Thames at Days Lock
EA name: THAMES AT DAYS LOCK
Environment Agency sampling point TH-PTHR0083 · 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
- 4 Sep 2026, 15:3127 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 32 since 20 Oct 2023 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Planned investigation (national agency policy)
- Where
- National Grid 456760, 193498As published, to the nearest 1 m. Open in a map
- River, by its own name
- Thames
- River, by the map
- River ThamesPlaced on the river its name gives, 78 m from the line.
- Next gauge downstream
- Benson Lock On the River Thames · 6.2 km along the river
- Nearest gauge upstream
- Days Lock On the River Thames · 0.2 km along the river
- Why it was sampled
- Monitoring (national agency policy) (19 samples)
Planned investigation (national agency policy) (13 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
86.1%
Sampled 4 Sep 2026, 27 days ago · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 15:31 | 86.1 | 86.1% |
| 19 Aug 2026, 12:54 | 92.9 | 92.9% |
| 17 Jul 2026, 13:28 | 132.1 | 132.1% |
| 5 Jun 2026, 09:15 | 91.8 | 91.8% |
| 20 May 2026, 14:09 | 93.4 | 93.4% |
| 15 Apr 2026, 14:22 | 105.8 | 105.8% |
| 4 Mar 2026, 13:34 | 100.5 | 100.5% |
| 5 Feb 2026, 14:24 | 93.7 | 93.7% |
| 19 Jan 2026, 15:04 | 93 | 93% |
| 1 Dec 2025, 15:44 | 98.5 | 98.5% |
| 6 Nov 2025, 11:36 | 93.2 | 93.2% |
| 1 Oct 2025, 09:00 | 87.3 | 87.3% |
| 25 Apr 2025, 14:32 | 102.7 | 102.7% |
| 13 Mar 2025, 12:52 | 102.4 | 102.4% |
| 11 Feb 2025, 13:19 | 98.1 | 98.1% |
| 23 Jan 2025, 08:32 | 101.2 | 101.2% |
| 9 Dec 2024, 13:48 | 93.8 | 93.8% |
| 20 Nov 2024, 13:40 | 96.7 | 96.7% |
| 17 Oct 2024, 08:40 | 97.6 | 97.6% |
| 18 Sep 2024, 08:32 | 100.6 | 100.6% |
| 2 Sep 2024, 13:11 | 97.2 | 97.2% |
| 19 Jul 2024, 14:34 | 103.8 | 103.8% |
| 19 Jun 2024, 13:33 | 100.9 | 100.9% |
| 13 May 2024, 14:15 | 100.8 | 100.8% |
| 23 Apr 2024, 12:39 | 105.2 | 105.2% |
| 18 Mar 2024, 10:01 | 97.7 | 97.7% |
| 21 Feb 2024, 08:35 | 88.6 | 88.6% |
| 18 Jan 2024, 09:12 | 94.7 | 94.7% |
| 12 Dec 2023, 08:43 | 93.8 | 93.8% |
| 27 Nov 2023, 08:53 | 98.3 | 98.3% |
| 13 Nov 2023, 12:39 | 94.2 | 94.2% |
| 20 Oct 2023, 14:36 | 92.4 | 92.4% |
Dissolved oxygen
as O2 · code 9924 · mg/l
7.92 mg/l
Sampled 4 Sep 2026, 27 days ago · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 15:31 | 7.92 | 7.92 mg/l |
| 19 Aug 2026, 12:54 | 8.14 | 8.14 mg/l |
| 17 Jul 2026, 13:28 | 11.1 | 11.1 mg/l |
| 5 Jun 2026, 09:15 | 8.78 | 8.78 mg/l |
| 20 May 2026, 14:09 | 9.48 | 9.48 mg/l |
