Len 1/2 Mile downstream of Harrietsham SW
EA name: LEN 1/2 MILE DS HARRIETSHAM SW (also listed as “RIVER LEN HALF MILE DOWNSTREAM HARRIETSHAM SEWAGE WORKS”)
Environment Agency sampling point SO-E0000494 · 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, 10:1616 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 18 since 5 Oct 2023 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 586419, 152120As published, to the nearest 1 m. Open in a map
- River, by its own name
- Len 1 2 Mile
- River, by the map
- River LenPlaced on a river whose name partly matches its own, 11 m from the line.
- Next gauge downstream
- Maidstone On the River Medway · 15 km along the river
- Why it was sampled
- Environmental monitoring statutory (EU directives) (18 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
84.9%
Sampled 15 Sep 2026, 16 days ago · 16 results banked
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Sep 2026, 10:16 | 84.9 | 84.9% |
| 11 Aug 2026, 10:52 | 86.8 | 86.8% |
| 10 Jul 2026, 09:07 | 88.4 | 88.4% |
| 22 Jun 2026, 09:23 | 89.6 | 89.6% |
| 13 May 2026, 08:56 | 97.7 | 97.7% |
| 8 Apr 2026, 11:14 | 97.4 | 97.4% |
| 12 Mar 2025, 11:25 | 101.3 | 101.3% |
| 4 Feb 2025, 08:47 | 96.5 | 96.5% |
| 7 Jan 2025, 12:39 | 95.4 | 95.4% |
| 3 Dec 2024, 12:24 | 94.6 | 94.6% |
| 1 Nov 2024, 10:57 | 87.7 | 87.7% |
| 14 Oct 2024, 08:33 | 95.1 | 95.1% |
| 5 Sep 2024, 11:55 | 89.2 | 89.2% |
| 6 Aug 2024, 11:10 | 93.2 | 93.2% |
| 2 Jul 2024, 09:14 | 92.2 | 92.2% |
| 3 Jun 2024, 12:09 | 96.9 | 96.9% |
Dissolved oxygen
as O2 · code 9924 · mg/l
8.17 mg/l
Sampled 15 Sep 2026, 16 days ago · 16 results banked
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Sep 2026, 10:16 | 8.17 | 8.17 mg/l |
| 11 Aug 2026, 10:52 | 8.33 | 8.33 mg/l |
| 10 Jul 2026, 09:07 | 8.08 | 8.08 mg/l |
| 22 Jun 2026, 09:23 | 8.36 | 8.36 mg/l |
| 13 May 2026, 08:56 | 10.8 | 10.8 mg/l |
| 8 Apr 2026, 11:14 | 10.3 | 10.3 mg/l |
| 12 Mar 2025, 11:25 | 11.8 | 11.8 mg/l |
| 4 Feb 2025, 08:47 | 11.7 | 11.7 mg/l |
| 7 Jan 2025, 12:39 | 11.8 | 11.8 mg/l |
| 3 Dec 2024, 12:24 | 11.1 | 11.1 mg/l |
| 1 Nov 2024, 10:57 | 9.32 | 9.32 mg/l |
| 14 Oct 2024, 08:33 | 10.6 | 10.6 mg/l |
| 5 Sep 2024, 11:55 | 8.8 | 8.8 mg/l |
| 6 Aug 2024, 11:10 | 8.39 | 8.39 mg/l |
| 2 Jul 2024, 09:14 | 9.31 | 9.31 mg/l |
| 3 Jun 2024, 12:09 | 9.66 | 9.66 mg/l |
Water temperature
code 0076 · °C
17.1 °C
Sampled 15 Sep 2026, 16 days ago · 16 results banked
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Sep 2026, 10:16 | 17.1 | 17.1 °C |
| 11 Aug 2026, 10:52 | 17.2 | 17.2 °C |
| 10 Jul 2026, 09:07 | 19.6 | 19.6 °C |
| 22 Jun 2026, 09:23 | 18.6 | 18.6 °C |
| 13 May 2026, 08:56 | 10.9 | 10.9 °C |
| 8 Apr 2026, 11:14 | 12.6 | 12.6 °C |
| 12 Mar 2025, 11:25 | 8.5 | 8.5 °C |
| 4 Feb 2025, 08:47 | 6.9 | 6.9 °C |
| 7 Jan 2025, 12:39 | 6.2 | 6.2 °C |
| 3 Dec 2024, 12:24 | 8.5 | 8.5 °C |
| 1 Nov 2024, 10:57 | 12.5 | 12.5 °C |
| 14 Oct 2024, 08:33 | 10.5 | 10.5 °C |
| 5 Sep 2024, 11:55 | 15.9 | 15.9 °C |
