River Hayle at St Erth Gauging Station
EA name: RIVER HAYLE AT ST ERTH GAUGING STATION
Environment Agency sampling point SW-82221813 · 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 Aug 2026, 10:0757 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- 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 (UK govt policy - not GQA or RE)
- Where
- National Grid 154874, 34201As published, to the nearest 1 m. Open in a map
- River, by its own name
- Hayle
- River, by the map
- River HaylePlaced on the river its name gives, 1 m from the line.
- Next gauge downstream
- Hayle Tideflap On the River Hayle · 2.2 km along the riverBeside St Erth, ST ERTH: too close to say above or below.
- Nearest gauge upstream
- Relubbus On the River Hayle · 3.0 km along the river
- Why it was sampled
- Monitoring (UK govt policy - not GQA or RE) (35 samples)
Planned investigation (local monitoring) (1 samples)
Monitoring (national agency policy) (1 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
104.8%
Sampled 13 Apr 2026, 6 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Apr 2026, 12:51 | 104.8 | 104.8% |
| 2 Jan 2026, 14:20 | 93.5 | 93.5% |
| 24 Oct 2025, 15:21 | 98.1 | 98.1% |
| 19 Sep 2025, 13:16 | 100.4 | 100.4% |
| 3 Mar 2025, 12:26 | 98.2 | 98.2% |
| 11 Feb 2025, 09:20 | 96.7 | 96.7% |
| 23 Jan 2025, 11:21 | 94.6 | 94.6% |
| 4 Dec 2024, 12:07 | 94.1 | 94.1% |
| 18 Nov 2024, 12:05 | 96.9 | 96.9% |
| 17 Oct 2024, 14:05 | 95.1 | 95.1% |
| 16 Sep 2024, 13:32 | 103.3 | 103.3% |
| 22 Aug 2024, 12:17 | 101.4 | 101.4% |
| 16 Jul 2024, 09:47 | 98.4 | 98.4% |
| 17 Jun 2024, 14:09 | 101.1 | 101.1% |
| 13 May 2024, 11:39 | 95.8 | 95.8% |
| 15 Apr 2024, 13:22 | 100.5 | 100.5% |
| 7 Mar 2024, 11:04 | 97.3 | 97.3% |
| 5 Feb 2024, 12:51 | 97.6 | 97.6% |
| 12 Jan 2024, 10:10 | 96.1 | 96.1% |
| 19 Dec 2023, 13:30 | 93.1 | 93.1% |
| 6 Dec 2023, 14:07 | 98 | 98% |
| 9 Nov 2023, 11:54 | 92.3 | 92.3% |
| 2 Oct 2023, 12:34 | 93.8 | 93.8% |
Dissolved oxygen
as O2 · code 9924 · mg/l
11.4 mg/l
Sampled 13 Apr 2026, 6 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Apr 2026, 12:51 | 11.4 | 11.4 mg/l |
| 2 Jan 2026, 14:20 | 10.7 | 10.7 mg/l |
| 24 Oct 2025, 15:21 | 10.6 | 10.6 mg/l |
| 19 Sep 2025, 13:16 | 9.95 | 9.95 mg/l |
| 3 Mar 2025, 12:26 | 11.2 | 11.2 mg/l |
| 11 Feb 2025, 09:20 | 11.3 | 11.3 mg/l |
| 23 Jan 2025, 11:21 | 10.8 | 10.8 mg/l |
| 4 Dec 2024, 12:07 | 10.4 | 10.4 mg/l |
| 18 Nov 2024, 12:05 | 10.4 | 10.4 mg/l |
| 17 Oct 2024, 14:05 | 9.8 | 9.8 mg/l |
| 16 Sep 2024, 13:32 | 10.3 | 10.3 mg/l |
| 22 Aug 2024, 12:17 | 10.1 | 10.1 mg/l |
| 16 Jul 2024, 09:47 | 10.1 | 10.1 mg/l |
| 17 Jun 2024, 14:09 | 10.5 | 10.5 mg/l |
| 13 May 2024, 11:39 | 10 | 10 mg/l |
| 15 Apr 2024, 13:22 | 10.8 | 10.8 mg/l |
| 7 Mar 2024, 11:04 | 10.7 | 10.7 mg/l |
| 5 Feb 2024, 12:51 | 10.7 | 10.7 mg/l |
| 12 Jan 2024, 10:10 | 11.2 | 11.2 mg/l |
| 19 Dec 2023, 13:30 | 10 | 10 mg/l |
| 6 Dec 2023, 14:07 | 11.1 | 11.1 mg/l |
| 9 Nov 2023, 11:54 | 10.1 | 10.1 mg/l |
| 2 Oct 2023, 12:34 | 9.45 | 9.45 mg/l |
Water temperature
code 0076 · °C
11.6 °C
Sampled 13 Apr 2026, 6 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Apr 2026, 12:51 | 11.6 | 11.6 °C |
| 2 Jan 2026, 14:20 | 9.4 | 9.4 °C |