| 15 Apr 2026, 14:22 | 11.2 | 11.2 mg/l |
| 4 Mar 2026, 13:34 | 11.2 | 11.2 mg/l |
| 5 Feb 2026, 14:24 | 11.4 | 11.4 mg/l |
| 19 Jan 2026, 15:04 | 11.2 | 11.2 mg/l |
| 1 Dec 2025, 15:44 | 11.5 | 11.5 mg/l |
| 6 Nov 2025, 11:36 | 9.98 | 9.98 mg/l |
| 1 Oct 2025, 09:00 | 9.01 | 9.01 mg/l |
| 25 Apr 2025, 14:32 | 10.8 | 10.8 mg/l |
| 13 Mar 2025, 12:52 | 12 | 12 mg/l |
| 11 Feb 2025, 13:19 | 12.3 | 12.3 mg/l |
| 23 Jan 2025, 08:32 | 13 | 13 mg/l |
| 9 Dec 2024, 13:48 | 11.4 | 11.4 mg/l |
| 20 Nov 2024, 13:40 | 11.7 | 11.7 mg/l |
| 17 Oct 2024, 08:40 | 10.4 | 10.4 mg/l |
| 18 Sep 2024, 08:32 | 10.1 | 10.1 mg/l |
| 2 Sep 2024, 13:11 | 8.99 | 8.99 mg/l |
| 19 Jul 2024, 14:34 | 9.2 | 9.2 mg/l |
| 19 Jun 2024, 13:33 | 9.65 | 9.65 mg/l |
| 13 May 2024, 14:15 | 9.6 | 9.6 mg/l |
| 23 Apr 2024, 12:39 | 11.5 | 11.5 mg/l |
| 18 Mar 2024, 10:01 | 10.9 | 10.9 mg/l |
| 21 Feb 2024, 08:35 | 10.1 | 10.1 mg/l |
| 18 Jan 2024, 09:12 | 13.1 | 13.1 mg/l |
| 12 Dec 2023, 08:43 | 11.2 | 11.2 mg/l |
| 27 Nov 2023, 08:53 | 11.9 | 11.9 mg/l |
| 13 Nov 2023, 12:39 | 11 | 11 mg/l |
| 20 Oct 2023, 14:36 | 9.73 | 9.73 mg/l |
Water temperature
code 0076 · °C
19.3 °C
Sampled 4 Sep 2026, 27 days ago · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 15:31 | 19.3 | 19.3 °C |
| 19 Aug 2026, 12:54 | 21.8 | 21.8 °C |
| 17 Jul 2026, 13:28 | 24 | 24 °C |
| 5 Jun 2026, 09:15 | 17.4 | 17.4 °C |
| 20 May 2026, 14:09 | 14.6 | 14.6 °C |
| 15 Apr 2026, 14:22 | 12.5 | 12.5 °C |
| 4 Mar 2026, 13:34 | 10.5 | 10.5 °C |
| 5 Feb 2026, 14:24 | 7 | 7 °C |
| 19 Jan 2026, 15:04 | 7.4 | 7.4 °C |
| 1 Dec 2025, 15:44 | 8.5 | 8.5 °C |
| 6 Nov 2025, 11:36 | 12.2 | 12.2 °C |
| 1 Oct 2025, 09:00 | 13.8 | 13.8 °C |
| 25 Apr 2025, 14:32 | 13.1 | 13.1 °C |
| 13 Mar 2025, 12:52 | 8.2 | 8.2 °C |
| 11 Feb 2025, 13:19 | 5.7 | 5.7 °C |
| 23 Jan 2025, 08:32 | 4.6 | 4.6 °C |
| 9 Dec 2024, 13:48 | 6.8 | 6.8 °C |
| 20 Nov 2024, 13:40 | 7.2 | 7.2 °C |
| 17 Oct 2024, 08:40 | 12.6 | 12.6 °C |
| 18 Sep 2024, 08:32 | 15.1 | 15.1 °C |
| 2 Sep 2024, 13:11 | 19 | 19 °C |
| 19 Jul 2024, 14:34 | 21.2 | 21.2 °C |
| 19 Jun 2024, 13:33 | 17.4 | 17.4 °C |
| 13 May 2024, 14:15 | 17.6 | 17.6 °C |
| 23 Apr 2024, 12:39 | 11.3 | 11.3 °C |
| 18 Mar 2024, 10:01 | 10.4 | 10.4 °C |
| 21 Feb 2024, 08:35 | 9.6 | 9.6 °C |
| 18 Jan 2024, 09:12 | 1.8 | 1.8 °C |
| 12 Dec 2023, 08:43 | 7.7 | 7.7 °C |
| 27 Nov 2023, 08:53 | 6.9 | 6.9 °C |
| 13 Nov 2023, 12:39 | 8.6 | 8.6 °C |
| 20 Oct 2023, 14:36 | 12.9 | 12.9 °C |
pH
code 0061
7.91