| 6 Aug 2024, 11:10 | 20.4 | 20.4 °C |
| 2 Jul 2024, 09:14 | 14.8 | 14.8 °C |
| 3 Jun 2024, 12:09 | 15.4 | 15.4 °C |
pH
code 0061
8.05
Sampled 15 Sep 2026, 16 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Sep 2026, 10:16 | 8.05 | 8.05 |
| 11 Aug 2026, 10:52 | 8.08 | 8.08 |
| 10 Jul 2026, 09:07 | 8.02 | 8.02 |
| 22 Jun 2026, 09:23 | 8.06 | 8.06 |
| 13 May 2026, 08:56 | 8.16 | 8.16 |
| 8 Apr 2026, 11:14 | 8.17 | 8.17 |
| 12 Mar 2025, 11:25 | 8.22 | 8.22 |
| 4 Feb 2025, 08:47 | 8.07 | 8.07 |
| 7 Jan 2025, 12:39 | 8.03 | 8.03 |
| 3 Dec 2024, 12:24 | 8.07 | 8.07 |
| 1 Nov 2024, 10:57 | 7.87 | 7.87 |
| 14 Oct 2024, 08:33 | 7.92 | 7.92 |
| 5 Sep 2024, 11:55 | 8.02 | 8.02 |
| 6 Aug 2024, 11:10 | 7.88 | 7.88 |
| 2 Jul 2024, 09:14 | 8.09 | 8.09 |
| 3 Jun 2024, 12:09 | 8.18 | 8.18 |
| 5 Feb 2024, 11:25 | 8.19 | 8.19 |
| 5 Oct 2023, 10:19 | 8.06 | 8.06 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.066 mg/l
Sampled 15 Sep 2026, 16 days ago · 16 results banked
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Sep 2026, 10:16 | 0.066 | 0.066 mg/l |
| 11 Aug 2026, 10:52 | 0.16 | 0.16 mg/l |
| 10 Jul 2026, 09:07 | 0.13 | 0.13 mg/l |
| 22 Jun 2026, 09:23 | 0.06 | 0.06 mg/l |
| 13 May 2026, 08:56 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Apr 2026, 11:14 | 0.11 | 0.11 mg/l |
| 12 Mar 2025, 11:25 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Feb 2025, 08:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Jan 2025, 12:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Dec 2024, 12:24 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Nov 2024, 10:57 | 0.36 | 0.36 mg/l |
| 14 Oct 2024, 08:33 | 0.098 | 0.098 mg/l |
| 5 Sep 2024, 11:55 | 0.046 | 0.046 mg/l |
| 6 Aug 2024, 11:10 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Jul 2024, 09:14 | 0.09 | 0.09 mg/l |
| 3 Jun 2024, 12:09 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
8.41 mg/l
Sampled 15 Sep 2026, 16 days ago · 16 results banked
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Sep 2026, 10:16 | 8.41 | 8.41 mg/l |
| 11 Aug 2026, 10:52 | 8.69 | 8.69 mg/l |
| 10 Jul 2026, 09:07 | 6.91 | 6.91 mg/l |
| 22 Jun 2026, 09:23 | 7.54 | 7.54 mg/l |
| 13 May 2026, 08:56 | 5.48 | 5.48 mg/l |
| 8 Apr 2026, 11:14 | 8.4 | 8.4 mg/l |
| 12 Mar 2025, 11:25 | 7.98 | 7.98 mg/l |
| 4 Feb 2025, 08:47 | 7.78 | 7.78 mg/l |
| 7 Jan 2025, 12:39 | 5.78 | 5.78 mg/l |
| 3 Dec 2024, 12:24 | 6.88 | 6.88 mg/l |
| 1 Nov 2024, 10:57 | 7.29 | 7.29 mg/l |
| 14 Oct 2024, 08:33 | 5.94 | 5.94 mg/l |
| 5 Sep 2024, 11:55 | 6.77 | 6.77 mg/l |
| 6 Aug 2024, 11:10 | 5.37 | 5.37 mg/l |
| 2 Jul 2024, 09:14 | 6.36 | 6.36 mg/l |
| 3 Jun 2024, 12:09 | 7.16 | 7.16 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.11 mg/l
Sampled 15 Sep 2026, 16 days ago · 14 results banked
Every result (14)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Sep 2026, 10:16 | 0.11 | 0.11 mg/l |
| 10 Jul 2026, 09:07 | 0.065 | 0.065 mg/l |
| 22 Jun 2026, 09:23 | 0.11 | 0.11 mg/l |
| 13 May 2026, 08:56 | 0.024 | 0.024 mg/l |
