Datchet Common Brook above Thames
EA name: DATCHET COMMON BROOK ABOVE THAMES
Environment Agency sampling point TH-PTHR0022 · 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
- 18 Aug 2026, 10:0744 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 22 since 6 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 499990, 175450As published, to the nearest 10 m. Open in a map
- River, by its own name
- Datchet Common Brook
- River, by the map
- Datchet Common BrookPlaced on the river its name gives, 5 m from the line.
- Next gauge downstream
- Old Windsor Lock On the River Thames · 0.9 km along the river
- Why it was sampled
- Environmental monitoring statutory (EU directives) (22 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
72.1%
Sampled 18 Aug 2026, 44 days ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 Aug 2026, 10:07 | 72.1 | 72.1% |
| 21 Jul 2026, 09:08 | 75.2 | 75.2% |
| 18 Jun 2026, 08:56 | 54.3 | 54.3% |
| 11 May 2026, 10:29 | 82 | 82% |
| 13 Apr 2026, 12:37 | 85.1 | 85.1% |
| 26 Mar 2026, 10:15 | 85.4 | 85.4% |
| 17 Feb 2026, 12:55 | 79.9 | 79.9% |
| 27 Jan 2026, 12:37 | 80.2 | 80.2% |
| 11 Dec 2025, 10:47 | 65.3 | 65.3% |
| 26 Nov 2025, 11:25 | 76 | 76% |
| 24 Oct 2025, 11:04 | 69 | 69% |
| 3 Apr 2025, 12:50 | 86.3 | 86.3% |
| 10 Mar 2025, 12:30 | 90.8 | 90.8% |
| 13 Feb 2025, 11:45 | 87.2 | 87.2% |
| 21 Jan 2025, 13:58 | 84 | 84% |
| 16 Dec 2024, 12:07 | 79.3 | 79.3% |
| 20 Nov 2024, 11:48 | 73.6 | 73.6% |
| 16 Oct 2024, 11:41 | 65.1 | 65.1% |
| 13 Sep 2024, 11:02 | 80.1 | 80.1% |
| 7 Aug 2024, 11:02 | 54.7 | 54.7% |
| 3 Jul 2024, 09:51 | 75.6 | 75.6% |
| 6 Jun 2024, 11:42 | 79.8 | 79.8% |
Dissolved oxygen
as O2 · code 9924 · mg/l
6.64 mg/l
Sampled 18 Aug 2026, 44 days ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 Aug 2026, 10:07 | 6.64 | 6.64 mg/l |
| 21 Jul 2026, 09:08 | 7.28 | 7.28 mg/l |
| 18 Jun 2026, 08:56 | 5.16 | 5.16 mg/l |
| 11 May 2026, 10:29 | 9.13 | 9.13 mg/l |
| 13 Apr 2026, 12:37 | 9.59 | 9.59 mg/l |
| 26 Mar 2026, 10:15 | 9.98 | 9.98 mg/l |
| 17 Feb 2026, 12:55 | 9.42 | 9.42 mg/l |
| 27 Jan 2026, 12:37 | 9.12 | 9.12 mg/l |
| 11 Dec 2025, 10:47 | 7.45 | 7.45 mg/l |
| 26 Nov 2025, 11:25 | 9.4 | 9.4 mg/l |
| 24 Oct 2025, 11:04 | 7.7 | 7.7 mg/l |
| 3 Apr 2025, 12:50 | 9.28 | 9.28 mg/l |
| 10 Mar 2025, 12:30 | 10 | 10 mg/l |
| 13 Feb 2025, 11:45 | 10.4 | 10.4 mg/l |
| 21 Jan 2025, 13:58 | 9.76 | 9.76 mg/l |
| 16 Dec 2024, 12:07 | 8.77 | 8.77 mg/l |
| 20 Nov 2024, 11:48 | 8.81 | 8.81 mg/l |
| 16 Oct 2024, 11:41 | 6.62 | 6.62 mg/l |
