Elstow Brook downstream of Marston Mortaine sewage treatment works
EA name: ELSTOW BK.D/S MARSTON MORTAINE STW
Environment Agency sampling point AN-12M44 · 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
- 21 Sep 2026, 11:0510 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 31 since 9 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) · results completed 23 Sep 2026
- Where
- National Grid 500150, 242297As published, to the nearest 1 m. Open in a map
- River, by its own name
- Its name does not give one
- River, by the map
- Not placedTwo watercourses within reach (1 m and 5 m) and no name to choose by. The river map cannot say which watercourse this is.
- Next gauge downstream
- Not known
- Why it was sampled
- Monitoring (national agency policy) (29 samples)
Environmental monitoring statutory (EU directives) (2 samples)
Results here were completed a median of 10 days after the sample was taken (2 to 56 days, 13 samples).
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
89.7%
Sampled 21 Sep 2026, 10 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 11:05 | 89.7 | 89.7% |
| 3 Aug 2026, 10:46 | 90 | 90% |
| 7 Jul 2026, 10:26 | 90.8 | 90.8% |
| 5 Jun 2026, 09:35 | 89 | 89% |
| 1 May 2026, 14:37 | 72 | 72% |
| 7 Apr 2026, 10:54 | 87.7 | 87.7% |
| 6 Mar 2026, 10:33 | 95.8 | 95.8% |
| 5 Feb 2026, 10:44 | 96.9 | 96.9% |
| 7 Jan 2026, 11:35 | 91.5 | 91.5% |
| 2 Dec 2025, 11:08 | 89.4 | 89.4% |
| 13 Nov 2025, 10:16 | 87.4 | 87.4% |
| 3 Oct 2025, 11:13 | 85.3 | 85.3% |
| 2 Sep 2025, 14:06 | 81 | 81% |
| 1 Aug 2025, 10:50 | 86.1 | 86.1% |
| 8 Jul 2025, 09:35 | 84.2 | 84.2% |
| 6 Jun 2025, 10:10 | 45.7 | 45.7% |
| 7 May 2025, 16:38 | 47.1 | 47.1% |
| 1 Apr 2025, 10:09 | 26.6 | 26.6% |
| 11 Mar 2025, 09:44 | 74.4 | 74.4% |
| 4 Feb 2025, 09:31 | 88.3 | 88.3% |
| 20 Jan 2025, 11:16 | 76.5 | 76.5% |
| 2 Dec 2024, 11:11 | 83.1 | 83.1% |
| 18 Nov 2024, 09:24 | 79.1 | 79.1% |
| 16 Oct 2024, 10:49 | 85.1 | 85.1% |
| 16 Sep 2024, 10:49 | 74.1 | 74.1% |
| 21 Aug 2024, 10:26 | 68.7 | 68.7% |
| 15 Jul 2024, 16:58 | 63.5 | 63.5% |
| 20 Jun 2024, 12:06 | 63.2 | 63.2% |
Dissolved oxygen
as O2 · code 9924 · mg/l
8.93 mg/l
Sampled 21 Sep 2026, 10 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 11:05 | 8.93 | 8.93 mg/l |
| 3 Aug 2026, 10:46 | 7.88 | 7.88 mg/l |
| 7 Jul 2026, 10:26 | 8.06 | 8.06 mg/l |
| 5 Jun 2026, 09:35 | 8.56 | 8.56 mg/l |
| 1 May 2026, 14:37 | 6.87 | 6.87 mg/l |
| 7 Apr 2026, 10:54 | 9.24 | 9.24 mg/l |
| 6 Mar 2026, 10:33 | 10.5 | 10.5 mg/l |
| 5 Feb 2026, 10:44 | 11.6 | 11.6 mg/l |
| 7 Jan 2026, 11:35 | 10.8 | 10.8 mg/l |
| 2 Dec 2025, 11:08 | 9.81 | 9.81 mg/l |
| 13 Nov 2025, 10:16 | 8.71 | 8.71 mg/l |
