Grendon Brook Grendon Road Bridge
EA name: GRENDON BK.GRENDON RD.BR.
Environment Agency sampling point AN-GREN040G · 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
- 4 Sep 2026, 11:0827 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 28 since 3 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 488112, 260870As published, to the nearest 1 m. Open in a map
- River, by its own name
- Grendon Brook
- River, by the map
- Grendon BrookPlaced on the river its name gives, 7 m from the line.
- Next gauge downstream
- Islip Sluice On the River Nene · 31 km along the river (the path rests on a repair to the map)
- Why it was sampled
- Environmental monitoring statutory (EU directives) (28 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
71%
Sampled 4 Sep 2026, 27 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 11:08 | 71 | 71% |
| 3 Aug 2026, 12:56 | 47.3 | 47.3% |
| 3 Jul 2026, 11:39 | 70.2 | 70.2% |
| 3 Jun 2026, 12:58 | 83.9 | 83.9% |
| 22 May 2026, 09:50 | 71.5 | 71.5% |
| 10 Apr 2026, 10:00 | 95.1 | 95.1% |
| 3 Mar 2026, 12:21 | 99.7 | 99.7% |
| 13 Feb 2026, 11:04 | 96.1 | 96.1% |
| 6 Jan 2026, 12:21 | 97.8 | 97.8% |
| 5 Dec 2025, 11:45 | 96.7 | 96.7% |
| 7 Nov 2025, 15:21 | 74.3 | 74.3% |
| 17 Oct 2025, 10:22 | 77.4 | 77.4% |
| 12 Sep 2025, 15:31 | 77.6 | 77.6% |
| 7 Aug 2025, 10:50 | 76.8 | 76.8% |
| 2 Jul 2025, 11:03 | 56.1 | 56.1% |
| 4 Jun 2025, 10:57 | 63 | 63% |
| 8 May 2025, 10:31 | 93.3 | 93.3% |
| 22 Apr 2025, 14:28 | 132.4 | 132.4% |
| 10 Mar 2025, 09:52 | 96.4 | 96.4% |
| 7 Feb 2025, 11:49 | 100.1 | 100.1% |
| 13 Jan 2025, 10:47 | 96.3 | 96.3% |
| 3 Dec 2024, 12:02 | 95.3 | 95.3% |
| 1 Nov 2024, 12:58 | 96.2 | 96.2% |
| 14 Oct 2024, 10:47 | 91.9 | 91.9% |
| 2 Sep 2024, 12:18 | 69.5 | 69.5% |
| 2 Aug 2024, 12:27 | 72.8 | 72.8% |
| 2 Jul 2024, 12:10 | 86.4 | 86.4% |
| 3 Jun 2024, 10:51 | 95.5 | 95.5% |
Dissolved oxygen
as O2 · code 9924 · mg/l
6.82 mg/l
Sampled 4 Sep 2026, 27 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 11:08 | 6.82 | 6.82 mg/l |
| 3 Aug 2026, 12:56 | 4.6 | 4.6 mg/l |
| 3 Jul 2026, 11:39 | 6.8 | 6.8 mg/l |
| 3 Jun 2026, 12:58 | 8.44 | 8.44 mg/l |
| 22 May 2026, 09:50 | 7.21 | 7.21 mg/l |
| 10 Apr 2026, 10:00 | 11.1 | 11.1 mg/l |
| 3 Mar 2026, 12:21 | 11.5 | 11.5 mg/l |
| 13 Feb 2026, 11:04 | 11.6 | 11.6 mg/l |
| 6 Jan 2026, 12:21 | 13.7 | 13.7 mg/l |
| 5 Dec 2025, 11:45 | 11.8 | 11.8 mg/l |
| 7 Nov 2025, 15:21 | 7.92 | 7.92 mg/l |
| 17 Oct 2025, 10:22 | 8.38 | 8.38 mg/l |
| 12 Sep 2025, 15:31 | 8.1 | 8.1 mg/l |
| 7 Aug 2025, 10:50 | 7.58 | 7.58 mg/l |
| 2 Jul 2025, 11:03 | 5.21 | 5.21 mg/l |
| 4 Jun 2025, 10:57 | 6.56 | 6.56 mg/l |
| 8 May 2025, 10:31 | 10.5 | 10.5 mg/l |
| 22 Apr 2025, 14:28 | 14.4 | 14.4 mg/l |
| 10 Mar 2025, 09:52 | 11.5 | 11.5 mg/l |
| 7 Feb 2025, 11:49 | 12.7 | 12.7 mg/l |
| 13 Jan 2025, 10:47 | 12.2 | 12.2 mg/l |
| 3 Dec 2024, 12:02 | 11.2 | 11.2 mg/l |
| 1 Nov 2024, 12:58 | 10.5 | 10.5 mg/l |
| 14 Oct 2024, 10:47 | 10.3 | 10.3 mg/l |
