Grendon Brook downstream of Yardley Hastings WRC
EA name: GRENDON BROOK D/S YARDLEY HASTINGS WRC (also listed as “GRENDON BROOK DOWNSTREAM YARDLEY HASTINGS WRC”)
Environment Agency sampling point AN-GREN020S · 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, 11:2527 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 28 since 12 Jun 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 487444, 258517As 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, 0 m from the line.
- Next gauge downstream
- Islip Sluice On the River Nene · 36 km along the river (the path rests on a repair to the map)
- Why it was sampled
- Monitoring (national agency policy) (28 samples)
2 visits found no water to sample (recorded as “No flow”).
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
87.8%
Sampled 3 Aug 2026, 59 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Aug 2026, 12:32 | 87.8 | 87.8% |
| 3 Jun 2026, 12:34 | 74 | 74% |
| 13 May 2026, 12:08 | 97.9 | 97.9% |
| 10 Apr 2026, 09:41 | 89.4 | 89.4% |
| 3 Mar 2026, 11:56 | 98.5 | 98.5% |
| 12 Feb 2026, 12:01 | 98 | 98% |
| 15 Jan 2026, 12:44 | 96.1 | 96.1% |
| 5 Dec 2025, 10:59 | 97.4 | 97.4% |
| 7 Nov 2025, 14:59 | 62.6 | 62.6% |
| 7 Oct 2025, 11:32 | 82.1 | 82.1% |
| 12 Sep 2025, 15:09 | 75.7 | 75.7% |
| 7 Aug 2025, 11:29 | 83.3 | 83.3% |
| 2 Jul 2025, 10:52 | 81.6 | 81.6% |
| 11 Jun 2025, 10:31 | 91.5 | 91.5% |
| 8 May 2025, 10:13 | 92.7 | 92.7% |
| 22 Apr 2025, 14:11 | 108.5 | 108.5% |
| 4 Mar 2025, 10:28 | 101.9 | 101.9% |
| 7 Feb 2025, 12:22 | 100.2 | 100.2% |
| 13 Jan 2025, 10:58 | 95.2 | 95.2% |
| 3 Dec 2024, 11:23 | 95.1 | 95.1% |
| 1 Nov 2024, 12:12 | 86.1 | 86.1% |
| 14 Oct 2024, 10:27 | 91.5 | 91.5% |
| 2 Sep 2024, 11:38 | 84 | 84% |
| 2 Aug 2024, 12:04 | 87.6 | 87.6% |
| 2 Jul 2024, 11:57 | 92.9 | 92.9% |
| 12 Jun 2024, 12:41 | 96.9 | 96.9% |
Dissolved oxygen
as O2 · code 9924 · mg/l
8.48 mg/l
Sampled 3 Aug 2026, 59 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Aug 2026, 12:32 | 8.48 | 8.48 mg/l |
| 3 Jun 2026, 12:34 | 7.71 | 7.71 mg/l |
| 13 May 2026, 12:08 | 11 | 11 mg/l |
| 10 Apr 2026, 09:41 | 10.5 | 10.5 mg/l |
| 3 Mar 2026, 11:56 | 11.4 | 11.4 mg/l |
| 12 Feb 2026, 12:01 | 11.6 | 11.6 mg/l |
| 15 Jan 2026, 12:44 | 11.7 | 11.7 mg/l |
| 5 Dec 2025, 10:59 | 12.2 | 12.2 mg/l |
| 7 Nov 2025, 14:59 | 6.65 | 6.65 mg/l |
| 7 Oct 2025, 11:32 | 8.77 | 8.77 mg/l |
| 12 Sep 2025, 15:09 | 7.89 | 7.89 mg/l |
| 7 Aug 2025, 11:29 | 8.4 | 8.4 mg/l |
| 2 Jul 2025, 10:52 | 8.07 | 8.07 mg/l |
| 11 Jun 2025, 10:31 | 9.57 | 9.57 mg/l |
| 8 May 2025, 10:13 | 10.4 | 10.4 mg/l |
| 22 Apr 2025, 14:11 | 11.7 | 11.7 mg/l |
| 4 Mar 2025, 10:28 | 13.1 | 13.1 mg/l |
| 7 Feb 2025, 12:22 | 12.8 | 12.8 mg/l |
| 13 Jan 2025, 10:58 | 12.1 | 12.1 mg/l |
| 3 Dec 2024, 11:23 | 11.1 | 11.1 mg/l |
| 1 Nov 2024, 12:12 | 9.39 | 9.39 mg/l |
| 14 Oct 2024, 10:27 | 10.3 | 10.3 mg/l |
| 2 Sep 2024, 11:38 | 8.36 | 8.36 mg/l |