| 13 Sep 2024, 11:02 | 8.69 | 8.69 mg/l |
| 7 Aug 2024, 11:02 | 5.36 | 5.36 mg/l |
| 3 Jul 2024, 09:51 | 7.72 | 7.72 mg/l |
| 6 Jun 2024, 11:42 | 8.29 | 8.29 mg/l |
Water temperature
code 0076 · °C
19.2 °C
Sampled 18 Aug 2026, 44 days ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 Aug 2026, 10:07 | 19.2 | 19.2 °C |
| 21 Jul 2026, 09:08 | 16.8 | 16.8 °C |
| 18 Jun 2026, 08:56 | 17.7 | 17.7 °C |
| 11 May 2026, 10:29 | 10.5 | 10.5 °C |
| 13 Apr 2026, 12:37 | 10 | 10 °C |
| 26 Mar 2026, 10:15 | 8.5 | 8.5 °C |
| 17 Feb 2026, 12:55 | 8.1 | 8.1 °C |
| 27 Jan 2026, 12:37 | 9.6 | 9.6 °C |
| 11 Dec 2025, 10:47 | 9.5 | 9.5 °C |
| 26 Nov 2025, 11:25 | 6.2 | 6.2 °C |
| 24 Oct 2025, 11:04 | 10.4 | 10.4 °C |
| 3 Apr 2025, 12:50 | 12 | 12 °C |
| 10 Mar 2025, 12:30 | 10.9 | 10.9 °C |
| 13 Feb 2025, 11:45 | 7.8 | 7.8 °C |
| 21 Jan 2025, 13:58 | 8.7 | 8.7 °C |
| 16 Dec 2024, 12:07 | 10.8 | 10.8 °C |
| 20 Nov 2024, 11:48 | 7.5 | 7.5 °C |
| 16 Oct 2024, 11:41 | 14.5 | 14.5 °C |
| 13 Sep 2024, 11:02 | 11.6 | 11.6 °C |
| 7 Aug 2024, 11:02 | 16.2 | 16.2 °C |
| 3 Jul 2024, 09:51 | 14.3 | 14.3 °C |
| 6 Jun 2024, 11:42 | 13.5 | 13.5 °C |
pH
code 0061
7.88
Sampled 18 Aug 2026, 44 days ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 Aug 2026, 10:07 | 7.88 | 7.88 |
| 21 Jul 2026, 09:08 | 7.9 | 7.9 |
| 18 Jun 2026, 08:56 | 7.8 | 7.8 |
| 11 May 2026, 10:29 | 7.85 | 7.85 |
| 13 Apr 2026, 12:37 | 7.83 | 7.83 |
| 26 Mar 2026, 10:15 | 7.84 | 7.84 |
| 17 Feb 2026, 12:55 | 7.54 | 7.54 |
| 27 Jan 2026, 12:37 | 7.48 | 7.48 |
| 11 Dec 2025, 10:47 | 7.92 | 7.92 |
| 26 Nov 2025, 11:25 | 7.71 | 7.71 |
| 24 Oct 2025, 11:04 | 7.54 | 7.54 |
| 3 Apr 2025, 12:50 | 7.87 | 7.87 |
| 10 Mar 2025, 12:30 | 7.83 | 7.83 |
| 13 Feb 2025, 11:45 | 7.73 | 7.73 |
| 21 Jan 2025, 13:58 | 7.66 | 7.66 |
| 16 Dec 2024, 12:07 | 7.69 | 7.69 |
| 20 Nov 2024, 11:48 | 7.68 | 7.68 |
| 16 Oct 2024, 11:41 | 7.44 | 7.44 |
| 13 Sep 2024, 11:02 | 7.9 | 7.9 |
| 7 Aug 2024, 11:02 | 7.57 | 7.57 |
| 3 Jul 2024, 09:51 | 8.04 | 8.04 |
| 6 Jun 2024, 11:42 | 7.81 | 7.81 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 18 Aug 2026, 44 days ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 Aug 2026, 10:07 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Jul 2026, 09:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Jun 2026, 08:56 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 May 2026, 10:29 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Apr 2026, 12:37 | <0.03 | below 0.03 mg/l (not detected above this) |
| 26 Mar 2026, 10:15 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Feb 2026, 12:55 | 0.078 | 0.078 mg/l |
