Portlane Brook above Thames
EA name: PORTLANE BROOK ABOVE THAMES
Environment Agency sampling point TH-PTHR0054 · 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
- 9 Mar 2026, 11:387 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
- 30 since 23 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 512190, 169160As published, to the nearest 10 m. Open in a map
- River, by its own name
- Portlane Brook
- River, by the map
- Portlane BrookPlaced on the river its name gives, 11 m from the line.
- Next gauge downstream
- Molesey Lock On the River Thames · 3.2 km along the river
- Why it was sampled
- Monitoring (national agency policy) (30 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
102.3%
Sampled 9 Mar 2026, 7 months ago · 30 results banked
Every result (30)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Mar 2026, 11:38 | 102.3 | 102.3% |
| 2 Feb 2026, 10:20 | 93.4 | 93.4% |
| 8 Jan 2026, 10:36 | 77.8 | 77.8% |
| 10 Dec 2025, 10:26 | 92.7 | 92.7% |
| 13 Nov 2025, 09:46 | 86.8 | 86.8% |
| 21 Oct 2025, 11:26 | 76.1 | 76.1% |
| 22 Sep 2025, 12:43 | 94.3 | 94.3% |
| 5 Aug 2025, 12:01 | 85.2 | 85.2% |
| 3 Jul 2025, 11:47 | 86.6 | 86.6% |
| 19 Jun 2025, 10:27 | 84.6 | 84.6% |
| 22 May 2025, 11:51 | 103.1 | 103.1% |
| 28 Apr 2025, 09:54 | 114.4 | 114.4% |
| 14 Mar 2025, 11:46 | 108.3 | 108.3% |
| 20 Feb 2025, 09:37 | 98.1 | 98.1% |
| 28 Jan 2025, 12:57 | 97.7 | 97.7% |
| 5 Dec 2024, 10:33 | 96.7 | 96.7% |
| 28 Nov 2024, 10:12 | 92.3 | 92.3% |
| 16 Oct 2024, 13:38 | 93 | 93% |
| 19 Sep 2024, 12:14 | 88.5 | 88.5% |
| 23 Aug 2024, 10:44 | 87 | 87% |
| 15 Jul 2024, 12:27 | 94.1 | 94.1% |
| 19 Jun 2024, 11:05 | 85.2 | 85.2% |
| 9 May 2024, 11:33 | 99.2 | 99.2% |
| 23 Apr 2024, 10:08 | 93.1 | 93.1% |
| 21 Mar 2024, 11:31 | 99.9 | 99.9% |
| 20 Feb 2024, 10:30 | 95.2 | 95.2% |
| 17 Jan 2024, 12:09 | 96.9 | 96.9% |
| 11 Dec 2023, 11:11 | 89.9 | 89.9% |
| 20 Nov 2023, 11:56 | 89.2 | 89.2% |
| 23 Oct 2023, 10:54 | 90.3 | 90.3% |
Dissolved oxygen
as O2 · code 9924 · mg/l
11.6 mg/l
Sampled 9 Mar 2026, 7 months ago · 30 results banked
Every result (30)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Mar 2026, 11:38 | 11.6 | 11.6 mg/l |
| 2 Feb 2026, 10:20 | 11 | 11 mg/l |
| 8 Jan 2026, 10:36 | 9.82 | 9.82 mg/l |
| 10 Dec 2025, 10:26 | 10.6 | 10.6 mg/l |
| 13 Nov 2025, 09:46 | 9.08 | 9.08 mg/l |
| 21 Oct 2025, 11:26 | 7.7 | 7.7 mg/l |
| 22 Sep 2025, 12:43 | 9.78 | 9.78 mg/l |
| 5 Aug 2025, 12:01 | 8.16 | 8.16 mg/l |
| 3 Jul 2025, 11:47 | 8.42 | 8.42 mg/l |