| 2 Aug 2024, 12:04 | 8.59 | 8.59 mg/l |
| 2 Jul 2024, 11:57 | 9.79 | 9.79 mg/l |
| 12 Jun 2024, 12:41 | 10.4 | 10.4 mg/l |
Water temperature
code 0076 · °C
16.9 °C
Sampled 3 Aug 2026, 59 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Aug 2026, 12:32 | 16.9 | 16.9 °C |
| 3 Jun 2026, 12:34 | 13.4 | 13.4 °C |
| 13 May 2026, 12:08 | 10.3 | 10.3 °C |
| 10 Apr 2026, 09:41 | 8.4 | 8.4 °C |
| 3 Mar 2026, 11:56 | 8.8 | 8.8 °C |
| 12 Feb 2026, 12:01 | 7.8 | 7.8 °C |
| 15 Jan 2026, 12:44 | 6.9 | 6.9 °C |
| 5 Dec 2025, 10:59 | 5.7 | 5.7 °C |
| 7 Nov 2025, 14:59 | 12.5 | 12.5 °C |
| 7 Oct 2025, 11:32 | 12.3 | 12.3 °C |
| 12 Sep 2025, 15:09 | 13.4 | 13.4 °C |
| 7 Aug 2025, 11:29 | 14.9 | 14.9 °C |
| 2 Jul 2025, 10:52 | 15.8 | 15.8 °C |
| 11 Jun 2025, 10:31 | 13.2 | 13.2 °C |
| 8 May 2025, 10:13 | 10.1 | 10.1 °C |
| 22 Apr 2025, 14:11 | 11.7 | 11.7 °C |
| 4 Mar 2025, 10:28 | 4.8 | 4.8 °C |
| 7 Feb 2025, 12:22 | 5 | 5 °C |
| 13 Jan 2025, 10:58 | 5.2 | 5.2 °C |
| 3 Dec 2024, 11:23 | 8.4 | 8.4 °C |
| 1 Nov 2024, 12:12 | 11.4 | 11.4 °C |
| 14 Oct 2024, 10:27 | 10.2 | 10.2 °C |
| 2 Sep 2024, 11:38 | 15.5 | 15.5 °C |
| 2 Aug 2024, 12:04 | 16.2 | 16.2 °C |
| 2 Jul 2024, 11:57 | 12.9 | 12.9 °C |
| 12 Jun 2024, 12:41 | 12.1 | 12.1 °C |
pH
code 0061
7.81
Sampled 3 Aug 2026, 59 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Aug 2026, 12:32 | 7.81 | 7.81 |
| 3 Jun 2026, 12:34 | 7.77 | 7.77 |
| 13 May 2026, 12:08 | 8.05 | 8.05 |
| 10 Apr 2026, 09:41 | 8.2 | 8.2 |
| 3 Mar 2026, 11:56 | 8.03 | 8.03 |
| 12 Feb 2026, 12:01 | 8.05 | 8.05 |
| 15 Jan 2026, 12:44 | 7.95 | 7.95 |
| 5 Dec 2025, 10:59 | 8.12 | 8.12 |
| 7 Nov 2025, 14:59 | 7.75 | 7.75 |
| 7 Oct 2025, 11:32 | 7.97 | 7.97 |
| 12 Sep 2025, 15:09 | 7.88 | 7.88 |
| 7 Aug 2025, 11:29 | 8.01 | 8.01 |
| 2 Jul 2025, 10:52 | 7.95 | 7.95 |
| 11 Jun 2025, 10:31 | 7.85 | 7.85 |
| 8 May 2025, 10:13 | 7.96 | 7.96 |
| 22 Apr 2025, 14:11 | 8.02 | 8.02 |
| 4 Mar 2025, 10:28 | 8.24 | 8.24 |
| 7 Feb 2025, 12:22 | 8.15 | 8.15 |
| 13 Jan 2025, 10:58 | 8.05 | 8.05 |
| 3 Dec 2024, 11:23 | 8.22 | 8.22 |
| 1 Nov 2024, 12:12 | 7.88 | 7.88 |
| 14 Oct 2024, 10:27 | 7.94 | 7.94 |
| 2 Sep 2024, 11:38 | 7.89 | 7.89 |
| 2 Aug 2024, 12:04 | 7.87 | 7.87 |
| 2 Jul 2024, 11:57 | 7.83 | 7.83 |
| 12 Jun 2024, 12:41 | 7.78 | 7.78 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 3 Aug 2026, 59 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Aug 2026, 12:32 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Jun 2026, 12:34 | 1.3 | 1.3 mg/l |
| 13 May 2026, 12:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Apr 2026, 09:41 | 0.14 | 0.14 mg/l |
| 3 Mar 2026, 11:56 | 0.082 | 0.082 mg/l |
| 12 Feb 2026, 12:01 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Jan 2026, 12:44 | 0.22 | 0.22 mg/l |
| 5 Dec 2025, 10:59 | 0.063 | 0.063 mg/l |