| 3 Oct 2025, 11:13 | 8.07 | 8.07 mg/l |
| 2 Sep 2025, 14:06 | 7.42 | 7.42 mg/l |
| 1 Aug 2025, 10:50 | 7.81 | 7.81 mg/l |
| 8 Jul 2025, 09:35 | 7.89 | 7.89 mg/l |
| 6 Jun 2025, 10:10 | 4.42 | 4.42 mg/l |
| 7 May 2025, 16:38 | 4.66 | 4.66 mg/l |
| 1 Apr 2025, 10:09 | 2.82 | 2.82 mg/l |
| 11 Mar 2025, 09:44 | 8.36 | 8.36 mg/l |
| 4 Feb 2025, 09:31 | 10.5 | 10.5 mg/l |
| 20 Jan 2025, 11:16 | 8.74 | 8.74 mg/l |
| 2 Dec 2024, 11:11 | 9.12 | 9.12 mg/l |
| 18 Nov 2024, 09:24 | 8.45 | 8.45 mg/l |
| 16 Oct 2024, 10:49 | 8.79 | 8.79 mg/l |
| 16 Sep 2024, 10:49 | 6.87 | 6.87 mg/l |
| 21 Aug 2024, 10:26 | 6.29 | 6.29 mg/l |
| 15 Jul 2024, 16:58 | 5.88 | 5.88 mg/l |
| 20 Jun 2024, 12:06 | 5.94 | 5.94 mg/l |
Water temperature
code 0076 · °C
15.5 °C
Sampled 21 Sep 2026, 10 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 11:05 | 15.5 | 15.5 °C |
| 3 Aug 2026, 10:46 | 21.8 | 21.8 °C |
| 7 Jul 2026, 10:26 | 21.1 | 21.1 °C |
| 5 Jun 2026, 09:35 | 17.1 | 17.1 °C |
| 1 May 2026, 14:37 | 17.5 | 17.5 °C |
| 7 Apr 2026, 10:54 | 12.9 | 12.9 °C |
| 6 Mar 2026, 10:33 | 11.1 | 11.1 °C |
| 5 Feb 2026, 10:44 | 7.4 | 7.4 °C |
| 7 Jan 2026, 11:35 | 8 | 8 °C |
| 2 Dec 2025, 11:08 | 11.1 | 11.1 °C |
| 13 Nov 2025, 10:16 | 15.4 | 15.4 °C |
| 3 Oct 2025, 11:13 | 17.9 | 17.9 °C |
| 2 Sep 2025, 14:06 | 19.5 | 19.5 °C |
| 1 Aug 2025, 10:50 | 20 | 20 °C |
| 8 Jul 2025, 09:35 | 18.4 | 18.4 °C |
| 6 Jun 2025, 10:10 | 16.8 | 16.8 °C |
| 7 May 2025, 16:38 | 15.8 | 15.8 °C |
| 1 Apr 2025, 10:09 | 12.7 | 12.7 °C |
| 11 Mar 2025, 09:44 | 10.1 | 10.1 °C |
| 4 Feb 2025, 09:31 | 7.8 | 7.8 °C |
| 20 Jan 2025, 11:16 | 9.4 | 9.4 °C |
| 2 Dec 2024, 11:11 | 11.1 | 11.1 °C |
| 18 Nov 2024, 09:24 | 12.3 | 12.3 °C |
| 16 Oct 2024, 10:49 | 13.8 | 13.8 °C |
| 16 Sep 2024, 10:49 | 18.9 | 18.9 °C |
| 21 Aug 2024, 10:26 | 19.5 | 19.5 °C |
| 15 Jul 2024, 16:58 | 19 | 19 °C |
| 20 Jun 2024, 12:06 | 18.2 | 18.2 °C |
pH
code 0061
8.05
Sampled 21 Sep 2026, 10 days ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 11:05 | 8.05 | 8.05 |
| 3 Aug 2026, 10:46 | 7.4 | 7.4 |
| 7 Jul 2026, 10:26 | 7.73 | 7.73 |
| 5 Jun 2026, 09:35 | 7.6 | 7.6 |
| 1 May 2026, 14:37 | 7.49 | 7.49 |
| 7 Apr 2026, 10:54 | 7.41 | 7.41 |
| 6 Mar 2026, 10:33 | 7.63 | 7.63 |
| 5 Feb 2026, 10:44 | 8.25 | 8.25 |
| 7 Jan 2026, 11:35 | 7.87 | 7.87 |
| 2 Dec 2025, 11:08 | 7.88 | 7.88 |
| 13 Nov 2025, 10:16 | 6.98 | 6.98 |
| 3 Oct 2025, 11:13 | 7.62 | 7.62 |
| 2 Sep 2025, 14:06 | 7.51 | 7.51 |
| 1 Aug 2025, 10:50 | 7.24 | 7.24 |
| 8 Jul 2025, 09:35 | 7.5 | 7.5 |
| 6 Jun 2025, 10:10 | 6.85 | 6.85 |
| 7 May 2025, 16:38 | 6.82 | 6.82 |
| 1 Apr 2025, 10:09 | 6.87 | 6.87 |
| 11 Mar 2025, 09:44 | 7.48 | 7.48 |