| 19 Jun 2025, 10:27 | 8 | 8 mg/l |
| 22 May 2025, 11:51 | 10.1 | 10.1 mg/l |
| 28 Apr 2025, 09:54 | 12 | 12 mg/l |
| 14 Mar 2025, 11:46 | 12.6 | 12.6 mg/l |
| 20 Feb 2025, 09:37 | 11.9 | 11.9 mg/l |
| 28 Jan 2025, 12:57 | 11.8 | 11.8 mg/l |
| 5 Dec 2024, 10:33 | 11.1 | 11.1 mg/l |
| 28 Nov 2024, 10:12 | 11.2 | 11.2 mg/l |
| 16 Oct 2024, 13:38 | 9.56 | 9.56 mg/l |
| 19 Sep 2024, 12:14 | 8.34 | 8.34 mg/l |
| 23 Aug 2024, 10:44 | 8.44 | 8.44 mg/l |
| 15 Jul 2024, 12:27 | 8.92 | 8.92 mg/l |
| 19 Jun 2024, 11:05 | 8.53 | 8.53 mg/l |
| 9 May 2024, 11:33 | 9.93 | 9.93 mg/l |
| 23 Apr 2024, 10:08 | 10.3 | 10.3 mg/l |
| 21 Mar 2024, 11:31 | 10.8 | 10.8 mg/l |
| 20 Feb 2024, 10:30 | 10.8 | 10.8 mg/l |
| 17 Jan 2024, 12:09 | 12.5 | 12.5 mg/l |
| 11 Dec 2023, 11:11 | 10.6 | 10.6 mg/l |
| 20 Nov 2023, 11:56 | 9.98 | 9.98 mg/l |
| 23 Oct 2023, 10:54 | 9.41 | 9.41 mg/l |
Water temperature
code 0076 · °C
9.9 °C
Sampled 9 Mar 2026, 7 months ago · 30 results banked
Every result (30)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Mar 2026, 11:38 | 9.9 | 9.9 °C |
| 2 Feb 2026, 10:20 | 8.1 | 8.1 °C |
| 8 Jan 2026, 10:36 | 5.4 | 5.4 °C |
| 10 Dec 2025, 10:26 | 9.3 | 9.3 °C |
| 13 Nov 2025, 09:46 | 13.2 | 13.2 °C |
| 21 Oct 2025, 11:26 | 14.7 | 14.7 °C |
| 22 Sep 2025, 12:43 | 13.6 | 13.6 °C |
| 5 Aug 2025, 12:01 | 17.3 | 17.3 °C |
| 3 Jul 2025, 11:47 | 16.6 | 16.6 °C |
| 19 Jun 2025, 10:27 | 17.9 | 17.9 °C |
| 22 May 2025, 11:51 | 16.3 | 16.3 °C |
| 28 Apr 2025, 09:54 | 13.2 | 13.2 °C |
| 14 Mar 2025, 11:46 | 8.8 | 8.8 °C |
| 20 Feb 2025, 09:37 | 7 | 7 °C |
| 28 Jan 2025, 12:57 | 7.1 | 7.1 °C |
| 5 Dec 2024, 10:33 | 9.2 | 9.2 °C |
| 28 Nov 2024, 10:12 | 7.1 | 7.1 °C |
| 16 Oct 2024, 13:38 | 14 | 14 °C |
| 19 Sep 2024, 12:14 | 18.1 | 18.1 °C |
| 23 Aug 2024, 10:44 | 16.7 | 16.7 °C |
| 15 Jul 2024, 12:27 | 17.8 | 17.8 °C |
| 19 Jun 2024, 11:05 | 15.2 | 15.2 °C |
| 9 May 2024, 11:33 | 15.2 | 15.2 °C |
| 23 Apr 2024, 10:08 | 10.6 | 10.6 °C |
| 21 Mar 2024, 11:31 | 11.7 | 11.7 °C |
| 20 Feb 2024, 10:30 | 9.8 | 9.8 °C |
| 17 Jan 2024, 12:09 | 4.5 | 4.5 °C |
| 11 Dec 2023, 11:11 | 8.1 | 8.1 °C |
| 20 Nov 2023, 11:56 | 10.3 | 10.3 °C |
| 23 Oct 2023, 10:54 | 13.4 | 13.4 °C |
pH
code 0061
8.41
Sampled 9 Mar 2026, 7 months ago · 30 results banked
Every result (30)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Mar 2026, 11:38 | 8.41 | 8.41 |
| 2 Feb 2026, 10:20 | 8.07 | 8.07 |
| 8 Jan 2026, 10:36 | 7.88 | 7.88 |
| 10 Dec 2025, 10:26 | 7.97 | 7.97 |
| 13 Nov 2025, 09:46 | 7.93 | 7.93 |
