Sevenoaks Reserve
EA name: SEVENOAKS RESERVE (also listed as “RSN2193 SEVENOAKS RESERVE”)
Environment Agency sampling point SO-RSN2193 · 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
- 11 Dec 2025, 13:0810 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
- 24 since 11 Jan 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 551972, 157125As 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, 0 m from the line.
- Next gauge downstream
- Otford On the River Darent · 1.7 km along the river
- Nearest gauge upstream
- Park Farm On the River Darent · 7.5 km along the river
- Why it was sampled
- Monitoring (national agency policy) (24 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
84.1%
Sampled 11 Dec 2025, 10 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Dec 2025, 13:08 | 84.1 | 84.1% |
| 28 Nov 2025, 13:44 | 83.8 | 83.8% |
| 3 Oct 2025, 13:25 | 94 | 94% |
| 16 Sep 2025, 10:32 | 87.4 | 87.4% |
| 6 Aug 2025, 14:21 | 110.3 | 110.3% |
| 11 Jul 2025, 11:32 | 111.3 | 111.3% |
| 9 Jun 2025, 11:59 | 92.6 | 92.6% |
| 16 May 2025, 12:21 | 97.5 | 97.5% |
| 9 Apr 2025, 11:57 | 102.4 | 102.4% |
| 12 Mar 2025, 13:38 | 108.1 | 108.1% |
| 12 Feb 2025, 11:03 | 95.8 | 95.8% |
| 9 Jan 2025, 13:08 | 92.2 | 92.2% |
| 5 Dec 2024, 12:26 | 84.5 | 84.5% |
| 11 Nov 2024, 11:31 | 74.7 | 74.7% |
| 9 Oct 2024, 13:01 | 85.4 | 85.4% |
| 4 Sep 2024, 10:51 | 85.2 | 85.2% |
| 6 Aug 2024, 13:22 | 124.5 | 124.5% |
| 10 Jul 2024, 13:34 | 100 | 100% |
| 12 Jun 2024, 12:30 | 114.1 | 114.1% |
| 8 May 2024, 12:53 | 100.5 | 100.5% |
| 9 Apr 2024, 10:05 | 96.4 | 96.4% |
| 6 Mar 2024, 13:30 | 96 | 96% |
| 8 Feb 2024, 11:51 | 96.2 | 96.2% |
| 11 Jan 2024, 13:28 | 90.4 | 90.4% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.8 mg/l
Sampled 11 Dec 2025, 10 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Dec 2025, 13:08 | 9.8 | 9.8 mg/l |
| 28 Nov 2025, 13:44 | 9.81 | 9.81 mg/l |
| 3 Oct 2025, 13:25 | 9.49 | 9.49 mg/l |
| 16 Sep 2025, 10:32 | 8.62 | 8.62 mg/l |
| 6 Aug 2025, 14:21 | 9.9 | 9.9 mg/l |
| 11 Jul 2025, 11:32 | 9.43 | 9.43 mg/l |
| 9 Jun 2025, 11:59 | 8.87 | 8.87 mg/l |
| 16 May 2025, 12:21 | 9.47 | 9.47 mg/l |
| 9 Apr 2025, 11:57 | 11.3 | 11.3 mg/l |
| 12 Mar 2025, 13:38 | 12.7 | 12.7 mg/l |
| 12 Feb 2025, 11:03 | 12.2 | 12.2 mg/l |
| 9 Jan 2025, 13:08 | 11.6 | 11.6 mg/l |
| 5 Dec 2024, 12:26 | 9.7 | 9.7 mg/l |
| 11 Nov 2024, 11:31 | 8.12 | 8.12 mg/l |
| 9 Oct 2024, 13:01 | 8.64 | 8.64 mg/l |
| 4 Sep 2024, 10:51 | 7.85 | 7.85 mg/l |
| 6 Aug 2024, 13:22 | 10.9 | 10.9 mg/l |
| 10 Jul 2024, 13:34 | 9.33 | 9.33 mg/l |
| 12 Jun 2024, 12:30 | 11.1 | 11.1 mg/l |
| 8 May 2024, 12:53 | 10.1 | 10.1 mg/l |
| 9 Apr 2024, 10:05 | 10.5 | 10.5 mg/l |
| 6 Mar 2024, 13:30 | 11.1 | 11.1 mg/l |
| 8 Feb 2024, 11:51 | 11.5 | 11.5 mg/l |
