West Okement downstream of Meldon Dam
EA name: WEST OKEMENT D/S MELDON DAM (also listed as “WEST OKEMENT RIVER BELOW MELDON DAM”)
Environment Agency sampling point SW-72940381 · 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
- 18 May 2026, 15:374 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
- 28 since 21 Jun 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 256358, 91671As published, to the nearest 1 m. Open in a map
- River, by its own name
- West Okement
- River, by the map
- West Okement RiverPlaced on the river its name gives, 4 m from the line.
- Next gauge downstream
- Jacobstowe On the River Okement · 14 km along the riverBeside Meldon: too close to say above or below.
- Nearest gauge upstream
- Vellake On the West Okement River · 1.8 km along the river
- Why it was sampled
- Monitoring (national agency policy) (28 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
90.2%
Sampled 18 May 2026, 4 months ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 15:37 | 90.2 | 90.2% |
| 5 May 2026, 15:58 | 95.4 | 95.4% |
| 30 Apr 2026, 09:10 | 97.6 | 97.6% |
| 23 Apr 2026, 10:44 | 95.4 | 95.4% |
| 17 Mar 2026, 10:35 | 99.5 | 99.5% |
| 4 Mar 2026, 12:30 | 99.4 | 99.4% |
| 23 Feb 2026, 10:22 | 98.8 | 98.8% |
| 2 Feb 2026, 14:15 | 99.4 | 99.4% |
| 20 Jan 2026, 10:01 | 97.6 | 97.6% |
| 15 Jan 2026, 11:23 | 100.8 | 100.8% |
| 17 Dec 2025, 10:52 | 100.9 | 100.9% |
| 11 Dec 2025, 10:08 | 99.9 | 99.9% |
| 21 Nov 2025, 12:24 | 93.1 | 93.1% |
| 3 Nov 2025, 13:43 | 95.4 | 95.4% |
| 6 Oct 2025, 14:26 | 97.1 | 97.1% |
| 1 Sep 2025, 13:57 | 55.2 | 55.2% |
| 6 Aug 2025, 10:58 | 61.7 | 61.7% |
| 25 Jul 2025, 10:46 | 68.1 | 68.1% |
| 26 Jun 2025, 11:54 | 79.3 | 79.3% |
| 23 May 2025, 09:50 | 83.6 | 83.6% |
| 30 Apr 2025, 11:00 | 99.8 | 99.8% |
| 31 Mar 2025, 11:00 | 95.3 | 95.3% |
| 20 Feb 2025, 14:06 | 104.2 | 104.2% |
| 13 Feb 2025, 10:27 | 96.4 | 96.4% |
| 23 Jan 2025, 14:15 | 96.4 | 96.4% |
| 3 Dec 2024, 11:26 | 101.2 | 101.2% |
| 17 Jul 2024, 16:26 | 95.9 | 95.9% |
| 21 Jun 2024, 11:41 | 93 | 93% |
Dissolved oxygen
as O2 · code 9924 · mg/l
10.1 mg/l
Sampled 18 May 2026, 4 months ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 15:37 | 10.1 | 10.1 mg/l |
| 5 May 2026, 15:58 | 10.5 | 10.5 mg/l |
| 30 Apr 2026, 09:10 | 11 | 11 mg/l |
| 23 Apr 2026, 10:44 | 10.7 | 10.7 mg/l |
| 17 Mar 2026, 10:35 | 11.7 | 11.7 mg/l |
| 4 Mar 2026, 12:30 | 11.6 | 11.6 mg/l |
| 23 Feb 2026, 10:22 | 11.8 | 11.8 mg/l |
| 2 Feb 2026, 14:15 | 12.3 | 12.3 mg/l |
| 20 Jan 2026, 10:01 | 12.3 | 12.3 mg/l |
| 15 Jan 2026, 11:23 | 12.5 | 12.5 mg/l |
| 17 Dec 2025, 10:52 | 11.8 | 11.8 mg/l |
| 11 Dec 2025, 10:08 | 11.5 | 11.5 mg/l |
| 21 Nov 2025, 12:24 | 10.7 | 10.7 mg/l |
| 3 Nov 2025, 13:43 | 10.4 | 10.4 mg/l |
| 6 Oct 2025, 14:26 | 10.1 | 10.1 mg/l |
| 1 Sep 2025, 13:57 | 5.75 | 5.75 mg/l |
| 6 Aug 2025, 10:58 | 6.43 | 6.43 mg/l |
| 25 Jul 2025, 10:46 | 7.09 | 7.09 mg/l |
| 26 Jun 2025, 11:54 | 8.32 | 8.32 mg/l |