| 21 Oct 2025, 11:26 | 7.63 | 7.63 |
| 22 Sep 2025, 12:43 | 7.96 | 7.96 |
| 5 Aug 2025, 12:01 | 8.02 | 8.02 |
| 3 Jul 2025, 11:47 | 7.98 | 7.98 |
| 19 Jun 2025, 10:27 | 7.95 | 7.95 |
| 22 May 2025, 11:51 | 8.34 | 8.34 |
| 28 Apr 2025, 09:54 | 8.46 | 8.46 |
| 14 Mar 2025, 11:46 | 8.18 | 8.18 |
| 20 Feb 2025, 09:37 | 8.2 | 8.2 |
| 28 Jan 2025, 12:57 | 7.98 | 7.98 |
| 5 Dec 2024, 10:33 | 7.97 | 7.97 |
| 28 Nov 2024, 10:12 | 7.76 | 7.76 |
| 16 Oct 2024, 13:38 | 7.87 | 7.87 |
| 19 Sep 2024, 12:14 | 7.92 | 7.92 |
| 23 Aug 2024, 10:44 | 8 | 8 |
| 15 Jul 2024, 12:27 | 8.12 | 8.12 |
| 19 Jun 2024, 11:05 | 8.04 | 8.04 |
| 9 May 2024, 11:33 | 8.09 | 8.09 |
| 23 Apr 2024, 10:08 | 7.88 | 7.88 |
| 21 Mar 2024, 11:31 | 7.93 | 7.93 |
| 20 Feb 2024, 10:30 | 7.88 | 7.88 |
| 17 Jan 2024, 12:09 | 8.21 | 8.21 |
| 11 Dec 2023, 11:11 | 7.94 | 7.94 |
| 20 Nov 2023, 11:56 | 7.76 | 7.76 |
| 23 Oct 2023, 10:54 | 7.99 | 7.99 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.043 mg/l
Sampled 9 Mar 2026, 7 months ago · 30 results banked
Every result (30)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Mar 2026, 11:38 | 0.043 | 0.043 mg/l |
| 2 Feb 2026, 10:20 | 0.044 | 0.044 mg/l |
| 8 Jan 2026, 10:36 | 0.087 | 0.087 mg/l |
| 10 Dec 2025, 10:26 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Nov 2025, 09:46 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Oct 2025, 11:26 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Sep 2025, 12:43 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Aug 2025, 12:01 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Jul 2025, 11:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Jun 2025, 10:27 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 May 2025, 11:51 | <0.03 | below 0.03 mg/l (not detected above this) |
| 28 Apr 2025, 09:54 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Mar 2025, 11:46 | 0.089 | 0.089 mg/l |
| 20 Feb 2025, 09:37 | 0.033 | 0.033 mg/l |
| 28 Jan 2025, 12:57 | 0.037 | 0.037 mg/l |
| 5 Dec 2024, 10:33 | 0.066 | 0.066 mg/l |
| 28 Nov 2024, 10:12 | 0.11 | 0.11 mg/l |
| 16 Oct 2024, 13:38 | 0.074 | 0.074 mg/l |
| 19 Sep 2024, 12:14 | 0.065 | 0.065 mg/l |
| 23 Aug 2024, 10:44 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Jul 2024, 12:27 | 0.038 | 0.038 mg/l |
| 19 Jun 2024, 11:05 | 0.093 | 0.093 mg/l |
| 9 May 2024, 11:33 | 0.049 | 0.049 mg/l |
| 23 Apr 2024, 10:08 | 0.074 | 0.074 mg/l |
| 21 Mar 2024, 11:31 | 0.14 | 0.14 mg/l |
| 20 Feb 2024, 10:30 | 0.08 | 0.08 mg/l |
| 17 Jan 2024, 12:09 | 0.42 | 0.42 mg/l |
