Lee at Holwell Bridge
EA name: LEE AT HOLWELL BRIDGE
Environment Agency sampling point TH-PLER0065 · 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
- 6 Aug 2026, 14:2956 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 31 since 1 Nov 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 527620, 209820As published, to the nearest 10 m. Open in a map
- River, by its own name
- Lee
- River, by the map
- River LeaPlaced on the river its name gives, 1 m from the line.
- Next gauge downstream
- Waterhall On the River Lee · 3.3 km along the river
- Nearest gauge upstream
- Harpenden On the River Lee · 20 km along the river
- Why it was sampled
- Monitoring (national agency policy) (27 samples)
Environmental monitoring statutory (EU directives) (2 samples)
Planned investigation (local monitoring) (2 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
94.4%
Sampled 6 Aug 2026, 56 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 Aug 2026, 14:29 | 94.4 | 94.4% |
| 7 Jul 2026, 13:25 | 98.4 | 98.4% |
| 16 Jun 2026, 13:16 | 96.2 | 96.2% |
| 19 May 2026, 13:30 | 97.3 | 97.3% |
| 8 Apr 2026, 12:23 | 119.8 | 119.8% |
| 2 Mar 2026, 10:07 | 90.8 | 90.8% |
| 3 Feb 2026, 15:02 | 93.6 | 93.6% |
| 9 Jan 2026, 13:07 | 96.3 | 96.3% |
| 3 Dec 2025, 14:30 | 92.6 | 92.6% |
| 4 Nov 2025, 11:35 | 91 | 91% |
| 1 Oct 2025, 12:50 | 91.7 | 91.7% |
| 1 Sep 2025, 13:20 | 91.7 | 91.7% |
| 1 Aug 2025, 15:09 | 98.3 | 98.3% |
| 4 Jul 2025, 14:23 | 99.1 | 99.1% |
| 16 Jun 2025, 10:51 | 95.7 | 95.7% |
| 8 May 2025, 11:14 | 105.5 | 105.5% |
| 2 Apr 2025, 14:30 | 114.9 | 114.9% |
| 4 Mar 2025, 11:07 | 104.9 | 104.9% |
| 6 Feb 2025, 13:44 | 98 | 98% |
| 8 Jan 2025, 12:25 | 99.1 | 99.1% |
| 2 Dec 2024, 09:46 | 94.6 | 94.6% |
| 12 Nov 2024, 08:45 | 93.2 | 93.2% |
| 8 Oct 2024, 12:23 | 93.1 | 93.1% |
| 9 Sep 2024, 11:37 | 87.4 | 87.4% |
| 2 Aug 2024, 09:18 | 89.1 | 89.1% |
| 1 Jul 2024, 11:27 | 96.8 | 96.8% |
| 4 Jun 2024, 15:04 | 108.6 | 108.6% |
Dissolved oxygen
as O2 · code 9924 · mg/l
8.75 mg/l
Sampled 6 Aug 2026, 56 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 Aug 2026, 14:29 | 8.75 | 8.75 mg/l |
| 7 Jul 2026, 13:25 | 8.47 | 8.47 mg/l |
| 16 Jun 2026, 13:16 | 8.99 | 8.99 mg/l |
| 19 May 2026, 13:30 | 9.89 | 9.89 mg/l |
| 8 Apr 2026, 12:23 | 12.5 | 12.5 mg/l |
| 2 Mar 2026, 10:07 | 10.1 | 10.1 mg/l |
| 3 Feb 2026, 15:02 | 11.2 | 11.2 mg/l |
| 9 Jan 2026, 13:07 | 12 | 12 mg/l |
| 3 Dec 2025, 14:30 | 10.9 | 10.9 mg/l |
| 4 Nov 2025, 11:35 | 9.74 | 9.74 mg/l |
| 1 Oct 2025, 12:50 | 9.6 | 9.6 mg/l |
| 1 Sep 2025, 13:20 | 8.86 | 8.86 mg/l |
| 1 Aug 2025, 15:09 | 9.32 | 9.32 mg/l |
| 4 Jul 2025, 14:23 | 8.88 | 8.88 mg/l |
| 16 Jun 2025, 10:51 | 8.85 | 8.85 mg/l |