Sampled 4 Sep 2026, 27 days ago · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 15:31 | 7.91 | 7.91 |
| 19 Aug 2026, 12:54 | 7.96 | 7.96 |
| 17 Jul 2026, 13:28 | 8.63 | 8.63 |
| 5 Jun 2026, 09:15 | 8.02 | 8.02 |
| 20 May 2026, 14:09 | 8.12 | 8.12 |
| 15 Apr 2026, 14:22 | 8.4 | 8.4 |
| 4 Mar 2026, 13:34 | 8.18 | 8.18 |
| 5 Feb 2026, 14:24 | 8.18 | 8.18 |
| 19 Jan 2026, 15:04 | 7.95 | 7.95 |
| 1 Dec 2025, 15:44 | 8.17 | 8.17 |
| 6 Nov 2025, 11:36 | 7.95 | 7.95 |
| 1 Oct 2025, 09:00 | 7.86 | 7.86 |
| 25 Apr 2025, 14:32 | 8.31 | 8.31 |
| 13 Mar 2025, 12:52 | 8.3 | 8.3 |
| 11 Feb 2025, 13:19 | 8.14 | 8.14 |
| 23 Jan 2025, 08:32 | 8.24 | 8.24 |
| 9 Dec 2024, 13:48 | 8.12 | 8.12 |
| 20 Nov 2024, 13:40 | 8.1 | 8.1 |
| 17 Oct 2024, 08:40 | 7.99 | 7.99 |
| 18 Sep 2024, 08:32 | 8.05 | 8.05 |
| 2 Sep 2024, 13:11 | 7.99 | 7.99 |
| 19 Jul 2024, 14:34 | 8.11 | 8.11 |
| 19 Jun 2024, 13:33 | 8.17 | 8.17 |
| 13 May 2024, 14:15 | 8.36 | 8.36 |
| 23 Apr 2024, 12:39 | 8.35 | 8.35 |
| 18 Mar 2024, 10:01 | 8.12 | 8.12 |
| 21 Feb 2024, 08:35 | 8.05 | 8.05 |
| 18 Jan 2024, 09:12 | 8.22 | 8.22 |
| 12 Dec 2023, 08:43 | 8.05 | 8.05 |
| 27 Nov 2023, 08:53 | 8.11 | 8.11 |
| 13 Nov 2023, 12:39 | 7.91 | 7.91 |
| 20 Oct 2023, 14:36 | 7.9 | 7.9 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 4 Sep 2026, 27 days ago · 32 results banked
Every result (32)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 15:31 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Aug 2026, 12:54 | 0.031 | 0.031 mg/l |
| 17 Jul 2026, 13:28 | 0.061 | 0.061 mg/l |
| 5 Jun 2026, 09:15 | 0.066 | 0.066 mg/l |
| 20 May 2026, 14:09 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Apr 2026, 14:22 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Mar 2026, 13:34 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Feb 2026, 14:24 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Jan 2026, 15:04 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Dec 2025, 15:44 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Nov 2025, 11:36 | 0.04 | 0.04 mg/l |
| 1 Oct 2025, 09:00 | 0.048 | 0.048 mg/l |
| 25 Apr 2025, 14:32 | 0.034 | 0.034 mg/l |
| 13 Mar 2025, 12:52 | 0.045 | 0.045 mg/l |
| 11 Feb 2025, 13:19 | 0.091 | 0.091 mg/l |
| 23 Jan 2025, 08:32 | 0.036 | 0.036 mg/l |
| 9 Dec 2024, 13:48 | 0.037 | 0.037 mg/l |
| 20 Nov 2024, 13:40 | 0.086 | 0.086 mg/l |
| 17 Oct 2024, 08:40 | 0.052 | 0.052 mg/l |
| 18 Sep 2024, 08:32 | 0.032 | 0.032 mg/l |
| 2 Sep 2024, 13:11 | 0.054 | 0.054 mg/l |
| 19 Jul 2024, 14:34 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Jun 2024, 13:33 | 0.046 | 0.046 mg/l |
