Stambourne Brook Nun's Walk
EA name: STAMBOURNE BK. NUN'S WALK
Environment Agency sampling point AN-CL0851 · 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
- 17 Sep 2026, 14:5614 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 29 since 4 Oct 2023 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) · results completed 19 Sep 2026
- Where
- National Grid 575707, 238507As published, to the nearest 1 m. Open in a map
- River, by its own name
- Its name does not give one
- River, by the map
- River ColnePlaced by position alone, on a line whose map name differs from its own, 0 m from the line.
- Next gauge downstream
- Poole Street On the River Colne · 3.3 km along the river
- Why it was sampled
- Planned investigation (local monitoring) (20 samples)
Monitoring (national agency policy) (6 samples)
Planned investigation (national agency policy) (3 samples)
Results here were completed a median of 3 days after the sample was taken (2 to 7 days, 12 samples). 1 visit found no water to sample (recorded as “No flow”).
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
66.2%
Sampled 17 Sep 2026, 14 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Sep 2026, 14:56 | 66.2 | 66.2% |
| 14 Aug 2026, 13:25 | 69.7 | 69.7% |
| 10 Jun 2026, 14:17 | 65.6 | 65.6% |
| 5 May 2026, 12:38 | 94.5 | 94.5% |
| 15 Apr 2026, 10:08 | 99.1 | 99.1% |
| 9 Mar 2026, 14:15 | 107.3 | 107.3% |
| 2 Feb 2026, 11:12 | 97.5 | 97.5% |
| 5 Jan 2026, 11:31 | 90.5 | 90.5% |
| 9 Dec 2025, 13:06 | 96.3 | 96.3% |
| 7 Nov 2025, 10:43 | 51.7 | 51.7% |
| 8 Oct 2025, 10:55 | 69.3 | 69.3% |
| 1 Apr 2025, 09:42 | 91.3 | 91.3% |
| 18 Mar 2025, 08:36 | 99.1 | 99.1% |
| 10 Feb 2025, 08:58 | 99.8 | 99.8% |
| 16 Jan 2025, 10:37 | 95.2 | 95.2% |
| 6 Dec 2024, 09:40 | 97.1 | 97.1% |
| 4 Nov 2024, 10:09 | 74.6 | 74.6% |
| 7 Oct 2024, 09:16 | 87.5 | 87.5% |
| 2 Sep 2024, 10:37 | 76.7 | 76.7% |
| 5 Aug 2024, 08:12 | 100.3 | 100.3% |
| 9 Jul 2024, 13:30 | 91.2 | 91.2% |
| 11 Jun 2024, 13:26 | 88.4 | 88.4% |
| 7 Mar 2024, 10:35 | 100.2 | 100.2% |
| 1 Feb 2024, 12:50 | 95.8 | 95.8% |
| 4 Jan 2024, 14:12 | 97.5 | 97.5% |
| 4 Dec 2023, 11:35 | 95.9 | 95.9% |
| 7 Nov 2023, 10:43 | 96.3 | 96.3% |
| 4 Oct 2023, 10:16 | 69 | 69% |
Dissolved oxygen
as O2 · code 9924 · mg/l
6.62 mg/l
Sampled 17 Sep 2026, 14 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Sep 2026, 14:56 | 6.62 | 6.62 mg/l |
| 14 Aug 2026, 13:25 | 6.41 | 6.41 mg/l |
| 10 Jun 2026, 14:17 | 6.8 | 6.8 mg/l |
| 5 May 2026, 12:38 | 9.71 | 9.71 mg/l |
| 15 Apr 2026, 10:08 | 10.9 | 10.9 mg/l |
| 9 Mar 2026, 14:15 | 12.4 | 12.4 mg/l |
| 2 Feb 2026, 11:12 | 11.9 | 11.9 mg/l |
| 5 Jan 2026, 11:31 | 12.7 | 12.7 mg/l |
| 9 Dec 2025, 13:06 | 10.8 | 10.8 mg/l |
| 7 Nov 2025, 10:43 | 5.5 | 5.5 mg/l |