| 23 May 2025, 09:50 | 8.91 | 8.91 mg/l |
| 30 Apr 2025, 11:00 | 10.9 | 10.9 mg/l |
| 31 Mar 2025, 11:00 | 11.2 | 11.2 mg/l |
| 20 Feb 2025, 14:06 | 12.7 | 12.7 mg/l |
| 13 Feb 2025, 10:27 | 12.2 | 12.2 mg/l |
| 23 Jan 2025, 14:15 | 12 | 12 mg/l |
| 3 Dec 2024, 11:26 | 11.6 | 11.6 mg/l |
| 17 Jul 2024, 16:26 | 9.44 | 9.44 mg/l |
| 21 Jun 2024, 11:41 | 9.48 | 9.48 mg/l |
Water temperature
code 0076 · °C
10.1 °C
Sampled 18 May 2026, 4 months ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 15:37 | 10.1 | 10.1 °C |
| 5 May 2026, 15:58 | 11 | 11 °C |
| 30 Apr 2026, 09:10 | 9.8 | 9.8 °C |
| 23 Apr 2026, 10:44 | 10.3 | 10.3 °C |
| 17 Mar 2026, 10:35 | 8.2 | 8.2 °C |
| 4 Mar 2026, 12:30 | 8.6 | 8.6 °C |
| 23 Feb 2026, 10:22 | 7.5 | 7.5 °C |
| 2 Feb 2026, 14:15 | 6.1 | 6.1 °C |
| 20 Jan 2026, 10:01 | 5.6 | 5.6 °C |
| 15 Jan 2026, 11:23 | 6.1 | 6.1 °C |
| 17 Dec 2025, 10:52 | 8.6 | 8.6 °C |
| 11 Dec 2025, 10:08 | 9.2 | 9.2 °C |
| 21 Nov 2025, 12:24 | 9 | 9 °C |
| 3 Nov 2025, 13:43 | 11.4 | 11.4 °C |
| 6 Oct 2025, 14:26 | 13.6 | 13.6 °C |
| 1 Sep 2025, 13:57 | 13.4 | 13.4 °C |
| 6 Aug 2025, 10:58 | 13.4 | 13.4 °C |
| 25 Jul 2025, 10:46 | 13.4 | 13.4 °C |
| 26 Jun 2025, 11:54 | 13.1 | 13.1 °C |
| 23 May 2025, 09:50 | 12.4 | 12.4 °C |
| 30 Apr 2025, 11:00 | 11.4 | 11.4 °C |
| 31 Mar 2025, 11:00 | 8.1 | 8.1 °C |
| 20 Feb 2025, 14:06 | 6.9 | 6.9 °C |
| 13 Feb 2025, 10:27 | 5.2 | 5.2 °C |
| 23 Jan 2025, 14:15 | 5.9 | 5.9 °C |
| 3 Dec 2024, 11:26 | 9.3 | 9.3 °C |
| 17 Jul 2024, 16:26 | 16 | 16 °C |
| 21 Jun 2024, 11:41 | 14.4 | 14.4 °C |
pH
code 0061
6.66
Sampled 18 May 2026, 4 months ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 15:37 | 6.66 | 6.66 |
| 5 May 2026, 15:58 | 7 | 7 |
| 30 Apr 2026, 09:10 | 7.91 | 7.91 |
| 23 Apr 2026, 10:44 | 7.37 | 7.37 |
| 17 Mar 2026, 10:35 | 5.99 | 5.99 |
| 4 Mar 2026, 12:30 | 5.86 | 5.86 |
| 23 Feb 2026, 10:22 | 5.94 | 5.94 |
| 2 Feb 2026, 14:15 | 5.59 | 5.59 |
| 20 Jan 2026, 10:01 | 5.96 | 5.96 |
| 15 Jan 2026, 11:23 | 6.03 | 6.03 |
| 17 Dec 2025, 10:52 | 5.82 | 5.82 |
| 11 Dec 2025, 10:08 | 5.8 | 5.8 |
| 21 Nov 2025, 12:24 | 6.84 | 6.84 |
| 3 Nov 2025, 13:43 | 7.15 | 7.15 |
| 6 Oct 2025, 14:26 | 7.18 | 7.18 |
| 1 Sep 2025, 13:57 | 5.85 | 5.85 |
| 6 Aug 2025, 10:58 | 5.79 | 5.79 |
| 25 Jul 2025, 10:46 | 6.23 | 6.23 |
| 26 Jun 2025, 11:54 | 6.02 | 6.02 |
| 23 May 2025, 09:50 | 6.58 | 6.58 |
| 30 Apr 2025, 11:00 | 6.71 | 6.71 |
| 31 Mar 2025, 11:00 | 8.17 | 8.17 |
| 20 Feb 2025, 14:06 | 5.98 | 5.98 |
| 13 Feb 2025, 10:27 | 7.75 | 7.75 |
| 23 Jan 2025, 14:15 | 6.89 | 6.89 |
| 3 Dec 2024, 11:26 | 5.57 | 5.57 |
| 17 Jul 2024, 16:26 | 7.25 | 7.25 |
| 21 Jun 2024, 11:41 | 6.69 | 6.69 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 18 May 2026, 4 months ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 15:37 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 May 2026, 15:58 | <0.03 | below 0.03 mg/l (not detected above this) |