| 13 May 2024, 14:15 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Apr 2024, 12:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Mar 2024, 10:01 | 0.059 | 0.059 mg/l |
| 21 Feb 2024, 08:35 | 0.051 | 0.051 mg/l |
| 18 Jan 2024, 09:12 | 0.09 | 0.09 mg/l |
| 12 Dec 2023, 08:43 | 0.044 | 0.044 mg/l |
| 27 Nov 2023, 08:53 | 0.035 | 0.035 mg/l |
| 13 Nov 2023, 12:39 | 0.034 | 0.034 mg/l |
| 20 Oct 2023, 14:36 | 0.16 | 0.16 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
7.07 mg/l
Sampled 13 Mar 2025, 19 months ago · 19 results banked
Every result (19)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Mar 2025, 12:52 | 7.07 | 7.07 mg/l |
| 11 Feb 2025, 13:19 | 5.86 | 5.86 mg/l |
| 23 Jan 2025, 08:32 | 6.98 | 6.98 mg/l |
| 9 Dec 2024, 13:48 | 4.18 | 4.18 mg/l |
| 20 Nov 2024, 13:40 | 6.38 | 6.38 mg/l |
| 17 Oct 2024, 08:40 | 4.28 | 4.28 mg/l |
| 18 Sep 2024, 08:32 | 7.98 | 7.98 mg/l |
| 2 Sep 2024, 13:11 | 8.18 | 8.18 mg/l |
| 19 Jul 2024, 14:34 | 6.38 | 6.38 mg/l |
| 19 Jun 2024, 13:33 | 6.57 | 6.57 mg/l |
| 13 May 2024, 14:15 | 6.28 | 6.28 mg/l |
| 23 Apr 2024, 12:39 | 6.78 | 6.78 mg/l |
| 18 Mar 2024, 10:01 | 4.96 | 4.96 mg/l |
| 21 Feb 2024, 08:35 | 3.67 | 3.67 mg/l |
| 18 Jan 2024, 09:12 | 6.78 | 6.78 mg/l |
| 12 Dec 2023, 08:43 | 4.97 | 4.97 mg/l |
| 27 Nov 2023, 08:53 | 5.98 | 5.98 mg/l |
| 13 Nov 2023, 12:39 | 4.48 | 4.48 mg/l |
| 20 Oct 2023, 14:36 | 5.37 | 5.37 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.08 mg/l
Sampled 13 Mar 2025, 19 months ago · 19 results banked
Every result (19)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Mar 2025, 12:52 | 0.08 | 0.08 mg/l |
| 11 Feb 2025, 13:19 | 0.091 | 0.091 mg/l |
| 23 Jan 2025, 08:32 | 0.08 | 0.08 mg/l |
| 9 Dec 2024, 13:48 | 0.089 | 0.089 mg/l |
| 20 Nov 2024, 13:40 | 0.13 | 0.13 mg/l |
| 17 Oct 2024, 08:40 | 0.071 | 0.071 mg/l |
| 18 Sep 2024, 08:32 | 0.24 | 0.24 mg/l |
| 2 Sep 2024, 13:11 | 0.23 | 0.23 mg/l |
| 19 Jul 2024, 14:34 | 0.19 | 0.19 mg/l |
| 19 Jun 2024, 13:33 | 0.15 | 0.15 mg/l |
| 13 May 2024, 14:15 | 0.11 | 0.11 mg/l |
| 23 Apr 2024, 12:39 | 0.092 | 0.092 mg/l |
| 18 Mar 2024, 10:01 | 0.064 | 0.064 mg/l |
| 21 Feb 2024, 08:35 | 0.081 | 0.081 mg/l |
| 18 Jan 2024, 09:12 | 0.079 | 0.079 mg/l |
| 12 Dec 2023, 08:43 | 0.1 | 0.1 mg/l |
| 27 Nov 2023, 08:53 | 0.09 | 0.09 mg/l |
| 13 Nov 2023, 12:39 | 0.091 | 0.091 mg/l |
| 20 Oct 2023, 14:36 | 0.21 | 0.21 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
642 µS/cm
Sampled 13 Mar 2025, 19 months ago · 19 results banked
