River Claw at Claw Bridge
EA name: RIVER CLAW AT CLAW BRIDGE
Environment Agency sampling point SW-81201166 · 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
- 5 May 2026, 14:545 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
- 25 since 2 Apr 2024 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 237442, 100704As published, to the nearest 1 m. Open in a map
- River, by its own name
- Claw
- River, by the map
- River ClawPlaced on the river its name gives, 2 m from the line.
- Next gauge downstream
- Polson Bridge On the River Tamar · 25 km along the river
- Why it was sampled
- Monitoring (national agency policy) (25 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
95%
Sampled 5 May 2026, 5 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 May 2026, 14:54 | 95 | 95% |
| 23 Apr 2026, 14:32 | 101.8 | 101.8% |
| 19 Mar 2026, 12:07 | 95.3 | 95.3% |
| 19 Feb 2026, 11:11 | 99 | 99% |
| 13 Jan 2026, 10:19 | 97.6 | 97.6% |
| 9 Dec 2025, 12:52 | 96.5 | 96.5% |
| 3 Nov 2025, 10:03 | 95.4 | 95.4% |
| 2 Oct 2025, 11:53 | 95.1 | 95.1% |
| 4 Sep 2025, 10:51 | 88.2 | 88.2% |
| 18 Aug 2025, 11:24 | 70.3 | 70.3% |
| 24 Jul 2025, 12:47 | 89.7 | 89.7% |
| 24 Jun 2025, 11:43 | 85.7 | 85.7% |
| 19 May 2025, 12:38 | 94 | 94% |
| 1 Apr 2025, 12:22 | 100.1 | 100.1% |
| 12 Mar 2025, 12:36 | 99.7 | 99.7% |
| 11 Feb 2025, 11:21 | 99 | 99% |
| 27 Jan 2025, 10:59 | 98.6 | 98.6% |
| 10 Dec 2024, 11:36 | 98.2 | 98.2% |
| 19 Nov 2024, 11:42 | 96.1 | 96.1% |
| 31 Oct 2024, 10:25 | 95 | 95% |
| 18 Sep 2024, 11:54 | 93.8 | 93.8% |
| 22 Aug 2024, 08:29 | 85.7 | 85.7% |
| 17 Jul 2024, 13:24 | 97.8 | 97.8% |
| 20 Jun 2024, 13:56 | 92.9 | 92.9% |
Dissolved oxygen
as O2 · code 9924 · mg/l
10.2 mg/l
Sampled 5 May 2026, 5 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 May 2026, 14:54 | 10.2 | 10.2 mg/l |
| 23 Apr 2026, 14:32 | 11 | 11 mg/l |
| 19 Mar 2026, 12:07 | 11 | 11 mg/l |
| 19 Feb 2026, 11:11 | 12.3 | 12.3 mg/l |
| 13 Jan 2026, 10:19 | 11.6 | 11.6 mg/l |
| 9 Dec 2025, 12:52 | 10.5 | 10.5 mg/l |
| 3 Nov 2025, 10:03 | 10.4 | 10.4 mg/l |
| 2 Oct 2025, 11:53 | 10.2 | 10.2 mg/l |
| 4 Sep 2025, 10:51 | 9.05 | 9.05 mg/l |
| 18 Aug 2025, 11:24 | 6.91 | 6.91 mg/l |
| 24 Jul 2025, 12:47 | 8.94 | 8.94 mg/l |
| 24 Jun 2025, 11:43 | 8.62 | 8.62 mg/l |
| 19 May 2025, 12:38 | 10.1 | 10.1 mg/l |
| 1 Apr 2025, 12:22 | 11.4 | 11.4 mg/l |
| 12 Mar 2025, 12:36 | 12.2 | 12.2 mg/l |
| 11 Feb 2025, 11:21 | 12.8 | 12.8 mg/l |
| 27 Jan 2025, 10:59 | 12.3 | 12.3 mg/l |
| 10 Dec 2024, 11:36 | 12 | 12 mg/l |
| 19 Nov 2024, 11:42 | 10.9 | 10.9 mg/l |
| 31 Oct 2024, 10:25 | 10.5 | 10.5 mg/l |
| 18 Sep 2024, 11:54 | 9.9 | 9.9 mg/l |
| 22 Aug 2024, 08:29 | 8.69 | 8.69 mg/l |
| 17 Jul 2024, 13:24 | 9.9 | 9.9 mg/l |
| 20 Jun 2024, 13:56 | 9.4 | 9.4 mg/l |
Water temperature
code 0076 · °C
12.2 °C
Sampled 5 May 2026, 5 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 May 2026, 14:54 | 12.2 | 12.2 °C |
| 23 Apr 2026, 14:32 | 11.7 | 11.7 °C |
| 19 Mar 2026, 12:07 | 8.9 | 8.9 °C |
| 19 Feb 2026, 11:11 | 6.1 | 6.1 °C |
| 13 Jan 2026, 10:19 | 7.7 | 7.7 °C |
| 9 Dec 2025, 12:52 | 11.6 | 11.6 °C |
| 3 Nov 2025, 10:03 | 11.5 | 11.5 °C |
