River Len downstream of Leeds Stream Con
EA name: R LEN D/S LEEDS STREAM CON (also listed as “RIVER LEN DOWNSTREAM LEEDS STREAM”)
Environment Agency sampling point SO-E0000490 · 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
- 15 Sep 2026, 10:4816 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 28 since 13 Jun 2024 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Environmental monitoring statutory (EU directives)
- Where
- National Grid 581000, 154000As published, to the nearest 100 m (so up to about 70 m out). Open in a map
- River, by its own name
- Len
- River, by the map
- River LenPlaced on the river its name gives, 13 m from the line.
- Next gauge downstream
- Maidstone On the River Medway · 7.0 km along the river
- Why it was sampled
- Environmental monitoring statutory (EU directives) (28 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
92.7%
Sampled 15 Sep 2026, 16 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Sep 2026, 10:48 | 92.7 | 92.7% |
| 10 Aug 2026, 12:20 | 94.2 | 94.2% |
| 2 Jul 2026, 11:29 | 93.2 | 93.2% |
| 18 Jun 2026, 08:30 | 89.9 | 89.9% |
| 11 May 2026, 09:14 | 96.4 | 96.4% |
| 9 Apr 2026, 08:38 | 96.6 | 96.6% |
| 4 Mar 2026, 10:39 | 100.1 | 100.1% |
| 5 Feb 2026, 13:01 | 99 | 99% |
| 7 Jan 2026, 11:10 | 98.8 | 98.8% |
| 5 Dec 2025, 09:52 | 96.7 | 96.7% |
| 11 Nov 2025, 14:29 | 91.8 | 91.8% |
| 7 Oct 2025, 09:20 | 90.9 | 90.9% |
| 2 Sep 2025, 09:16 | 89.7 | 89.7% |
| 5 Aug 2025, 13:51 | 95.4 | 95.4% |
| 9 Jul 2025, 08:56 | 88.8 | 88.8% |
| 17 Jun 2025, 11:14 | 96.3 | 96.3% |
| 22 May 2025, 14:09 | 94.6 | 94.6% |
| 11 Apr 2025, 09:16 | 100 | 100% |
| 5 Mar 2025, 08:57 | 101.2 | 101.2% |
| 4 Feb 2025, 13:23 | 101.4 | 101.4% |
| 7 Jan 2025, 11:31 | 99 | 99% |
| 3 Dec 2024, 13:26 | 97.1 | 97.1% |
| 5 Nov 2024, 12:31 | 95.5 | 95.5% |
| 14 Oct 2024, 08:13 | 101.5 | 101.5% |
| 3 Sep 2024, 12:44 | 99.7 | 99.7% |
| 6 Aug 2024, 11:47 | 99.6 | 99.6% |
| 11 Jul 2024, 10:03 | 95 | 95% |
| 13 Jun 2024, 07:18 | 94.7 | 94.7% |
Dissolved oxygen
as O2 · code 9924 · mg/l
8.79 mg/l
Sampled 15 Sep 2026, 16 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Sep 2026, 10:48 | 8.79 | 8.79 mg/l |
| 10 Aug 2026, 12:20 | 8.79 | 8.79 mg/l |
| 2 Jul 2026, 11:29 | 8.68 | 8.68 mg/l |
| 18 Jun 2026, 08:30 | 8.51 | 8.51 mg/l |
| 11 May 2026, 09:14 | 10.6 | 10.6 mg/l |
| 9 Apr 2026, 08:38 | 10.4 | 10.4 mg/l |
| 4 Mar 2026, 10:39 | 11.4 | 11.4 mg/l |
| 5 Feb 2026, 13:01 | 11.9 | 11.9 mg/l |