| 8 Apr 2026, 11:14 | 0.032 | 0.032 mg/l |
| 12 Mar 2025, 11:25 | 0.035 | 0.035 mg/l |
| 4 Feb 2025, 08:47 | 0.067 | 0.067 mg/l |
| 7 Jan 2025, 12:39 | 0.081 | 0.081 mg/l |
| 1 Nov 2024, 10:57 | 0.074 | 0.074 mg/l |
| 14 Oct 2024, 08:33 | 0.072 | 0.072 mg/l |
| 5 Sep 2024, 11:55 | 0.09 | 0.09 mg/l |
| 6 Aug 2024, 11:10 | 0.012 | 0.012 mg/l |
| 2 Jul 2024, 09:14 | 0.079 | 0.079 mg/l |
| 3 Jun 2024, 12:09 | 0.048 | 0.048 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
766 µS/cm
Sampled 15 Sep 2026, 16 days ago · 16 results banked
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Sep 2026, 10:16 | 766 | 766 µS/cm |
| 11 Aug 2026, 10:52 | 777 | 777 µS/cm |
| 10 Jul 2026, 09:07 | 764 | 764 µS/cm |
| 22 Jun 2026, 09:23 | 786 | 786 µS/cm |
| 13 May 2026, 08:56 | 758 | 758 µS/cm |
| 8 Apr 2026, 11:14 | 772 | 772 µS/cm |
| 12 Mar 2025, 11:25 | 763 | 763 µS/cm |
| 4 Feb 2025, 08:47 | 758 | 758 µS/cm |
| 7 Jan 2025, 12:39 | 687 | 687 µS/cm |
| 3 Dec 2024, 12:24 | 755 | 755 µS/cm |
| 1 Nov 2024, 10:57 | 770 | 770 µS/cm |
| 14 Oct 2024, 08:33 | 595 | 595 µS/cm |
| 5 Sep 2024, 11:55 | 742 | 742 µS/cm |
| 6 Aug 2024, 11:10 | 586 | 586 µS/cm |
| 2 Jul 2024, 09:14 | 786 | 786 µS/cm |
| 3 Jun 2024, 12:09 | 759 | 759 µS/cm |
Everything measured here
18 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 18 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 16 | Jun 2024 – Sep 2026 | 84.9% 15 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 16 | Jun 2024 – Sep 2026 | 8.17 mg/l 15 Sep 2026 |
| Temperature of Water 0076 | River water | 16 | Jun 2024 – Sep 2026 | 17.1 °C 15 Sep 2026 |
| pH 0061 | River water | 18 | Oct 2023 – Sep 2026 | 8.05 15 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 16 | Jun 2024 – Sep 2026 | 0.066 mg/l 15 Sep 2026 |
| Nitrate as N 0117 | River water | 16 | Jun 2024 – Sep 2026 | 8.41 mg/l 15 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 14 | Jun 2024 – Sep 2026 | 0.11 mg/l 15 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 16 | Jun 2024 – Sep 2026 | 766 µS/cm 15 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 16 | Jun 2024 – Sep 2026 | 240 mg/l 15 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 16 | Jun 2024 – Sep 2026 | 0.00202 mg/l 15 Sep 2026 |
| Calcium, Dissolved 0239 | River water | 2 | Oct 2023 – Feb 2024 | 130 mg/l 5 Feb 2024 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 2 | Oct 2023 – Feb 2024 | 2 mg/l 5 Feb 2024 |
| Lead : BLM Bioavailable 3377 | River water | 2 | Oct 2023 – Feb 2024 | 0.03 µg/l 5 Feb 2024 |
| Lead, Dissolved 0052 | River water | 2 | Oct 2023 – Feb 2024 | below 0.1 µg/l 5 Feb 2024 |
| Nickel : BLM Bioavailable 3878 | River water | 2 | Oct 2023 – Feb 2024 | 0.95 µg/l 5 Feb 2024 |
| Nickel, Dissolved 3410 | River water | 2 | Oct 2023 – Feb 2024 | 1.3 µg/l 5 Feb 2024 |
| Nitrite as N 0118 | River water | 16 | Jun 2024 – Sep 2026 | 0.094 mg/l 15 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 16 | Jun 2024 – Sep 2026 | 8.5 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.