| 24 Oct 2025, 15:21 | 11.6 | 11.6 °C |
| 19 Sep 2025, 13:16 | 15.7 | 15.7 °C |
| 3 Mar 2025, 12:26 | 9.5 | 9.5 °C |
| 11 Feb 2025, 09:20 | 8.4 | 8.4 °C |
| 23 Jan 2025, 11:21 | 9.4 | 9.4 °C |
| 4 Dec 2024, 12:07 | 11 | 11 °C |
| 18 Nov 2024, 12:05 | 12 | 12 °C |
| 17 Oct 2024, 14:05 | 13.9 | 13.9 °C |
| 16 Sep 2024, 13:32 | 15.3 | 15.3 °C |
| 22 Aug 2024, 12:17 | 15.5 | 15.5 °C |
| 16 Jul 2024, 09:47 | 14.2 | 14.2 °C |
| 17 Jun 2024, 14:09 | 13.6 | 13.6 °C |
| 13 May 2024, 11:39 | 13.3 | 13.3 °C |
| 15 Apr 2024, 13:22 | 12.1 | 12.1 °C |
| 7 Mar 2024, 11:04 | 10.9 | 10.9 °C |
| 5 Feb 2024, 12:51 | 11.2 | 11.2 °C |
| 12 Jan 2024, 10:10 | 8.6 | 8.6 °C |
| 19 Dec 2023, 13:30 | 11.9 | 11.9 °C |
| 6 Dec 2023, 14:07 | 9.8 | 9.8 °C |
| 9 Nov 2023, 11:54 | 11.4 | 11.4 °C |
| 2 Oct 2023, 12:34 | 14.9 | 14.9 °C |
pH
code 0061
7.64
Sampled 13 Apr 2026, 6 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Apr 2026, 12:51 | 7.64 | 7.64 |
| 2 Jan 2026, 14:20 | 7.05 | 7.05 |
| 24 Oct 2025, 15:21 | 7.37 | 7.37 |
| 19 Sep 2025, 13:16 | 7.47 | 7.47 |
| 3 Mar 2025, 12:26 | 7.14 | 7.14 |
| 11 Feb 2025, 09:20 | 7.31 | 7.31 |
| 23 Jan 2025, 11:21 | 7.27 | 7.27 |
| 4 Dec 2024, 12:07 | 7.14 | 7.14 |
| 18 Nov 2024, 12:05 | 7.32 | 7.32 |
| 17 Oct 2024, 14:05 | 7.13 | 7.13 |
| 16 Sep 2024, 13:32 | 7.37 | 7.37 |
| 22 Aug 2024, 12:17 | 7.42 | 7.42 |
| 16 Jul 2024, 09:47 | 7.25 | 7.25 |
| 17 Jun 2024, 14:09 | 7.24 | 7.24 |
| 13 May 2024, 11:39 | 7.15 | 7.15 |
| 15 Apr 2024, 13:22 | 7.18 | 7.18 |
| 7 Mar 2024, 11:04 | 7.16 | 7.16 |
| 5 Feb 2024, 12:51 | 7.38 | 7.38 |
| 12 Jan 2024, 10:10 | 7.02 | 7.02 |
| 19 Dec 2023, 13:30 | 7.21 | 7.21 |
| 6 Dec 2023, 14:07 | 7.21 | 7.21 |
| 9 Nov 2023, 11:54 | 7.07 | 7.07 |
| 2 Oct 2023, 12:34 | 7.22 | 7.22 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 5 Aug 2026, 57 days ago · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Aug 2026, 10:07 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Jul 2026, 15:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Jun 2026, 10:46 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 May 2026, 12:32 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Apr 2026, 12:51 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Mar 2026, 09:40 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Feb 2026, 14:03 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Jan 2026, 14:20 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Dec 2025, 15:01 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Nov 2025, 14:31 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Oct 2025, 15:21 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Sep 2025, 13:16 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Apr 2025, 10:29 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Mar 2025, 12:26 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Feb 2025, 09:20 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Jan 2025, 11:21 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Dec 2024, 12:07 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Nov 2024, 12:05 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Oct 2024, 14:05 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Sep 2024, 13:32 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Aug 2024, 12:17 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Jul 2024, 09:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Jun 2024, 14:09 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 May 2024, 11:39 | 0.037 | 0.037 mg/l |