| 7 Jan 2026, 11:10 | 13.4 | 13.4 mg/l |
| 5 Dec 2025, 09:52 | 12 | 12 mg/l |
| 11 Nov 2025, 14:29 | 10.1 | 10.1 mg/l |
| 7 Oct 2025, 09:20 | 9.69 | 9.69 mg/l |
| 2 Sep 2025, 09:16 | 9 | 9 mg/l |
| 5 Aug 2025, 13:51 | 9.18 | 9.18 mg/l |
| 9 Jul 2025, 08:56 | 8.76 | 8.76 mg/l |
| 17 Jun 2025, 11:14 | 9.32 | 9.32 mg/l |
| 22 May 2025, 14:09 | 10.1 | 10.1 mg/l |
| 11 Apr 2025, 09:16 | 11.7 | 11.7 mg/l |
| 5 Mar 2025, 08:57 | 13.1 | 13.1 mg/l |
| 4 Feb 2025, 13:23 | 12.3 | 12.3 mg/l |
| 7 Jan 2025, 11:31 | 12.5 | 12.5 mg/l |
| 3 Dec 2024, 13:26 | 11.4 | 11.4 mg/l |
| 5 Nov 2024, 12:31 | 10.4 | 10.4 mg/l |
| 14 Oct 2024, 08:13 | 11.5 | 11.5 mg/l |
| 3 Sep 2024, 12:44 | 9.32 | 9.32 mg/l |
| 6 Aug 2024, 11:47 | 9.11 | 9.11 mg/l |
| 11 Jul 2024, 10:03 | 9.43 | 9.43 mg/l |
| 13 Jun 2024, 07:18 | 10.2 | 10.2 mg/l |
Water temperature
code 0076 · °C
17.8 °C
Sampled 15 Sep 2026, 16 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Sep 2026, 10:48 | 17.8 | 17.8 °C |
| 10 Aug 2026, 12:20 | 18.6 | 18.6 °C |
| 2 Jul 2026, 11:29 | 18.7 | 18.7 °C |
| 18 Jun 2026, 08:30 | 17.9 | 17.9 °C |
| 11 May 2026, 09:14 | 11 | 11 °C |
| 9 Apr 2026, 08:38 | 12.1 | 12.1 °C |
| 4 Mar 2026, 10:39 | 9.6 | 9.6 °C |
| 5 Feb 2026, 13:01 | 7.5 | 7.5 °C |
| 7 Jan 2026, 11:10 | 2.8 | 2.8 °C |
| 5 Dec 2025, 09:52 | 6.2 | 6.2 °C |
| 11 Nov 2025, 14:29 | 10.9 | 10.9 °C |
| 7 Oct 2025, 09:20 | 12.4 | 12.4 °C |
| 2 Sep 2025, 09:16 | 15.1 | 15.1 °C |
| 5 Aug 2025, 13:51 | 17.1 | 17.1 °C |
| 9 Jul 2025, 08:56 | 15.9 | 15.9 °C |
| 17 Jun 2025, 11:14 | 16.8 | 16.8 °C |
| 22 May 2025, 14:09 | 12.2 | 12.2 °C |
| 11 Apr 2025, 09:16 | 8.6 | 8.6 °C |
| 5 Mar 2025, 08:57 | 4.3 | 4.3 °C |
| 4 Feb 2025, 13:23 | 6.9 | 6.9 °C |
| 7 Jan 2025, 11:31 | 5.4 | 5.4 °C |
| 3 Dec 2024, 13:26 | 8.2 | 8.2 °C |
| 5 Nov 2024, 12:31 | 11.4 | 11.4 °C |
| 14 Oct 2024, 08:13 | 9.8 | 9.8 °C |
| 3 Sep 2024, 12:44 | 18.5 | 18.5 °C |
| 6 Aug 2024, 11:47 | 19.6 | 19.6 °C |
| 11 Jul 2024, 10:03 | 15.6 | 15.6 °C |
| 13 Jun 2024, 07:18 | 12 | 12 °C |
pH
code 0061
8.08
Sampled 15 Sep 2026, 16 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Sep 2026, 10:48 | 8.08 | 8.08 |
| 10 Aug 2026, 12:20 | 8.11 | 8.11 |
| 2 Jul 2026, 11:29 | 8.06 | 8.06 |
| 18 Jun 2026, 08:30 | 7.97 | 7.97 |
| 11 May 2026, 09:14 | 8.13 | 8.13 |
| 9 Apr 2026, 08:38 | 8.11 | 8.11 |
| 4 Mar 2026, 10:39 | 8.33 | 8.33 |
| 5 Feb 2026, 13:01 | 8.18 | 8.18 |
| 7 Jan 2026, 11:10 | 8.02 | 8.02 |
| 5 Dec 2025, 09:52 | 7.86 | 7.86 |
