Chertsey Bourne at Buckhurst Road
EA name: CHERTSEY BOURNE AT BUCKHURST ROAD
Environment Agency sampling point TH-PBNR0057 · 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
- 23 Jul 2026, 09:462 months ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 26 since 24 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 494564, 169362As published, to the nearest 1 m. Open in a map
- River, by its own name
- Chertsey Bourne
- River, by the map
- An unnamed streamPlaced by position alone (the only river line close by), 5 m from the line.
- Next gauge downstream
- Trumps Green On the Chertsey Bourne · 7.0 km along the river
- Why it was sampled
- Environmental monitoring statutory (EU directives) (26 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
83.5%
Sampled 23 Jul 2026, 2 months ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 23 Jul 2026, 09:46 | 83.5 | 83.5% |
| 15 Jun 2026, 09:14 | 86 | 86% |
| 7 May 2026, 09:53 | 93.3 | 93.3% |
| 9 Apr 2026, 12:20 | 95 | 95% |
| 13 Mar 2026, 09:29 | 94.7 | 94.7% |
| 6 Feb 2026, 09:48 | 95.2 | 95.2% |
| 9 Jan 2026, 10:36 | 94.9 | 94.9% |
| 11 Dec 2025, 10:49 | 91 | 91% |
| 12 Nov 2025, 10:43 | 87.8 | 87.8% |
| 8 Oct 2025, 11:44 | 87.4 | 87.4% |
| 17 Sep 2025, 10:50 | 87 | 87% |
| 22 Aug 2025, 10:52 | 89.5 | 89.5% |
| 22 Jul 2025, 09:01 | 83.3 | 83.3% |
| 19 Jun 2025, 10:58 | 87 | 87% |
| 28 May 2025, 12:56 | 89.2 | 89.2% |
| 22 Apr 2025, 11:04 | 87.6 | 87.6% |
| 5 Mar 2025, 11:17 | 96.1 | 96.1% |
| 6 Feb 2025, 09:26 | 97 | 97% |
| 9 Jan 2025, 10:49 | 96.7 | 96.7% |
| 10 Dec 2024, 10:15 | 94.9 | 94.9% |
| 7 Nov 2024, 09:38 | 91.1 | 91.1% |
| 9 Oct 2024, 09:37 | 92 | 92% |
| 13 Sep 2024, 08:57 | 90.5 | 90.5% |
| 22 Aug 2024, 11:28 | 89.1 | 89.1% |
| 23 Jul 2024, 11:47 | 88.8 | 88.8% |
| 24 Jun 2024, 12:57 | 88.1 | 88.1% |
Dissolved oxygen
as O2 · code 9924 · mg/l
7.7 mg/l
Sampled 23 Jul 2026, 2 months ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 23 Jul 2026, 09:46 | 7.7 | 7.7 mg/l |
| 15 Jun 2026, 09:14 | 8.39 | 8.39 mg/l |
| 7 May 2026, 09:53 | 10 | 10 mg/l |
| 9 Apr 2026, 12:20 | 9.79 | 9.79 mg/l |
| 13 Mar 2026, 09:29 | 11 | 11 mg/l |
| 6 Feb 2026, 09:48 | 11.3 | 11.3 mg/l |
| 9 Jan 2026, 10:36 | 12.4 | 12.4 mg/l |
| 11 Dec 2025, 10:49 | 10.8 | 10.8 mg/l |
| 12 Nov 2025, 10:43 | 9.44 | 9.44 mg/l |
| 8 Oct 2025, 11:44 | 9.15 | 9.15 mg/l |
| 17 Sep 2025, 10:50 | 8.87 | 8.87 mg/l |