| 15 Apr 2024, 13:22 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Mar 2024, 11:04 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Feb 2024, 12:51 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Jan 2024, 10:10 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Dec 2023, 13:30 | 0.062 | 0.062 mg/l |
| 6 Dec 2023, 14:07 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Nov 2023, 11:54 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Oct 2023, 12:34 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
2.7 mg/l
Sampled 5 Aug 2026, 57 days ago · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Aug 2026, 10:07 | 2.7 | 2.7 mg/l |
| 9 Jul 2026, 15:47 | 3.1 | 3.1 mg/l |
| 4 Jun 2026, 10:46 | 3.3 | 3.3 mg/l |
| 8 May 2026, 12:32 | 3.8 | 3.8 mg/l |
| 13 Apr 2026, 12:51 | 4 | 4 mg/l |
| 20 Mar 2026, 09:40 | 4.6 | 4.6 mg/l |
| 2 Feb 2026, 14:03 | 5 | 5 mg/l |
| 2 Jan 2026, 14:20 | 4.9 | 4.9 mg/l |
| 1 Dec 2025, 15:01 | 3.5 | 3.5 mg/l |
| 10 Nov 2025, 14:31 | 3.4 | 3.4 mg/l |
| 24 Oct 2025, 15:21 | 2.8 | 2.8 mg/l |
| 19 Sep 2025, 13:16 | 2.7 | 2.7 mg/l |
| 14 Apr 2025, 10:29 | 4 | 4 mg/l |
| 3 Mar 2025, 12:26 | 5 | 5 mg/l |
| 11 Feb 2025, 09:20 | 5.09 | 5.09 mg/l |
| 23 Jan 2025, 11:21 | 4.9 | 4.9 mg/l |
| 4 Dec 2024, 12:07 | 4.4 | 4.4 mg/l |
| 18 Nov 2024, 12:05 | 4 | 4 mg/l |
| 17 Oct 2024, 14:05 | 3.5 | 3.5 mg/l |
| 16 Sep 2024, 13:32 | 3.2 | 3.2 mg/l |
| 22 Aug 2024, 12:17 | 3.3 | 3.3 mg/l |
| 16 Jul 2024, 09:47 | 3.6 | 3.6 mg/l |
| 17 Jun 2024, 14:09 | 4 | 4 mg/l |
| 13 May 2024, 11:39 | 3.7 | 3.7 mg/l |
| 15 Apr 2024, 13:22 | 4.8 | 4.8 mg/l |
| 7 Mar 2024, 11:04 | 5.3 | 5.3 mg/l |
| 5 Feb 2024, 12:51 | 5 | 5 mg/l |
| 12 Jan 2024, 10:10 | 5.6 | 5.6 mg/l |
| 19 Dec 2023, 13:30 | 4.9 | 4.9 mg/l |
| 6 Dec 2023, 14:07 | 5.3 | 5.3 mg/l |
| 9 Nov 2023, 11:54 | 4.5 | 4.5 mg/l |
| 2 Oct 2023, 12:34 | 3.1 | 3.1 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.015 mg/l
Sampled 5 Aug 2026, 57 days ago · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Aug 2026, 10:07 | 0.015 | 0.015 mg/l |
| 9 Jul 2026, 15:47 | 0.03 | 0.03 mg/l |
| 4 Jun 2026, 10:46 | 0.016 | 0.016 mg/l |
| 8 May 2026, 12:32 | 0.014 | 0.014 mg/l |
| 13 Apr 2026, 12:51 | <0.01 | below 0.01 mg/l (not detected above this) |
| 20 Mar 2026, 09:40 | 0.011 | 0.011 mg/l |
| 2 Feb 2026, 14:03 | 0.014 | 0.014 mg/l |
| 2 Jan 2026, 14:20 | 0.017 | 0.017 mg/l |
| 1 Dec 2025, 15:01 | 0.027 | 0.027 mg/l |
| 10 Nov 2025, 14:31 | 0.027 | 0.027 mg/l |
| 24 Oct 2025, 15:21 | 0.022 | 0.022 mg/l |
| 19 Sep 2025, 13:16 | 0.019 | 0.019 mg/l |
| 14 Apr 2025, 10:29 | <0.01 | below 0.01 mg/l (not detected above this) |
| 3 Mar 2025, 12:26 | <0.01 | below 0.01 mg/l (not detected above this) |
| 11 Feb 2025, 09:20 | <0.01 | below 0.01 mg/l (not detected above this) |
| 23 Jan 2025, 11:21 | 0.013 | 0.013 mg/l |
| 4 Dec 2024, 12:07 | <0.01 | below 0.01 mg/l (not detected above this) |