| 27 Jan 2026, 12:37 | 0.1 | 0.1 mg/l |
| 11 Dec 2025, 10:47 | 0.034 | 0.034 mg/l |
| 26 Nov 2025, 11:25 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Oct 2025, 11:04 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Mar 2025, 12:30 | 0.033 | 0.033 mg/l |
| 13 Feb 2025, 11:45 | 0.047 | 0.047 mg/l |
| 21 Jan 2025, 13:58 | 0.05 | 0.05 mg/l |
| 16 Dec 2024, 12:07 | 0.042 | 0.042 mg/l |
| 20 Nov 2024, 11:48 | 0.042 | 0.042 mg/l |
| 16 Oct 2024, 11:41 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Sep 2024, 11:02 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Aug 2024, 11:02 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Jul 2024, 09:51 | 0.03 | 0.03 mg/l |
| 6 Jun 2024, 11:42 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
4.39 mg/l
Sampled 18 Aug 2026, 44 days ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 Aug 2026, 10:07 | 4.39 | 4.39 mg/l |
| 21 Jul 2026, 09:08 | 5.2 | 5.2 mg/l |
| 18 Jun 2026, 08:56 | 2.37 | 2.37 mg/l |
| 11 May 2026, 10:29 | 4.89 | 4.89 mg/l |
| 13 Apr 2026, 12:37 | 4.09 | 4.09 mg/l |
| 26 Mar 2026, 10:15 | 4.18 | 4.18 mg/l |
| 17 Feb 2026, 12:55 | 3.76 | 3.76 mg/l |
| 27 Jan 2026, 12:37 | 3.45 | 3.45 mg/l |
| 11 Dec 2025, 10:47 | 3.77 | 3.77 mg/l |
| 26 Nov 2025, 11:25 | 4.09 | 4.09 mg/l |
| 24 Oct 2025, 11:04 | 1.7 | 1.7 mg/l |
| 10 Mar 2025, 12:30 | 3.88 | 3.88 mg/l |
| 13 Feb 2025, 11:45 | 3.28 | 3.28 mg/l |
| 21 Jan 2025, 13:58 | 3.37 | 3.37 mg/l |
| 16 Dec 2024, 12:07 | 3.27 | 3.27 mg/l |
| 20 Nov 2024, 11:48 | 2.58 | 2.58 mg/l |
| 16 Oct 2024, 11:41 | 3.47 | 3.47 mg/l |
| 13 Sep 2024, 11:02 | 5.39 | 5.39 mg/l |
| 7 Aug 2024, 11:02 | 2.98 | 2.98 mg/l |
| 3 Jul 2024, 09:51 | 4.29 | 4.29 mg/l |
| 6 Jun 2024, 11:42 | 3.89 | 3.89 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.25 mg/l
Sampled 18 Aug 2026, 44 days ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 Aug 2026, 10:07 | 0.25 | 0.25 mg/l |
| 21 Jul 2026, 09:08 | 0.27 | 0.27 mg/l |
| 18 Jun 2026, 08:56 | 0.24 | 0.24 mg/l |
| 11 May 2026, 10:29 | 0.21 | 0.21 mg/l |
| 13 Apr 2026, 12:37 | 0.2 | 0.2 mg/l |
| 26 Mar 2026, 10:15 | 0.2 | 0.2 mg/l |
| 17 Feb 2026, 12:55 | 0.17 | 0.17 mg/l |
| 27 Jan 2026, 12:37 | 0.21 | 0.21 mg/l |
| 11 Dec 2025, 10:47 | 0.24 | 0.24 mg/l |
| 26 Nov 2025, 11:25 | 0.24 | 0.24 mg/l |
| 24 Oct 2025, 11:04 | 0.24 | 0.24 mg/l |
| 10 Mar 2025, 12:30 | 0.19 | 0.19 mg/l |
| 13 Feb 2025, 11:45 | 0.15 | 0.15 mg/l |
| 21 Jan 2025, 13:58 | 0.17 | 0.17 mg/l |
| 16 Dec 2024, 12:07 | 0.18 | 0.18 mg/l |