| 11 Dec 2023, 11:11 | 0.061 | 0.061 mg/l |
| 20 Nov 2023, 11:56 | 0.092 | 0.092 mg/l |
| 23 Oct 2023, 10:54 | 0.067 | 0.067 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
6.29 mg/l
Sampled 9 Mar 2026, 7 months ago · 30 results banked
Every result (30)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Mar 2026, 11:38 | 6.29 | 6.29 mg/l |
| 2 Feb 2026, 10:20 | 1.99 | 1.99 mg/l |
| 8 Jan 2026, 10:36 | 4.66 | 4.66 mg/l |
| 10 Dec 2025, 10:26 | 1.39 | 1.39 mg/l |
| 13 Nov 2025, 09:46 | 5.79 | 5.79 mg/l |
| 21 Oct 2025, 11:26 | 2.39 | 2.39 mg/l |
| 22 Sep 2025, 12:43 | 4.09 | 4.09 mg/l |
| 5 Aug 2025, 12:01 | 5.18 | 5.18 mg/l |
| 3 Jul 2025, 11:47 | 5.04 | 5.04 mg/l |
| 19 Jun 2025, 10:27 | 4.98 | 4.98 mg/l |
| 22 May 2025, 11:51 | 7.66 | 7.66 mg/l |
| 28 Apr 2025, 09:54 | 6.37 | 6.37 mg/l |
| 14 Mar 2025, 11:46 | 5.97 | 5.97 mg/l |
| 20 Feb 2025, 09:37 | 0.987 | 0.987 mg/l |
| 28 Jan 2025, 12:57 | 1.88 | 1.88 mg/l |
| 5 Dec 2024, 10:33 | 4.87 | 4.87 mg/l |
| 28 Nov 2024, 10:12 | 1.38 | 1.38 mg/l |
| 16 Oct 2024, 13:38 | 1.77 | 1.77 mg/l |
| 19 Sep 2024, 12:14 | 5.93 | 5.93 mg/l |
| 23 Aug 2024, 10:44 | 3.78 | 3.78 mg/l |
| 15 Jul 2024, 12:27 | 6.07 | 6.07 mg/l |
| 19 Jun 2024, 11:05 | 4.82 | 4.82 mg/l |
| 9 May 2024, 11:33 | 5.06 | 5.06 mg/l |
| 23 Apr 2024, 10:08 | 5.26 | 5.26 mg/l |
| 21 Mar 2024, 11:31 | 4.22 | 4.22 mg/l |
| 20 Feb 2024, 10:30 | 1.78 | 1.78 mg/l |
| 17 Jan 2024, 12:09 | 5.21 | 5.21 mg/l |
| 11 Dec 2023, 11:11 | 1.98 | 1.98 mg/l |
| 20 Nov 2023, 11:56 | 1.27 | 1.27 mg/l |
| 23 Oct 2023, 10:54 | 1.88 | 1.88 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.093 mg/l
Sampled 9 Mar 2026, 7 months ago · 30 results banked
Every result (30)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Mar 2026, 11:38 | 0.093 | 0.093 mg/l |
| 2 Feb 2026, 10:20 | 0.089 | 0.089 mg/l |
| 8 Jan 2026, 10:36 | 0.22 | 0.22 mg/l |
| 10 Dec 2025, 10:26 | 0.12 | 0.12 mg/l |
| 13 Nov 2025, 09:46 | 0.22 | 0.22 mg/l |
| 21 Oct 2025, 11:26 | 0.14 | 0.14 mg/l |
| 22 Sep 2025, 12:43 | 0.29 | 0.29 mg/l |
| 5 Aug 2025, 12:01 | 0.21 | 0.21 mg/l |
| 3 Jul 2025, 11:47 | 0.35 | 0.35 mg/l |
| 19 Jun 2025, 10:27 | 0.3 | 0.3 mg/l |
| 22 May 2025, 11:51 | 0.08 | 0.08 mg/l |
| 28 Apr 2025, 09:54 | 0.023 | 0.023 mg/l |
| 14 Mar 2025, 11:46 | 0.13 | 0.13 mg/l |
| 20 Feb 2025, 09:37 | 0.017 | 0.017 mg/l |
| 28 Jan 2025, 12:57 | 0.082 | 0.082 mg/l |
| 5 Dec 2024, 10:33 | 0.19 | 0.19 mg/l |
| 28 Nov 2024, 10:12 | 0.09 | 0.09 mg/l |
| 16 Oct 2024, 13:38 | 0.081 | 0.081 mg/l |