| 8 May 2025, 11:14 | 11.1 | 11.1 mg/l |
| 2 Apr 2025, 14:30 | 12 | 12 mg/l |
| 4 Mar 2025, 11:07 | 12.4 | 12.4 mg/l |
| 6 Feb 2025, 13:44 | 11.9 | 11.9 mg/l |
| 8 Jan 2025, 12:25 | 12.7 | 12.7 mg/l |
| 2 Dec 2024, 09:46 | 10.7 | 10.7 mg/l |
| 12 Nov 2024, 08:45 | 10.7 | 10.7 mg/l |
| 8 Oct 2024, 12:23 | 9.42 | 9.42 mg/l |
| 9 Sep 2024, 11:37 | 8.44 | 8.44 mg/l |
| 2 Aug 2024, 09:18 | 7.99 | 7.99 mg/l |
| 1 Jul 2024, 11:27 | 9.2 | 9.2 mg/l |
| 4 Jun 2024, 15:04 | 10.5 | 10.5 mg/l |
Water temperature
code 0076 · °C
18.9 °C
Sampled 6 Aug 2026, 56 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 Aug 2026, 14:29 | 18.9 | 18.9 °C |
| 7 Jul 2026, 13:25 | 22.7 | 22.7 °C |
| 16 Jun 2026, 13:16 | 18.5 | 18.5 °C |
| 19 May 2026, 13:30 | 14.5 | 14.5 °C |
| 8 Apr 2026, 12:23 | 13.5 | 13.5 °C |
| 2 Mar 2026, 10:07 | 10.5 | 10.5 °C |
| 3 Feb 2026, 15:02 | 7.6 | 7.6 °C |
| 9 Jan 2026, 13:07 | 5.8 | 5.8 °C |
| 3 Dec 2025, 14:30 | 8.3 | 8.3 °C |
| 4 Nov 2025, 11:35 | 12.2 | 12.2 °C |
| 1 Oct 2025, 12:50 | 13.2 | 13.2 °C |
| 1 Sep 2025, 13:20 | 16.9 | 16.9 °C |
| 1 Aug 2025, 15:09 | 17.8 | 17.8 °C |
| 4 Jul 2025, 14:23 | 20.6 | 20.6 °C |
| 16 Jun 2025, 10:51 | 19 | 19 °C |
| 8 May 2025, 11:14 | 12.8 | 12.8 °C |
| 2 Apr 2025, 14:30 | 13.4 | 13.4 °C |
| 4 Mar 2025, 11:07 | 8 | 8 °C |
| 6 Feb 2025, 13:44 | 7 | 7 °C |
| 8 Jan 2025, 12:25 | 4.7 | 4.7 °C |
| 2 Dec 2024, 09:46 | 9.8 | 9.8 °C |
| 12 Nov 2024, 08:45 | 9.4 | 9.4 °C |
| 8 Oct 2024, 12:23 | 14.7 | 14.7 °C |
| 9 Sep 2024, 11:37 | 16.9 | 16.9 °C |
| 2 Aug 2024, 09:18 | 20.6 | 20.6 °C |
| 1 Jul 2024, 11:27 | 17.7 | 17.7 °C |
| 4 Jun 2024, 15:04 | 16.9 | 16.9 °C |
pH
code 0061
7.97
Sampled 6 Aug 2026, 56 days ago · 30 results banked
Every result (30)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 Aug 2026, 14:29 | 7.97 | 7.97 |
| 7 Jul 2026, 13:25 | 8.18 | 8.18 |
| 16 Jun 2026, 13:16 | 7.92 | 7.92 |
| 19 May 2026, 13:30 | 8.25 | 8.25 |
| 8 Apr 2026, 12:23 | 8.41 | 8.41 |
| 2 Mar 2026, 10:07 | 8.06 | 8.06 |
| 3 Feb 2026, 15:02 | 8.05 | 8.05 |
| 9 Jan 2026, 13:07 | 8.22 | 8.22 |
| 3 Dec 2025, 14:30 | 7.95 | 7.95 |
| 4 Nov 2025, 11:35 | 7.97 | 7.97 |
| 1 Oct 2025, 12:50 | 7.81 | 7.81 |
| 1 Sep 2025, 13:20 | 7.97 | 7.97 |
| 1 Aug 2025, 15:09 | 8.2 | 8.2 |
| 4 Jul 2025, 14:23 | 8.29 | 8.29 |
| 16 Jun 2025, 10:51 | 8.16 | 8.16 |
| 8 May 2025, 11:14 | 8.24 | 8.24 |
| 2 Apr 2025, 14:30 | 8.32 | 8.32 |
| 4 Mar 2025, 11:07 | 8.15 | 8.15 |
| 6 Feb 2025, 13:44 | 8.08 | 8.08 |
| 8 Jan 2025, 12:25 | 8.19 | 8.19 |
| 2 Dec 2024, 09:46 | 7.8 | 7.8 |
| 12 Nov 2024, 08:45 | 7.9 | 7.9 |
| 8 Oct 2024, 12:23 | 7.97 | 7.97 |
| 9 Sep 2024, 11:37 | 7.86 | 7.86 |
| 2 Aug 2024, 09:18 | 8.05 | 8.05 |