| 2 Sep 2024, 12:18 | 6.76 | 6.76 mg/l |
| 2 Aug 2024, 12:27 | 6.85 | 6.85 mg/l |
| 2 Jul 2024, 12:10 | 8.88 | 8.88 mg/l |
| 3 Jun 2024, 10:51 | 9.9 | 9.9 mg/l |
Water temperature
code 0076 · °C
17.2 °C
Sampled 4 Sep 2026, 27 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 11:08 | 17.2 | 17.2 °C |
| 3 Aug 2026, 12:56 | 16.6 | 16.6 °C |
| 3 Jul 2026, 11:39 | 16.8 | 16.8 °C |
| 3 Jun 2026, 12:58 | 15 | 15 °C |
| 22 May 2026, 09:50 | 14.9 | 14.9 °C |
| 10 Apr 2026, 10:00 | 8.6 | 8.6 °C |
| 3 Mar 2026, 12:21 | 8.9 | 8.9 °C |
| 13 Feb 2026, 11:04 | 7.2 | 7.2 °C |
| 6 Jan 2026, 12:21 | 1.5 | 1.5 °C |
| 5 Dec 2025, 11:45 | 6.6 | 6.6 °C |
| 7 Nov 2025, 15:21 | 12.4 | 12.4 °C |
| 17 Oct 2025, 10:22 | 11.7 | 11.7 °C |
| 12 Sep 2025, 15:31 | 13.3 | 13.3 °C |
| 7 Aug 2025, 10:50 | 15.9 | 15.9 °C |
| 2 Jul 2025, 11:03 | 18.8 | 18.8 °C |
| 4 Jun 2025, 10:57 | 13.4 | 13.4 °C |
| 8 May 2025, 10:31 | 10.1 | 10.1 °C |
| 22 Apr 2025, 14:28 | 11.6 | 11.6 °C |
| 10 Mar 2025, 09:52 | 7.5 | 7.5 °C |
| 7 Feb 2025, 11:49 | 5.1 | 5.1 °C |
| 13 Jan 2025, 10:47 | 5.2 | 5.2 °C |
| 3 Dec 2024, 12:02 | 8.4 | 8.4 °C |
| 1 Nov 2024, 12:58 | 11.2 | 11.2 °C |
| 14 Oct 2024, 10:47 | 10.4 | 10.4 °C |
| 2 Sep 2024, 12:18 | 16.6 | 16.6 °C |
| 2 Aug 2024, 12:27 | 18.2 | 18.2 °C |
| 2 Jul 2024, 12:10 | 14 | 14 °C |
| 3 Jun 2024, 10:51 | 13.6 | 13.6 °C |
pH
code 0061
7.71
Sampled 4 Sep 2026, 27 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 11:08 | 7.71 | 7.71 |
| 3 Aug 2026, 12:56 | 7.65 | 7.65 |
| 3 Jul 2026, 11:39 | 7.88 | 7.88 |
| 3 Jun 2026, 12:58 | 7.95 | 7.95 |
| 22 May 2026, 09:50 | 8.05 | 8.05 |
| 10 Apr 2026, 10:00 | 8.52 | 8.52 |
| 3 Mar 2026, 12:21 | 8.14 | 8.14 |
| 13 Feb 2026, 11:04 | 8.1 | 8.1 |
| 6 Jan 2026, 12:21 | 8.41 | 8.41 |
| 5 Dec 2025, 11:45 | 8.21 | 8.21 |
| 7 Nov 2025, 15:21 | 8.01 | 8.01 |
| 17 Oct 2025, 10:22 | 7.86 | 7.86 |
| 12 Sep 2025, 15:31 | 8.05 | 8.05 |
| 7 Aug 2025, 10:50 | 8.01 | 8.01 |
| 2 Jul 2025, 11:03 | 7.81 | 7.81 |
| 4 Jun 2025, 10:57 | 7.87 | 7.87 |
| 8 May 2025, 10:31 | 8.27 | 8.27 |
| 22 Apr 2025, 14:28 | 8.5 | 8.5 |
| 10 Mar 2025, 09:52 | 8.17 | 8.17 |
| 7 Feb 2025, 11:49 | 8.27 | 8.27 |
| 13 Jan 2025, 10:47 | 8.23 | 8.23 |
| 3 Dec 2024, 12:02 | 8.15 | 8.15 |
| 1 Nov 2024, 12:58 | 8.16 | 8.16 |
| 14 Oct 2024, 10:47 | 8.05 | 8.05 |
| 2 Sep 2024, 12:18 | 7.93 | 7.93 |
| 2 Aug 2024, 12:27 | 7.92 | 7.92 |
| 2 Jul 2024, 12:10 | 8.14 | 8.14 |
| 3 Jun 2024, 10:51 | 8.22 | 8.22 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 4 Sep 2026, 27 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 11:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Aug 2026, 12:56 | 0.29 | 0.29 mg/l |
| 3 Jul 2026, 11:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Jun 2026, 12:58 | 0.089 | 0.089 mg/l |
| 22 May 2026, 09:50 | 0.11 | 0.11 mg/l |
| 10 Apr 2026, 10:00 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Mar 2026, 12:21 | 0.051 | 0.051 mg/l |
| 13 Feb 2026, 11:04 | 0.039 | 0.039 mg/l |