| 22 Aug 2025, 10:52 | 8.98 | 8.98 mg/l |
| 22 Jul 2025, 09:01 | 7.87 | 7.87 mg/l |
| 19 Jun 2025, 10:58 | 7.92 | 7.92 mg/l |
| 28 May 2025, 12:56 | 8.84 | 8.84 mg/l |
| 22 Apr 2025, 11:04 | 9.59 | 9.59 mg/l |
| 5 Mar 2025, 11:17 | 12.4 | 12.4 mg/l |
| 6 Feb 2025, 09:26 | 12.7 | 12.7 mg/l |
| 9 Jan 2025, 10:49 | 12.7 | 12.7 mg/l |
| 10 Dec 2024, 10:15 | 11.4 | 11.4 mg/l |
| 7 Nov 2024, 09:38 | 10 | 10 mg/l |
| 9 Oct 2024, 09:37 | 9.71 | 9.71 mg/l |
| 13 Sep 2024, 08:57 | 10.2 | 10.2 mg/l |
| 22 Aug 2024, 11:28 | 8.72 | 8.72 mg/l |
| 23 Jul 2024, 11:47 | 8.37 | 8.37 mg/l |
| 24 Jun 2024, 12:57 | 8.22 | 8.22 mg/l |
Water temperature
code 0076 · °C
19.2 °C
Sampled 23 Jul 2026, 2 months ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 23 Jul 2026, 09:46 | 19.2 | 19.2 °C |
| 15 Jun 2026, 09:14 | 16.4 | 16.4 °C |
| 7 May 2026, 09:53 | 12.1 | 12.1 °C |
| 9 Apr 2026, 12:20 | 13.9 | 13.9 °C |
| 13 Mar 2026, 09:29 | 8.8 | 8.8 °C |
| 6 Feb 2026, 09:48 | 7.8 | 7.8 °C |
| 9 Jan 2026, 10:36 | 4.2 | 4.2 °C |
| 11 Dec 2025, 10:49 | 7.7 | 7.7 °C |
| 12 Nov 2025, 10:43 | 12 | 12 °C |
| 8 Oct 2025, 11:44 | 13.2 | 13.2 °C |
| 17 Sep 2025, 10:50 | 14.4 | 14.4 °C |
| 22 Aug 2025, 10:52 | 15.1 | 15.1 °C |
| 22 Jul 2025, 09:01 | 18 | 18 °C |
| 19 Jun 2025, 10:58 | 19.8 | 19.8 °C |
| 28 May 2025, 12:56 | 15.7 | 15.7 °C |
| 22 Apr 2025, 11:04 | 11.2 | 11.2 °C |
| 5 Mar 2025, 11:17 | 4.7 | 4.7 °C |
| 6 Feb 2025, 09:26 | 3.9 | 3.9 °C |
| 9 Jan 2025, 10:49 | 3.8 | 3.8 °C |
| 10 Dec 2024, 10:15 | 7.2 | 7.2 °C |
| 7 Nov 2024, 09:38 | 10.9 | 10.9 °C |
| 9 Oct 2024, 09:37 | 12.8 | 12.8 °C |
| 13 Sep 2024, 08:57 | 9.8 | 9.8 °C |
| 22 Aug 2024, 11:28 | 16.3 | 16.3 °C |
| 23 Jul 2024, 11:47 | 18.1 | 18.1 °C |
| 24 Jun 2024, 12:57 | 18.6 | 18.6 °C |
pH
code 0061
7.46
Sampled 23 Jul 2026, 2 months ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 23 Jul 2026, 09:46 | 7.46 | 7.46 |
| 15 Jun 2026, 09:14 | 7.41 | 7.41 |
| 7 May 2026, 09:53 | 7.49 | 7.49 |
| 9 Apr 2026, 12:20 | 7.64 | 7.64 |
| 13 Mar 2026, 09:29 | 7.33 | 7.33 |
| 6 Feb 2026, 09:48 | 7.2 | 7.2 |
| 9 Jan 2026, 10:36 | 7.28 | 7.28 |
| 11 Dec 2025, 10:49 | 7.33 | 7.33 |
| 12 Nov 2025, 10:43 | 7.23 | 7.23 |
| 8 Oct 2025, 11:44 | 7.35 | 7.35 |
| 17 Sep 2025, 10:50 | 7.45 | 7.45 |
| 22 Aug 2025, 10:52 | 7.52 | 7.52 |
| 22 Jul 2025, 09:01 | 7.47 | 7.47 |
| 19 Jun 2025, 10:58 | 7.54 | 7.54 |