| 19 Sep 2024, 12:14 | 0.28 | 0.28 mg/l |
| 23 Aug 2024, 10:44 | 0.37 | 0.37 mg/l |
| 15 Jul 2024, 12:27 | 0.19 | 0.19 mg/l |
| 19 Jun 2024, 11:05 | 0.27 | 0.27 mg/l |
| 9 May 2024, 11:33 | 0.16 | 0.16 mg/l |
| 23 Apr 2024, 10:08 | 0.19 | 0.19 mg/l |
| 21 Mar 2024, 11:31 | 0.18 | 0.18 mg/l |
| 20 Feb 2024, 10:30 | 0.076 | 0.076 mg/l |
| 17 Jan 2024, 12:09 | 0.16 | 0.16 mg/l |
| 11 Dec 2023, 11:11 | 0.089 | 0.089 mg/l |
| 20 Nov 2023, 11:56 | 0.075 | 0.075 mg/l |
| 23 Oct 2023, 10:54 | 0.1 | 0.1 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
774 µS/cm
Sampled 9 Mar 2026, 7 months ago · 30 results banked
Every result (30)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Mar 2026, 11:38 | 774 | 774 µS/cm |
| 2 Feb 2026, 10:20 | 581 | 581 µS/cm |
| 8 Jan 2026, 10:36 | 786 | 786 µS/cm |
| 10 Dec 2025, 10:26 | 553 | 553 µS/cm |
| 13 Nov 2025, 09:46 | 677 | 677 µS/cm |
| 21 Oct 2025, 11:26 | 602 | 602 µS/cm |
| 22 Sep 2025, 12:43 | 649 | 649 µS/cm |
| 5 Aug 2025, 12:01 | 623 | 623 µS/cm |
| 3 Jul 2025, 11:47 | 638 | 638 µS/cm |
| 19 Jun 2025, 10:27 | 662 | 662 µS/cm |
| 22 May 2025, 11:51 | 671 | 671 µS/cm |
| 28 Apr 2025, 09:54 | 605 | 605 µS/cm |
| 14 Mar 2025, 11:46 | 696 | 696 µS/cm |
| 20 Feb 2025, 09:37 | 573 | 573 µS/cm |
| 28 Jan 2025, 12:57 | 565 | 565 µS/cm |
| 5 Dec 2024, 10:33 | 601 | 601 µS/cm |
| 28 Nov 2024, 10:12 | 505 | 505 µS/cm |
| 16 Oct 2024, 13:38 | 461 | 461 µS/cm |
| 19 Sep 2024, 12:14 | 666 | 666 µS/cm |
| 23 Aug 2024, 10:44 | 664 | 664 µS/cm |
| 15 Jul 2024, 12:27 | 635 | 635 µS/cm |
| 19 Jun 2024, 11:05 | 677 | 677 µS/cm |
| 9 May 2024, 11:33 | 626 | 626 µS/cm |
| 23 Apr 2024, 10:08 | 682 | 682 µS/cm |
| 21 Mar 2024, 11:31 | 807 | 807 µS/cm |
| 20 Feb 2024, 10:30 | 601 | 601 µS/cm |
| 17 Jan 2024, 12:09 | 676 | 676 µS/cm |
| 11 Dec 2023, 11:11 | 534 | 534 µS/cm |
| 20 Nov 2023, 11:56 | 480 | 480 µS/cm |
| 23 Oct 2023, 10:54 | 528 | 528 µS/cm |
Everything measured here
76 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 76 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 30 | Oct 2023 – Mar 2026 | 102.3% 9 Mar 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 30 | Oct 2023 – Mar 2026 | 11.6 mg/l 9 Mar 2026 |
| Temperature of Water 0076 | River water | 30 | Oct 2023 – Mar 2026 | 9.9 °C 9 Mar 2026 |
| pH 0061 | River water | 30 | Oct 2023 – Mar 2026 | 8.41 9 Mar 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 30 | Oct 2023 – Mar 2026 | 0.043 mg/l 9 Mar 2026 |
| Nitrate as N 0117 | River water | 30 | Oct 2023 – Mar 2026 | 6.29 mg/l 9 Mar 2026 |