| 20 Nov 2024, 11:48 | 0.23 | 0.23 mg/l |
| 16 Oct 2024, 11:41 | 0.21 | 0.21 mg/l |
| 13 Sep 2024, 11:02 | 0.3 | 0.3 mg/l |
| 7 Aug 2024, 11:02 | 0.18 | 0.18 mg/l |
| 3 Jul 2024, 09:51 | 0.21 | 0.21 mg/l |
| 6 Jun 2024, 11:42 | 0.19 | 0.19 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
748 µS/cm
Sampled 18 Aug 2026, 44 days ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 Aug 2026, 10:07 | 748 | 748 µS/cm |
| 21 Jul 2026, 09:08 | 761 | 761 µS/cm |
| 18 Jun 2026, 08:56 | 758 | 758 µS/cm |
| 11 May 2026, 10:29 | 772 | 772 µS/cm |
| 13 Apr 2026, 12:37 | 777 | 777 µS/cm |
| 26 Mar 2026, 10:15 | 785 | 785 µS/cm |
| 17 Feb 2026, 12:55 | 757 | 757 µS/cm |
| 27 Jan 2026, 12:37 | 667 | 667 µS/cm |
| 11 Dec 2025, 10:47 | 785 | 785 µS/cm |
| 26 Nov 2025, 11:25 | 757 | 757 µS/cm |
| 24 Oct 2025, 11:04 | 420 | 420 µS/cm |
| 3 Apr 2025, 12:50 | 832 | 832 µS/cm |
| 10 Mar 2025, 12:30 | 757 | 757 µS/cm |
| 13 Feb 2025, 11:45 | 758 | 758 µS/cm |
| 21 Jan 2025, 13:58 | 770 | 770 µS/cm |
| 16 Dec 2024, 12:07 | 764 | 764 µS/cm |
| 20 Nov 2024, 11:48 | 623 | 623 µS/cm |
| 16 Oct 2024, 11:41 | 767 | 767 µS/cm |
| 13 Sep 2024, 11:02 | 774 | 774 µS/cm |
| 7 Aug 2024, 11:02 | 641 | 641 µS/cm |
| 3 Jul 2024, 09:51 | 798 | 798 µS/cm |
| 6 Jun 2024, 11:42 | 760 | 760 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 | 22 | Jun 2024 – Aug 2026 | 72.1% 18 Aug 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 22 | Jun 2024 – Aug 2026 | 6.64 mg/l 18 Aug 2026 |
| Temperature of Water 0076 | River water | 22 | Jun 2024 – Aug 2026 | 19.2 °C 18 Aug 2026 |
| pH 0061 | River water | 22 | Jun 2024 – Aug 2026 | 7.88 18 Aug 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 21 | Jun 2024 – Aug 2026 | below 0.03 mg/l 18 Aug 2026 |
| Nitrate as N 0117 | River water | 21 | Jun 2024 – Aug 2026 | 4.39 mg/l 18 Aug 2026 |
| Orthophosphate, reactive as P 0180 | River water | 21 | Jun 2024 – Aug 2026 | 0.25 mg/l 18 Aug 2026 |
| Conductivity at 25 C 0077 | River water | 22 | Jun 2024 – Aug 2026 | 748 µS/cm 18 Aug 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 21 | Jun 2024 – Aug 2026 | 230 mg/l 18 Aug 2026 |
| Ammonia un-ionised as N 0119 | River water | 21 | Jun 2024 – Aug 2026 | below 0.00082 mg/l 18 Aug 2026 |
| BOD : 5 Day ATU 0085 | River water | 21 | Jun 2024 – Aug 2026 | 1.7 mg/l 18 Aug 2026 |
| Nitrite as N 0118 | River water | 21 | Jun 2024 – Aug 2026 | 0.0055 mg/l 18 Aug 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 21 | Jun 2024 – Aug 2026 | 4.4 mg/l 18 Aug 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.