| 11 Nov 2025, 14:29 | 8.08 | 8.08 |
| 7 Oct 2025, 09:20 | 8.1 | 8.1 |
| 2 Sep 2025, 09:16 | 8.05 | 8.05 |
| 5 Aug 2025, 13:51 | 8.37 | 8.37 |
| 9 Jul 2025, 08:56 | 8.08 | 8.08 |
| 17 Jun 2025, 11:14 | 8.14 | 8.14 |
| 22 May 2025, 14:09 | 8.19 | 8.19 |
| 11 Apr 2025, 09:16 | 8.25 | 8.25 |
| 5 Mar 2025, 08:57 | 8.38 | 8.38 |
| 4 Feb 2025, 13:23 | 8.31 | 8.31 |
| 7 Jan 2025, 11:31 | 8.19 | 8.19 |
| 3 Dec 2024, 13:26 | 8.18 | 8.18 |
| 5 Nov 2024, 12:31 | 8.1 | 8.1 |
| 14 Oct 2024, 08:13 | 8.07 | 8.07 |
| 3 Sep 2024, 12:44 | 8.06 | 8.06 |
| 6 Aug 2024, 11:47 | 8.19 | 8.19 |
| 11 Jul 2024, 10:03 | 8.22 | 8.22 |
| 13 Jun 2024, 07:18 | 8.08 | 8.08 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 15 Sep 2026, 16 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Sep 2026, 10:48 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Aug 2026, 12:20 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Jul 2026, 11:29 | 0.039 | 0.039 mg/l |
| 18 Jun 2026, 08:30 | 0.031 | 0.031 mg/l |
| 11 May 2026, 09:14 | 0.11 | 0.11 mg/l |
| 9 Apr 2026, 08:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Mar 2026, 10:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Feb 2026, 13:01 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Jan 2026, 11:10 | 0.24 | 0.24 mg/l |
| 5 Dec 2025, 09:52 | 0.03 | 0.03 mg/l |
| 11 Nov 2025, 14:29 | 0.063 | 0.063 mg/l |
| 7 Oct 2025, 09:20 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Sep 2025, 09:16 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Aug 2025, 13:51 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Jul 2025, 08:56 | 0.064 | 0.064 mg/l |
| 17 Jun 2025, 11:14 | 0.031 | 0.031 mg/l |
| 22 May 2025, 14:09 | 0.036 | 0.036 mg/l |
| 11 Apr 2025, 09:16 | 0.032 | 0.032 mg/l |
| 5 Mar 2025, 08:57 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Feb 2025, 13:23 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Jan 2025, 11:31 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Dec 2024, 13:26 | 0.037 | 0.037 mg/l |
| 5 Nov 2024, 12:31 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Oct 2024, 08:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Sep 2024, 12:44 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Aug 2024, 11:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Jul 2024, 10:03 | 0.03 | 0.03 mg/l |
| 13 Jun 2024, 07:18 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
6.68 mg/l
Sampled 15 Sep 2026, 16 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Sep 2026, 10:48 | 6.68 | 6.68 mg/l |