| 2 Oct 2025, 11:53 | 12.1 | 12.1 °C |
| 4 Sep 2025, 10:51 | 14.1 | 14.1 °C |
| 18 Aug 2025, 11:24 | 16.1 | 16.1 °C |
| 24 Jul 2025, 12:47 | 15.4 | 15.4 °C |
| 24 Jun 2025, 11:43 | 15 | 15 °C |
| 19 May 2025, 12:38 | 12.2 | 12.2 °C |
| 1 Apr 2025, 12:22 | 9.4 | 9.4 °C |
| 12 Mar 2025, 12:36 | 6.7 | 6.7 °C |
| 11 Feb 2025, 11:21 | 4.5 | 4.5 °C |
| 27 Jan 2025, 10:59 | 5.8 | 5.8 °C |
| 10 Dec 2024, 11:36 | 6.8 | 6.8 °C |
| 19 Nov 2024, 11:42 | 9.9 | 9.9 °C |
| 31 Oct 2024, 10:25 | 10.7 | 10.7 °C |
| 18 Sep 2024, 11:54 | 12.8 | 12.8 °C |
| 22 Aug 2024, 08:29 | 14.6 | 14.6 °C |
| 17 Jul 2024, 13:24 | 14.7 | 14.7 °C |
| 20 Jun 2024, 13:56 | 14.7 | 14.7 °C |
pH
code 0061
7.42
Sampled 5 May 2026, 5 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 May 2026, 14:54 | 7.42 | 7.42 |
| 23 Apr 2026, 14:32 | 7.56 | 7.56 |
| 19 Mar 2026, 12:07 | 7.45 | 7.45 |
| 19 Feb 2026, 11:11 | 7.37 | 7.37 |
| 13 Jan 2026, 10:19 | 7.22 | 7.22 |
| 9 Dec 2025, 12:52 | 7 | 7 |
| 3 Nov 2025, 10:03 | 7.18 | 7.18 |
| 2 Oct 2025, 11:53 | 7.62 | 7.62 |
| 4 Sep 2025, 10:51 | 7.68 | 7.68 |
| 18 Aug 2025, 11:24 | 7.47 | 7.47 |
| 24 Jul 2025, 12:47 | 7.52 | 7.52 |
| 24 Jun 2025, 11:43 | 7.51 | 7.51 |
| 19 May 2025, 12:38 | 7.59 | 7.59 |
| 1 Apr 2025, 12:22 | 7.76 | 7.76 |
| 12 Mar 2025, 12:36 | 7.61 | 7.61 |
| 11 Feb 2025, 11:21 | 7.43 | 7.43 |
| 27 Jan 2025, 10:59 | 7.3 | 7.3 |
| 10 Dec 2024, 11:36 | 7.36 | 7.36 |
| 19 Nov 2024, 11:42 | 6.98 | 6.98 |
| 31 Oct 2024, 10:25 | 7.39 | 7.39 |
| 18 Sep 2024, 11:54 | 7.34 | 7.34 |
| 22 Aug 2024, 08:29 | 7.46 | 7.46 |
| 17 Jul 2024, 13:24 | 7.42 | 7.42 |
| 20 Jun 2024, 13:56 | 7.51 | 7.51 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 5 May 2026, 5 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 May 2026, 14:54 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Apr 2026, 14:32 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Mar 2026, 12:07 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Feb 2026, 11:11 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Jan 2026, 10:19 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Dec 2025, 12:52 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Nov 2025, 10:03 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Oct 2025, 11:53 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Sep 2025, 10:51 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Aug 2025, 11:24 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Jul 2025, 12:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Jun 2025, 11:43 | 0.037 | 0.037 mg/l |
| 19 May 2025, 12:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Apr 2025, 12:22 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Mar 2025, 12:36 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Feb 2025, 11:21 | <0.03 | below 0.03 mg/l (not detected above this) |
| 27 Jan 2025, 10:59 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Dec 2024, 11:36 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Nov 2024, 11:42 | 0.061 | 0.061 mg/l |