| Orthophosphate, reactive as P 0180 | River water | 30 | Oct 2023 – Mar 2026 | 0.093 mg/l 9 Mar 2026 |
| Conductivity at 25 C 0077 | River water | 30 | Oct 2023 – Mar 2026 | 774 µS/cm 9 Mar 2026 |
| (Perfluorohexanesulfonyl)[3-(trimethylazaniumyl)propyl]azanide 2890 | River water | 1 | Feb 2026 – Feb 2026 | below 0.0005 µg/l 2 Feb 2026 |
| 10:2 Fluorotelomer sulfonic acid 2994 | River water | 1 | Feb 2026 – Feb 2026 | below 0.002 µg/l 2 Feb 2026 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 5 | Nov 2023 – Feb 2026 | below 0.001 µg/l 2 Feb 2026 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 5 | Nov 2023 – Feb 2026 | below 0.001 µg/l 2 Feb 2026 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 5 | Nov 2023 – Feb 2026 | below 0.001 µg/l 2 Feb 2026 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 5 | Nov 2023 – Feb 2026 | below 0.0005 µg/l 2 Feb 2026 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 5 | Nov 2023 – Feb 2026 | below 0.0005 µg/l 2 Feb 2026 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 5 | Nov 2023 – Feb 2026 | below 0.001 µg/l 2 Feb 2026 |
| 2H-Perfluoro-2-decenoic acid 2888 | River water | 1 | Feb 2026 – Feb 2026 | below 0.001 µg/l 2 Feb 2026 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 5 | Nov 2023 – Feb 2026 | below 0.0005 µg/l 2 Feb 2026 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 5 | Nov 2023 – Feb 2026 | below 0.004 µg/l 2 Feb 2026 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 5 | Nov 2023 – Feb 2026 | 0.0012 µg/l 2 Feb 2026 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 4 | Nov 2023 – Feb 2026 | below 0.0005 µg/l 2 Feb 2026 |
| 5:1:2 Fluorotelomer betaine 2887 | River water | 1 | Feb 2026 – Feb 2026 | below 0.0005 µg/l 2 Feb 2026 |
| 5:3 Fluorotelomer betaine 2886 | River water | 1 | Feb 2026 – Feb 2026 | below 0.0005 µg/l 2 Feb 2026 |
| 6:2 Fluorotelomer phosphate diester 2986 | River water | 1 | Feb 2026 – Feb 2026 | below 0.004 µg/l 2 Feb 2026 |
| 6:2 Fluorotelomer sulfonamide amine oxide (6:2 FTNO) (Capstone A) 2841 | River water | 1 | Feb 2026 – Feb 2026 | below 0.001 µg/l 2 Feb 2026 |
| 6:2 Fluorotelomer sulfonamide betaine 2985 | River water | 1 | Feb 2026 – Feb 2026 | 0.29 µg/l 2 Feb 2026 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 5 | Nov 2023 – Feb 2026 | 0.025 µg/l 2 Feb 2026 |
| 6:2/8:2 Fluorotelomer phosphate diester 2884 | River water | 1 | Feb 2026 – Feb 2026 | below 0.01 µg/l 2 Feb 2026 |
