Knuston Brook A45 Road Bridge Irchester
EA name: KNUSTON BK.A45 RD.BR.IRCHESTER
Environment Agency sampling point AN-KNUS100A · 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, 10:2127 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 29 since 5 Oct 2023 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 492900, 267100As published, to the nearest 100 m (so up to about 70 m out). Open in a map
- River, by its own name
- Knuston Brook
- River, by the map
- Knuston BrookPlaced on the river its name gives, 27 m from the line.
- Next gauge downstream
- Islip Sluice On the River Nene · 22 km along the river
- Why it was sampled
- Environmental monitoring statutory (EU directives) (23 samples)
Planned investigation (local monitoring) (6 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
64.5%
Sampled 4 Sep 2026, 27 days ago · 29 results banked
Every result (29)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 10:21 | 64.5 | 64.5% |
| 14 Aug 2026, 11:47 | 56.2 | 56.2% |
| 8 Jul 2026, 10:28 | 61.4 | 61.4% |
| 23 Jun 2026, 12:53 | 67.5 | 67.5% |
| 8 May 2026, 10:09 | 85.3 | 85.3% |
| 21 Apr 2026, 14:06 | 104.7 | 104.7% |
| 2 Mar 2026, 13:32 | 96.7 | 96.7% |
| 2 Feb 2026, 11:19 | 92.3 | 92.3% |
| 5 Jan 2026, 13:58 | 94.8 | 94.8% |
| 2 Dec 2025, 11:39 | 91.1 | 91.1% |
| 11 Nov 2025, 12:37 | 71.6 | 71.6% |
| 14 Oct 2025, 13:05 | 76.9 | 76.9% |
| 1 Apr 2025, 11:49 | 98.5 | 98.5% |
| 11 Mar 2025, 10:28 | 97.7 | 97.7% |
| 4 Feb 2025, 10:58 | 96.9 | 96.9% |
| 13 Jan 2025, 10:25 | 101 | 101% |
| 2 Dec 2024, 10:39 | 91 | 91% |
| 4 Nov 2024, 12:26 | 88.5 | 88.5% |
| 2 Oct 2024, 12:48 | 90.6 | 90.6% |
| 9 Sep 2024, 15:01 | 83.1 | 83.1% |
| 1 Aug 2024, 12:22 | 77.3 | 77.3% |
| 4 Jul 2024, 11:07 | 71.7 | 71.7% |
| 7 Jun 2024, 13:19 | 91.6 | 91.6% |
| 5 Mar 2024, 13:44 | 96.3 | 96.3% |
| 7 Feb 2024, 12:20 | 96.4 | 96.4% |
| 2 Jan 2024, 10:14 | 95 | 95% |
| 4 Dec 2023, 11:20 | 91.7 | 91.7% |
| 1 Nov 2023, 13:39 | 86.9 | 86.9% |
| 5 Oct 2023, 10:46 | 69.5 | 69.5% |
Dissolved oxygen
as O2 · code 9924 · mg/l
6.18 mg/l
Sampled 4 Sep 2026, 27 days ago · 29 results banked
Every result (29)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 10:21 | 6.18 | 6.18 mg/l |
| 14 Aug 2026, 11:47 | 5.16 | 5.16 mg/l |
| 8 Jul 2026, 10:28 | 5.69 | 5.69 mg/l |
| 23 Jun 2026, 12:53 | 6.21 | 6.21 mg/l |
| 8 May 2026, 10:09 | 9.11 | 9.11 mg/l |
| 21 Apr 2026, 14:06 | 11.3 | 11.3 mg/l |
| 2 Mar 2026, 13:32 | 10.8 | 10.8 mg/l |
