Preston Farm
EA name: RSN1373 PRESTON FARM
Environment Agency sampling point SO-RSN1373 · 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
- 9 Sep 2026, 12:2222 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 22 since 23 Jan 2025 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Monitoring (UK govt policy - not GQA or RE)
- Where
- National Grid 552244, 162463As published, to the nearest 1 m. Open in a map
- River, by its own name
- Its name does not give one
- River, by the map
- River DarentPlaced by position alone, on a line whose map name differs from its own, 5 m from the line.
- Next gauge downstream
- Hawley On the River Darent · 14 km along the riverHAWLEY GS 14 km along the river
- Nearest gauge upstream
- Otford On the River Darent · 5.3 km along the river
- Why it was sampled
- Monitoring (UK govt policy - not GQA or RE) (15 samples)
Monitoring (national agency policy) (7 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
91.9%
Sampled 13 Aug 2025, 14 months ago · 7 results banked
Every result (7)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Aug 2025, 13:34 | 91.9 | 91.9% |
| 21 Jul 2025, 13:10 | 96 | 96% |
| 7 May 2025, 12:15 | 100.4 | 100.4% |
| 15 Apr 2025, 09:50 | 92.7 | 92.7% |
| 4 Mar 2025, 10:55 | 101.8 | 101.8% |
| 13 Feb 2025, 09:57 | 98.2 | 98.2% |
| 23 Jan 2025, 11:15 | 98.1 | 98.1% |
Dissolved oxygen
as O2 · code 9924 · mg/l
8.5 mg/l
Sampled 13 Aug 2025, 14 months ago · 7 results banked
Every result (7)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Aug 2025, 13:34 | 8.5 | 8.5 mg/l |
| 21 Jul 2025, 13:10 | 8.84 | 8.84 mg/l |
| 7 May 2025, 12:15 | 10.6 | 10.6 mg/l |
| 15 Apr 2025, 09:50 | 9.96 | 9.96 mg/l |
| 4 Mar 2025, 10:55 | 12.7 | 12.7 mg/l |
| 13 Feb 2025, 09:57 | 12.4 | 12.4 mg/l |
| 23 Jan 2025, 11:15 | 12.3 | 12.3 mg/l |
Water temperature
code 0076 · °C
16.2 °C
Sampled 9 Sep 2026, 22 days ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Sep 2026, 12:22 | 16.2 | 16.2 °C |
| 4 Sep 2026, 12:03 | 19.2 | 19.2 °C |
| 27 Aug 2026, 09:31 | 18.4 | 18.4 °C |
| 18 Aug 2026, 09:49 | 18.8 | 18.8 °C |
| 13 Aug 2026, 12:03 | 18.9 | 18.9 °C |
| 6 Aug 2026, 12:43 | 17.5 | 17.5 °C |
| 30 Jul 2026, 11:34 | 18.7 | 18.7 °C |
| 20 Jul 2026, 12:20 | 17 | 17 °C |
| 14 Jul 2026, 10:29 | 17.9 | 17.9 °C |
| 9 Jul 2026, 09:56 | 19.5 | 19.5 °C |
| 3 Jul 2026, 10:24 | 16.8 | 16.8 °C |
| 22 Jun 2026, 13:45 | 20.2 | 20.2 °C |
| 16 Jun 2026, 12:52 | 17.3 | 17.3 °C |
| 8 Jun 2026, 12:04 | 14.9 | 14.9 °C |
| 2 Jun 2026, 10:13 | 16.9 | 16.9 °C |
| 13 Aug 2025, 13:34 | 19 | 19 °C |
| 21 Jul 2025, 13:10 | 19.2 | 19.2 °C |
| 7 May 2025, 12:15 | 12.8 | 12.8 °C |
| 15 Apr 2025, 09:50 | 12 | 12 °C |
| 4 Mar 2025, 10:55 | 6 | 6 °C |
| 13 Feb 2025, 09:57 | 5.4 | 5.4 °C |
| 23 Jan 2025, 11:15 | 5.7 | 5.7 °C |
pH
code 0061
7.85
Sampled 13 Aug 2025, 14 months ago · 7 results banked
Every result (7)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Aug 2025, 13:34 | 7.85 | 7.85 |
| 21 Jul 2025, 13:10 | 7.91 | 7.91 |
| 7 May 2025, 12:15 | 7.85 | 7.85 |
| 15 Apr 2025, 09:50 | 7.8 | 7.8 |
| 4 Mar 2025, 10:55 | 8.12 | 8.12 |
| 13 Feb 2025, 09:57 | 7.95 | 7.95 |
