 10:50 | 505 | 505 µS/cm |
| 2 Feb 2026, 09:35 | 513 | 513 µS/cm |
| 15 Jan 2026, 13:24 | 498 | 498 µS/cm |
| 3 Dec 2025, 09:40 | 497 | 497 µS/cm |
| 13 Nov 2025, 14:05 | 522 | 522 µS/cm |
| 1 Oct 2025, 14:36 | 487 | 487 µS/cm |
| 10 Sep 2025, 11:21 | 471 | 471 µS/cm |
| 5 Aug 2025, 14:37 | 518 | 518 µS/cm |
| 23 Jul 2025, 08:51 | 534 | 534 µS/cm |
| 17 Jul 2025, 09:25 | 531 | 531 µS/cm |
| 26 Jun 2025, 10:39 | 568 | 568 µS/cm |
| 13 May 2025, 14:26 | 488 | 488 µS/cm |
| 10 Apr 2025, 15:13 | 473 | 473 µS/cm |
| 19 Feb 2025, 14:46 | 525 | 525 µS/cm |
| 29 Jan 2025, 10:10 | 479 | 479 µS/cm |
| 5 Dec 2024, 11:12 | 533 | 533 µS/cm |
| 20 Nov 2024, 10:32 | 526 | 526 µS/cm |
| 15 Oct 2024, 09:54 | 525 | 525 µS/cm |
| 16 Sep 2024, 10:20 | 525 | 525 µS/cm |
| 20 Aug 2024, 13:52 | 514 | 514 µS/cm |
| 29 Jul 2024, 08:49 | 517 | 517 µS/cm |
| 20 Jun 2024, 15:05 | 507 | 507 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 | 24 | Jun 2024 – May 2026 | 108% 8 May 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 24 | Jun 2024 – May 2026 | 11.5 mg/l 8 May 2026 |
| Temperature of Water 0076 | River water | 24 | Jun 2024 – May 2026 | 12.4 °C 8 May 2026 |
| pH 0061 | River water | 36 | Oct 2023 – May 2026 | 8.27 8 May 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 23 | Jun 2024 – May 2026 | below 0.03 mg/l 8 May 2026 |
| Nitrate as N 0117 | River water | 23 | Jun 2024 – May 2026 | 2.79 mg/l 8 May 2026 |
| Orthophosphate, reactive as P 0180 | River water | 23 | Jun 2024 – May 2026 | 0.025 mg/l 8 May 2026 |
| Conductivity at 25 C 0077 | River water | 24 | Jun 2024 – May 2026 | 522 µS/cm 8 May 2026 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 1 | Jan 2024 – Jan 2024 | below 0.001 µg/l 11 Jan 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 1 | Jan 2024 – Jan 2024 | below 0.001 µg/l 11 Jan 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 1 | Jan 2024 – Jan 2024 | below 0.001 µg/l 11 Jan 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 1 | Jan 2024 – Jan 2024 | below 0.002 µg/l 11 Jan 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 1 | Jan 2024 – Jan 2024 | below 0.0005 µg/l 11 Jan 2024 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 1 | Jan 2024 – Jan 2024 | below 0.001 µg/l 11 Jan 2024 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 1 | Jan 2024 – Jan 2024 | below 0.0005 µg/l 11 Jan 2024 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 1 | Jan 2024 – Jan 2024 | below 0.004 µg/l 11 Jan 2024 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 1 | Jan 2024 – Jan 2024 | below 0.005 µg/l 11 Jan 2024 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 1 | Jan 2024 – Jan 2024 | below 0.0005 µg/l 11 Jan 2024 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 1 | Jan 2024 – Jan 2024 | below 0.001 µg/l 11 Jan 2024 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 1 | Jan 2024 – Jan 2024 | below 0.001 µg/l 11 Jan 2024 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 1 | Jan 2024 – Jan 2024 | below 0.0005 µg/l 11 Jan 2024 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 23 | Jun 2024 – May 2026 | 240 mg/l 8 May 2026 |
| Aluminium, Dissolved 6037 | River water | 12 | Oct 2023 – Mar 2024 | below 10 µg/l 19 Mar 2024 |
| Ammonia un-ionised as N 0119 | River water | 23 | Jun 2024 – May 2026 | below 0.00065 mg/l 8 May 2026 |
| BOD : 5 Day ATU 0085 | River water | 24 | Jun 2024 – May 2026 | 1.3 mg/l 8 May 2026 |
| Cadmium, Dissolved 0106 | River water | 12 | Oct 2023 – Mar 2024 | 0.3 µg/l 19 Mar 2024 |
| Calcium, Dissolved 0239 | River water | 12 | Oct 2023 – Mar 2024 | 88 mg/l 19 Mar 2024 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 12 | Oct 2023 – Mar 2024 | 1.1 mg/l 19 Mar 2024 |
| Chromium, Dissolved 3409 | River water | 12 | Oct 2023 – Mar 2024 | below 0.5 µg/l 19 Mar 2024 |
| Copper, Dissolved 6450 | River water | 12 | Oct 2023 – Mar 2024 | below 1 µg/l 19 Mar 2024 |