| 1 Jul 2024, 11:27 | 8.16 | 8.16 |
| 1 May 2024, 12:15 | 8.06 | 8.06 |
| 15 Apr 2024, 12:06 | 8.12 | 8.12 |
| 8 Feb 2024, 08:53 | 8.16 | 8.16 |
| 1 Nov 2023, 15:19 | 7.82 | 7.82 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 6 Aug 2026, 56 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 Aug 2026, 14:29 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Jul 2026, 13:25 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Jun 2026, 13:16 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 May 2026, 13:30 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Apr 2026, 12:23 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Mar 2026, 10:07 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Feb 2026, 15:02 | 0.095 | 0.095 mg/l |
| 9 Jan 2026, 13:07 | 0.18 | 0.18 mg/l |
| 3 Dec 2025, 14:30 | 0.049 | 0.049 mg/l |
| 4 Nov 2025, 11:35 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Oct 2025, 12:50 | 0.059 | 0.059 mg/l |
| 1 Sep 2025, 13:20 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Aug 2025, 15:09 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Jul 2025, 14:23 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Jun 2025, 10:51 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 May 2025, 11:14 | 0.033 | 0.033 mg/l |
| 2 Apr 2025, 14:30 | 0.054 | 0.054 mg/l |
| 4 Mar 2025, 11:07 | 0.046 | 0.046 mg/l |
| 6 Feb 2025, 13:44 | 0.065 | 0.065 mg/l |
| 8 Jan 2025, 12:25 | 0.044 | 0.044 mg/l |
| 2 Dec 2024, 09:46 | 0.048 | 0.048 mg/l |
| 12 Nov 2024, 08:45 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Oct 2024, 12:23 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Sep 2024, 11:37 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Aug 2024, 09:18 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Jul 2024, 11:27 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Jun 2024, 15:04 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
11 mg/l
Sampled 6 Aug 2026, 56 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 Aug 2026, 14:29 | 11 | 11 mg/l |
| 7 Jul 2026, 13:25 | 11 | 11 mg/l |
| 16 Jun 2026, 13:16 | 9.96 | 9.96 mg/l |
| 19 May 2026, 13:30 | 12.9 | 12.9 mg/l |
| 8 Apr 2026, 12:23 | 13 | 13 mg/l |
| 2 Mar 2026, 10:07 | 7.78 | 7.78 mg/l |
| 3 Feb 2026, 15:02 | 10.9 | 10.9 mg/l |
| 9 Jan 2026, 13:07 | 9.93 | 9.93 mg/l |
| 3 Dec 2025, 14:30 | 14.9 | 14.9 mg/l |
| 4 Nov 2025, 11:35 | 15.9 | 15.9 mg/l |
| 1 Oct 2025, 12:50 | 18.9 | 18.9 mg/l |
| 1 Sep 2025, 13:20 | 13 | 13 mg/l |
| 1 Aug 2025, 15:09 | 15 | 15 mg/l |
| 4 Jul 2025, 14:23 | 9.96 | 9.96 mg/l |
| 16 Jun 2025, 10:51 | 8.76 | 8.76 mg/l |
| 8 May 2025, 11:14 | 14 | 14 mg/l |
| 2 Apr 2025, 14:30 | 9.91 | 9.91 mg/l |
| 4 Mar 2025, 11:07 | 10.9 | 10.9 mg/l |