| 23 Jan 2025, 11:15 | 8.08 | 8.08 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.035 mg/l
Sampled 9 Sep 2026, 22 days ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Sep 2026, 12:22 | 0.035 | 0.035 mg/l |
| 4 Sep 2026, 12:03 | <0.03 | below 0.03 mg/l (not detected above this) |
| 27 Aug 2026, 09:31 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Aug 2026, 09:49 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Aug 2026, 12:03 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Aug 2026, 12:43 | <0.03 | below 0.03 mg/l (not detected above this) |
| 30 Jul 2026, 11:34 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Jul 2026, 12:20 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Jul 2026, 10:29 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Jul 2026, 09:56 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Jul 2026, 10:24 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Jun 2026, 13:45 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Jun 2026, 12:52 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Jun 2026, 12:04 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Jun 2026, 10:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Aug 2025, 13:34 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Jul 2025, 13:10 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 May 2025, 12:15 | 0.033 | 0.033 mg/l |
| 15 Apr 2025, 09:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Mar 2025, 10:55 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Feb 2025, 09:57 | 0.053 | 0.053 mg/l |
| 23 Jan 2025, 11:15 | 0.054 | 0.054 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
1.29 mg/l
Sampled 9 Sep 2026, 22 days ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Sep 2026, 12:22 | 1.29 | 1.29 mg/l |
| 4 Sep 2026, 12:03 | 1.3 | 1.3 mg/l |
| 27 Aug 2026, 09:31 | 1.59 | 1.59 mg/l |
| 18 Aug 2026, 09:49 | 1.8 | 1.8 mg/l |
| 13 Aug 2026, 12:03 | 2.1 | 2.1 mg/l |
| 6 Aug 2026, 12:43 | 2.4 | 2.4 mg/l |
| 30 Jul 2026, 11:34 | 3.5 | 3.5 mg/l |
| 20 Jul 2026, 12:20 | 2.7 | 2.7 mg/l |
| 14 Jul 2026, 10:29 | 2.8 | 2.8 mg/l |
| 9 Jul 2026, 09:56 | 2.99 | 2.99 mg/l |
| 3 Jul 2026, 10:24 | 3.19 | 3.19 mg/l |
| 22 Jun 2026, 13:45 | 3.19 | 3.19 mg/l |
| 16 Jun 2026, 12:52 | 3.39 | 3.39 mg/l |
| 8 Jun 2026, 12:04 | 3.29 | 3.29 mg/l |
| 2 Jun 2026, 10:13 | 3.39 | 3.39 mg/l |
| 13 Aug 2025, 13:34 | 2.3 | 2.3 mg/l |
| 21 Jul 2025, 13:10 | 2.39 | 2.39 mg/l |
| 7 May 2025, 12:15 | 4.18 | 4.18 mg/l |
| 15 Apr 2025, 09:50 | 4.48 | 4.48 mg/l |
| 4 Mar 2025, 10:55 | 4.88 | 4.88 mg/l |
| 13 Feb 2025, 09:57 | 4.78 | 4.78 mg/l |
| 23 Jan 2025, 11:15 | 4.68 | 4.68 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.039 mg/l
Sampled 9 Sep 2026, 22 days ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Sep 2026, 12:22 | 0.039 | 0.039 mg/l |
| 4 Sep 2026, 12:03 | 0.037 | 0.037 mg/l |
| 27 Aug 2026, 09:31 | 0.069 | 0.069 mg/l |
| 18 Aug 2026, 09:49 | 0.037 | 0.037 mg/l |
| 13 Aug 2026, 12:03 | 0.035 | 0.035 mg/l |
| 6 Aug 2026, 12:43 | 0.032 | 0.032 mg/l |
| 30 Jul 2026, 11:34 | 0.028 | 0.028 mg/l |
| 20 Jul 2026, 12:20 | 0.03 | 0.03 mg/l |
| 14 Jul 2026, 10:29 | 0.03 | 0.03 mg/l |
| 9 Jul 2026, 09:56 | 0.031 | 0.031 mg/l |