| 7 Nov 2025, 14:59 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Oct 2025, 11:32 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Sep 2025, 15:09 | 0.63 | 0.63 mg/l |
| 7 Aug 2025, 11:29 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Jul 2025, 10:52 | 0.039 | 0.039 mg/l |
| 11 Jun 2025, 10:31 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 May 2025, 10:13 | 0.16 | 0.16 mg/l |
| 22 Apr 2025, 14:11 | 1.7 | 1.7 mg/l |
| 4 Mar 2025, 10:28 | 0.17 | 0.17 mg/l |
| 7 Feb 2025, 12:22 | 0.36 | 0.36 mg/l |
| 13 Jan 2025, 10:58 | 0.37 | 0.37 mg/l |
| 3 Dec 2024, 11:23 | 0.097 | 0.097 mg/l |
| 1 Nov 2024, 12:12 | 0.031 | 0.031 mg/l |
| 14 Oct 2024, 10:27 | 0.056 | 0.056 mg/l |
| 2 Sep 2024, 11:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Aug 2024, 12:04 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Jul 2024, 11:57 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Jun 2024, 12:41 | 0.032 | 0.032 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
18 mg/l
Sampled 3 Aug 2026, 59 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Aug 2026, 12:32 | 18 | 18 mg/l |
| 3 Jun 2026, 12:34 | 8.68 | 8.68 mg/l |
| 13 May 2026, 12:08 | 8.36 | 8.36 mg/l |
| 10 Apr 2026, 09:41 | 11.9 | 11.9 mg/l |
| 3 Mar 2026, 11:56 | 9.26 | 9.26 mg/l |
| 12 Feb 2026, 12:01 | 11 | 11 mg/l |
| 15 Jan 2026, 12:44 | 17.9 | 17.9 mg/l |
| 5 Dec 2025, 10:59 | 31 | 31 mg/l |
| 7 Nov 2025, 14:59 | 15.9 | 15.9 mg/l |
| 7 Oct 2025, 11:32 | 12.9 | 12.9 mg/l |
| 12 Sep 2025, 15:09 | 15.8 | 15.8 mg/l |
| 7 Aug 2025, 11:29 | 15 | 15 mg/l |
| 2 Jul 2025, 10:52 | 14 | 14 mg/l |
| 11 Jun 2025, 10:31 | 13 | 13 mg/l |
| 8 May 2025, 10:13 | 12.8 | 12.8 mg/l |
| 22 Apr 2025, 14:11 | 9.6 | 9.6 mg/l |
| 4 Mar 2025, 10:28 | 8.45 | 8.45 mg/l |
| 7 Feb 2025, 12:22 | 8.55 | 8.55 mg/l |
| 13 Jan 2025, 10:58 | 8.35 | 8.35 mg/l |
| 3 Dec 2024, 11:23 | 8.18 | 8.18 mg/l |
| 1 Nov 2024, 12:12 | 7.37 | 7.37 mg/l |
| 14 Oct 2024, 10:27 | 8.15 | 8.15 mg/l |
| 2 Sep 2024, 11:38 | 17 | 17 mg/l |
| 2 Aug 2024, 12:04 | 16 | 16 mg/l |
| 2 Jul 2024, 11:57 | 15 | 15 mg/l |
| 12 Jun 2024, 12:41 | 11.9 | 11.9 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
3.2 mg/l
Sampled 3 Aug 2026, 59 days ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Aug 2026, 12:32 | 3.2 | 3.2 mg/l |
| 3 Jun 2026, 12:34 | 0.89 | 0.89 mg/l |
| 13 May 2026, 12:08 | 0.39 | 0.39 mg/l |
| 10 Apr 2026, 09:41 | 1.1 | 1.1 mg/l |
| 3 Mar 2026, 11:56 | 0.21 | 0.21 mg/l |
| 12 Feb 2026, 12:01 | 0.13 | 0.13 mg/l |
| 15 Jan 2026, 12:44 | 0.26 | 0.26 mg/l |
| 5 Dec 2025, 10:59 | 0.12 | 0.12 mg/l |
| 7 Nov 2025, 14:59 | 3.2 | 3.2 mg/l |
| 7 Oct 2025, 11:32 | 2 | 2 mg/l |
| 12 Sep 2025, 15:09 | 3.1 | 3.1 mg/l |
| 7 Aug 2025, 11:29 | 2.7 | 2.7 mg/l |
| 2 Jul 2025, 10:52 | 3.3 | 3.3 mg/l |
| 11 Jun 2025, 10:31 | 1.6 | 1.6 mg/l |
| 8 May 2025, 10:13 | 1.4 | 1.4 mg/l |
| 22 Apr 2025, 14:11 | 1.1 | 1.1 mg/l |
| 4 Mar 2025, 10:28 | 0.19 | 0.19 mg/l |
| 7 Feb 2025, 12:22 | 0.21 | 0.21 mg/l |