Every result (19)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Mar 2025, 12:52 | 642 | 642 µS/cm |
| 11 Feb 2025, 13:19 | 613 | 613 µS/cm |
| 23 Jan 2025, 08:32 | 644 | 644 µS/cm |
| 9 Dec 2024, 13:48 | 533 | 533 µS/cm |
| 20 Nov 2024, 13:40 | 636 | 636 µS/cm |
| 17 Oct 2024, 08:40 | 588 | 588 µS/cm |
| 18 Sep 2024, 08:32 | 679 | 679 µS/cm |
| 2 Sep 2024, 13:11 | 724 | 724 µS/cm |
| 19 Jul 2024, 14:34 | 645 | 645 µS/cm |
| 19 Jun 2024, 13:33 | 659 | 659 µS/cm |
| 13 May 2024, 14:15 | 644 | 644 µS/cm |
| 23 Apr 2024, 12:39 | 624 | 624 µS/cm |
| 18 Mar 2024, 10:01 | 577 | 577 µS/cm |
| 21 Feb 2024, 08:35 | 481 | 481 µS/cm |
| 18 Jan 2024, 09:12 | 637 | 637 µS/cm |
| 12 Dec 2023, 08:43 | 568 | 568 µS/cm |
| 27 Nov 2023, 08:53 | 647 | 647 µS/cm |
| 13 Nov 2023, 12:39 | 564 | 564 µS/cm |
| 20 Oct 2023, 14:36 | 614 | 614 µS/cm |
Everything measured here
61 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 61 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 32 | Oct 2023 – Sep 2026 | 86.1% 4 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 32 | Oct 2023 – Sep 2026 | 7.92 mg/l 4 Sep 2026 |
| Temperature of Water 0076 | River water | 32 | Oct 2023 – Sep 2026 | 19.3 °C 4 Sep 2026 |
| pH 0061 | River water | 32 | Oct 2023 – Sep 2026 | 7.91 4 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 32 | Oct 2023 – Sep 2026 | below 0.03 mg/l 4 Sep 2026 |
| Nitrate as N 0117 | River water | 19 | Oct 2023 – Mar 2025 | 7.07 mg/l 13 Mar 2025 |
| Orthophosphate, reactive as P 0180 | River water | 19 | Oct 2023 – Mar 2025 | 0.08 mg/l 13 Mar 2025 |
| Conductivity at 25 C 0077 | River water | 19 | Oct 2023 – Mar 2025 | 642 µS/cm 13 Mar 2025 |
| 11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (F-53B Minor) 2993 | River water | 2 | Jun 2024 – Sep 2024 | below 0.001 µg/l 2 Sep 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (B) 2942 | River water | 2 | Jun 2024 – Sep 2024 | below 0.001 µg/l 2 Sep 2024 |
| 2-(N-Ethylperfluorooctanesulfonamido)acetic acid (L) 2991 | River water | 2 | Jun 2024 – Sep 2024 | below 0.001 µg/l 2 Sep 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (B) 2943 | River water | 2 | Jun 2024 – Sep 2024 | below 0.002 µg/l 2 Sep 2024 |
| 2-(N-Methylperfluorooctanesulfonamido)acetic acid (L) 2990 | River water | 2 | Jun 2024 – Sep 2024 | below 0.0005 µg/l 2 Sep 2024 |
| 2H,2H,3H,3H-Perfluorooctanoic acid 2989 | River water | 2 | Jun 2024 – Sep 2024 | below 0.001 µg/l 2 Sep 2024 |
| 3-Perfluoroheptylpropanoic acid 2925 | River water | 2 | Jun 2024 – Sep 2024 | below 0.0005 µg/l 2 Sep 2024 |