| 11 Jan 2024, 13:28 | 11.7 | 11.7 mg/l |
Water temperature
code 0076 · °C
8.6 °C
Sampled 11 Dec 2025, 10 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Dec 2025, 13:08 | 8.6 | 8.6 °C |
| 28 Nov 2025, 13:44 | 8.4 | 8.4 °C |
| 3 Oct 2025, 13:25 | 14.8 | 14.8 °C |
| 16 Sep 2025, 10:32 | 15.9 | 15.9 °C |
| 6 Aug 2025, 14:21 | 20.5 | 20.5 °C |
| 11 Jul 2025, 11:32 | 23.5 | 23.5 °C |
| 9 Jun 2025, 11:59 | 17.3 | 17.3 °C |
| 16 May 2025, 12:21 | 16.6 | 16.6 °C |
| 9 Apr 2025, 11:57 | 10.8 | 10.8 °C |
| 12 Mar 2025, 13:38 | 8.2 | 8.2 °C |
| 12 Feb 2025, 11:03 | 5.1 | 5.1 °C |
| 9 Jan 2025, 13:08 | 5.4 | 5.4 °C |
| 5 Dec 2024, 12:26 | 9.2 | 9.2 °C |
| 11 Nov 2024, 11:31 | 11.5 | 11.5 °C |
| 9 Oct 2024, 13:01 | 14.7 | 14.7 °C |
| 4 Sep 2024, 10:51 | 19.2 | 19.2 °C |
| 6 Aug 2024, 13:22 | 22 | 22 °C |
| 10 Jul 2024, 13:34 | 18.6 | 18.6 °C |
| 12 Jun 2024, 12:30 | 16.7 | 16.7 °C |
| 8 May 2024, 12:53 | 15.1 | 15.1 °C |
| 9 Apr 2024, 10:05 | 11.4 | 11.4 °C |
| 6 Mar 2024, 13:30 | 8.9 | 8.9 °C |
| 8 Feb 2024, 11:51 | 7.5 | 7.5 °C |
| 11 Jan 2024, 13:28 | 4.5 | 4.5 °C |
pH
code 0061
7.92
Sampled 11 Dec 2025, 10 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Dec 2025, 13:08 | 7.92 | 7.92 |
| 28 Nov 2025, 13:44 | 7.94 | 7.94 |
| 3 Oct 2025, 13:25 | 8.13 | 8.13 |
| 16 Sep 2025, 10:32 | 7.98 | 7.98 |
| 6 Aug 2025, 14:21 | 8.07 | 8.07 |
| 11 Jul 2025, 11:32 | 8.13 | 8.13 |
| 9 Jun 2025, 11:59 | 7.82 | 7.82 |
| 16 May 2025, 12:21 | 7.99 | 7.99 |
| 9 Apr 2025, 11:57 | 8.18 | 8.18 |
| 12 Mar 2025, 13:38 | 8.13 | 8.13 |
| 12 Feb 2025, 11:03 | 7.9 | 7.9 |
| 9 Jan 2025, 13:08 | 6.08 | 6.08 |
| 5 Dec 2024, 12:26 | 7.8 | 7.8 |
| 11 Nov 2024, 11:31 | 7.68 | 7.68 |
| 9 Oct 2024, 13:01 | 7.76 | 7.76 |
| 4 Sep 2024, 10:51 | 7.77 | 7.77 |
| 6 Aug 2024, 13:22 | 8.05 | 8.05 |
| 10 Jul 2024, 13:34 | 8.04 | 8.04 |
| 12 Jun 2024, 12:30 | 8.16 | 8.16 |
| 8 May 2024, 12:53 | 8.5 | 8.5 |
| 9 Apr 2024, 10:05 | 8.09 | 8.09 |
| 6 Mar 2024, 13:30 | 7.89 | 7.89 |
| 8 Feb 2024, 11:51 | 8.03 | 8.03 |
| 11 Jan 2024, 13:28 | 8.2 | 8.2 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.099 mg/l
Sampled 11 Dec 2025, 10 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Dec 2025, 13:08 | 0.099 | 0.099 mg/l |
| 28 Nov 2025, 13:44 | 0.071 | 0.071 mg/l |
| 3 Oct 2025, 13:25 | 0.041 | 0.041 mg/l |
| 16 Sep 2025, 10:32 | 0.053 | 0.053 mg/l |
| 6 Aug 2025, 14:21 | 0.063 | 0.063 mg/l |
| 11 Jul 2025, 11:32 | 0.062 | 0.062 mg/l |
| 9 Jun 2025, 11:59 | 0.058 | 0.058 mg/l |
| 16 May 2025, 12:21 | 0.084 | 0.084 mg/l |
| 9 Apr 2025, 11:57 | 0.032 | 0.032 mg/l |
| 12 Mar 2025, 13:38 | 0.0099 | 0.0099 mg/l |
| 12 Feb 2025, 11:03 | 0.021 | 0.021 mg/l |
| 9 Jan 2025, 13:08 | 0.036 | 0.036 mg/l |
| 5 Dec 2024, 12:26 | 0.022 | 0.022 mg/l |
| 11 Nov 2024, 11:31 | 0.076 | 0.076 mg/l |