| 2 Feb 2026, 11:19 | 11.1 | 11.1 mg/l |
| 5 Jan 2026, 13:58 | 12.7 | 12.7 mg/l |
| 2 Dec 2025, 11:39 | 10.7 | 10.7 mg/l |
| 11 Nov 2025, 12:37 | 7.88 | 7.88 mg/l |
| 14 Oct 2025, 13:05 | 8.31 | 8.31 mg/l |
| 1 Apr 2025, 11:49 | 11.2 | 11.2 mg/l |
| 11 Mar 2025, 10:28 | 11.7 | 11.7 mg/l |
| 4 Feb 2025, 10:58 | 12 | 12 mg/l |
| 13 Jan 2025, 10:25 | 13.8 | 13.8 mg/l |
| 2 Dec 2024, 10:39 | 10.4 | 10.4 mg/l |
| 4 Nov 2024, 12:26 | 9.65 | 9.65 mg/l |
| 2 Oct 2024, 12:48 | 9.46 | 9.46 mg/l |
| 9 Sep 2024, 15:01 | 8.23 | 8.23 mg/l |
| 1 Aug 2024, 12:22 | 7.31 | 7.31 mg/l |
| 4 Jul 2024, 11:07 | 7.35 | 7.35 mg/l |
| 7 Jun 2024, 13:19 | 9.5 | 9.5 mg/l |
| 5 Mar 2024, 13:44 | 11.4 | 11.4 mg/l |
| 7 Feb 2024, 12:20 | 11.5 | 11.5 mg/l |
| 2 Jan 2024, 10:14 | 11.1 | 11.1 mg/l |
| 4 Dec 2023, 11:20 | 11.3 | 11.3 mg/l |
| 1 Nov 2023, 13:39 | 9.56 | 9.56 mg/l |
| 5 Oct 2023, 10:46 | 7.21 | 7.21 mg/l |
Water temperature
code 0076 · °C
17.3 °C
Sampled 4 Sep 2026, 27 days ago · 29 results banked
Every result (29)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 10:21 | 17.3 | 17.3 °C |
| 14 Aug 2026, 11:47 | 19.4 | 19.4 °C |
| 8 Jul 2026, 10:28 | 18.9 | 18.9 °C |
| 23 Jun 2026, 12:53 | 19.3 | 19.3 °C |
| 8 May 2026, 10:09 | 12.3 | 12.3 °C |
| 21 Apr 2026, 14:06 | 11.9 | 11.9 °C |
| 2 Mar 2026, 13:32 | 10.5 | 10.5 °C |
| 2 Feb 2026, 11:19 | 7.4 | 7.4 °C |
| 5 Jan 2026, 13:58 | 3.2 | 3.2 °C |
| 2 Dec 2025, 11:39 | 8.4 | 8.4 °C |
| 11 Nov 2025, 12:37 | 11 | 11 °C |
| 14 Oct 2025, 13:05 | 11.8 | 11.8 °C |
| 1 Apr 2025, 11:49 | 9.8 | 9.8 °C |
| 11 Mar 2025, 10:28 | 7.5 | 7.5 °C |
| 4 Feb 2025, 10:58 | 6.3 | 6.3 °C |
| 13 Jan 2025, 10:25 | 2.3 | 2.3 °C |
| 2 Dec 2024, 10:39 | 9.4 | 9.4 °C |
| 4 Nov 2024, 12:26 | 11.4 | 11.4 °C |
| 2 Oct 2024, 12:48 | 13.3 | 13.3 °C |
| 9 Sep 2024, 15:01 | 15.7 | 15.7 °C |
| 1 Aug 2024, 12:22 | 17.9 | 17.9 °C |
| 4 Jul 2024, 11:07 | 14.1 | 14.1 °C |
| 7 Jun 2024, 13:19 | 13.6 | 13.6 °C |
| 5 Mar 2024, 13:44 | 8 | 8 °C |
| 7 Feb 2024, 12:20 | 7.7 | 7.7 °C |
| 2 Jan 2024, 10:14 | 8.6 | 8.6 °C |
| 4 Dec 2023, 11:20 | 6.3 | 6.3 °C |
| 1 Nov 2023, 13:39 | 11 | 11 °C |
| 5 Oct 2023, 10:46 | 13.6 | 13.6 °C |
pH
code 0061
7.77
Sampled 4 Sep 2026, 27 days ago · 29 results banked
Every result (29)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 10:21 | 7.77 | 7.77 |
| 14 Aug 2026, 11:47 | 7.78 | 7.78 |
| 8 Jul 2026, 10:28 | 7.63 | 7.63 |
| 23 Jun 2026, 12:53 | 7.73 | 7.73 |
| 8 May 2026, 10:09 | 7.84 | 7.84 |