| 3:3 Fluorotelomer carboxylic acid 2926 | River water | 2 | Jun 2024 – Sep 2024 | below 0.004 µg/l 2 Sep 2024 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) 2988 | River water | 2 | Jun 2024 – Sep 2024 | below 0.005 µg/l 2 Sep 2024 |
| 4:2 Fluorotelomer sulfonic acid 2987 | River water | 2 | Jun 2024 – Sep 2024 | below 0.0005 µg/l 2 Sep 2024 |
| 6:2 Fluorotelomer sulfonic acid 2984 | River water | 2 | Jun 2024 – Sep 2024 | 0.0035 µg/l 2 Sep 2024 |
| 8:2 Fluorotelomer sulfonic acid 2983 | River water | 2 | Jun 2024 – Sep 2024 | below 0.001 µg/l 2 Sep 2024 |
| 9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid 2982 | River water | 2 | Jun 2024 – Sep 2024 | below 0.0005 µg/l 2 Sep 2024 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 19 | Oct 2023 – Mar 2025 | 240 mg/l 13 Mar 2025 |
| Ammonia un-ionised as N 0119 | River water | 19 | Oct 2023 – Mar 2025 | 0.00072 mg/l 13 Mar 2025 |
| BOD : 5 Day ATU 0085 | River water | 27 | Feb 2024 – Sep 2026 | below 3 mg/l 4 Sep 2026 |
| Hexafluoropropylene oxide dimer acid (Gen X) 2981 | River water | 2 | Jun 2024 – Sep 2024 | below 0.001 µg/l 2 Sep 2024 |
| N-Ethylperfluorooctanesulfonamide 2977 | River water | 2 | Jun 2024 – Sep 2024 | below 0.002 µg/l 2 Sep 2024 |
| N-methylperfluorooctanesulfonamide 2975 | River water | 2 | Jun 2024 – Sep 2024 | below 0.002 µg/l 2 Sep 2024 |
| Nitrite as N 0118 | River water | 19 | Oct 2023 – Mar 2025 | 0.033 mg/l 13 Mar 2025 |
| Nitrogen, Total Oxidised as N 0116 | River water | 19 | Oct 2023 – Mar 2025 | 7.1 mg/l 13 Mar 2025 |
| Perfluoro(2-ethoxyethane)sulfonic acid 2924 | River water | 2 | Jun 2024 – Sep 2024 | below 0.0005 µg/l 2 Sep 2024 |
| Perfluoro(4-methoxybutanoic) acid 2923 | River water | 2 | Jun 2024 – Sep 2024 | below 0.0005 µg/l 2 Sep 2024 |
| Perfluoro-3,6-dioxaheptanoic acid 2922 | River water | 2 | Jun 2024 – Sep 2024 | below 0.0005 µg/l 2 Sep 2024 |
| Perfluoro-3-methoxypropanoic acid 2921 | River water | 2 | Jun 2024 – Sep 2024 | below 0.0005 µg/l 2 Sep 2024 |
| Perfluoro-4-ethylcyclohexanesulfonic acid 2973 | River water | 2 | Jun 2024 – Sep 2024 | below 0.0005 µg/l 2 Sep 2024 |
| Perfluorobutanesulfonic acid 2972 | River water | 2 | Jun 2024 – Sep 2024 | 0.0043 µg/l 2 Sep 2024 |
| Perfluorobutanoic acid 2995 | River water | 2 | Jun 2024 – Sep 2024 | 0.0037 µg/l 2 Sep 2024 |
| Perfluorobutylsulfonamide (perfluorobutane sulfonamide) 2970 | River water | 2 | Jun 2024 – Sep 2024 | 0.00097 µg/l 2 Sep 2024 |