| 9 Oct 2024, 13:01 | 0.073 | 0.073 mg/l |
| 4 Sep 2024, 10:51 | 0.066 | 0.066 mg/l |
| 6 Aug 2024, 13:22 | 0.055 | 0.055 mg/l |
| 10 Jul 2024, 13:34 | 0.047 | 0.047 mg/l |
| 12 Jun 2024, 12:30 | 0.053 | 0.053 mg/l |
| 8 May 2024, 12:53 | 0.013 | 0.013 mg/l |
| 9 Apr 2024, 10:05 | 0.012 | 0.012 mg/l |
| 6 Mar 2024, 13:30 | 0.02 | 0.02 mg/l |
| 8 Feb 2024, 11:51 | 0.019 | 0.019 mg/l |
| 11 Jan 2024, 13:28 | 0.021 | 0.021 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
2.25 mg/l
Sampled 11 Dec 2025, 10 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Dec 2025, 13:08 | 2.25 | 2.25 mg/l |
| 28 Nov 2025, 13:44 | 1.86 | 1.86 mg/l |
| 3 Oct 2025, 13:25 | 1.08 | 1.08 mg/l |
| 16 Sep 2025, 10:32 | 0.977 | 0.977 mg/l |
| 6 Aug 2025, 14:21 | 1.47 | 1.47 mg/l |
| 11 Jul 2025, 11:32 | 2.17 | 2.17 mg/l |
| 9 Jun 2025, 11:59 | 3.06 | 3.06 mg/l |
| 16 May 2025, 12:21 | 3.87 | 3.87 mg/l |
| 9 Apr 2025, 11:57 | 4.38 | 4.38 mg/l |
| 12 Mar 2025, 13:38 | 4.88 | 4.88 mg/l |
| 12 Feb 2025, 11:03 | 4.66 | 4.66 mg/l |
| 9 Jan 2025, 13:08 | 4.18 | 4.18 mg/l |
| 5 Dec 2024, 12:26 | 3.38 | 3.38 mg/l |
| 11 Nov 2024, 11:31 | 3.24 | 3.24 mg/l |
| 9 Oct 2024, 13:01 | 2.75 | 2.75 mg/l |
| 4 Sep 2024, 10:51 | 2.37 | 2.37 mg/l |
| 6 Aug 2024, 13:22 | 2.67 | 2.67 mg/l |
| 10 Jul 2024, 13:34 | 3.26 | 3.26 mg/l |
| 12 Jun 2024, 12:30 | 4.06 | 4.06 mg/l |
| 8 May 2024, 12:53 | 4.37 | 4.37 mg/l |
| 9 Apr 2024, 10:05 | 4.38 | 4.38 mg/l |
| 6 Mar 2024, 13:30 | 4.07 | 4.07 mg/l |
| 8 Feb 2024, 11:51 | 4.57 | 4.57 mg/l |
| 11 Jan 2024, 13:28 | 3.91 | 3.91 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.041 mg/l
Sampled 11 Dec 2025, 10 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Dec 2025, 13:08 | 0.041 | 0.041 mg/l |
| 28 Nov 2025, 13:44 | 0.03 | 0.03 mg/l |
| 3 Oct 2025, 13:25 | 0.0034 | 0.0034 mg/l |
| 16 Sep 2025, 10:32 | 0.0051 | 0.0051 mg/l |
| 6 Aug 2025, 14:21 | 0.014 | 0.014 mg/l |
| 11 Jul 2025, 11:32 | 0.006 | 0.006 mg/l |
| 9 Jun 2025, 11:59 | 0.012 | 0.012 mg/l |
| 16 May 2025, 12:21 | 0.019 | 0.019 mg/l |
| 9 Apr 2025, 11:57 | 0.0056 | 0.0056 mg/l |
| 12 Mar 2025, 13:38 | 0.056 | 0.056 mg/l |
| 12 Feb 2025, 11:03 | 0.08 | 0.08 mg/l |
| 9 Jan 2025, 13:08 | 0.096 | 0.096 mg/l |
| 5 Dec 2024, 12:26 | 0.068 | 0.068 mg/l |
| 11 Nov 2024, 11:31 | 0.052 | 0.052 mg/l |
| 9 Oct 2024, 13:01 | 0.042 | 0.042 mg/l |
| 4 Sep 2024, 10:51 | 0.027 | 0.027 mg/l |
| 6 Aug 2024, 13:22 | 0.0011 | 0.0011 mg/l |
| 10 Jul 2024, 13:34 | 0.0043 | 0.0043 mg/l |
| 12 Jun 2024, 12:30 | 0.004 | 0.004 mg/l |
| 8 May 2024, 12:53 | 0.015 | 0.015 mg/l |
| 9 Apr 2024, 10:05 | 0.057 | 0.057 mg/l |
| 6 Mar 2024, 13:30 | 0.08 | 0.08 mg/l |
| 8 Feb 2024, 11:51 | 0.071 | 0.071 mg/l |
| 11 Jan 2024, 13:28 | 0.084 | 0.084 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
522 µS/cm