| 6 Feb 2025, 13:44 | 12.9 | 12.9 mg/l |
| 8 Jan 2025, 12:25 | 8.46 | 8.46 mg/l |
| 2 Dec 2024, 09:46 | 10.9 | 10.9 mg/l |
| 12 Nov 2024, 08:45 | 11 | 11 mg/l |
| 8 Oct 2024, 12:23 | 9.46 | 9.46 mg/l |
| 9 Sep 2024, 11:37 | 9.97 | 9.97 mg/l |
| 2 Aug 2024, 09:18 | 8.47 | 8.47 mg/l |
| 1 Jul 2024, 11:27 | 7.87 | 7.87 mg/l |
| 4 Jun 2024, 15:04 | 11 | 11 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.2 mg/l
Sampled 6 Aug 2026, 56 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 Aug 2026, 14:29 | 0.2 | 0.2 mg/l |
| 7 Jul 2026, 13:25 | 0.29 | 0.29 mg/l |
| 16 Jun 2026, 13:16 | 0.24 | 0.24 mg/l |
| 19 May 2026, 13:30 | 0.23 | 0.23 mg/l |
| 8 Apr 2026, 12:23 | 0.18 | 0.18 mg/l |
| 2 Mar 2026, 10:07 | 0.14 | 0.14 mg/l |
| 3 Feb 2026, 15:02 | 0.19 | 0.19 mg/l |
| 9 Jan 2026, 13:07 | 0.18 | 0.18 mg/l |
| 3 Dec 2025, 14:30 | 0.3 | 0.3 mg/l |
| 4 Nov 2025, 11:35 | 0.28 | 0.28 mg/l |
| 1 Oct 2025, 12:50 | 0.33 | 0.33 mg/l |
| 1 Sep 2025, 13:20 | 0.32 | 0.32 mg/l |
| 1 Aug 2025, 15:09 | 0.27 | 0.27 mg/l |
| 4 Jul 2025, 14:23 | 0.28 | 0.28 mg/l |
| 16 Jun 2025, 10:51 | 0.19 | 0.19 mg/l |
| 8 May 2025, 11:14 | 0.14 | 0.14 mg/l |
| 2 Apr 2025, 14:30 | 0.14 | 0.14 mg/l |
| 4 Mar 2025, 11:07 | 0.14 | 0.14 mg/l |
| 6 Feb 2025, 13:44 | 0.17 | 0.17 mg/l |
| 8 Jan 2025, 12:25 | 0.12 | 0.12 mg/l |
| 2 Dec 2024, 09:46 | 0.21 | 0.21 mg/l |
| 12 Nov 2024, 08:45 | 0.38 | 0.38 mg/l |
| 8 Oct 2024, 12:23 | 0.24 | 0.24 mg/l |
| 9 Sep 2024, 11:37 | 0.25 | 0.25 mg/l |
| 2 Aug 2024, 09:18 | 0.31 | 0.31 mg/l |
| 1 Jul 2024, 11:27 | 0.27 | 0.27 mg/l |
| 4 Jun 2024, 15:04 | 0.3 | 0.3 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
1011 µS/cm
Sampled 6 Aug 2026, 56 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 Aug 2026, 14:29 | 1011 | 1011 µS/cm |
| 7 Jul 2026, 13:25 | 997 | 997 µS/cm |
| 16 Jun 2026, 13:16 | 883 | 883 µS/cm |
| 19 May 2026, 13:30 | 925 | 925 µS/cm |
| 8 Apr 2026, 12:23 | 928 | 928 µS/cm |
| 2 Mar 2026, 10:07 | 881 | 881 µS/cm |
| 3 Feb 2026, 15:02 | 855 | 855 µS/cm |
| 9 Jan 2026, 13:07 | 969 | 969 µS/cm |
| 3 Dec 2025, 14:30 | 973 | 973 µS/cm |
| 4 Nov 2025, 11:35 | 1049 | 1049 µS/cm |
| 1 Oct 2025, 12:50 | 1081 | 1081 µS/cm |
| 1 Sep 2025, 13:20 | 972 | 972 µS/cm |
| 1 Aug 2025, 15:09 | 993 | 993 µS/cm |
| 4 Jul 2025, 14:23 | 994 | 994 µS/cm |
| 16 Jun 2025, 10:51 | 940 | 940 µS/cm |
| 8 May 2025, 11:14 | 949 | 949 µS/cm |
| 2 Apr 2025, 14:30 | 926 | 926 µS/cm |
| 4 Mar 2025, 11:07 | 885 | 885 µS/cm |
| 6 Feb 2025, 13:44 | 925 | 925 µS/cm |
| 8 Jan 2025, 12:25 | 841 | 841 µS/cm |
| 2 Dec 2024, 09:46 | 892 | 892 µS/cm |
| 12 Nov 2024, 08:45 | 936 | 936 µS/cm |
| 8 Oct 2024, 12:23 | 800 | 800 µS/cm |
