Upstream of Lenham sewage treatment works
EA name: U/S LENHAM STW (also listed as “UPSTREAM LENHAM STW”)
Environment Agency sampling point SO-E0007347 · 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
- 13 Apr 2026, 09:026 months ago · time as the Environment Agency records it (UK clock time; the source gives no time zone). Not sampled since, as far as the archive shows: the Environment Agency was asked up to 30 Sep 2026 and had nothing newer.
- Samples banked
- 25 since 20 May 2024 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 590480, 150950As published, to the nearest 10 m. Open in a map
- River, by its own name
- Its name does not give one
- River, by the map
- Great StourPlaced by position alone (the only river line close by), 1 m from the line.
- Next gauge downstream
- Brown Mill On the Great Stour · 12 km along the river
- Why it was sampled
- Monitoring (national agency policy) (25 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
98.7%
Sampled 13 Apr 2026, 6 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Apr 2026, 09:02 | 98.7 | 98.7% |
| 9 Mar 2026, 12:35 | 97.5 | 97.5% |
| 11 Feb 2026, 10:46 | 95.7 | 95.7% |
| 7 Jan 2026, 10:22 | 96.6 | 96.6% |
| 3 Dec 2025, 10:35 | 92.5 | 92.5% |
| 6 Nov 2025, 09:21 | 90.9 | 90.9% |
| 14 Oct 2025, 10:42 | 92.5 | 92.5% |
| 3 Sep 2025, 11:08 | 90 | 90% |
| 13 Aug 2025, 11:05 | 98.7 | 98.7% |
| 3 Jul 2025, 13:13 | 103 | 103% |
| 3 Jun 2025, 11:38 | 96.5 | 96.5% |
| 13 May 2025, 09:31 | 98.8 | 98.8% |
| 22 Apr 2025, 12:22 | 99.7 | 99.7% |
| 6 Mar 2025, 10:35 | 99.8 | 99.8% |
| 4 Feb 2025, 08:00 | 97.8 | 97.8% |
| 21 Jan 2025, 11:11 | 99.3 | 99.3% |
| 3 Dec 2024, 10:18 | 96.2 | 96.2% |
| 18 Nov 2024, 08:27 | 92.9 | 92.9% |
| 14 Oct 2024, 09:41 | 99.8 | 99.8% |
| 16 Sep 2024, 13:36 | 96.5 | 96.5% |
| 21 Aug 2024, 10:43 | 97 | 97% |
| 15 Jul 2024, 08:13 | 96.4 | 96.4% |
| 26 Jun 2024, 09:45 | 96.5 | 96.5% |
| 19 Jun 2024, 11:03 | 96.1 | 96.1% |
| 20 May 2024, 10:20 | 95.4 | 95.4% |
Dissolved oxygen
as O2 · code 9924 · mg/l
11.3 mg/l
Sampled 13 Apr 2026, 6 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Apr 2026, 09:02 | 11.3 | 11.3 mg/l |
| 9 Mar 2026, 12:35 | 10.8 | 10.8 mg/l |
| 11 Feb 2026, 10:46 | 10.9 | 10.9 mg/l |
| 7 Jan 2026, 10:22 | 12.6 | 12.6 mg/l |
| 3 Dec 2025, 10:35 | 11.1 | 11.1 mg/l |
| 6 Nov 2025, 09:21 | 9.69 | 9.69 mg/l |
| 14 Oct 2025, 10:42 | 9.95 | 9.95 mg/l |
| 3 Sep 2025, 11:08 | 8.92 | 8.92 mg/l |
| 13 Aug 2025, 11:05 | 9.8 | 9.8 mg/l |
| 3 Jul 2025, 13:13 | 9.73 | 9.73 mg/l |
| 3 Jun 2025, 11:38 | 10.3 | 10.3 mg/l |
| 13 May 2025, 09:31 | 10.4 | 10.4 mg/l |
| 22 Apr 2025, 12:22 | 10.8 | 10.8 mg/l |
| 6 Mar 2025, 10:35 | 11.6 | 11.6 mg/l |
| 4 Feb 2025, 08:00 | 11.6 | 11.6 mg/l |
| 21 Jan 2025, 11:11 | 12.1 | 12.1 mg/l |
| 3 Dec 2024, 10:18 | 11.3 | 11.3 mg/l |
| 18 Nov 2024, 08:27 | 10.6 | 10.6 mg/l |
| 14 Oct 2024, 09:41 | 11 | 11 mg/l |
| 16 Sep 2024, 13:36 | 9.79 | 9.79 mg/l |
| 21 Aug 2024, 10:43 | 10.2 | 10.2 mg/l |