| 4 Feb 2025, 09:31 | 7.73 | 7.73 |
| 20 Jan 2025, 11:16 | 7.4 | 7.4 |
| 2 Dec 2024, 11:11 | 7.66 | 7.66 |
| 18 Nov 2024, 09:24 | 7.5 | 7.5 |
| 16 Oct 2024, 10:49 | 7.64 | 7.64 |
| 16 Sep 2024, 10:49 | 7.16 | 7.16 |
| 21 Aug 2024, 10:26 | 7.06 | 7.06 |
| 15 Jul 2024, 16:58 | 6.96 | 6.96 |
| 20 Jun 2024, 12:06 | 7.02 | 7.02 |
| 3 Apr 2024, 11:10 | 7.39 | 7.39 |
| 4 Jan 2024, 11:35 | 7.64 | 7.64 |
| 9 Oct 2023, 10:31 | 7.1 | 7.1 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.11 mg/l
Sampled 21 Sep 2026, 10 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 11:05 | 0.11 | 0.11 mg/l |
| 3 Aug 2026, 10:46 | 0.055 | 0.055 mg/l |
| 7 Jul 2026, 10:26 | 0.15 | 0.15 mg/l |
| 5 Jun 2026, 09:35 | 0.068 | 0.068 mg/l |
| 1 May 2026, 14:37 | 5.4 | 5.4 mg/l |
| 7 Apr 2026, 10:54 | 0.75 | 0.75 mg/l |
| 6 Mar 2026, 10:33 | 0.34 | 0.34 mg/l |
| 5 Feb 2026, 10:44 | 0.9 | 0.9 mg/l |
| 7 Jan 2026, 11:35 | 1.1 | 1.1 mg/l |
| 2 Dec 2025, 11:08 | 0.41 | 0.41 mg/l |
| 13 Nov 2025, 10:16 | 0.14 | 0.14 mg/l |
| 3 Oct 2025, 11:13 | 0.36 | 0.36 mg/l |
| 2 Sep 2025, 14:06 | 0.84 | 0.84 mg/l |
| 1 Aug 2025, 10:50 | 0.1 | 0.1 mg/l |
| 8 Jul 2025, 09:35 | 0.24 | 0.24 mg/l |
| 6 Jun 2025, 10:10 | 1.2 | 1.2 mg/l |
| 7 May 2025, 16:38 | 7.1 | 7.1 mg/l |
| 1 Apr 2025, 10:09 | 1.9 | 1.9 mg/l |
| 11 Mar 2025, 09:44 | 2 | 2 mg/l |
| 4 Feb 2025, 09:31 | 0.28 | 0.28 mg/l |
| 20 Jan 2025, 11:16 | 0.64 | 0.64 mg/l |
| 2 Dec 2024, 11:11 | 0.63 | 0.63 mg/l |
| 18 Nov 2024, 09:24 | 0.3 | 0.3 mg/l |
| 16 Oct 2024, 10:49 | 0.65 | 0.65 mg/l |
| 16 Sep 2024, 10:49 | 0.082 | 0.082 mg/l |
| 21 Aug 2024, 10:26 | 0.22 | 0.22 mg/l |
| 15 Jul 2024, 16:58 | 2.1 | 2.1 mg/l |
| 20 Jun 2024, 12:06 | 1.4 | 1.4 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
32.9 mg/l
Sampled 21 Sep 2026, 10 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 11:05 | 32.9 | 32.9 mg/l |
| 3 Aug 2026, 10:46 | 32 | 32 mg/l |
| 7 Jul 2026, 10:26 | 25.9 | 25.9 mg/l |
| 5 Jun 2026, 09:35 | 17.9 | 17.9 mg/l |
| 1 May 2026, 14:37 | 34.6 | 34.6 mg/l |
| 7 Apr 2026, 10:54 | 29.5 | 29.5 mg/l |
| 6 Mar 2026, 10:33 | 21.7 | 21.7 mg/l |
| 5 Feb 2026, 10:44 | 11.8 | 11.8 mg/l |
| 7 Jan 2026, 11:35 | 23.4 | 23.4 mg/l |
| 2 Dec 2025, 11:08 | 15.2 | 15.2 mg/l |
| 13 Nov 2025, 10:16 | 18.7 | 18.7 mg/l |
| 3 Oct 2025, 11:13 | 27.7 | 27.7 mg/l |
| 2 Sep 2025, 14:06 | 26.3 | 26.3 mg/l |
| 1 Aug 2025, 10:50 | 35.9 | 35.9 mg/l |
| 8 Jul 2025, 09:35 | 19.8 | 19.8 mg/l |
| 6 Jun 2025, 10:10 | 28.6 | 28.6 mg/l |
| 7 May 2025, 16:38 | 27.8 | 27.8 mg/l |
| 1 Apr 2025, 10:09 | 17.4 | 17.4 mg/l |
| 11 Mar 2025, 09:44 | 9.27 | 9.27 mg/l |
| 4 Feb 2025, 09:31 | 5.93 | 5.93 mg/l |
| 20 Jan 2025, 11:16 | 6.15 | 6.15 mg/l |