| 21 Apr 2026, 14:06 | 7.89 | 7.89 |
| 2 Mar 2026, 13:32 | 8.02 | 8.02 |
| 2 Feb 2026, 11:19 | 8.01 | 8.01 |
| 5 Jan 2026, 13:58 | 7.94 | 7.94 |
| 2 Dec 2025, 11:39 | 7.99 | 7.99 |
| 11 Nov 2025, 12:37 | 7.77 | 7.77 |
| 14 Oct 2025, 13:05 | 7.93 | 7.93 |
| 1 Apr 2025, 11:49 | 7.96 | 7.96 |
| 11 Mar 2025, 10:28 | 8.15 | 8.15 |
| 4 Feb 2025, 10:58 | 8.06 | 8.06 |
| 13 Jan 2025, 10:25 | 8.21 | 8.21 |
| 2 Dec 2024, 10:39 | 7.98 | 7.98 |
| 4 Nov 2024, 12:26 | 7.94 | 7.94 |
| 2 Oct 2024, 12:48 | 7.88 | 7.88 |
| 9 Sep 2024, 15:01 | 7.76 | 7.76 |
| 1 Aug 2024, 12:22 | 7.82 | 7.82 |
| 4 Jul 2024, 11:07 | 7.75 | 7.75 |
| 7 Jun 2024, 13:19 | 7.92 | 7.92 |
| 5 Mar 2024, 13:44 | 7.99 | 7.99 |
| 7 Feb 2024, 12:20 | 8.12 | 8.12 |
| 2 Jan 2024, 10:14 | 7.93 | 7.93 |
| 4 Dec 2023, 11:20 | 7.88 | 7.88 |
| 1 Nov 2023, 13:39 | 7.85 | 7.85 |
| 5 Oct 2023, 10:46 | 7.82 | 7.82 |
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 · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 10:21 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Aug 2026, 11:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Jul 2026, 10:28 | 0.031 | 0.031 mg/l |
| 23 Jun 2026, 12:53 | 0.053 | 0.053 mg/l |
| 8 May 2026, 10:09 | 0.04 | 0.04 mg/l |
| 21 Apr 2026, 14:06 | 0.051 | 0.051 mg/l |
| 2 Mar 2026, 13:32 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Feb 2026, 11:19 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Jan 2026, 13:58 | 0.048 | 0.048 mg/l |
| 2 Dec 2025, 11:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Nov 2025, 12:37 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Oct 2025, 13:05 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Mar 2025, 10:28 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Feb 2025, 10:58 | 0.039 | 0.039 mg/l |
| 13 Jan 2025, 10:25 | 0.085 | 0.085 mg/l |
| 2 Dec 2024, 10:39 | 0.098 | 0.098 mg/l |
| 4 Nov 2024, 12:26 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Oct 2024, 12:48 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Sep 2024, 15:01 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Aug 2024, 12:22 | 0.035 | 0.035 mg/l |
| 4 Jul 2024, 11:07 | 0.063 | 0.063 mg/l |
| 7 Jun 2024, 13:19 | 0.05 | 0.05 mg/l |
| 5 Mar 2024, 13:44 | 0.035 | 0.035 mg/l |
| 7 Feb 2024, 12:20 | 0.1 | 0.1 mg/l |
| 2 Jan 2024, 10:14 | 0.064 | 0.064 mg/l |
| 4 Dec 2023, 11:20 | 0.032 | 0.032 mg/l |
| 1 Nov 2023, 13:39 | 0.046 | 0.046 mg/l |