| 15 Jul 2024, 08:13 | 10.2 | 10.2 mg/l |
| 26 Jun 2024, 09:45 | 9.6 | 9.6 mg/l |
| 19 Jun 2024, 11:03 | 10 | 10 mg/l |
| 20 May 2024, 10:20 | 10.1 | 10.1 mg/l |
Water temperature
code 0076 · °C
9.4 °C
Sampled 13 Apr 2026, 6 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Apr 2026, 09:02 | 9.4 | 9.4 °C |
| 9 Mar 2026, 12:35 | 10.8 | 10.8 °C |
| 11 Feb 2026, 10:46 | 9.6 | 9.6 °C |
| 7 Jan 2026, 10:22 | 4.2 | 4.2 °C |
| 3 Dec 2025, 10:35 | 7.4 | 7.4 °C |
| 6 Nov 2025, 09:21 | 12.4 | 12.4 °C |
| 14 Oct 2025, 10:42 | 12 | 12 °C |
| 3 Sep 2025, 11:08 | 15.7 | 15.7 °C |
| 13 Aug 2025, 11:05 | 15.6 | 15.6 °C |
| 3 Jul 2025, 13:13 | 18 | 18 °C |
| 3 Jun 2025, 11:38 | 12.4 | 12.4 °C |
| 13 May 2025, 09:31 | 13 | 13 °C |
| 22 Apr 2025, 12:22 | 11.8 | 11.8 °C |
| 6 Mar 2025, 10:35 | 8.6 | 8.6 °C |
| 4 Feb 2025, 08:00 | 7.8 | 7.8 °C |
| 21 Jan 2025, 11:11 | 6.9 | 6.9 °C |
| 3 Dec 2024, 10:18 | 8.4 | 8.4 °C |
| 18 Nov 2024, 08:27 | 9.3 | 9.3 °C |
| 14 Oct 2024, 09:41 | 10.8 | 10.8 °C |
| 16 Sep 2024, 13:36 | 14.6 | 14.6 °C |
| 21 Aug 2024, 10:43 | 13.2 | 13.2 °C |
| 15 Jul 2024, 08:13 | 12.9 | 12.9 °C |
| 26 Jun 2024, 09:45 | 15.5 | 15.5 °C |
| 19 Jun 2024, 11:03 | 13.3 | 13.3 °C |
| 20 May 2024, 10:20 | 12.9 | 12.9 °C |
pH
code 0061
8.2
Sampled 13 Apr 2026, 6 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Apr 2026, 09:02 | 8.2 | 8.2 |
| 9 Mar 2026, 12:35 | 8.24 | 8.24 |
| 11 Feb 2026, 10:46 | 7.98 | 7.98 |
| 7 Jan 2026, 10:22 | 7.86 | 7.86 |
| 3 Dec 2025, 10:35 | 8.17 | 8.17 |
| 6 Nov 2025, 09:21 | 8.19 | 8.19 |
| 14 Oct 2025, 10:42 | 8.28 | 8.28 |
| 3 Sep 2025, 11:08 | 8.08 | 8.08 |
| 13 Aug 2025, 11:05 | 8.58 | 8.58 |
| 3 Jul 2025, 13:13 | 8.37 | 8.37 |
| 3 Jun 2025, 11:38 | 8.3 | 8.3 |
| 13 May 2025, 09:31 | 8.28 | 8.28 |
| 22 Apr 2025, 12:22 | 8.18 | 8.18 |
| 6 Mar 2025, 10:35 | 8.25 | 8.25 |
| 4 Feb 2025, 08:00 | 8.16 | 8.16 |
| 21 Jan 2025, 11:11 | 8.24 | 8.24 |
| 3 Dec 2024, 10:18 | 8.13 | 8.13 |
| 18 Nov 2024, 08:27 | 8.06 | 8.06 |
| 14 Oct 2024, 09:41 | 7.95 | 7.95 |
| 16 Sep 2024, 13:36 | 8.2 | 8.2 |
| 21 Aug 2024, 10:43 | 8.14 | 8.14 |
| 15 Jul 2024, 08:13 | 8.22 | 8.22 |
| 26 Jun 2024, 09:45 | 8.14 | 8.14 |
| 19 Jun 2024, 11:03 | 8.19 | 8.19 |
| 20 May 2024, 10:20 | 8.33 | 8.33 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 13 Apr 2026, 6 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Apr 2026, 09:02 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Mar 2026, 12:35 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Feb 2026, 10:46 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Jan 2026, 10:22 | 0.41 | 0.41 mg/l |