| 6 Jan 2026, 12:21 | 0.45 | 0.45 mg/l |
| 5 Dec 2025, 11:45 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Nov 2025, 15:21 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Oct 2025, 10:22 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Sep 2025, 15:31 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Aug 2025, 10:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Jul 2025, 11:03 | 0.051 | 0.051 mg/l |
| 4 Jun 2025, 10:57 | 0.14 | 0.14 mg/l |
| 8 May 2025, 10:31 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Mar 2025, 09:52 | 0.038 | 0.038 mg/l |
| 7 Feb 2025, 11:49 | 0.087 | 0.087 mg/l |
| 13 Jan 2025, 10:47 | 0.26 | 0.26 mg/l |
| 3 Dec 2024, 12:02 | 0.052 | 0.052 mg/l |
| 1 Nov 2024, 12:58 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Oct 2024, 10:47 | 0.16 | 0.16 mg/l |
| 2 Sep 2024, 12:18 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Aug 2024, 12:27 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Jul 2024, 12:10 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Jun 2024, 10:51 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
9.97 mg/l
Sampled 4 Sep 2026, 27 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 11:08 | 9.97 | 9.97 mg/l |
| 3 Aug 2026, 12:56 | 8.47 | 8.47 mg/l |
| 3 Jul 2026, 11:39 | 9.95 | 9.95 mg/l |
| 3 Jun 2026, 12:58 | 6.11 | 6.11 mg/l |
| 22 May 2026, 09:50 | 7.25 | 7.25 mg/l |
| 10 Apr 2026, 10:00 | 9.45 | 9.45 mg/l |
| 3 Mar 2026, 12:21 | 9.96 | 9.96 mg/l |
| 13 Feb 2026, 11:04 | 12 | 12 mg/l |
| 6 Jan 2026, 12:21 | 13.8 | 13.8 mg/l |
| 5 Dec 2025, 11:45 | 28 | 28 mg/l |
| 7 Nov 2025, 15:21 | 8.47 | 8.47 mg/l |
| 17 Oct 2025, 10:22 | 11 | 11 mg/l |
| 12 Sep 2025, 15:31 | 11 | 11 mg/l |
| 7 Aug 2025, 10:50 | 11 | 11 mg/l |
| 2 Jul 2025, 11:03 | 8.41 | 8.41 mg/l |
| 4 Jun 2025, 10:57 | 9.24 | 9.24 mg/l |
| 8 May 2025, 10:31 | 8.76 | 8.76 mg/l |
| 10 Mar 2025, 09:52 | 10.9 | 10.9 mg/l |
| 7 Feb 2025, 11:49 | 9.94 | 9.94 mg/l |
| 13 Jan 2025, 10:47 | 9.65 | 9.65 mg/l |
| 3 Dec 2024, 12:02 | 9.56 | 9.56 mg/l |
| 1 Nov 2024, 12:58 | 9.53 | 9.53 mg/l |
| 14 Oct 2024, 10:47 | 9.04 | 9.04 mg/l |
| 2 Sep 2024, 12:18 | 9.58 | 9.58 mg/l |
| 2 Aug 2024, 12:27 | 11 | 11 mg/l |
| 2 Jul 2024, 12:10 | 12 | 12 mg/l |
| 3 Jun 2024, 10:51 | 12 | 12 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
2.2 mg/l
Sampled 4 Sep 2026, 27 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 11:08 | 2.2 | 2.2 mg/l |
| 3 Aug 2026, 12:56 | 2.4 | 2.4 mg/l |
| 3 Jul 2026, 11:39 | 2 | 2 mg/l |
| 3 Jun 2026, 12:58 | 1 | 1 mg/l |
| 22 May 2026, 09:50 | 0.85 | 0.85 mg/l |
| 10 Apr 2026, 10:00 | 0.7 | 0.7 mg/l |
| 3 Mar 2026, 12:21 | 0.17 | 0.17 mg/l |
| 13 Feb 2026, 11:04 | 0.14 | 0.14 mg/l |
| 6 Jan 2026, 12:21 | 0.57 | 0.57 mg/l |
| 5 Dec 2025, 11:45 | 0.19 | 0.19 mg/l |
| 7 Nov 2025, 15:21 | 1.7 | 1.7 mg/l |
| 17 Oct 2025, 10:22 | 2.1 | 2.1 mg/l |
| 12 Sep 2025, 15:31 | 2.1 | 2.1 mg/l |
| 7 Aug 2025, 10:50 | 2.2 | 2.2 mg/l |