| 28 May 2025, 12:56 | 7.45 | 7.45 |
| 22 Apr 2025, 11:04 | 7.55 | 7.55 |
| 5 Mar 2025, 11:17 | 7.75 | 7.75 |
| 6 Feb 2025, 09:26 | 7.51 | 7.51 |
| 9 Jan 2025, 10:49 | 7.28 | 7.28 |
| 10 Dec 2024, 10:15 | 7.52 | 7.52 |
| 7 Nov 2024, 09:38 | 7.47 | 7.47 |
| 9 Oct 2024, 09:37 | 7.29 | 7.29 |
| 13 Sep 2024, 08:57 | 7.53 | 7.53 |
| 22 Aug 2024, 11:28 | 7.35 | 7.35 |
| 23 Jul 2024, 11:47 | 7.69 | 7.69 |
| 24 Jun 2024, 12:57 | 7.6 | 7.6 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 23 Jul 2026, 2 months ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 23 Jul 2026, 09:46 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Jun 2026, 09:14 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 May 2026, 09:53 | 0.079 | 0.079 mg/l |
| 9 Apr 2026, 12:20 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Mar 2026, 09:29 | 0.12 | 0.12 mg/l |
| 6 Feb 2026, 09:48 | 0.069 | 0.069 mg/l |
| 9 Jan 2026, 10:36 | 0.22 | 0.22 mg/l |
| 11 Dec 2025, 10:49 | 0.22 | 0.22 mg/l |
| 12 Nov 2025, 10:43 | 0.21 | 0.21 mg/l |
| 8 Oct 2025, 11:44 | 0.1 | 0.1 mg/l |
| 17 Sep 2025, 10:50 | 0.15 | 0.15 mg/l |
| 22 Aug 2025, 10:52 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Jul 2025, 09:01 | 0.066 | 0.066 mg/l |
| 19 Jun 2025, 10:58 | <0.03 | below 0.03 mg/l (not detected above this) |
| 28 May 2025, 12:56 | 0.22 | 0.22 mg/l |
| 22 Apr 2025, 11:04 | 0.15 | 0.15 mg/l |
| 5 Mar 2025, 11:17 | 0.14 | 0.14 mg/l |
| 6 Feb 2025, 09:26 | 0.16 | 0.16 mg/l |
| 9 Jan 2025, 10:49 | 0.12 | 0.12 mg/l |
| 10 Dec 2024, 10:15 | 0.12 | 0.12 mg/l |
| 7 Nov 2024, 09:38 | 0.13 | 0.13 mg/l |
| 9 Oct 2024, 09:37 | 0.095 | 0.095 mg/l |
| 13 Sep 2024, 08:57 | 0.13 | 0.13 mg/l |
| 22 Aug 2024, 11:28 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Jul 2024, 11:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Jun 2024, 12:57 | 0.034 | 0.034 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
0.506 mg/l
Sampled 23 Jul 2026, 2 months ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 23 Jul 2026, 09:46 | 0.506 | 0.506 mg/l |
| 15 Jun 2026, 09:14 | 0.706 | 0.706 mg/l |
| 7 May 2026, 09:53 | 0.458 | 0.458 mg/l |
| 9 Apr 2026, 12:20 | 0.406 | 0.406 mg/l |
| 13 Mar 2026, 09:29 | 0.376 | 0.376 mg/l |
| 6 Feb 2026, 09:48 | 0.586 | 0.586 mg/l |
| 9 Jan 2026, 10:36 | 0.656 | 0.656 mg/l |
| 11 Dec 2025, 10:49 | 0.564 | 0.564 mg/l |
| 12 Nov 2025, 10:43 | 0.376 | 0.376 mg/l |