| 3 Dec 2025, 10:35 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Nov 2025, 09:21 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Oct 2025, 10:42 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Sep 2025, 11:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Aug 2025, 11:05 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Jul 2025, 13:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Jun 2025, 11:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 May 2025, 09:31 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Apr 2025, 12:22 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Mar 2025, 10:35 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Feb 2025, 08:00 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Jan 2025, 11:11 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Dec 2024, 10:18 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Nov 2024, 08:27 | 0.044 | 0.044 mg/l |
| 14 Oct 2024, 09:41 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Sep 2024, 13:36 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Aug 2024, 10:43 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Jul 2024, 08:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 26 Jun 2024, 09:45 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Jun 2024, 11:03 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 May 2024, 10:20 | 0.043 | 0.043 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
7.79 mg/l
Sampled 13 Apr 2026, 6 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Apr 2026, 09:02 | 7.79 | 7.79 mg/l |
| 9 Mar 2026, 12:35 | 7.69 | 7.69 mg/l |
| 11 Feb 2026, 10:46 | 6.49 | 6.49 mg/l |
| 7 Jan 2026, 10:22 | 5.38 | 5.38 mg/l |
| 3 Dec 2025, 10:35 | 6.09 | 6.09 mg/l |
| 6 Nov 2025, 09:21 | 5.79 | 5.79 mg/l |
| 14 Oct 2025, 10:42 | 7 | 7 mg/l |
| 3 Sep 2025, 11:08 | 4.3 | 4.3 mg/l |
| 13 Aug 2025, 11:05 | 7.6 | 7.6 mg/l |
| 3 Jul 2025, 13:13 | 7.19 | 7.19 mg/l |
| 3 Jun 2025, 11:38 | 7.39 | 7.39 mg/l |
| 13 May 2025, 09:31 | 7.79 | 7.79 mg/l |
| 22 Apr 2025, 12:22 | 8.08 | 8.08 mg/l |
| 6 Mar 2025, 10:35 | 8.29 | 8.29 mg/l |
| 4 Feb 2025, 08:00 | 7.99 | 7.99 mg/l |
| 21 Jan 2025, 11:11 | 7.98 | 7.98 mg/l |
| 3 Dec 2024, 10:18 | 7.19 | 7.19 mg/l |
| 18 Nov 2024, 08:27 | 6.39 | 6.39 mg/l |
| 14 Oct 2024, 09:41 | 4.29 | 4.29 mg/l |
| 16 Sep 2024, 13:36 | 6.59 | 6.59 mg/l |
| 21 Aug 2024, 10:43 | 6.69 | 6.69 mg/l |
| 15 Jul 2024, 08:13 | 7.09 | 7.09 mg/l |
| 26 Jun 2024, 09:45 | 7.58 | 7.58 mg/l |
| 19 Jun 2024, 11:03 | 7.68 | 7.68 mg/l |
| 20 May 2024, 10:20 | 7.88 | 7.88 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.037 mg/l
Sampled 13 Apr 2026, 6 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Apr 2026, 09:02 | 0.037 | 0.037 mg/l |
| 9 Mar 2026, 12:35 | 0.032 | 0.032 mg/l |
| 11 Feb 2026, 10:46 | 0.045 | 0.045 mg/l |
| 7 Jan 2026, 10:22 | 0.071 | 0.071 mg/l |
| 3 Dec 2025, 10:35 | 0.051 | 0.051 mg/l |
| 6 Nov 2025, 09:21 | 0.041 | 0.041 mg/l |
| 14 Oct 2025, 10:42 | 0.043 | 0.043 mg/l |
| 3 Sep 2025, 11:08 | 0.076 | 0.076 mg/l |
| 13 Aug 2025, 11:05 | 0.051 | 0.051 mg/l |
| 3 Jul 2025, 13:13 | 0.068 | 0.068 mg/l |
| 3 Jun 2025, 11:38 | 0.041 | 0.041 mg/l |
| 13 May 2025, 09:31 | 0.026 | 0.026 mg/l |
| 22 Apr 2025, 12:22 | <0.01 | below 0.01 mg/l (not detected above this) |
| 6 Mar 2025, 10:35 | <0.01 | below 0.01 mg/l (not detected above this) |