| 18 Nov 2024, 12:05 | 0.012 | 0.012 mg/l |
| 17 Oct 2024, 14:05 | 0.014 | 0.014 mg/l |
| 16 Sep 2024, 13:32 | <0.01 | below 0.01 mg/l (not detected above this) |
| 22 Aug 2024, 12:17 | <0.01 | below 0.01 mg/l (not detected above this) |
| 16 Jul 2024, 09:47 | <0.01 | below 0.01 mg/l (not detected above this) |
| 17 Jun 2024, 14:09 | <0.01 | below 0.01 mg/l (not detected above this) |
| 13 May 2024, 11:39 | 0.036 | 0.036 mg/l |
| 15 Apr 2024, 13:22 | 0.01 | 0.01 mg/l |
| 7 Mar 2024, 11:04 | <0.01 | below 0.01 mg/l (not detected above this) |
| 5 Feb 2024, 12:51 | <0.01 | below 0.01 mg/l (not detected above this) |
| 12 Jan 2024, 10:10 | <0.01 | below 0.01 mg/l (not detected above this) |
| 19 Dec 2023, 13:30 | 0.025 | 0.025 mg/l |
| 6 Dec 2023, 14:07 | <0.01 | below 0.01 mg/l (not detected above this) |
| 9 Nov 2023, 11:54 | <0.01 | below 0.01 mg/l (not detected above this) |
| 2 Oct 2023, 12:34 | 0.013 | 0.013 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
297 µS/cm
Sampled 13 Apr 2026, 6 months ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Apr 2026, 12:51 | 297 | 297 µS/cm |
| 2 Jan 2026, 14:20 | 305 | 305 µS/cm |
| 24 Oct 2025, 15:21 | 306 | 306 µS/cm |
| 19 Sep 2025, 13:16 | 317 | 317 µS/cm |
| 3 Mar 2025, 12:26 | 297 | 297 µS/cm |
| 11 Feb 2025, 09:20 | 307 | 307 µS/cm |
| 23 Jan 2025, 11:21 | 308 | 308 µS/cm |
| 4 Dec 2024, 12:07 | 294 | 294 µS/cm |
| 18 Nov 2024, 12:05 | 305 | 305 µS/cm |
| 17 Oct 2024, 14:05 | 280 | 280 µS/cm |
| 16 Sep 2024, 13:32 | 315 | 315 µS/cm |
| 22 Aug 2024, 12:17 | 321 | 321 µS/cm |
| 16 Jul 2024, 09:47 | 315 | 315 µS/cm |
| 17 Jun 2024, 14:09 | 317 | 317 µS/cm |
| 13 May 2024, 11:39 | 283 | 283 µS/cm |
| 15 Apr 2024, 13:22 | 300 | 300 µS/cm |
| 7 Mar 2024, 11:04 | 302 | 302 µS/cm |
| 5 Feb 2024, 12:51 | 314 | 314 µS/cm |
| 12 Jan 2024, 10:10 | 308 | 308 µS/cm |
| 19 Dec 2023, 13:30 | 288 | 288 µS/cm |
| 6 Dec 2023, 14:07 | 298 | 298 µS/cm |
| 9 Nov 2023, 11:54 | 298 | 298 µS/cm |
| 2 Oct 2023, 12:34 | 316 | 316 µS/cm |
Everything measured here
80 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 80 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 23 | Oct 2023 – Apr 2026 | 104.8% 13 Apr 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 23 | Oct 2023 – Apr 2026 | 11.4 mg/l 13 Apr 2026 |
| Temperature of Water 0076 | River water | 23 | Oct 2023 – Apr 2026 | 11.6 °C 13 Apr 2026 |
| pH 0061 | River water | 23 | Oct 2023 – Apr 2026 | 7.64 13 Apr 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 32 | Oct 2023 – Aug 2026 | below 0.03 mg/l 5 Aug 2026 |
| Nitrate as N 0117 | River water | 32 | Oct 2023 – Aug 2026 | 2.7 mg/l 5 Aug 2026 |
| Orthophosphate, reactive as P 0180 | River water | 32 | Oct 2023 – Aug 2026 | 0.015 mg/l 5 Aug 2026 |
| Conductivity at 25 C 0077 | River water | 23 | Oct 2023 – Apr 2026 | 297 µS/cm 13 Apr 2026 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 1 | Oct 2024 – Oct 2024 | below 0.001 µg/l 17 Oct 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 1 | Oct 2024 – Oct 2024 | below 0.001 µg/l 17 Oct 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 1 | Oct 2024 – Oct 2024 | below 0.001 µg/l 17 Oct 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 1 | Oct 2024 – Oct 2024 | below 0.002 µg/l 17 Oct 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 17 Oct 2024 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 1 | Oct 2024 – Oct 2024 | below 0.001 µg/l 17 Oct 2024 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 17 Oct 2024 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 1 | Oct 2024 – Oct 2024 | below 0.004 µg/l 17 Oct 2024 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 1 | Oct 2024 – Oct 2024 | below 0.005 µg/l 17 Oct 2024 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 17 Oct 2024 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 1 | Oct 2024 – Oct 2024 | below 0.001 µg/l 17 Oct 2024 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 1 | Oct 2024 – Oct 2024 | below 0.001 µg/l 17 Oct 2024 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 17 Oct 2024 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 23 | Oct 2023 – Apr 2026 | 39 mg/l 13 Apr 2026 |
| Ammonia un-ionised as N 0119 | River water | 23 | Oct 2023 – Apr 2026 | below 0.00027 mg/l 13 Apr 2026 |
| BOD : 5 Day ATU 0085 | River water | 16 | Apr 2024 – Apr 2026 | 1.4 mg/l 13 Apr 2026 |
| Cadmium 0108 | River water | 35 | Oct 2023 – Aug 2026 | 1.1 µg/l 5 Aug 2026 |
| Copper 6452 | River water | 35 | Oct 2023 – Aug 2026 | 31 µg/l 5 Aug 2026 |
| GCMS Screen : Target Based multi-residue screening : Semi Quantitative 4994 | River water | 5 | Apr 2026 – Aug 2026 | 1 text result 5 Aug 2026 |
| HCH -gamma :- {Lindane} 0499 | River water | 35 | Oct 2023 – Aug 2026 | below 0.003 µg/l 5 Aug 2026 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 1 | Oct 2024 – Oct 2024 | below 0.001 µg/l 17 Oct 2024 |
| LCMS Screen : Semi Quantitative 7299 | River water | 1 | Jun 2026 – Jun 2026 | 1 text result 4 Jun 2026 |
| Lead 0050 | River water | 35 | Oct 2023 – Aug 2026 | 0.34 µg/l 5 Aug 2026 |
| Mercury 0105 | River water | 35 | Oct 2023 – Aug 2026 | below 0.01 µg/l 5 Aug 2026 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 1 | Oct 2024 – Oct 2024 | below 0.002 µg/l 17 Oct 2024 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 1 | Oct 2024 – Oct 2024 | below 0.002 µg/l 17 Oct 2024 |
| Nickel 6462 | River water | 31 | Feb 2024 – Aug 2026 | 30 µg/l 5 Aug 2026 |
| Nitrite as N 0118 | River water | 32 | Oct 2023 – Aug 2026 | below 0.004 mg/l 5 Aug 2026 |
| Nitrogen, Total as N 9686 | River water | 28 | Oct 2023 – Aug 2026 | 2.9 mg/l 5 Aug 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 32 | Oct 2023 – Aug 2026 | 2.7 mg/l 5 Aug 2026 |
| PCB - 028 9768 | River water | 35 | Oct 2023 – Aug 2026 | below 0.001 µg/l 5 Aug 2026 |
| PCB - 052 9769 | River water | 35 | Oct 2023 – Aug 2026 | below 0.001 µg/l 5 Aug 2026 |
| PCB - 101 9770 | River water | 35 | Oct 2023 – Aug 2026 | below 0.001 µg/l 5 Aug 2026 |
| PCB - 118 9771 | River water | 35 | Oct 2023 – Aug 2026 | below 0.001 µg/l 5 Aug 2026 |
| PCB - 138 9772 | River water | 35 | Oct 2023 – Aug 2026 | below 0.001 µg/l 5 Aug 2026 |
| PCB - 153 9773 | River water | 35 | Oct 2023 – Aug 2026 | below 0.001 µg/l 5 Aug 2026 |
| PCB - 180 9774 | River water | 35 | Oct 2023 – Aug 2026 | below 0.002 µg/l 5 Aug 2026 |