Sampled 11 Dec 2025, 10 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Dec 2025, 13:08 | 522 | 522 µS/cm |
| 28 Nov 2025, 13:44 | 528 | 528 µS/cm |
| 3 Oct 2025, 13:25 | 490 | 490 µS/cm |
| 16 Sep 2025, 10:32 | 471 | 471 µS/cm |
| 6 Aug 2025, 14:21 | 484 | 484 µS/cm |
| 11 Jul 2025, 11:32 | 500 | 500 µS/cm |
| 9 Jun 2025, 11:59 | 531 | 531 µS/cm |
| 16 May 2025, 12:21 | 553 | 553 µS/cm |
| 9 Apr 2025, 11:57 | 572 | 572 µS/cm |
| 12 Mar 2025, 13:38 | 569 | 569 µS/cm |
| 12 Feb 2025, 11:03 | 574 | 574 µS/cm |
| 9 Jan 2025, 13:08 | 524 | 524 µS/cm |
| 5 Dec 2024, 12:26 | 502 | 502 µS/cm |
| 11 Nov 2024, 11:31 | 504 | 504 µS/cm |
| 9 Oct 2024, 13:01 | 477 | 477 µS/cm |
| 4 Sep 2024, 10:51 | 504 | 504 µS/cm |
| 6 Aug 2024, 13:22 | 483 | 483 µS/cm |
| 10 Jul 2024, 13:34 | 514 | 514 µS/cm |
| 12 Jun 2024, 12:30 | 539 | 539 µS/cm |
| 8 May 2024, 12:53 | 532 | 532 µS/cm |
| 9 Apr 2024, 10:05 | 520 | 520 µS/cm |
| 6 Mar 2024, 13:30 | 517 | 517 µS/cm |
| 8 Feb 2024, 11:51 | 533 | 533 µS/cm |
| 11 Jan 2024, 13:28 | 508 | 508 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 | 24 | Jan 2024 – Dec 2025 | 84.1% 11 Dec 2025 |
| Oxygen, Dissolved as O2 9924 | River water | 24 | Jan 2024 – Dec 2025 | 9.8 mg/l 11 Dec 2025 |
| Temperature of Water 0076 | River water | 24 | Jan 2024 – Dec 2025 | 8.6 °C 11 Dec 2025 |
| pH 0061 | River water | 24 | Jan 2024 – Dec 2025 | 7.92 11 Dec 2025 |
| Ammoniacal Nitrogen as N 0111 | River water | 24 | Jan 2024 – Dec 2025 | 0.099 mg/l 11 Dec 2025 |
| Nitrate as N 0117 | River water | 24 | Jan 2024 – Dec 2025 | 2.25 mg/l 11 Dec 2025 |
| Orthophosphate, reactive as P 0180 | River water | 24 | Jan 2024 – Dec 2025 | 0.041 mg/l 11 Dec 2025 |
| Conductivity at 25 C 0077 | River water | 24 | Jan 2024 – Dec 2025 | 522 µS/cm 11 Dec 2025 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 23 | Jan 2024 – Dec 2025 | 170 mg/l 11 Dec 2025 |
| Ammonia un-ionised as N 0119 | River water | 24 | Jan 2024 – Dec 2025 | 0.00136 mg/l 11 Dec 2025 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 24 | Jan 2024 – Dec 2025 | 3 mg/l 11 Dec 2025 |
| Chloride 0172 | River water | 23 | Jan 2024 – Dec 2025 | 39 mg/l 11 Dec 2025 |
| Flow Type 2896 | River water | 17 | Jul 2024 – Dec 2025 | Moderate Flow 11 Dec 2025 |
| Nitrite as N 0118 | River water | 24 | Jan 2024 – Dec 2025 | 0.053 mg/l 11 Dec 2025 |
| Nitrogen, Total Oxidised as N 0116 | River water | 24 | Jan 2024 – Dec 2025 | 2.3 mg/l 11 Dec 2025 |
| Phosphorus, Total as P 0348 | River water | 24 | Jan 2024 – Dec 2025 | 0.05 mg/l 11 Dec 2025 |
| Silica, reactive as SiO2 0182 | River water | 24 | Jan 2024 – Dec 2025 | 16 mg/l 11 Dec 2025 |
| Solids, Suspended at 105 C 0135 | River water | 1 | Dec 2025 – Dec 2025 | 4.7 mg/l 11 Dec 2025 |
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.