| 9 Sep 2024, 11:37 | 860 | 860 µS/cm |
| 2 Aug 2024, 09:18 | 906 | 906 µS/cm |
| 1 Jul 2024, 11:27 | 914 | 914 µS/cm |
| 4 Jun 2024, 15:04 | 889 | 889 µS/cm |
Everything measured here
50 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 50 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 27 | Jun 2024 – Aug 2026 | 94.4% 6 Aug 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 27 | Jun 2024 – Aug 2026 | 8.75 mg/l 6 Aug 2026 |
| Temperature of Water 0076 | River water | 27 | Jun 2024 – Aug 2026 | 18.9 °C 6 Aug 2026 |
| pH 0061 | River water | 30 | Nov 2023 – Aug 2026 | 7.97 6 Aug 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 27 | Jun 2024 – Aug 2026 | below 0.03 mg/l 6 Aug 2026 |
| Nitrate as N 0117 | River water | 27 | Jun 2024 – Aug 2026 | 11 mg/l 6 Aug 2026 |
| Orthophosphate, reactive as P 0180 | River water | 27 | Jun 2024 – Aug 2026 | 0.2 mg/l 6 Aug 2026 |
| Conductivity at 25 C 0077 | River water | 27 | Jun 2024 – Aug 2026 | 1011 µS/cm 6 Aug 2026 |
| 1,1,1,2-Tetrachloroethane 6534 | River water | 24 | Apr 2024 – Aug 2026 | below 0.1 µg/l 6 Aug 2026 |
| 1,1,1-Trichloroethane 3268 | River water | 24 | Apr 2024 – Aug 2026 | below 0.1 µg/l 6 Aug 2026 |
| 1,1,2,2-Tetrachloroethane 7531 | River water | 24 | Apr 2024 – Aug 2026 | below 0.1 µg/l 6 Aug 2026 |
| 1,1,2-Trichloroethane 9811 | River water | 24 | Apr 2024 – Aug 2026 | below 0.1 µg/l 6 Aug 2026 |
| 1,1-Dichloroethane 3269 | River water | 24 | Apr 2024 – Aug 2026 | below 0.1 µg/l 6 Aug 2026 |
| 1,1-Dichloroethylene :- {1,1-Dichloroethene} 9836 | River water | 23 | Apr 2024 – Aug 2026 | below 0.1 µg/l 6 Aug 2026 |
| 1,2-Dichloroethane 3272 | River water | 24 | Apr 2024 – Aug 2026 | below 0.1 µg/l 6 Aug 2026 |
| 1,2-Dimethylbenzene :- {o-Xylene} 9845 | River water | 24 | Apr 2024 – Aug 2026 | below 0.1 µg/l 6 Aug 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 27 | Jun 2024 – Aug 2026 | 200 mg/l 6 Aug 2026 |
| Ammonia un-ionised as N 0119 | River water | 26 | Jul 2024 – Aug 2026 | below 0.00098 mg/l 6 Aug 2026 |
| Benzene 3781 | River water | 24 | Apr 2024 – Aug 2026 | below 0.1 µg/l 6 Aug 2026 |
| Bromodichloromethane 3282 | River water | 24 | Apr 2024 – Aug 2026 | below 0.1 µg/l 6 Aug 2026 |
| Bromoform :- {Tribromomethane} 3283 | River water | 24 | Apr 2024 – Aug 2026 | below 0.1 µg/l 6 Aug 2026 |
| Calcium, Dissolved 0239 | River water | 31 | Nov 2023 – Aug 2026 | 120 mg/l 6 Aug 2026 |
| Carbon tetrachloride :- {Tetrachloromethane} 1049 | River water | 24 | Apr 2024 – Aug 2026 | below 0.1 µg/l 6 Aug 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 31 | Nov 2023 – Aug 2026 | 4.2 mg/l 6 Aug 2026 |
| Chlorobenzene 3290 | River water | 24 | Apr 2024 – Aug 2026 | below 0.1 µg/l 6 Aug 2026 |