| 5 Oct 2023, 10:46 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
4.17 mg/l
Sampled 4 Sep 2026, 27 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 10:21 | 4.17 | 4.17 mg/l |
| 14 Aug 2026, 11:47 | 7.15 | 7.15 mg/l |
| 8 Jul 2026, 10:28 | 8.06 | 8.06 mg/l |
| 23 Jun 2026, 12:53 | 8.34 | 8.34 mg/l |
| 8 May 2026, 10:09 | 10.9 | 10.9 mg/l |
| 21 Apr 2026, 14:06 | 12 | 12 mg/l |
| 2 Mar 2026, 13:32 | 11 | 11 mg/l |
| 2 Feb 2026, 11:19 | 12 | 12 mg/l |
| 5 Jan 2026, 13:58 | 13 | 13 mg/l |
| 2 Dec 2025, 11:39 | 16 | 16 mg/l |
| 11 Nov 2025, 12:37 | 5.26 | 5.26 mg/l |
| 14 Oct 2025, 13:05 | 6.78 | 6.78 mg/l |
| 11 Mar 2025, 10:28 | 12 | 12 mg/l |
| 4 Feb 2025, 10:58 | 9.98 | 9.98 mg/l |
| 13 Jan 2025, 10:25 | 12 | 12 mg/l |
| 2 Dec 2024, 10:39 | 9.75 | 9.75 mg/l |
| 4 Nov 2024, 12:26 | 9.97 | 9.97 mg/l |
| 2 Oct 2024, 12:48 | 6.78 | 6.78 mg/l |
| 9 Sep 2024, 15:01 | 7.77 | 7.77 mg/l |
| 1 Aug 2024, 12:22 | 8.06 | 8.06 mg/l |
| 4 Jul 2024, 11:07 | 8.38 | 8.38 mg/l |
| 7 Jun 2024, 13:19 | 9.94 | 9.94 mg/l |
| 5 Mar 2024, 13:44 | 12 | 12 mg/l |
| 7 Feb 2024, 12:20 | 8.77 | 8.77 mg/l |
| 2 Jan 2024, 10:14 | 6.99 | 6.99 mg/l |
| 4 Dec 2023, 11:20 | 8.18 | 8.18 mg/l |
| 1 Nov 2023, 13:39 | 11 | 11 mg/l |
| 5 Oct 2023, 10:46 | 6.97 | 6.97 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.024 mg/l
Sampled 4 Sep 2026, 27 days ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 10:21 | 0.024 | 0.024 mg/l |
| 8 Jul 2026, 10:28 | 0.063 | 0.063 mg/l |
| 23 Jun 2026, 12:53 | 0.069 | 0.069 mg/l |
| 8 May 2026, 10:09 | 0.034 | 0.034 mg/l |
| 21 Apr 2026, 14:06 | 0.02 | 0.02 mg/l |
| 2 Mar 2026, 13:32 | 0.039 | 0.039 mg/l |
| 2 Feb 2026, 11:19 | 0.046 | 0.046 mg/l |
| 5 Jan 2026, 13:58 | 0.061 | 0.061 mg/l |
| 2 Dec 2025, 11:39 | 0.085 | 0.085 mg/l |
| 11 Nov 2025, 12:37 | 0.05 | 0.05 mg/l |
| 14 Oct 2025, 13:05 | 0.045 | 0.045 mg/l |
| 11 Mar 2025, 10:28 | 0.033 | 0.033 mg/l |
| 4 Feb 2025, 10:58 | 0.051 | 0.051 mg/l |
| 13 Jan 2025, 10:25 | 0.058 | 0.058 mg/l |
| 4 Nov 2024, 12:26 | 0.04 | 0.04 mg/l |
| 2 Oct 2024, 12:48 | 0.082 | 0.082 mg/l |
| 9 Sep 2024, 15:01 | 0.077 | 0.077 mg/l |
| 1 Aug 2024, 12:22 | 0.11 | 0.11 mg/l |
| 4 Jul 2024, 11:07 | 0.06 | 0.06 mg/l |
| 7 Jun 2024, 13:19 | 0.029 | 0.029 mg/l |
| 5 Mar 2024, 13:44 | 0.049 | 0.049 mg/l |
| 2 Jan 2024, 10:14 | 0.077 | 0.077 mg/l |
| 4 Dec 2023, 11:20 | 0.12 | 0.12 mg/l |
| 1 Nov 2023, 13:39 | 0.1 | 0.1 mg/l |
| 5 Oct 2023, 10:46 | 0.18 | 0.18 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