| Perfluorodecanesulfonic acid 2969 | River water | 2 | Jun 2024 – Sep 2024 | below 0.002 µg/l 2 Sep 2024 |
| Perfluorodecanoic acid 8892 | River water | 2 | Jun 2024 – Sep 2024 | below 0.002 µg/l 2 Sep 2024 |
| Perfluorododecane sulfonic acid 2968 | River water | 2 | Jun 2024 – Sep 2024 | below 0.005 µg/l 2 Sep 2024 |
| Perfluorododecanoic acid 8894 | River water | 2 | Jun 2024 – Sep 2024 | below 0.002 µg/l 2 Sep 2024 |
| Perfluoroheptanesulfonic acid 2967 | River water | 2 | Jun 2024 – Sep 2024 | below 0.0005 µg/l 2 Sep 2024 |
| Perfluoroheptanoic acid 8889 | River water | 2 | Jun 2024 – Sep 2024 | 0.0017 µg/l 2 Sep 2024 |
| Perfluorohexanesulfonamide 2965 | River water | 2 | Jun 2024 – Sep 2024 | below 0.0005 µg/l 2 Sep 2024 |
| Perfluorohexanesulfonic acid (B) 2944 | River water | 2 | Jun 2024 – Sep 2024 | 0.00062 µg/l 2 Sep 2024 |
| Perfluorohexanesulfonic acid (L) 2964 | River water | 2 | Jun 2024 – Sep 2024 | 0.0033 µg/l 2 Sep 2024 |
| Perfluorohexanoic acid 8888 | River water | 2 | Jun 2024 – Sep 2024 | 0.0053 µg/l 2 Sep 2024 |
| Perfluorononanesulfonic acid 2963 | River water | 2 | Jun 2024 – Sep 2024 | below 0.0005 µg/l 2 Sep 2024 |
| Perfluorononanoic acid 8891 | River water | 2 | Jun 2024 – Sep 2024 | below 0.001 µg/l 2 Sep 2024 |
| Perfluorooctadecanoic acid 2962 | River water | 2 | Jun 2024 – Sep 2024 | below 0.002 µg/l 2 Sep 2024 |
| Perfluorooctanesulfonamide 2961 | River water | 2 | Jun 2024 – Sep 2024 | below 0.001 µg/l 2 Sep 2024 |
| Perfluorooctanesulfonic acid (branched) 2960 | River water | 2 | Jun 2024 – Sep 2024 | 0.0015 µg/l 2 Sep 2024 |
| Perfluorooctanesulfonic acid (linear) 2959 | River water | 2 | Jun 2024 – Sep 2024 | 0.0026 µg/l 2 Sep 2024 |
| Perfluorooctanoic acid 8890 | River water | 2 | Jun 2024 – Sep 2024 | 0.0027 µg/l 2 Sep 2024 |
| Perfluoropentanesulfonic acid 2957 | River water | 2 | Jun 2024 – Sep 2024 | below 0.0005 µg/l 2 Sep 2024 |
| Perfluoropentanoic acid 8887 | River water | 2 | Jun 2024 – Sep 2024 | 0.0055 µg/l 2 Sep 2024 |
| Perfluorotetradecanoic acid 8895 | River water | 2 | Jun 2024 – Sep 2024 | below 0.006 µg/l 2 Sep 2024 |
| Perfluorotridecanoic acid 2955 | River water | 2 | Jun 2024 – Sep 2024 | below 0.005 µg/l 2 Sep 2024 |
| Perfluoroundecane sulfonic acid 2953 | River water | 2 | Jun 2024 – Sep 2024 | below 0.004 µg/l 2 Sep 2024 |
| Perfluoroundecanoic acid 8893 | River water | 2 | Jun 2024 – Sep 2024 | below 0.002 µg/l 2 Sep 2024 |
| Phosphorus, Total as P 0348 | River water | 13 | Apr 2025 – Sep 2026 | 0.28 mg/l 4 Sep 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.