| 30 Apr 2026, 09:10 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Apr 2026, 10:44 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Mar 2026, 10:35 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Mar 2026, 12:30 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Feb 2026, 10:22 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Feb 2026, 14:15 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Jan 2026, 10:01 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Jan 2026, 11:23 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Dec 2025, 10:52 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Dec 2025, 10:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Nov 2025, 12:24 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Nov 2025, 13:43 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Oct 2025, 14:26 | 0.044 | 0.044 mg/l |
| 1 Sep 2025, 13:57 | 0.16 | 0.16 mg/l |
| 6 Aug 2025, 10:58 | 0.12 | 0.12 mg/l |
| 25 Jul 2025, 10:46 | 0.11 | 0.11 mg/l |
| 26 Jun 2025, 11:54 | 0.077 | 0.077 mg/l |
| 23 May 2025, 09:50 | 0.03 | 0.03 mg/l |
| 30 Apr 2025, 11:00 | <0.03 | below 0.03 mg/l (not detected above this) |
| 31 Mar 2025, 11:00 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Feb 2025, 14:06 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Feb 2025, 10:27 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Jan 2025, 14:15 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Dec 2024, 11:26 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Jul 2024, 16:26 | 0.032 | 0.032 mg/l |
| 21 Jun 2024, 11:41 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
0.196 mg/l
Sampled 18 May 2026, 4 months ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 15:37 | 0.196 | 0.196 mg/l |
| 5 May 2026, 15:58 | 0.246 | 0.246 mg/l |
| 30 Apr 2026, 09:10 | 0.216 | 0.216 mg/l |
| 23 Apr 2026, 10:44 | 0.216 | 0.216 mg/l |
| 17 Mar 2026, 10:35 | 0.236 | 0.236 mg/l |
| 4 Mar 2026, 12:30 | <0.196 | below 0.196 mg/l (not detected above this) |
| 23 Feb 2026, 10:22 | 0.216 | 0.216 mg/l |
| 2 Feb 2026, 14:15 | 0.226 | 0.226 mg/l |
| 20 Jan 2026, 10:01 | 0.266 | 0.266 mg/l |
| 15 Jan 2026, 11:23 | 0.246 | 0.246 mg/l |
| 17 Dec 2025, 10:52 | 0.226 | 0.226 mg/l |
| 11 Dec 2025, 10:08 | 0.196 | 0.196 mg/l |
| 21 Nov 2025, 12:24 | 0.206 | 0.206 mg/l |
| 3 Nov 2025, 13:43 | 0.306 | 0.306 mg/l |
| 6 Oct 2025, 14:26 | <0.196 | below 0.196 mg/l (not detected above this) |
| 1 Sep 2025, 13:57 | <0.196 | below 0.196 mg/l (not detected above this) |
| 6 Aug 2025, 10:58 | <0.196 | below 0.196 mg/l (not detected above this) |
| 25 Jul 2025, 10:46 | 0.196 | 0.196 mg/l |
| 26 Jun 2025, 11:54 | 0.266 | 0.266 mg/l |
| 23 May 2025, 09:50 | 0.246 | 0.246 mg/l |
| 30 Apr 2025, 11:00 | 0.266 | 0.266 mg/l |
| 31 Mar 2025, 11:00 | <0.196 | below 0.196 mg/l (not detected above this) |
| 20 Feb 2025, 14:06 | <0.196 | below 0.196 mg/l (not detected above this) |
| 13 Feb 2025, 10:27 | <0.196 | below 0.196 mg/l (not detected above this) |