| PCB : Total 0753 | River water | 35 | Oct 2023 – Aug 2026 | below 0.008 µg/l 5 Aug 2026 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 17 Oct 2024 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 17 Oct 2024 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 17 Oct 2024 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 17 Oct 2024 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 17 Oct 2024 |
| Perfluorobutanesulfonic acid 2972 | River water | 1 | Oct 2024 – Oct 2024 | below 0.001 µg/l 17 Oct 2024 |
| Perfluorobutanoic acid 2995 | River water | 1 | Oct 2024 – Oct 2024 | below 0.001 µg/l 17 Oct 2024 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 17 Oct 2024 |
| Perfluorodecanesulfonic acid 2969 | River water | 1 | Oct 2024 – Oct 2024 | below 0.002 µg/l 17 Oct 2024 |
| Perfluorodecanoic acid 8892 | River water | 1 | Oct 2024 – Oct 2024 | below 0.002 µg/l 17 Oct 2024 |
| Perfluorododecane sulfonic acid 2968 | River water | 1 | Oct 2024 – Oct 2024 | below 0.005 µg/l 17 Oct 2024 |
| Perfluorododecanoic acid 8894 | River water | 1 | Oct 2024 – Oct 2024 | below 0.002 µg/l 17 Oct 2024 |
| Perfluoroheptanesulfonic acid 2967 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 17 Oct 2024 |
| Perfluoroheptanoic acid 8889 | River water | 1 | Oct 2024 – Oct 2024 | below 0.001 µg/l 17 Oct 2024 |
| Perfluorohexanesulfonamide 2965 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 17 Oct 2024 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 17 Oct 2024 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 17 Oct 2024 |
| Perfluorohexanoic acid 8888 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 17 Oct 2024 |
| Perfluorononanesulfonic acid 2963 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 17 Oct 2024 |
| Perfluorononanoic acid 8891 | River water | 1 | Oct 2024 – Oct 2024 | below 0.001 µg/l 17 Oct 2024 |
| Perfluorooctadecanoic acid 2962 | River water | 1 | Oct 2024 – Oct 2024 | below 0.002 µg/l 17 Oct 2024 |
| Perfluorooctanesulfonamide 2961 | River water | 1 | Oct 2024 – Oct 2024 | below 0.001 µg/l 17 Oct 2024 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 17 Oct 2024 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 17 Oct 2024 |
| Perfluorooctanoic acid 8890 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 17 Oct 2024 |
| Perfluoropentanesulfonic acid 2957 | River water | 1 | Oct 2024 – Oct 2024 | below 0.0005 µg/l 17 Oct 2024 |
| Perfluoropentanoic acid 8887 | River water | 1 | Oct 2024 – Oct 2024 | below 0.001 µg/l 17 Oct 2024 |
| Perfluorotetradecanoic acid 8895 | River water | 1 | Oct 2024 – Oct 2024 | below 0.006 µg/l 17 Oct 2024 |
| Perfluorotridecanoic acid 2955 | River water | 1 | Oct 2024 – Oct 2024 | below 0.005 µg/l 17 Oct 2024 |
| Perfluoroundecane sulfonic acid 2953 | River water | 1 | Oct 2024 – Oct 2024 | below 0.004 µg/l 17 Oct 2024 |
| Perfluoroundecanoic acid 8893 | River water | 1 | Oct 2024 – Oct 2024 | below 0.002 µg/l 17 Oct 2024 |
| Phosphorus, Total as P 0348 | River water | 28 | Oct 2023 – Aug 2026 | 0.017 mg/l 5 Aug 2026 |
| Solids, Suspended at 105 C 0135 | River water | 30 | Oct 2023 – Aug 2026 | below 3 mg/l 5 Aug 2026 |
| Zinc 6455 | River water | 35 | Oct 2023 – Aug 2026 | 600 µg/l 5 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.