| 18 Nov 2024, 09:24 | 9.85 | 9.85 mg/l |
| 16 Oct 2024, 10:49 | 4.22 | 4.22 mg/l |
| 16 Sep 2024, 10:49 | 19.8 | 19.8 mg/l |
| 21 Aug 2024, 10:26 | 23.9 | 23.9 mg/l |
| 15 Jul 2024, 16:58 | 16.2 | 16.2 mg/l |
| 20 Jun 2024, 12:06 | 16.2 | 16.2 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.14 mg/l
Sampled 21 Sep 2026, 10 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 11:05 | 0.14 | 0.14 mg/l |
| 3 Aug 2026, 10:46 | 0.25 | 0.25 mg/l |
| 7 Jul 2026, 10:26 | 0.43 | 0.43 mg/l |
| 5 Jun 2026, 09:35 | 0.25 | 0.25 mg/l |
| 1 May 2026, 14:37 | 0.45 | 0.45 mg/l |
| 7 Apr 2026, 10:54 | 0.066 | 0.066 mg/l |
| 6 Mar 2026, 10:33 | 0.11 | 0.11 mg/l |
| 5 Feb 2026, 10:44 | 0.073 | 0.073 mg/l |
| 7 Jan 2026, 11:35 | 0.11 | 0.11 mg/l |
| 2 Dec 2025, 11:08 | 0.077 | 0.077 mg/l |
| 13 Nov 2025, 10:16 | 0.12 | 0.12 mg/l |
| 3 Oct 2025, 11:13 | 0.19 | 0.19 mg/l |
| 2 Sep 2025, 14:06 | 0.29 | 0.29 mg/l |
| 1 Aug 2025, 10:50 | 0.37 | 0.37 mg/l |
| 8 Jul 2025, 09:35 | 0.14 | 0.14 mg/l |
| 6 Jun 2025, 10:10 | 0.23 | 0.23 mg/l |
| 7 May 2025, 16:38 | 0.5 | 0.5 mg/l |
| 1 Apr 2025, 10:09 | 0.28 | 0.28 mg/l |
| 11 Mar 2025, 09:44 | 0.3 | 0.3 mg/l |
| 4 Feb 2025, 09:31 | 0.13 | 0.13 mg/l |
| 20 Jan 2025, 11:16 | 0.19 | 0.19 mg/l |
| 2 Dec 2024, 11:11 | 0.1 | 0.1 mg/l |
| 18 Nov 2024, 09:24 | 0.23 | 0.23 mg/l |
| 16 Oct 2024, 10:49 | 0.13 | 0.13 mg/l |
| 16 Sep 2024, 10:49 | 0.31 | 0.31 mg/l |
| 21 Aug 2024, 10:26 | 0.57 | 0.57 mg/l |
| 15 Jul 2024, 16:58 | 1.1 | 1.1 mg/l |
| 20 Jun 2024, 12:06 | 0.72 | 0.72 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
1011 µS/cm
Sampled 21 Sep 2026, 10 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 11:05 | 1011 | 1011 µS/cm |
| 3 Aug 2026, 10:46 | 1086 | 1086 µS/cm |
| 7 Jul 2026, 10:26 | 1030 | 1030 µS/cm |
| 5 Jun 2026, 09:35 | 875 | 875 µS/cm |
| 1 May 2026, 14:37 | 1089 | 1089 µS/cm |
| 7 Apr 2026, 10:54 | 986 | 986 µS/cm |
| 6 Mar 2026, 10:33 | 891 | 891 µS/cm |
| 5 Feb 2026, 10:44 | 800 | 800 µS/cm |
| 7 Jan 2026, 11:35 | 1096 | 1096 µS/cm |
| 2 Dec 2025, 11:08 | 909 | 909 µS/cm |
| 13 Nov 2025, 10:16 | 917 | 917 µS/cm |
| 3 Oct 2025, 11:13 | 921 | 921 µS/cm |
| 2 Sep 2025, 14:06 | 1007 | 1007 µS/cm |
| 1 Aug 2025, 10:50 | 1038 | 1038 µS/cm |
| 8 Jul 2025, 09:35 | 431 | 431 µS/cm |
| 6 Jun 2025, 10:10 | 891 | 891 µS/cm |
| 7 May 2025, 16:38 | 908 | 908 µS/cm |
| 1 Apr 2025, 10:09 | 876 | 876 µS/cm |
| 11 Mar 2025, 09:44 | 880 | 880 µS/cm |
| 4 Feb 2025, 09:31 | 863 | 863 µS/cm |
| 20 Jan 2025, 11:16 | 839 | 839 µS/cm |
| 2 Dec 2024, 11:11 | 830 | 830 µS/cm |
| 18 Nov 2024, 09:24 | 848 | 848 µS/cm |
| 16 Oct 2024, 10:49 | 615 | 615 µS/cm |
| 16 Sep 2024, 10:49 | 894 | 894 µS/cm |