| 2 Jul 2025, 11:03 | 2.1 | 2.1 mg/l |
| 4 Jun 2025, 10:57 | 1.6 | 1.6 mg/l |
| 8 May 2025, 10:31 | 0.84 | 0.84 mg/l |
| 10 Mar 2025, 09:52 | 0.42 | 0.42 mg/l |
| 7 Feb 2025, 11:49 | 0.21 | 0.21 mg/l |
| 13 Jan 2025, 10:47 | 0.23 | 0.23 mg/l |
| 1 Nov 2024, 12:58 | 0.33 | 0.33 mg/l |
| 14 Oct 2024, 10:47 | 0.19 | 0.19 mg/l |
| 2 Sep 2024, 12:18 | 1.3 | 1.3 mg/l |
| 2 Aug 2024, 12:27 | 1.5 | 1.5 mg/l |
| 2 Jul 2024, 12:10 | 1.2 | 1.2 mg/l |
| 3 Jun 2024, 10:51 | 0.64 | 0.64 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
451 µS/cm
Sampled 4 Sep 2026, 27 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 11:08 | 451 | 451 µS/cm |
| 3 Aug 2026, 12:56 | 1000 | 1000 µS/cm |
| 3 Jul 2026, 11:39 | 981 | 981 µS/cm |
| 3 Jun 2026, 12:58 | 788 | 788 µS/cm |
| 22 May 2026, 09:50 | 900 | 900 µS/cm |
| 10 Apr 2026, 10:00 | 891 | 891 µS/cm |
| 3 Mar 2026, 12:21 | 719 | 719 µS/cm |
| 13 Feb 2026, 11:04 | 683 | 683 µS/cm |
| 6 Jan 2026, 12:21 | 901 | 901 µS/cm |
| 5 Dec 2025, 11:45 | 783 | 783 µS/cm |
| 7 Nov 2025, 15:21 | 944 | 944 µS/cm |
| 17 Oct 2025, 10:22 | 966 | 966 µS/cm |
| 12 Sep 2025, 15:31 | 926 | 926 µS/cm |
| 7 Aug 2025, 10:50 | 959 | 959 µS/cm |
| 2 Jul 2025, 11:03 | 958 | 958 µS/cm |
| 4 Jun 2025, 10:57 | 889 | 889 µS/cm |
| 8 May 2025, 10:31 | 908 | 908 µS/cm |
| 22 Apr 2025, 14:28 | 906 | 906 µS/cm |
| 10 Mar 2025, 09:52 | 844 | 844 µS/cm |
| 7 Feb 2025, 11:49 | 796 | 796 µS/cm |
| 13 Jan 2025, 10:47 | 794 | 794 µS/cm |
| 3 Dec 2024, 12:02 | 749 | 749 µS/cm |
| 1 Nov 2024, 12:58 | 845 | 845 µS/cm |
| 14 Oct 2024, 10:47 | 758 | 758 µS/cm |
| 2 Sep 2024, 12:18 | 951 | 951 µS/cm |
| 2 Aug 2024, 12:27 | 956 | 956 µS/cm |
| 2 Jul 2024, 12:10 | 949 | 949 µS/cm |
| 3 Jun 2024, 10:51 | 873 | 873 µS/cm |
Everything measured here
12 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 12 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 28 | Jun 2024 – Sep 2026 | 71% 4 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 28 | Jun 2024 – Sep 2026 | 6.82 mg/l 4 Sep 2026 |
| Temperature of Water 0076 | River water | 28 | Jun 2024 – Sep 2026 | 17.2 °C 4 Sep 2026 |
| pH 0061 | River water | 28 | Jun 2024 – Sep 2026 | 7.71 4 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 27 | Jun 2024 – Sep 2026 | below 0.03 mg/l 4 Sep 2026 |
| Nitrate as N 0117 | River water | 27 | Jun 2024 – Sep 2026 | 9.97 mg/l 4 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 26 | Jun 2024 – Sep 2026 | 2.2 mg/l 4 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 28 | Jun 2024 – Sep 2026 | 451 µS/cm 4 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 26 | Jun 2024 – Sep 2026 | 230 mg/l 4 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 27 | Jun 2024 – Sep 2026 | below 0.00048 mg/l 4 Sep 2026 |
| Nitrite as N 0118 | River water | 27 | Jun 2024 – Sep 2026 | 0.031 mg/l 4 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 27 | Jun 2024 – Sep 2026 | 10 mg/l 4 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.