| 6:6 Perfluorophosphinic acid 2883 | River water | 1 | Feb 2026 – Feb 2026 | below 0.004 µg/l 2 Feb 2026 |
| 6:8 Perfluorophosphinic acid 2882 | River water | 1 | Feb 2026 – Feb 2026 | below 0.01 µg/l 2 Feb 2026 |
| 8:2 Fluorotelomer phosphate diester 2880 | River water | 1 | Feb 2026 – Feb 2026 | below 0.004 µg/l 2 Feb 2026 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 5 | Nov 2023 – Feb 2026 | 0.0031 µg/l 2 Feb 2026 |
| 8:8 Perfluorophosphinic acid 2879 | River water | 1 | Feb 2026 – Feb 2026 | below 0.01 µg/l 2 Feb 2026 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 5 | Nov 2023 – Feb 2026 | below 0.0005 µg/l 2 Feb 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 30 | Oct 2023 – Mar 2026 | 230 mg/l 9 Mar 2026 |
| Ammonia un-ionised as N 0119 | River water | 30 | Oct 2023 – Mar 2026 | 0.00078 mg/l 9 Mar 2026 |
| BOD : 5 Day ATU 0085 | River water | 28 | Oct 2023 – Mar 2026 | below 4 mg/l 9 Mar 2026 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 5 | Nov 2023 – Feb 2026 | below 0.001 µg/l 2 Feb 2026 |
| Hexafluoropropylene oxide trimer acid 2980 | River water | 1 | Feb 2026 – Feb 2026 | below 0.001 µg/l 2 Feb 2026 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 5 | Nov 2023 – Feb 2026 | below 0.002 µg/l 2 Feb 2026 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 5 | Nov 2023 – Feb 2026 | below 0.002 µg/l 2 Feb 2026 |
| Nitrite as N 0118 | River water | 30 | Oct 2023 – Mar 2026 | 0.015 mg/l 9 Mar 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 30 | Oct 2023 – Mar 2026 | 6.3 mg/l 9 Mar 2026 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 5 | Nov 2023 – Feb 2026 | below 0.0005 µg/l 2 Feb 2026 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 5 | Nov 2023 – Feb 2026 | below 0.0005 µg/l 2 Feb 2026 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 5 | Nov 2023 – Feb 2026 | below 0.0005 µg/l 2 Feb 2026 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 5 | Nov 2023 – Feb 2026 | below 0.0005 µg/l 2 Feb 2026 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 5 | Nov 2023 – Feb 2026 | 0.032 µg/l 2 Feb 2026 |
| Perfluorobutanesulfonic acid 2972 | River water | 5 | Nov 2023 – Feb 2026 | 0.0034 µg/l 2 Feb 2026 |
| Perfluorobutanoic acid 2995 | River water | 5 | Nov 2023 – Feb 2026 | 0.013 µg/l 2 Feb 2026 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 5 | Nov 2023 – Feb 2026 | 0.00073 µg/l 2 Feb 2026 |
| Perfluorodecanesulfonic acid 2969 | River water | 5 | Nov 2023 – Feb 2026 | below 0.001 µg/l 2 Feb 2026 |