| 31 Oct 2024, 10:25 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Sep 2024, 11:54 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Aug 2024, 08:29 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Jul 2024, 13:24 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Jun 2024, 13:56 | 0.041 | 0.041 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
0.636 mg/l
Sampled 5 May 2026, 5 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 May 2026, 14:54 | 0.636 | 0.636 mg/l |
| 23 Apr 2026, 14:32 | 0.306 | 0.306 mg/l |
| 19 Mar 2026, 12:07 | 0.606 | 0.606 mg/l |
| 19 Feb 2026, 11:11 | 0.476 | 0.476 mg/l |
| 13 Jan 2026, 10:19 | 0.486 | 0.486 mg/l |
| 9 Dec 2025, 12:52 | 0.316 | 0.316 mg/l |
| 3 Nov 2025, 10:03 | 0.676 | 0.676 mg/l |
| 2 Oct 2025, 11:53 | 0.486 | 0.486 mg/l |
| 4 Sep 2025, 10:51 | 0.836 | 0.836 mg/l |
| 18 Aug 2025, 11:24 | 0.46 | 0.46 mg/l |
| 24 Jul 2025, 12:47 | 0.656 | 0.656 mg/l |
| 24 Jun 2025, 11:43 | 0.616 | 0.616 mg/l |
| 19 May 2025, 12:38 | 0.596 | 0.596 mg/l |
| 1 Apr 2025, 12:22 | 0.386 | 0.386 mg/l |
| 12 Mar 2025, 12:36 | 0.496 | 0.496 mg/l |
| 11 Feb 2025, 11:21 | 0.586 | 0.586 mg/l |
| 27 Jan 2025, 10:59 | 0.646 | 0.646 mg/l |
| 10 Dec 2024, 11:36 | 0.716 | 0.716 mg/l |
| 19 Nov 2024, 11:42 | 0.596 | 0.596 mg/l |
| 31 Oct 2024, 10:25 | 0.576 | 0.576 mg/l |
| 18 Sep 2024, 11:54 | 0.626 | 0.626 mg/l |
| 22 Aug 2024, 08:29 | 0.546 | 0.546 mg/l |
| 17 Jul 2024, 13:24 | 0.736 | 0.736 mg/l |
| 20 Jun 2024, 13:56 | 0.656 | 0.656 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.018 mg/l
Sampled 5 May 2026, 5 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 May 2026, 14:54 | 0.018 | 0.018 mg/l |
| 23 Apr 2026, 14:32 | 0.011 | 0.011 mg/l |
| 19 Mar 2026, 12:07 | 0.015 | 0.015 mg/l |
| 19 Feb 2026, 11:11 | 0.025 | 0.025 mg/l |
| 13 Jan 2026, 10:19 | 0.02 | 0.02 mg/l |
| 9 Dec 2025, 12:52 | 0.033 | 0.033 mg/l |
| 3 Nov 2025, 10:03 | 0.018 | 0.018 mg/l |
| 2 Oct 2025, 11:53 | 0.011 | 0.011 mg/l |
| 4 Sep 2025, 10:51 | 0.02 | 0.02 mg/l |
| 18 Aug 2025, 11:24 | 0.015 | 0.015 mg/l |
| 24 Jul 2025, 12:47 | 0.03 | 0.03 mg/l |
| 24 Jun 2025, 11:43 | 0.027 | 0.027 mg/l |
| 19 May 2025, 12:38 | 0.011 | 0.011 mg/l |
| 1 Apr 2025, 12:22 | <0.01 | below 0.01 mg/l (not detected above this) |
| 12 Mar 2025, 12:36 | 0.013 | 0.013 mg/l |
| 11 Feb 2025, 11:21 | 0.014 | 0.014 mg/l |
| 27 Jan 2025, 10:59 | 0.024 | 0.024 mg/l |
| 10 Dec 2024, 11:36 | 0.014 | 0.014 mg/l |
| 19 Nov 2024, 11:42 | 0.056 | 0.056 mg/l |
| 31 Oct 2024, 10:25 | 0.015 | 0.015 mg/l |
| 18 Sep 2024, 11:54 | 0.022 | 0.022 mg/l |
| 22 Aug 2024, 08:29 | 0.025 | 0.025 mg/l |
| 17 Jul 2024, 13:24 | 0.026 | 0.026 mg/l |
| 20 Jun 2024, 13:56 | 0.017 | 0.017 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
173 µS/cm
Sampled 5 May 2026, 5 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 May 2026, 14:54 | 173 | 173 µS/cm |
| 23 Apr 2026, 14:32 | 189 | 189 µS/cm |
| 19 Mar 2026, 12:07 | 145 | 145 µS/cm |
| 19 Feb 2026, 11:11 | 111 | 111 µS/cm |
| 13 Jan 2026, 10:19 | 116 | 116 µS/cm |
| 9 Dec 2025, 12:52 | 96 | 96 µS/cm |
| 3 Nov 2025, 10:03 | 144 | 144 µS/cm |
| 2 Oct 2025, 11:53 | 189 | 189 µS/cm |
| 4 Sep 2025, 10:51 | 232 | 232 µS/cm |
| 18 Aug 2025, 11:24 | 262 | 262 µS/cm |
| 24 Jul 2025, 12:47 | 230 | 230 µS/cm |