| 10 Aug 2026, 12:20 | 7.07 | 7.07 mg/l |
| 2 Jul 2026, 11:29 | 6.56 | 6.56 mg/l |
| 18 Jun 2026, 08:30 | 7.15 | 7.15 mg/l |
| 11 May 2026, 09:14 | 7.66 | 7.66 mg/l |
| 9 Apr 2026, 08:38 | 8.18 | 8.18 mg/l |
| 4 Mar 2026, 10:39 | 7.78 | 7.78 mg/l |
| 5 Feb 2026, 13:01 | 5.98 | 5.98 mg/l |
| 7 Jan 2026, 11:10 | 7.65 | 7.65 mg/l |
| 5 Dec 2025, 09:52 | 7.77 | 7.77 mg/l |
| 11 Nov 2025, 14:29 | 6.45 | 6.45 mg/l |
| 7 Oct 2025, 09:20 | 7.47 | 7.47 mg/l |
| 2 Sep 2025, 09:16 | 8.08 | 8.08 mg/l |
| 5 Aug 2025, 13:51 | 5.77 | 5.77 mg/l |
| 9 Jul 2025, 08:56 | 6.43 | 6.43 mg/l |
| 17 Jun 2025, 11:14 | 6.76 | 6.76 mg/l |
| 22 May 2025, 14:09 | 6.56 | 6.56 mg/l |
| 11 Apr 2025, 09:16 | 9.48 | 9.48 mg/l |
| 5 Mar 2025, 08:57 | 7.89 | 7.89 mg/l |
| 4 Feb 2025, 13:23 | 7.49 | 7.49 mg/l |
| 7 Jan 2025, 11:31 | 5.99 | 5.99 mg/l |
| 5 Nov 2024, 12:31 | 6.77 | 6.77 mg/l |
| 14 Oct 2024, 08:13 | 7.28 | 7.28 mg/l |
| 3 Sep 2024, 12:44 | 6.78 | 6.78 mg/l |
| 6 Aug 2024, 11:47 | 6.18 | 6.18 mg/l |
| 11 Jul 2024, 10:03 | 6.46 | 6.46 mg/l |
| 13 Jun 2024, 07:18 | 7.57 | 7.57 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.092 mg/l
Sampled 15 Sep 2026, 16 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Sep 2026, 10:48 | 0.092 | 0.092 mg/l |
| 10 Aug 2026, 12:20 | 0.11 | 0.11 mg/l |
| 2 Jul 2026, 11:29 | 0.098 | 0.098 mg/l |
| 18 Jun 2026, 08:30 | 0.057 | 0.057 mg/l |
| 11 May 2026, 09:14 | 0.061 | 0.061 mg/l |
| 9 Apr 2026, 08:38 | 0.075 | 0.075 mg/l |
| 4 Mar 2026, 10:39 | 0.049 | 0.049 mg/l |
| 5 Feb 2026, 13:01 | 0.078 | 0.078 mg/l |
| 7 Jan 2026, 11:10 | 0.08 | 0.08 mg/l |
| 5 Dec 2025, 09:52 | 0.085 | 0.085 mg/l |
| 11 Nov 2025, 14:29 | 0.12 | 0.12 mg/l |
| 7 Oct 2025, 09:20 | 0.067 | 0.067 mg/l |
| 2 Sep 2025, 09:16 | 0.092 | 0.092 mg/l |
| 5 Aug 2025, 13:51 | 0.11 | 0.11 mg/l |
| 9 Jul 2025, 08:56 | 0.12 | 0.12 mg/l |
| 17 Jun 2025, 11:14 | 0.052 | 0.052 mg/l |
| 22 May 2025, 14:09 | 0.044 | 0.044 mg/l |
| 11 Apr 2025, 09:16 | 0.046 | 0.046 mg/l |
| 5 Mar 2025, 08:57 | 0.029 | 0.029 mg/l |
| 4 Feb 2025, 13:23 | 0.059 | 0.059 mg/l |
| 7 Jan 2025, 11:31 | 0.1 | 0.1 mg/l |
| 3 Dec 2024, 13:26 | 0.071 | 0.071 mg/l |
| 5 Nov 2024, 12:31 | 0.069 | 0.069 mg/l |
| 14 Oct 2024, 08:13 | 0.081 | 0.081 mg/l |
| 3 Sep 2024, 12:44 | 0.077 | 0.077 mg/l |
| 6 Aug 2024, 11:47 | 0.12 | 0.12 mg/l |
| 11 Jul 2024, 10:03 | 0.069 | 0.069 mg/l |
| 13 Jun 2024, 07:18 | 0.036 | 0.036 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