| 23 Jan 2025, 14:15 | <0.196 | below 0.196 mg/l (not detected above this) |
| 3 Dec 2024, 11:26 | <0.196 | below 0.196 mg/l (not detected above this) |
| 17 Jul 2024, 16:26 | <0.196 | below 0.196 mg/l (not detected above this) |
| 21 Jun 2024, 11:41 | <0.196 | below 0.196 mg/l (not detected above this) |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.041 mg/l
Sampled 18 May 2026, 4 months ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 15:37 | 0.041 | 0.041 mg/l |
| 5 May 2026, 15:58 | <0.01 | below 0.01 mg/l (not detected above this) |
| 30 Apr 2026, 09:10 | <0.01 | below 0.01 mg/l (not detected above this) |
| 23 Apr 2026, 10:44 | <0.01 | below 0.01 mg/l (not detected above this) |
| 17 Mar 2026, 10:35 | <0.01 | below 0.01 mg/l (not detected above this) |
| 4 Mar 2026, 12:30 | <0.01 | below 0.01 mg/l (not detected above this) |
| 23 Feb 2026, 10:22 | <0.01 | below 0.01 mg/l (not detected above this) |
| 2 Feb 2026, 14:15 | <0.01 | below 0.01 mg/l (not detected above this) |
| 20 Jan 2026, 10:01 | <0.01 | below 0.01 mg/l (not detected above this) |
| 15 Jan 2026, 11:23 | <0.01 | below 0.01 mg/l (not detected above this) |
| 17 Dec 2025, 10:52 | <0.01 | below 0.01 mg/l (not detected above this) |
| 11 Dec 2025, 10:08 | <0.01 | below 0.01 mg/l (not detected above this) |
| 21 Nov 2025, 12:24 | <0.01 | below 0.01 mg/l (not detected above this) |
| 3 Nov 2025, 13:43 | <0.01 | below 0.01 mg/l (not detected above this) |
| 6 Oct 2025, 14:26 | <0.01 | below 0.01 mg/l (not detected above this) |
| 1 Sep 2025, 13:57 | <0.01 | below 0.01 mg/l (not detected above this) |
| 6 Aug 2025, 10:58 | 0.014 | 0.014 mg/l |
| 25 Jul 2025, 10:46 | <0.01 | below 0.01 mg/l (not detected above this) |
| 26 Jun 2025, 11:54 | <0.01 | below 0.01 mg/l (not detected above this) |
| 23 May 2025, 09:50 | <0.01 | below 0.01 mg/l (not detected above this) |
| 30 Apr 2025, 11:00 | 0.013 | 0.013 mg/l |
| 31 Mar 2025, 11:00 | <0.01 | below 0.01 mg/l (not detected above this) |
| 20 Feb 2025, 14:06 | <0.01 | below 0.01 mg/l (not detected above this) |
| 13 Feb 2025, 10:27 | <0.01 | below 0.01 mg/l (not detected above this) |
| 23 Jan 2025, 14:15 | <0.01 | below 0.01 mg/l (not detected above this) |
| 3 Dec 2024, 11:26 | <0.01 | below 0.01 mg/l (not detected above this) |
| 17 Jul 2024, 16:26 | <0.01 | below 0.01 mg/l (not detected above this) |
| 21 Jun 2024, 11:41 | <0.01 | below 0.01 mg/l (not detected above this) |
Conductivity
at 25 °C · code 0077 · µS/cm
36 µS/cm
Sampled 18 May 2026, 4 months ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 15:37 | 36 | 36 µS/cm |
| 5 May 2026, 15:58 | 35 | 35 µS/cm |
| 30 Apr 2026, 09:10 | 35 | 35 µS/cm |
| 23 Apr 2026, 10:44 | 38 | 38 µS/cm |
| 17 Mar 2026, 10:35 | 30 | 30 µS/cm |
| 4 Mar 2026, 12:30 | 32 | 32 µS/cm |
| 23 Feb 2026, 10:22 | 31 | 31 µS/cm |
| 2 Feb 2026, 14:15 | 32 | 32 µS/cm |
| 20 Jan 2026, 10:01 | 35 | 35 µS/cm |
| 15 Jan 2026, 11:23 | 34 | 34 µS/cm |