| 4 Feb 2025, 08:00 | 0.029 | 0.029 mg/l |
| 21 Jan 2025, 11:11 | 0.043 | 0.043 mg/l |
| 3 Dec 2024, 10:18 | 0.037 | 0.037 mg/l |
| 18 Nov 2024, 08:27 | 0.043 | 0.043 mg/l |
| 14 Oct 2024, 09:41 | 0.069 | 0.069 mg/l |
| 16 Sep 2024, 13:36 | 0.034 | 0.034 mg/l |
| 21 Aug 2024, 10:43 | 0.03 | 0.03 mg/l |
| 15 Jul 2024, 08:13 | 0.027 | 0.027 mg/l |
| 26 Jun 2024, 09:45 | 0.035 | 0.035 mg/l |
| 19 Jun 2024, 11:03 | 0.035 | 0.035 mg/l |
| 20 May 2024, 10:20 | 0.013 | 0.013 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
676 µS/cm
Sampled 13 Apr 2026, 6 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Apr 2026, 09:02 | 676 | 676 µS/cm |
| 9 Mar 2026, 12:35 | 685 | 685 µS/cm |
| 11 Feb 2026, 10:46 | 659 | 659 µS/cm |
| 7 Jan 2026, 10:22 | 1053 | 1053 µS/cm |
| 3 Dec 2025, 10:35 | 674 | 674 µS/cm |
| 6 Nov 2025, 09:21 | 666 | 666 µS/cm |
| 14 Oct 2025, 10:42 | 644 | 644 µS/cm |
| 3 Sep 2025, 11:08 | 495 | 495 µS/cm |
| 13 Aug 2025, 11:05 | 647 | 647 µS/cm |
| 3 Jul 2025, 13:13 | 125 | 125 µS/cm |
| 3 Jun 2025, 11:38 | 647 | 647 µS/cm |
| 13 May 2025, 09:31 | 655 | 655 µS/cm |
| 22 Apr 2025, 12:22 | 667 | 667 µS/cm |
| 6 Mar 2025, 10:35 | 683 | 683 µS/cm |
| 4 Feb 2025, 08:00 | 682 | 682 µS/cm |
| 21 Jan 2025, 11:11 | 691 | 691 µS/cm |
| 3 Dec 2024, 10:18 | 688 | 688 µS/cm |
| 18 Nov 2024, 08:27 | 637 | 637 µS/cm |
| 14 Oct 2024, 09:41 | 444 | 444 µS/cm |
| 16 Sep 2024, 13:36 | 636 | 636 µS/cm |
| 21 Aug 2024, 10:43 | 631 | 631 µS/cm |
| 15 Jul 2024, 08:13 | 657 | 657 µS/cm |
| 26 Jun 2024, 09:45 | 673 | 673 µS/cm |
| 19 Jun 2024, 11:03 | 667 | 667 µS/cm |
| 20 May 2024, 10:20 | 717 | 717 µS/cm |
Everything measured here
13 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 13 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 25 | May 2024 – Apr 2026 | 98.7% 13 Apr 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 25 | May 2024 – Apr 2026 | 11.3 mg/l 13 Apr 2026 |
| Temperature of Water 0076 | River water | 25 | May 2024 – Apr 2026 | 9.4 °C 13 Apr 2026 |
| pH 0061 | River water | 25 | May 2024 – Apr 2026 | 8.2 13 Apr 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 25 | May 2024 – Apr 2026 | below 0.03 mg/l 13 Apr 2026 |
| Nitrate as N 0117 | River water | 25 | May 2024 – Apr 2026 | 7.79 mg/l 13 Apr 2026 |
| Orthophosphate, reactive as P 0180 | River water | 25 | May 2024 – Apr 2026 | 0.037 mg/l 13 Apr 2026 |
| Conductivity at 25 C 0077 | River water | 25 | May 2024 – Apr 2026 | 676 µS/cm 13 Apr 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 25 | May 2024 – Apr 2026 | 250 mg/l 13 Apr 2026 |
| Ammonia un-ionised as N 0119 | River water | 25 | May 2024 – Apr 2026 | below 0.00052 mg/l 13 Apr 2026 |
| BOD : 5 Day ATU 0085 | River water | 24 | May 2024 – Apr 2026 | 1.3 mg/l 13 Apr 2026 |
| Nitrite as N 0118 | River water | 25 | May 2024 – Apr 2026 | 0.011 mg/l 13 Apr 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 25 | May 2024 – Apr 2026 | 7.8 mg/l 13 Apr 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.