| 3 Jul 2026, 10:24 | 0.034 | 0.034 mg/l |
| 22 Jun 2026, 13:45 | 0.037 | 0.037 mg/l |
| 16 Jun 2026, 12:52 | 0.03 | 0.03 mg/l |
| 8 Jun 2026, 12:04 | 0.036 | 0.036 mg/l |
| 2 Jun 2026, 10:13 | 0.049 | 0.049 mg/l |
| 13 Aug 2025, 13:34 | 0.025 | 0.025 mg/l |
| 21 Jul 2025, 13:10 | 0.029 | 0.029 mg/l |
| 7 May 2025, 12:15 | 0.034 | 0.034 mg/l |
| 15 Apr 2025, 09:50 | <0.01 | below 0.01 mg/l (not detected above this) |
| 4 Mar 2025, 10:55 | 0.041 | 0.041 mg/l |
| 13 Feb 2025, 09:57 | 0.062 | 0.062 mg/l |
| 23 Jan 2025, 11:15 | 0.068 | 0.068 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
521 µS/cm
Sampled 13 Aug 2025, 14 months ago · 7 results banked
Every result (7)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Aug 2025, 13:34 | 521 | 521 µS/cm |
| 21 Jul 2025, 13:10 | 522 | 522 µS/cm |
| 7 May 2025, 12:15 | 581 | 581 µS/cm |
| 15 Apr 2025, 09:50 | 580 | 580 µS/cm |
| 4 Mar 2025, 10:55 | 612 | 612 µS/cm |
| 13 Feb 2025, 09:57 | 595 | 595 µS/cm |
| 23 Jan 2025, 11:15 | 586 | 586 µS/cm |
Everything measured here
22 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 22 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 7 | Jan 2025 – Aug 2025 | 91.9% 13 Aug 2025 |
| Oxygen, Dissolved as O2 9924 | River water | 7 | Jan 2025 – Aug 2025 | 8.5 mg/l 13 Aug 2025 |
| Temperature of Water 0076 | River water | 22 | Jan 2025 – Sep 2026 | 16.2 °C 9 Sep 2026 |
| pH 0061 | River water | 7 | Jan 2025 – Aug 2025 | 7.85 13 Aug 2025 |
| Ammoniacal Nitrogen as N 0111 | River water | 22 | Jan 2025 – Sep 2026 | 0.035 mg/l 9 Sep 2026 |
| Nitrate as N 0117 | River water | 22 | Jan 2025 – Sep 2026 | 1.29 mg/l 9 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 22 | Jan 2025 – Sep 2026 | 0.039 mg/l 9 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 7 | Jan 2025 – Aug 2025 | 521 µS/cm 13 Aug 2025 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 7 | Jan 2025 – Aug 2025 | 170 mg/l 13 Aug 2025 |
| Ammonia un-ionised as N 0119 | River water | 7 | Jan 2025 – Aug 2025 | below 0.00075 mg/l 13 Aug 2025 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 7 | Jan 2025 – Aug 2025 | 2.2 mg/l 13 Aug 2025 |
| Chloride 0172 | River water | 7 | Jan 2025 – Aug 2025 | 35 mg/l 13 Aug 2025 |
| Flow Type 2896 | River water | 7 | Jan 2025 – Aug 2025 | Moderate Flow 13 Aug 2025 |
| Nitrite as N 0118 | River water | 22 | Jan 2025 – Sep 2026 | 0.0067 mg/l 9 Sep 2026 |
| Nitrogen, Kjeldahl as N 0114 | River water | 15 | Jun 2026 – Sep 2026 | 0.7 mg/l 9 Sep 2026 |
| Nitrogen, Organic as N 0113 | River water | 15 | Jun 2026 – Sep 2026 | 0.665 mg/l 9 Sep 2026 |
| Nitrogen, Total as N 9686 | River water | 22 | Jan 2025 – Sep 2026 | 2 mg/l 9 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 22 | Jan 2025 – Sep 2026 | 1.3 mg/l 9 Sep 2026 |
| Phosphate :- {TIP} 0192 | River water | 15 | Jun 2026 – Sep 2026 | 0.071 mg/l 9 Sep 2026 |
| Phosphorus, Total as P 0348 | River water | 22 | Jan 2025 – Sep 2026 | 0.096 mg/l 9 Sep 2026 |
| Silica, reactive as SiO2 0182 | River water | 7 | Jan 2025 – Aug 2025 | 6.8 mg/l 13 Aug 2025 |
| Solids, Suspended at 105 C 0135 | River water | 15 | Jun 2026 – Sep 2026 | 23 mg/l 9 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.