| 17 Dec 2025, 10:52 | 31 | 31 µS/cm |
| 11 Dec 2025, 10:08 | 32 | 32 µS/cm |
| 21 Nov 2025, 12:24 | 39 | 39 µS/cm |
| 3 Nov 2025, 13:43 | 56 | 56 µS/cm |
| 6 Oct 2025, 14:26 | 40 | 40 µS/cm |
| 1 Sep 2025, 13:57 | 36 | 36 µS/cm |
| 6 Aug 2025, 10:58 | 35 | 35 µS/cm |
| 25 Jul 2025, 10:46 | 40 | 40 µS/cm |
| 26 Jun 2025, 11:54 | 40 | 40 µS/cm |
| 23 May 2025, 09:50 | 66 | 66 µS/cm |
| 30 Apr 2025, 11:00 | 41 | 41 µS/cm |
| 31 Mar 2025, 11:00 | 48 | 48 µS/cm |
| 20 Feb 2025, 14:06 | 44 | 44 µS/cm |
| 13 Feb 2025, 10:27 | 48 | 48 µS/cm |
| 23 Jan 2025, 14:15 | 39 | 39 µS/cm |
| 3 Dec 2024, 11:26 | 33 | 33 µS/cm |
| 17 Jul 2024, 16:26 | 35 | 35 µS/cm |
| 21 Jun 2024, 11:41 | 35 | 35 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 | 28 | Jun 2024 – May 2026 | 90.2% 18 May 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 28 | Jun 2024 – May 2026 | 10.1 mg/l 18 May 2026 |
| Temperature of Water 0076 | River water | 28 | Jun 2024 – May 2026 | 10.1 °C 18 May 2026 |
| pH 0061 | River water | 28 | Jun 2024 – May 2026 | 6.66 18 May 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 28 | Jun 2024 – May 2026 | below 0.03 mg/l 18 May 2026 |
| Nitrate as N 0117 | River water | 28 | Jun 2024 – May 2026 | 0.196 mg/l 18 May 2026 |
| Orthophosphate, reactive as P 0180 | River water | 28 | Jun 2024 – May 2026 | 0.041 mg/l 18 May 2026 |
| Conductivity at 25 C 0077 | River water | 28 | Jun 2024 – May 2026 | 36 µS/cm 18 May 2026 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 3 Dec 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 3 Dec 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 3 Dec 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 3 Dec 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 3 Dec 2024 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 3 Dec 2024 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 3 Dec 2024 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 1 | Dec 2024 – Dec 2024 | below 0.004 µg/l 3 Dec 2024 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 1 | Dec 2024 – Dec 2024 | below 0.005 µg/l 3 Dec 2024 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 3 Dec 2024 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 3 Dec 2024 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 3 Dec 2024 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 3 Dec 2024 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 28 | Jun 2024 – May 2026 | below 8 mg/l 18 May 2026 |
| Ammonia un-ionised as N 0119 | River water | 28 | Jun 2024 – May 2026 | below 0.00003 mg/l 18 May 2026 |
| BOD : 5 Day ATU 0085 | River water | 27 | Jun 2024 – May 2026 | below 1 mg/l 18 May 2026 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 3 Dec 2024 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 3 Dec 2024 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 3 Dec 2024 |