| 21 Aug 2024, 10:26 | 893 | 893 µS/cm |
| 15 Jul 2024, 16:58 | 843 | 843 µS/cm |
| 20 Jun 2024, 12:06 | 901 | 901 µS/cm |
Everything measured here
78 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 78 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 28 | Jun 2024 – Sep 2026 | 89.7% 21 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 28 | Jun 2024 – Sep 2026 | 8.93 mg/l 21 Sep 2026 |
| Temperature of Water 0076 | River water | 28 | Jun 2024 – Sep 2026 | 15.5 °C 21 Sep 2026 |
| pH 0061 | River water | 31 | Oct 2023 – Sep 2026 | 8.05 21 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 28 | Jun 2024 – Sep 2026 | 0.11 mg/l 21 Sep 2026 |
| Nitrate as N 0117 | River water | 27 | Jun 2024 – Sep 2026 | 32.9 mg/l 21 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 28 | Jun 2024 – Sep 2026 | 0.14 mg/l 21 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 28 | Jun 2024 – Sep 2026 | 1011 µS/cm 21 Sep 2026 |
| 10:2 Fluorotelomer sulfonic acid 2994 | River water | 1 | Jan 2026 – Jan 2026 | below 0.002 µg/l 7 Jan 2026 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 2 | Jul 2025 – Jan 2026 | below 0.001 µg/l 7 Jan 2026 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 2 | Jul 2025 – Jan 2026 | below 0.001 µg/l 7 Jan 2026 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 2 | Jul 2025 – Jan 2026 | below 0.001 µg/l 7 Jan 2026 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 2 | Jul 2025 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 2 | Jul 2025 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 2 | Jul 2025 – Jan 2026 | below 0.001 µg/l 7 Jan 2026 |
| 2H-Perfluoro-2-decenoic acid 2888 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 7 Jan 2026 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 2 | Jul 2025 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 2 | Jul 2025 – Jan 2026 | below 0.004 µg/l 7 Jan 2026 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 2 | Jul 2025 – Jan 2026 | below 0.001 µg/l 7 Jan 2026 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 2 | Jul 2025 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| 5:1:2 Fluorotelomer betaine 2887 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| 5:3 Fluorotelomer betaine 2886 | River water | 1 | Jan 2026 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| 6:2 Fluorotelomer phosphate diester 2986 | River water | 1 | Jan 2026 – Jan 2026 | below 0.004 µg/l 7 Jan 2026 |
| 6:2 Fluorotelomer sulfonamide amine oxide (6:2 FTNO) (Capstone A) 2841 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 7 Jan 2026 |