| Hardness, Total as CaCO3 0158 | River water | 12 | Oct 2023 – Mar 2024 | 237 mg/l 19 Mar 2024 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 1 | Jan 2024 – Jan 2024 | below 0.001 µg/l 11 Jan 2024 |
| Lead, Dissolved 0052 | River water | 12 | Oct 2023 – Mar 2024 | 16 µg/l 19 Mar 2024 |
| Magnesium, Dissolved 0235 | River water | 12 | Oct 2023 – Mar 2024 | 4.2 mg/l 19 Mar 2024 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 1 | Jan 2024 – Jan 2024 | below 0.002 µg/l 11 Jan 2024 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 1 | Jan 2024 – Jan 2024 | below 0.002 µg/l 11 Jan 2024 |
| Nickel, Dissolved 3410 | River water | 12 | Oct 2023 – Mar 2024 | below 1 µg/l 19 Mar 2024 |
| Nitrite as N 0118 | River water | 23 | Jun 2024 – May 2026 | 0.0062 mg/l 8 May 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 23 | Jun 2024 – May 2026 | 2.8 mg/l 8 May 2026 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 1 | Jan 2024 – Jan 2024 | below 0.0005 µg/l 11 Jan 2024 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 1 | Jan 2024 – Jan 2024 | below 0.0005 µg/l 11 Jan 2024 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 1 | Jan 2024 – Jan 2024 | below 0.0005 µg/l 11 Jan 2024 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 1 | Jan 2024 – Jan 2024 | below 0.0005 µg/l 11 Jan 2024 |
| Perfluorobutanesulfonic acid 2972 | River water | 1 | Jan 2024 – Jan 2024 | below 0.001 µg/l 11 Jan 2024 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 1 | Jan 2024 – Jan 2024 | below 0.0005 µg/l 11 Jan 2024 |
| Perfluorodecanesulfonic acid 2969 | River water | 1 | Jan 2024 – Jan 2024 | below 0.002 µg/l 11 Jan 2024 |
| Perfluorodecanoic acid 8892 | River water | 1 | Jan 2024 – Jan 2024 | below 0.002 µg/l 11 Jan 2024 |
| Perfluorododecane sulfonic acid 2968 | River water | 1 | Jan 2024 – Jan 2024 | below 0.005 µg/l 11 Jan 2024 |
| Perfluorododecanoic acid 8894 | River water | 1 | Jan 2024 – Jan 2024 | below 0.002 µg/l 11 Jan 2024 |
| Perfluoroheptanesulfonic acid 2967 | River water | 1 | Jan 2024 – Jan 2024 | below 0.0005 µg/l 11 Jan 2024 |
| Perfluoroheptanoic acid 8889 | River water | 1 | Jan 2024 – Jan 2024 | below 0.001 µg/l 11 Jan 2024 |
| Perfluorohexanesulfonamide 2965 | River water | 1 | Jan 2024 – Jan 2024 | below 0.0005 µg/l 11 Jan 2024 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 1 | Jan 2024 – Jan 2024 | below 0.0005 µg/l 11 Jan 2024 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 1 | Jan 2024 – Jan 2024 | below 0.0005 µg/l 11 Jan 2024 |
| Perfluorohexanoic acid 8888 | River water | 1 | Jan 2024 – Jan 2024 | below 0.0005 µg/l 11 Jan 2024 |
| Perfluorononanesulfonic acid 2963 | River water | 1 | Jan 2024 – Jan 2024 | below 0.0005 µg/l 11 Jan 2024 |
| Perfluorooctadecanoic acid 2962 | River water | 1 | Jan 2024 – Jan 2024 | below 0.002 µg/l 11 Jan 2024 |
| Perfluorooctanesulfonamide 2961 | River water | 1 | Jan 2024 – Jan 2024 | below 0.001 µg/l 11 Jan 2024 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 1 | Jan 2024 – Jan 2024 | below 0.0005 µg/l 11 Jan 2024 |
| Perfluorooctanoic acid 8890 | River water | 1 | Jan 2024 – Jan 2024 | below 0.0005 µg/l 11 Jan 2024 |
| Perfluoropentanesulfonic acid 2957 | River water | 1 | Jan 2024 – Jan 2024 | below 0.0005 µg/l 11 Jan 2024 |
| Perfluoropentanoic acid 8887 | River water | 1 | Jan 2024 – Jan 2024 | below 0.001 µg/l 11 Jan 2024 |
| Perfluorotetradecanoic acid 8895 | River water | 1 | Jan 2024 – Jan 2024 | below 0.006 µg/l 11 Jan 2024 |
| Perfluorotridecanoic acid 2955 | River water | 1 | Jan 2024 – Jan 2024 | below 0.005 µg/l 11 Jan 2024 |
| Perfluoroundecane sulfonic acid 2953 | River water | 1 | Jan 2024 – Jan 2024 | below 0.004 µg/l 11 Jan 2024 |
| Perfluoroundecanoic acid 8893 | River water | 1 | Jan 2024 – Jan 2024 | below 0.002 µg/l 11 Jan 2024 |
| Zinc, Dissolved 3408 | River water | 12 | Oct 2023 – Mar 2024 | 59 µg/l 19 Mar 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.