| 24 Jun 2025, 11:43 | 213 | 213 µS/cm |
| 19 May 2025, 12:38 | 219 | 219 µS/cm |
| 1 Apr 2025, 12:22 | 216 | 216 µS/cm |
| 12 Mar 2025, 12:36 | 186 | 186 µS/cm |
| 11 Feb 2025, 11:21 | 180 | 180 µS/cm |
| 27 Jan 2025, 10:59 | 139 | 139 µS/cm |
| 10 Dec 2024, 11:36 | 150 | 150 µS/cm |
| 19 Nov 2024, 11:42 | 117 | 117 µS/cm |
| 31 Oct 2024, 10:25 | 153 | 153 µS/cm |
| 18 Sep 2024, 11:54 | 190 | 190 µS/cm |
| 22 Aug 2024, 08:29 | 232 | 232 µS/cm |
| 17 Jul 2024, 13:24 | 170 | 170 µS/cm |
| 20 Jun 2024, 13:56 | 207 | 207 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 | 24 | Jun 2024 – May 2026 | 95% 5 May 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 24 | Jun 2024 – May 2026 | 10.2 mg/l 5 May 2026 |
| Temperature of Water 0076 | River water | 24 | Jun 2024 – May 2026 | 12.2 °C 5 May 2026 |
| pH 0061 | River water | 24 | Jun 2024 – May 2026 | 7.42 5 May 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 24 | Jun 2024 – May 2026 | below 0.03 mg/l 5 May 2026 |
| Nitrate as N 0117 | River water | 24 | Jun 2024 – May 2026 | 0.636 mg/l 5 May 2026 |
| Orthophosphate, reactive as P 0180 | River water | 24 | Jun 2024 – May 2026 | 0.018 mg/l 5 May 2026 |
| Conductivity at 25 C 0077 | River water | 24 | Jun 2024 – May 2026 | 173 µS/cm 5 May 2026 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 4 | Apr 2024 – Mar 2025 | below 0.001 µg/l 12 Mar 2025 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 4 | Apr 2024 – Mar 2025 | below 0.001 µg/l 12 Mar 2025 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 4 | Apr 2024 – Mar 2025 | below 0.001 µg/l 12 Mar 2025 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 4 | Apr 2024 – Mar 2025 | below 0.002 µg/l 12 Mar 2025 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 12 Mar 2025 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 4 | Apr 2024 – Mar 2025 | below 0.001 µg/l 12 Mar 2025 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 12 Mar 2025 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 4 | Apr 2024 – Mar 2025 | below 0.004 µg/l 12 Mar 2025 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 4 | Apr 2024 – Mar 2025 | below 0.005 µg/l 12 Mar 2025 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 12 Mar 2025 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 4 | Apr 2024 – Mar 2025 | below 0.001 µg/l 12 Mar 2025 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 4 | Apr 2024 – Mar 2025 | below 0.001 µg/l 12 Mar 2025 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 12 Mar 2025 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 23 | Jun 2024 – May 2026 | 46 mg/l 5 May 2026 |
| Ammonia un-ionised as N 0119 | River water | 24 | Jun 2024 – May 2026 | below 0.00017 mg/l 5 May 2026 |
| BOD : 5 Day ATU 0085 | River water | 24 | Jun 2024 – May 2026 | below 4 mg/l 5 May 2026 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 4 | Apr 2024 – Mar 2025 | below 0.001 µg/l 12 Mar 2025 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 4 | Apr 2024 – Mar 2025 | below 0.002 µg/l 12 Mar 2025 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 4 | Apr 2024 – Mar 2025 | below 0.002 µg/l 12 Mar 2025 |