| 6:2 Fluorotelomer sulfonamide betaine 2985 | River water | 1 | Jan 2026 – Jan 2026 | 0.0049 µg/l 7 Jan 2026 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 2 | Jul 2025 – Jan 2026 | below 0.001 µg/l 7 Jan 2026 |
| 6:2/8:2 Fluorotelomer phosphate diester 2884 | River water | 1 | Jan 2026 – Jan 2026 | below 0.01 µg/l 7 Jan 2026 |
| 6:6 Perfluorophosphinic acid 2883 | River water | 1 | Jan 2026 – Jan 2026 | below 0.004 µg/l 7 Jan 2026 |
| 6:8 Perfluorophosphinic acid 2882 | River water | 1 | Jan 2026 – Jan 2026 | below 0.01 µg/l 7 Jan 2026 |
| 8:2 Fluorotelomer phosphate diester 2880 | River water | 1 | Jan 2026 – Jan 2026 | below 0.004 µg/l 7 Jan 2026 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 2 | Jul 2025 – Jan 2026 | below 0.001 µg/l 7 Jan 2026 |
| 8:8 Perfluorophosphinic acid 2879 | River water | 1 | Jan 2026 – Jan 2026 | below 0.01 µg/l 7 Jan 2026 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 2 | Jul 2025 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 28 | Jun 2024 – Sep 2026 | 32 mg/l 21 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 28 | Jun 2024 – Sep 2026 | 0.003 mg/l 21 Sep 2026 |
| BOD : 5 Day ATU 0085 | River water | 22 | Jun 2024 – May 2026 | 7.6 mg/l 1 May 2026 |
| Calcium, Dissolved 0239 | River water | 12 | Oct 2023 – Jul 2026 | 62 mg/l 7 Jul 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 12 | Oct 2023 – Jul 2026 | 7.2 mg/l 7 Jul 2026 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 2 | Jul 2025 – Jan 2026 | below 0.001 µg/l 7 Jan 2026 |
| Hexafluoropropylene oxide trimer acid 2980 | River water | 1 | Jan 2026 – Jan 2026 | below 0.001 µg/l 7 Jan 2026 |
| Iron, Dissolved 6460 | River water | 12 | Oct 2023 – Jul 2026 | 48 µg/l 7 Jul 2026 |
| Magnesium, Dissolved 0235 | River water | 12 | Oct 2023 – Jul 2026 | 7.6 mg/l 7 Jul 2026 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 2 | Jul 2025 – Jan 2026 | below 0.002 µg/l 7 Jan 2026 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 2 | Jul 2025 – Jan 2026 | below 0.002 µg/l 7 Jan 2026 |
| Nitrite as N 0118 | River water | 28 | Jun 2024 – Sep 2026 | 0.14 mg/l 21 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 27 | Jun 2024 – Sep 2026 | 33 mg/l 21 Sep 2026 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 2 | Jul 2025 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 2 | Jul 2025 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 2 | Jul 2025 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 2 | Jul 2025 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 2 | Jul 2025 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| Perfluorobutanesulfonic acid 2972 | River water | 2 | Jul 2025 – Jan 2026 | 0.023 µg/l 7 Jan 2026 |