610 µS/cm
Sampled 15 Sep 2026, 16 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Sep 2026, 10:48 | 610 | 610 µS/cm |
| 10 Aug 2026, 12:20 | 611 | 611 µS/cm |
| 2 Jul 2026, 11:29 | 615 | 615 µS/cm |
| 18 Jun 2026, 08:30 | 618 | 618 µS/cm |
| 11 May 2026, 09:14 | 643 | 643 µS/cm |
| 9 Apr 2026, 08:38 | 659 | 659 µS/cm |
| 4 Mar 2026, 10:39 | 666 | 666 µS/cm |
| 5 Feb 2026, 13:01 | 603 | 603 µS/cm |
| 7 Jan 2026, 11:10 | 926 | 926 µS/cm |
| 5 Dec 2025, 09:52 | 703 | 703 µS/cm |
| 11 Nov 2025, 14:29 | 652 | 652 µS/cm |
| 7 Oct 2025, 09:20 | 657 | 657 µS/cm |
| 2 Sep 2025, 09:16 | 652 | 652 µS/cm |
| 5 Aug 2025, 13:51 | 626 | 626 µS/cm |
| 9 Jul 2025, 08:56 | 635 | 635 µS/cm |
| 17 Jun 2025, 11:14 | 592 | 592 µS/cm |
| 22 May 2025, 14:09 | 576 | 576 µS/cm |
| 11 Apr 2025, 09:16 | 659 | 659 µS/cm |
| 5 Mar 2025, 08:57 | 668 | 668 µS/cm |
| 4 Feb 2025, 13:23 | 675 | 675 µS/cm |
| 7 Jan 2025, 11:31 | 609 | 609 µS/cm |
| 3 Dec 2024, 13:26 | 671 | 671 µS/cm |
| 5 Nov 2024, 12:31 | 680 | 680 µS/cm |
| 14 Oct 2024, 08:13 | 607 | 607 µS/cm |
| 3 Sep 2024, 12:44 | 622 | 622 µS/cm |
| 6 Aug 2024, 11:47 | 613 | 613 µS/cm |
| 11 Jul 2024, 10:03 | 629 | 629 µS/cm |
| 13 Jun 2024, 07:18 | 621 | 621 µS/cm |
Everything measured here
12 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 12 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 28 | Jun 2024 – Sep 2026 | 92.7% 15 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 28 | Jun 2024 – Sep 2026 | 8.79 mg/l 15 Sep 2026 |
| Temperature of Water 0076 | River water | 28 | Jun 2024 – Sep 2026 | 17.8 °C 15 Sep 2026 |
| pH 0061 | River water | 28 | Jun 2024 – Sep 2026 | 8.08 15 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 28 | Jun 2024 – Sep 2026 | below 0.03 mg/l 15 Sep 2026 |
| Nitrate as N 0117 | River water | 27 | Jun 2024 – Sep 2026 | 6.68 mg/l 15 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 28 | Jun 2024 – Sep 2026 | 0.092 mg/l 15 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 28 | Jun 2024 – Sep 2026 | 610 µS/cm 15 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 28 | Jun 2024 – Sep 2026 | 200 mg/l 15 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 28 | Jun 2024 – Sep 2026 | below 0.00097 mg/l 15 Sep 2026 |
| Nitrite as N 0118 | River water | 28 | Jun 2024 – Sep 2026 | 0.019 mg/l 15 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 27 | Jun 2024 – Sep 2026 | 6.7 mg/l 15 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.