| Chlorodibromomethane 3292 | River water | 24 | Apr 2024 – Aug 2026 | below 0.1 µg/l 6 Aug 2026 |
| Chloroform :- {Trichloromethane} 3373 | River water | 24 | Apr 2024 – Aug 2026 | below 0.1 µg/l 6 Aug 2026 |
| Chromium 3164 | River water | 29 | Apr 2024 – Aug 2026 | 0.6 µg/l 6 Aug 2026 |
| Chromium Hexavalent, Dissolved :- {Cr VI} 6619 | River water | 29 | Apr 2024 – Aug 2026 | 0.15 µg/l 6 Aug 2026 |
| Chromium, Dissolved 3409 | River water | 29 | Apr 2024 – Aug 2026 | below 0.5 µg/l 6 Aug 2026 |
| cis-1,2-Dichloroethylene :- {cis-1,2-Dichloroethene} 6538 | River water | 23 | Apr 2024 – Aug 2026 | below 0.5 µg/l 6 Aug 2026 |
| Dimethylbenzene : Sum of isomers (1,3- 1,4-) 6716 | River water | 24 | Apr 2024 – Aug 2026 | below 0.2 µg/l 6 Aug 2026 |
| Ethyl tert-butyl ether :- {ETBE} 9844 | River water | 23 | Apr 2024 – Aug 2026 | below 0.1 µg/l 6 Aug 2026 |
| Ethylbenzene 4117 | River water | 24 | Apr 2024 – Aug 2026 | below 0.1 µg/l 6 Aug 2026 |
| Iron 6051 | River water | 6 | May 2025 – Aug 2026 | 200 µg/l 6 Aug 2026 |
| Iron, Dissolved 6460 | River water | 6 | May 2025 – Aug 2026 | below 30 µg/l 6 Aug 2026 |
| Magnesium, Dissolved 0235 | River water | 6 | May 2025 – Aug 2026 | 5.2 mg/l 6 Aug 2026 |
| MTBE :- {Methyl tert-butyl ether} 6656 | River water | 22 | Apr 2024 – Aug 2026 | below 0.1 µg/l 6 Aug 2026 |
| Nickel : BLM Bioavailable 3878 | River water | 2 | Nov 2023 – Feb 2024 | 2.1 µg/l 8 Feb 2024 |
| Nickel, Dissolved 3410 | River water | 2 | Nov 2023 – Feb 2024 | 4.1 µg/l 8 Feb 2024 |
| Nitrite as N 0118 | River water | 27 | Jun 2024 – Aug 2026 | 0.022 mg/l 6 Aug 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 27 | Jun 2024 – Aug 2026 | 11 mg/l 6 Aug 2026 |
| Styrene :- {Vinylbenzene} 9888 | River water | 24 | Apr 2024 – Aug 2026 | below 0.1 µg/l 6 Aug 2026 |
| tert-Amyl methyl ether :- {TAME} 9839 | River water | 23 | Apr 2024 – Aug 2026 | below 0.1 µg/l 6 Aug 2026 |
| Tetrachloroethylene :- {Perchloroethylene} 3328 | River water | 24 | Apr 2024 – Aug 2026 | below 0.1 µg/l 6 Aug 2026 |
| Toluene :- {Methylbenzene} 3784 | River water | 24 | Apr 2024 – Aug 2026 | below 0.1 µg/l 6 Aug 2026 |
| trans-1,2-Dichloroethylene :- {trans-1,2-Dichloroethene} 6539 | River water | 24 | Apr 2024 – Aug 2026 | below 0.1 µg/l 6 Aug 2026 |
| Trichloroethylene :- {Trichloroethene} 3334 | River water | 24 | Apr 2024 – Aug 2026 | below 0.1 µg/l 6 Aug 2026 |
| Trihalomethanes : Total :- {THM} 1200 | River water | 24 | Apr 2024 – Aug 2026 | below 0.4 µg/l 6 Aug 2026 |
| Vinyl chloride :- {Chloroethylene} 6715 | River water | 24 | Apr 2024 – Aug 2026 | below 0.1 µg/l 6 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.