| Perfluorobutanoic acid 2995 | River water | 2 | Jul 2025 – Jan 2026 | 0.025 µg/l 7 Jan 2026 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 2 | Jul 2025 – Jan 2026 | 0.0063 µg/l 7 Jan 2026 |
| Perfluorodecanesulfonic acid 2969 | River water | 2 | Jul 2025 – Jan 2026 | below 0.001 µg/l 7 Jan 2026 |
| Perfluorodecanoic acid 8892 | River water | 2 | Jul 2025 – Jan 2026 | 0.01 µg/l 7 Jan 2026 |
| Perfluorododecane sulfonic acid 2968 | River water | 2 | Jul 2025 – Jan 2026 | below 0.005 µg/l 7 Jan 2026 |
| Perfluorododecanoic acid 8894 | River water | 2 | Jul 2025 – Jan 2026 | below 0.002 µg/l 7 Jan 2026 |
| Perfluoroheptanesulfonic acid 2967 | River water | 2 | Jul 2025 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| Perfluoroheptanoic acid 8889 | River water | 2 | Jul 2025 – Jan 2026 | 0.0032 µg/l 7 Jan 2026 |
| Perfluorohexanesulfonamide 2965 | River water | 2 | Jul 2025 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 2 | Jul 2025 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 2 | Jul 2025 – Jan 2026 | 0.0013 µg/l 7 Jan 2026 |
| Perfluorohexanoic acid 8888 | River water | 2 | Jul 2025 – Jan 2026 | 0.011 µg/l 7 Jan 2026 |
| Perfluorononanesulfonic acid 2963 | River water | 2 | Jul 2025 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| Perfluorononanoic acid 8891 | River water | 2 | Jul 2025 – Jan 2026 | 0.001 µg/l 7 Jan 2026 |
| Perfluorooctadecanoic acid 2962 | River water | 2 | Jul 2025 – Jan 2026 | below 0.002 µg/l 7 Jan 2026 |
| Perfluorooctanesulfonamide 2961 | River water | 2 | Jul 2025 – Jan 2026 | below 0.001 µg/l 7 Jan 2026 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 2 | Jul 2025 – Jan 2026 | 0.00068 µg/l 7 Jan 2026 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 2 | Jul 2025 – Jan 2026 | 0.00051 µg/l 7 Jan 2026 |
| Perfluorooctanesulfonic acid (total) 2958 | River water | 1 | Jan 2026 – Jan 2026 | 0.0012 µg/l 7 Jan 2026 |
| Perfluorooctanoic acid 8890 | River water | 2 | Jul 2025 – Jan 2026 | 0.035 µg/l 7 Jan 2026 |
| Perfluoropentanesulfonic acid 2957 | River water | 2 | Jul 2025 – Jan 2026 | below 0.0005 µg/l 7 Jan 2026 |
| Perfluoropentanoic acid 8887 | River water | 1 | Jul 2025 – Jul 2025 | 0.0089 µg/l 8 Jul 2025 |
| Perfluorotetradecanoic acid 8895 | River water | 2 | Jul 2025 – Jan 2026 | below 0.006 µg/l 7 Jan 2026 |
| Perfluorotridecanoic acid 2955 | River water | 2 | Jul 2025 – Jan 2026 | below 0.002 µg/l 7 Jan 2026 |
| Perfluoroundecane sulfonic acid 2953 | River water | 2 | Jul 2025 – Jan 2026 | below 0.004 µg/l 7 Jan 2026 |
| Perfluoroundecanoic acid 8893 | River water | 2 | Jul 2025 – Jan 2026 | below 0.001 µg/l 7 Jan 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.