| Nitrite as N 0118 | River water | 24 | Jun 2024 – May 2026 | below 0.004 mg/l 5 May 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 24 | Jun 2024 – May 2026 | 0.64 mg/l 5 May 2026 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 12 Mar 2025 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 12 Mar 2025 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 12 Mar 2025 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 12 Mar 2025 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 12 Mar 2025 |
| Perfluorobutanesulfonic acid 2972 | River water | 4 | Apr 2024 – Mar 2025 | below 0.001 µg/l 12 Mar 2025 |
| Perfluorobutanoic acid 2995 | River water | 4 | Apr 2024 – Mar 2025 | below 0.001 µg/l 12 Mar 2025 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 12 Mar 2025 |
| Perfluorodecanesulfonic acid 2969 | River water | 3 | Apr 2024 – Mar 2025 | below 0.002 µg/l 12 Mar 2025 |
| Perfluorodecanoic acid 8892 | River water | 4 | Apr 2024 – Mar 2025 | below 0.002 µg/l 12 Mar 2025 |
| Perfluorododecane sulfonic acid 2968 | River water | 4 | Apr 2024 – Mar 2025 | below 0.005 µg/l 12 Mar 2025 |
| Perfluorododecanoic acid 8894 | River water | 4 | Apr 2024 – Mar 2025 | below 0.002 µg/l 12 Mar 2025 |
| Perfluoroheptanesulfonic acid 2967 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 12 Mar 2025 |
| Perfluoroheptanoic acid 8889 | River water | 4 | Apr 2024 – Mar 2025 | below 0.001 µg/l 12 Mar 2025 |
| Perfluorohexanesulfonamide 2965 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 12 Mar 2025 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 12 Mar 2025 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 12 Mar 2025 |
| Perfluorohexanoic acid 8888 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 12 Mar 2025 |
| Perfluorononanesulfonic acid 2963 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 12 Mar 2025 |
| Perfluorononanoic acid 8891 | River water | 4 | Apr 2024 – Mar 2025 | below 0.001 µg/l 12 Mar 2025 |
| Perfluorooctadecanoic acid 2962 | River water | 4 | Apr 2024 – Mar 2025 | below 0.002 µg/l 12 Mar 2025 |
| Perfluorooctanesulfonamide 2961 | River water | 4 | Apr 2024 – Mar 2025 | below 0.001 µg/l 12 Mar 2025 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 12 Mar 2025 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 12 Mar 2025 |
| Perfluorooctanoic acid 8890 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 12 Mar 2025 |
| Perfluoropentanesulfonic acid 2957 | River water | 4 | Apr 2024 – Mar 2025 | below 0.0005 µg/l 12 Mar 2025 |
| Perfluoropentanoic acid 8887 | River water | 4 | Apr 2024 – Mar 2025 | below 0.001 µg/l 12 Mar 2025 |
| Perfluorotetradecanoic acid 8895 | River water | 4 | Apr 2024 – Mar 2025 | below 0.006 µg/l 12 Mar 2025 |
| Perfluorotridecanoic acid 2955 | River water | 4 | Apr 2024 – Mar 2025 | below 0.005 µg/l 12 Mar 2025 |
| Perfluoroundecane sulfonic acid 2953 | River water | 4 | Apr 2024 – Mar 2025 | below 0.004 µg/l 12 Mar 2025 |
| Perfluoroundecanoic acid 8893 | River water | 4 | Apr 2024 – Mar 2025 | below 0.002 µg/l 12 Mar 2025 |
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.