| Perfluorodecanoic acid 8892 | River water | 5 | Nov 2023 – Feb 2026 | below 0.001 µg/l 2 Feb 2026 |
| Perfluorododecane sulfonic acid 2968 | River water | 5 | Nov 2023 – Feb 2026 | below 0.005 µg/l 2 Feb 2026 |
| Perfluorododecanoic acid 8894 | River water | 5 | Nov 2023 – Feb 2026 | below 0.002 µg/l 2 Feb 2026 |
| Perfluoroheptanesulfonic acid 2967 | River water | 5 | Nov 2023 – Feb 2026 | below 0.0005 µg/l 2 Feb 2026 |
| Perfluoroheptanoic acid 8889 | River water | 5 | Nov 2023 – Feb 2026 | 0.012 µg/l 2 Feb 2026 |
| Perfluorohexane sulfonamido amine 2874 | River water | 1 | Feb 2026 – Feb 2026 | below 0.0005 µg/l 2 Feb 2026 |
| Perfluorohexanesulfonamide 2965 | River water | 5 | Nov 2023 – Feb 2026 | 0.00092 µg/l 2 Feb 2026 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 5 | Nov 2023 – Feb 2026 | 0.001 µg/l 2 Feb 2026 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 5 | Nov 2023 – Feb 2026 | 0.0053 µg/l 2 Feb 2026 |
| Perfluorohexanoic acid 8888 | River water | 5 | Nov 2023 – Feb 2026 | 0.018 µg/l 2 Feb 2026 |
| Perfluorononanesulfonic acid 2963 | River water | 5 | Nov 2023 – Feb 2026 | below 0.0005 µg/l 2 Feb 2026 |
| Perfluorononanoic acid 8891 | River water | 5 | Nov 2023 – Feb 2026 | 0.002 µg/l 2 Feb 2026 |
| Perfluorooctadecanoic acid 2962 | River water | 5 | Nov 2023 – Feb 2026 | below 0.002 µg/l 2 Feb 2026 |
| Perfluorooctanesulfonamide 2961 | River water | 5 | Nov 2023 – Feb 2026 | below 0.001 µg/l 2 Feb 2026 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 5 | Nov 2023 – Feb 2026 | 0.0061 µg/l 2 Feb 2026 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 5 | Nov 2023 – Feb 2026 | 0.011 µg/l 2 Feb 2026 |
| Perfluorooctanesulfonic acid (total) 2958 | River water | 1 | Feb 2026 – Feb 2026 | 0.018 µg/l 2 Feb 2026 |
| Perfluorooctanoic acid 8890 | River water | 5 | Nov 2023 – Feb 2026 | 0.0085 µg/l 2 Feb 2026 |
| Perfluoropentanesulfonic acid 2957 | River water | 5 | Nov 2023 – Feb 2026 | 0.00058 µg/l 2 Feb 2026 |
| Perfluoropentanoic acid 8887 | River water | 5 | Nov 2023 – Feb 2026 | 0.028 µg/l 2 Feb 2026 |
| Perfluorotetradecanoic acid 8895 | River water | 5 | Nov 2023 – Feb 2026 | below 0.006 µg/l 2 Feb 2026 |
| Perfluorotridecanoic acid 2955 | River water | 5 | Nov 2023 – Feb 2026 | below 0.002 µg/l 2 Feb 2026 |
| Perfluoroundecane sulfonic acid 2953 | River water | 5 | Nov 2023 – Feb 2026 | below 0.004 µg/l 2 Feb 2026 |
| Perfluoroundecanoic acid 8893 | River water | 5 | Nov 2023 – Feb 2026 | below 0.001 µg/l 2 Feb 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.