| Nitrite as N 0118 | River water | 28 | Jun 2024 – May 2026 | below 0.004 mg/l 18 May 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 28 | Jun 2024 – May 2026 | 0.2 mg/l 18 May 2026 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 3 Dec 2024 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 3 Dec 2024 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 3 Dec 2024 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 3 Dec 2024 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 3 Dec 2024 |
| Perfluorobutanesulfonic acid 2972 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 3 Dec 2024 |
| Perfluorobutanoic acid 2995 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 3 Dec 2024 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 3 Dec 2024 |
| Perfluorodecanesulfonic acid 2969 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 3 Dec 2024 |
| Perfluorodecanoic acid 8892 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 3 Dec 2024 |
| Perfluorododecane sulfonic acid 2968 | River water | 1 | Dec 2024 – Dec 2024 | below 0.005 µg/l 3 Dec 2024 |
| Perfluorododecanoic acid 8894 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 3 Dec 2024 |
| Perfluoroheptanesulfonic acid 2967 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 3 Dec 2024 |
| Perfluoroheptanoic acid 8889 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 3 Dec 2024 |
| Perfluorohexanesulfonamide 2965 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 3 Dec 2024 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 3 Dec 2024 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 3 Dec 2024 |
| Perfluorohexanoic acid 8888 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 3 Dec 2024 |
| Perfluorononanesulfonic acid 2963 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 3 Dec 2024 |
| Perfluorononanoic acid 8891 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 3 Dec 2024 |
| Perfluorooctadecanoic acid 2962 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 3 Dec 2024 |
| Perfluorooctanesulfonamide 2961 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 3 Dec 2024 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 3 Dec 2024 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 3 Dec 2024 |
| Perfluorooctanoic acid 8890 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 3 Dec 2024 |
| Perfluoropentanesulfonic acid 2957 | River water | 1 | Dec 2024 – Dec 2024 | below 0.0005 µg/l 3 Dec 2024 |
| Perfluoropentanoic acid 8887 | River water | 1 | Dec 2024 – Dec 2024 | below 0.001 µg/l 3 Dec 2024 |
| Perfluorotetradecanoic acid 8895 | River water | 1 | Dec 2024 – Dec 2024 | below 0.006 µg/l 3 Dec 2024 |
| Perfluorotridecanoic acid 2955 | River water | 1 | Dec 2024 – Dec 2024 | below 0.005 µg/l 3 Dec 2024 |
| Perfluoroundecane sulfonic acid 2953 | River water | 1 | Dec 2024 – Dec 2024 | below 0.004 µg/l 3 Dec 2024 |
| Perfluoroundecanoic acid 8893 | River water | 1 | Dec 2024 – Dec 2024 | below 0.002 µg/l 3 Dec 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.