| 13 Jan 2025, 10:58 | 0.25 | 0.25 mg/l |
| 1 Nov 2024, 12:12 | 0.4 | 0.4 mg/l |
| 14 Oct 2024, 10:27 | 0.25 | 0.25 mg/l |
| 2 Sep 2024, 11:38 | 2.3 | 2.3 mg/l |
| 2 Aug 2024, 12:04 | 2.2 | 2.2 mg/l |
| 2 Jul 2024, 11:57 | 1.8 | 1.8 mg/l |
| 12 Jun 2024, 12:41 | 1 | 1 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
985 µS/cm
Sampled 3 Aug 2026, 59 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Aug 2026, 12:32 | 985 | 985 µS/cm |
| 3 Jun 2026, 12:34 | 775 | 775 µS/cm |
| 13 May 2026, 12:08 | 878 | 878 µS/cm |
| 10 Apr 2026, 09:41 | 881 | 881 µS/cm |
| 3 Mar 2026, 11:56 | 657 | 657 µS/cm |
| 12 Feb 2026, 12:01 | 610 | 610 µS/cm |
| 15 Jan 2026, 12:44 | 735 | 735 µS/cm |
| 5 Dec 2025, 10:59 | 758 | 758 µS/cm |
| 7 Nov 2025, 14:59 | 958 | 958 µS/cm |
| 7 Oct 2025, 11:32 | 872 | 872 µS/cm |
| 12 Sep 2025, 15:09 | 932 | 932 µS/cm |
| 7 Aug 2025, 11:29 | 943 | 943 µS/cm |
| 2 Jul 2025, 10:52 | 962 | 962 µS/cm |
| 11 Jun 2025, 10:31 | 896 | 896 µS/cm |
| 8 May 2025, 10:13 | 926 | 926 µS/cm |
| 22 Apr 2025, 14:11 | 885 | 885 µS/cm |
| 4 Mar 2025, 10:28 | 759 | 759 µS/cm |
| 7 Feb 2025, 12:22 | 749 | 749 µS/cm |
| 13 Jan 2025, 10:58 | 741 | 741 µS/cm |
| 3 Dec 2024, 11:23 | 696 | 696 µS/cm |
| 1 Nov 2024, 12:12 | 787 | 787 µS/cm |
| 14 Oct 2024, 10:27 | 682 | 682 µS/cm |
| 2 Sep 2024, 11:38 | 980 | 980 µS/cm |
| 2 Aug 2024, 12:04 | 955 | 955 µS/cm |
| 2 Jul 2024, 11:57 | 943 | 943 µS/cm |
| 12 Jun 2024, 12:41 | 900 | 900 µS/cm |
Everything measured here
14 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 14 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 26 | Jun 2024 – Aug 2026 | 87.8% 3 Aug 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 26 | Jun 2024 – Aug 2026 | 8.48 mg/l 3 Aug 2026 |
| Temperature of Water 0076 | River water | 26 | Jun 2024 – Aug 2026 | 16.9 °C 3 Aug 2026 |
| pH 0061 | River water | 26 | Jun 2024 – Aug 2026 | 7.81 3 Aug 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 26 | Jun 2024 – Aug 2026 | below 0.03 mg/l 3 Aug 2026 |
| Nitrate as N 0117 | River water | 26 | Jun 2024 – Aug 2026 | 18 mg/l 3 Aug 2026 |
| Orthophosphate, reactive as P 0180 | River water | 25 | Jun 2024 – Aug 2026 | 3.2 mg/l 3 Aug 2026 |
| Conductivity at 25 C 0077 | River water | 26 | Jun 2024 – Aug 2026 | 985 µS/cm 3 Aug 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 25 | Jun 2024 – Aug 2026 | 210 mg/l 3 Aug 2026 |
| Ammonia un-ionised as N 0119 | River water | 26 | Jun 2024 – Aug 2026 | below 0.00059 mg/l 3 Aug 2026 |
| BOD : 5 Day ATU 0085 | River water | 26 | Jun 2024 – Aug 2026 | below 4 mg/l 3 Aug 2026 |
| Nitrite as N 0118 | River water | 26 | Jun 2024 – Aug 2026 | 0.013 mg/l 3 Aug 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 26 | Jun 2024 – Aug 2026 | 18 mg/l 3 Aug 2026 |
| No flow /No sample 7668 | River water | 2 | Jul 2026 – Sep 2026 | No flow/discharge at sampling point 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.