537 µS/cm
Sampled 4 Sep 2026, 27 days ago · 29 results banked
Every result (29)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 10:21 | 537 | 537 µS/cm |
| 14 Aug 2026, 11:47 | 726 | 726 µS/cm |
| 8 Jul 2026, 10:28 | 714 | 714 µS/cm |
| 23 Jun 2026, 12:53 | 719 | 719 µS/cm |
| 8 May 2026, 10:09 | 774 | 774 µS/cm |
| 21 Apr 2026, 14:06 | 785 | 785 µS/cm |
| 2 Mar 2026, 13:32 | 715 | 715 µS/cm |
| 2 Feb 2026, 11:19 | 680 | 680 µS/cm |
| 5 Jan 2026, 13:58 | 919 | 919 µS/cm |
| 2 Dec 2025, 11:39 | 695 | 695 µS/cm |
| 11 Nov 2025, 12:37 | 807 | 807 µS/cm |
| 14 Oct 2025, 13:05 | 810 | 810 µS/cm |
| 1 Apr 2025, 11:49 | 805 | 805 µS/cm |
| 11 Mar 2025, 10:28 | 836 | 836 µS/cm |
| 4 Feb 2025, 10:58 | 805 | 805 µS/cm |
| 13 Jan 2025, 10:25 | 885 | 885 µS/cm |
| 2 Dec 2024, 10:39 | 863 | 863 µS/cm |
| 4 Nov 2024, 12:26 | 858 | 858 µS/cm |
| 2 Oct 2024, 12:48 | 534 | 534 µS/cm |
| 9 Sep 2024, 15:01 | 786 | 786 µS/cm |
| 1 Aug 2024, 12:22 | 786 | 786 µS/cm |
| 4 Jul 2024, 11:07 | 799 | 799 µS/cm |
| 7 Jun 2024, 13:19 | 787 | 787 µS/cm |
| 5 Mar 2024, 13:44 | 817 | 817 µS/cm |
| 7 Feb 2024, 12:20 | 640 | 640 µS/cm |
| 2 Jan 2024, 10:14 | 541 | 541 µS/cm |
| 4 Dec 2023, 11:20 | 570 | 570 µS/cm |
| 1 Nov 2023, 13:39 | 810 | 810 µS/cm |
| 5 Oct 2023, 10:46 | 841 | 841 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 | 29 | Oct 2023 – Sep 2026 | 64.5% 4 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 29 | Oct 2023 – Sep 2026 | 6.18 mg/l 4 Sep 2026 |
| Temperature of Water 0076 | River water | 29 | Oct 2023 – Sep 2026 | 17.3 °C 4 Sep 2026 |
| pH 0061 | River water | 29 | Oct 2023 – Sep 2026 | 7.77 4 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 28 | Oct 2023 – Sep 2026 | below 0.03 mg/l 4 Sep 2026 |
| Nitrate as N 0117 | River water | 28 | Oct 2023 – Sep 2026 | 4.17 mg/l 4 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 25 | Oct 2023 – Sep 2026 | 0.024 mg/l 4 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 29 | Oct 2023 – Sep 2026 | 537 µS/cm 4 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 28 | Oct 2023 – Sep 2026 | 170 mg/l 4 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 28 | Oct 2023 – Sep 2026 | below 0.00056 mg/l 4 Sep 2026 |
| Nitrite as N 0118 | River water | 28 | Oct 2023 – Sep 2026 | 0.028 mg/l 4 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 28 | Oct 2023 – Sep 2026 | 4.2 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.