| 8 Oct 2025, 11:44 | 0.591 | 0.591 mg/l |
| 17 Sep 2025, 10:50 | 0.534 | 0.534 mg/l |
| 22 Aug 2025, 10:52 | 0.466 | 0.466 mg/l |
| 22 Jul 2025, 09:01 | 0.607 | 0.607 mg/l |
| 19 Jun 2025, 10:58 | 0.678 | 0.678 mg/l |
| 28 May 2025, 12:56 | 0.515 | 0.515 mg/l |
| 22 Apr 2025, 11:04 | 0.376 | 0.376 mg/l |
| 5 Mar 2025, 11:17 | 0.396 | 0.396 mg/l |
| 6 Feb 2025, 09:26 | 0.356 | 0.356 mg/l |
| 9 Jan 2025, 10:49 | 0.456 | 0.456 mg/l |
| 10 Dec 2024, 10:15 | 0.336 | 0.336 mg/l |
| 7 Nov 2024, 09:38 | 0.286 | 0.286 mg/l |
| 9 Oct 2024, 09:37 | 0.266 | 0.266 mg/l |
| 13 Sep 2024, 08:57 | 0.543 | 0.543 mg/l |
| 22 Aug 2024, 11:28 | 0.396 | 0.396 mg/l |
| 23 Jul 2024, 11:47 | 0.326 | 0.326 mg/l |
| 24 Jun 2024, 12:57 | 0.316 | 0.316 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.013 mg/l
Sampled 23 Jul 2026, 2 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 23 Jul 2026, 09:46 | 0.013 | 0.013 mg/l |
| 15 Jun 2026, 09:14 | 0.021 | 0.021 mg/l |
| 9 Apr 2026, 12:20 | 0.016 | 0.016 mg/l |
| 13 Mar 2026, 09:29 | 0.016 | 0.016 mg/l |
| 6 Feb 2026, 09:48 | 0.021 | 0.021 mg/l |
| 9 Jan 2026, 10:36 | <0.01 | below 0.01 mg/l (not detected above this) |
| 11 Dec 2025, 10:49 | 0.011 | 0.011 mg/l |
| 12 Nov 2025, 10:43 | 0.015 | 0.015 mg/l |
| 8 Oct 2025, 11:44 | <0.01 | below 0.01 mg/l (not detected above this) |
| 17 Sep 2025, 10:50 | <0.01 | below 0.01 mg/l (not detected above this) |
| 22 Aug 2025, 10:52 | 0.014 | 0.014 mg/l |
| 22 Jul 2025, 09:01 | 0.022 | 0.022 mg/l |
| 19 Jun 2025, 10:58 | <0.01 | below 0.01 mg/l (not detected above this) |
| 28 May 2025, 12:56 | 0.013 | 0.013 mg/l |
| 22 Apr 2025, 11:04 | <0.01 | below 0.01 mg/l (not detected above this) |
| 5 Mar 2025, 11:17 | 0.021 | 0.021 mg/l |
| 6 Feb 2025, 09:26 | 0.018 | 0.018 mg/l |
| 9 Jan 2025, 10:49 | 0.019 | 0.019 mg/l |
| 10 Dec 2024, 10:15 | <0.01 | below 0.01 mg/l (not detected above this) |
| 7 Nov 2024, 09:38 | 0.013 | 0.013 mg/l |
| 9 Oct 2024, 09:37 | 0.029 | 0.029 mg/l |
| 13 Sep 2024, 08:57 | 0.025 | 0.025 mg/l |
| 22 Aug 2024, 11:28 | <0.01 | below 0.01 mg/l (not detected above this) |
| 23 Jul 2024, 11:47 | <0.01 | below 0.01 mg/l (not detected above this) |
| 24 Jun 2024, 12:57 | <0.01 | below 0.01 mg/l (not detected above this) |
Conductivity
at 25 °C · code 0077 · µS/cm
417 µS/cm
Sampled 23 Jul 2026, 2 months ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 23 Jul 2026, 09:46 | 417 | 417 µS/cm |
| 15 Jun 2026, 09:14 | 398 | 398 µS/cm |
| 7 May 2026, 09:53 | 416 | 416 µS/cm |
| 9 Apr 2026, 12:20 | 422 | 422 µS/cm |
| 13 Mar 2026, 09:29 | 390 | 390 µS/cm |
| 6 Feb 2026, 09:48 | 337 | 337 µS/cm |
| 9 Jan 2026, 10:36 | 460 | 460 µS/cm |
| 11 Dec 2025, 10:49 | 448 | 448 µS/cm |
| 12 Nov 2025, 10:43 | 429 | 429 µS/cm |
| 8 Oct 2025, 11:44 | 420 | 420 µS/cm |
| 17 Sep 2025, 10:50 | 413 | 413 µS/cm |
| 22 Aug 2025, 10:52 | 400 | 400 µS/cm |
| 22 Jul 2025, 09:01 | 399 | 399 µS/cm |
| 19 Jun 2025, 10:58 | 400 | 400 µS/cm |
| 28 May 2025, 12:56 | 400 | 400 µS/cm |
| 22 Apr 2025, 11:04 | 416 | 416 µS/cm |
| 5 Mar 2025, 11:17 | 386 | 386 µS/cm |
| 6 Feb 2025, 09:26 | 391 | 391 µS/cm |
| 9 Jan 2025, 10:49 | 374 | 374 µS/cm |
| 10 Dec 2024, 10:15 | 387 | 387 µS/cm |
| 7 Nov 2024, 09:38 | 415 | 415 µS/cm |
| 9 Oct 2024, 09:37 | 378 | 378 µS/cm |
| 13 Sep 2024, 08:57 | 392 | 392 µS/cm |
| 22 Aug 2024, 11:28 | 384 | 384 µS/cm |
| 23 Jul 2024, 11:47 | 386 | 386 µS/cm |
| 24 Jun 2024, 12:57 | 394 | 394 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 | 26 | Jun 2024 – Jul 2026 | 83.5% 23 Jul 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 26 | Jun 2024 – Jul 2026 | 7.7 mg/l 23 Jul 2026 |
| Temperature of Water 0076 | River water | 26 | Jun 2024 – Jul 2026 | 19.2 °C 23 Jul 2026 |
| pH 0061 | River water | 26 | Jun 2024 – Jul 2026 | 7.46 23 Jul 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 26 | Jun 2024 – Jul 2026 | below 0.03 mg/l 23 Jul 2026 |
| Nitrate as N 0117 | River water | 26 | Jun 2024 – Jul 2026 | 0.506 mg/l 23 Jul 2026 |
| Orthophosphate, reactive as P 0180 | River water | 25 | Jun 2024 – Jul 2026 | 0.013 mg/l 23 Jul 2026 |
| Conductivity at 25 C 0077 | River water | 26 | Jun 2024 – Jul 2026 | 417 µS/cm 23 Jul 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 25 | Jun 2024 – Jul 2026 | 62 mg/l 23 Jul 2026 |
| Ammonia un-ionised as N 0119 | River water | 26 | Jun 2024 – Jul 2026 | below 0.00032 mg/l 23 Jul 2026 |
| BOD : 5 Day ATU 0085 | River water | 20 | Jun 2024 – Mar 2026 | below 3 mg/l 13 Mar 2026 |
| Nitrite as N 0118 | River water | 26 | Jun 2024 – Jul 2026 | below 0.004 mg/l 23 Jul 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 26 | Jun 2024 – Jul 2026 | 0.51 mg/l 23 Jul 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.