| 8 Oct 2025, 10:55 | 7.28 | 7.28 mg/l |
| 1 Apr 2025, 09:42 | 10.7 | 10.7 mg/l |
| 18 Mar 2025, 08:36 | 12.8 | 12.8 mg/l |
| 10 Feb 2025, 08:58 | 12.8 | 12.8 mg/l |
| 16 Jan 2025, 10:37 | 11.6 | 11.6 mg/l |
| 6 Dec 2024, 09:40 | 11.7 | 11.7 mg/l |
| 4 Nov 2024, 10:09 | 8.15 | 8.15 mg/l |
| 7 Oct 2024, 09:16 | 9.37 | 9.37 mg/l |
| 2 Sep 2024, 10:37 | 7.42 | 7.42 mg/l |
| 5 Aug 2024, 08:12 | 9.79 | 9.79 mg/l |
| 9 Jul 2024, 13:30 | 9.02 | 9.02 mg/l |
| 11 Jun 2024, 13:26 | 9.09 | 9.09 mg/l |
| 7 Mar 2024, 10:35 | 12 | 12 mg/l |
| 1 Feb 2024, 12:50 | 11.7 | 11.7 mg/l |
| 4 Jan 2024, 14:12 | 11.5 | 11.5 mg/l |
| 4 Dec 2023, 11:35 | 12 | 12 mg/l |
| 7 Nov 2023, 10:43 | 11 | 11 mg/l |
| 4 Oct 2023, 10:16 | 7.03 | 7.03 mg/l |
Water temperature
code 0076 · °C
15.3 °C
Sampled 17 Sep 2026, 14 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Sep 2026, 14:56 | 15.3 | 15.3 °C |
| 14 Aug 2026, 13:25 | 19.3 | 19.3 °C |
| 10 Jun 2026, 14:17 | 13.6 | 13.6 °C |
| 5 May 2026, 12:38 | 14 | 14 °C |
| 15 Apr 2026, 10:08 | 11.1 | 11.1 °C |
| 9 Mar 2026, 14:15 | 8.9 | 8.9 °C |
| 2 Feb 2026, 11:12 | 6.7 | 6.7 °C |
| 5 Jan 2026, 11:31 | 1.4 | 1.4 °C |
| 9 Dec 2025, 13:06 | 10 | 10 °C |
| 7 Nov 2025, 10:43 | 12.5 | 12.5 °C |
| 8 Oct 2025, 10:55 | 13 | 13 °C |
| 1 Apr 2025, 09:42 | 8.3 | 8.3 °C |
| 18 Mar 2025, 08:36 | 4.6 | 4.6 °C |
| 10 Feb 2025, 08:58 | 4.8 | 4.8 °C |
| 16 Jan 2025, 10:37 | 6.7 | 6.7 °C |
| 6 Dec 2024, 09:40 | 7.3 | 7.3 °C |
| 4 Nov 2024, 10:09 | 11.3 | 11.3 °C |
| 7 Oct 2024, 09:16 | 12.2 | 12.2 °C |
| 2 Sep 2024, 10:37 | 16.8 | 16.8 °C |
| 5 Aug 2024, 08:12 | 16.4 | 16.4 °C |
| 9 Jul 2024, 13:30 | 15.8 | 15.8 °C |
| 11 Jun 2024, 13:26 | 14 | 14 °C |
| 7 Mar 2024, 10:35 | 7.4 | 7.4 °C |
| 1 Feb 2024, 12:50 | 6.7 | 6.7 °C |
| 4 Jan 2024, 14:12 | 8 | 8 °C |
| 4 Dec 2023, 11:35 | 5.9 | 5.9 °C |
| 7 Nov 2023, 10:43 | 9.3 | 9.3 °C |
| 4 Oct 2023, 10:16 | 14.4 | 14.4 °C |
pH
code 0061
7.86
Sampled 17 Sep 2026, 14 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Sep 2026, 14:56 | 7.86 | 7.86 |
| 14 Aug 2026, 13:25 | 8.07 | 8.07 |
| 10 Jun 2026, 14:17 | 7.66 | 7.66 |
| 5 May 2026, 12:38 | 7.96 | 7.96 |
| 15 Apr 2026, 10:08 | 7.89 | 7.89 |
| 9 Mar 2026, 14:15 | 8.11 | 8.11 |
| 2 Feb 2026, 11:12 | 8.09 | 8.09 |
| 5 Jan 2026, 11:31 | 8.07 | 8.07 |
| 9 Dec 2025, 13:06 | 7.92 | 7.92 |
| 7 Nov 2025, 10:43 | 7.62 | 7.62 |
| 8 Oct 2025, 10:55 | 7.89 | 7.89 |
| 1 Apr 2025, 09:42 | 8.03 | 8.03 |
| 18 Mar 2025, 08:36 | 8.03 | 8.03 |
| 10 Feb 2025, 08:58 | 8.1 | 8.1 |
| 16 Jan 2025, 10:37 | 8.04 | 8.04 |
| 6 Dec 2024, 09:40 | 8.08 | 8.08 |
| 4 Nov 2024, 10:09 | 7.7 | 7.7 |
| 7 Oct 2024, 09:16 | 7.8 | 7.8 |
| 2 Sep 2024, 10:37 | 7.86 | 7.86 |
| 5 Aug 2024, 08:12 | 6.87 | 6.87 |
| 9 Jul 2024, 13:30 | 7.98 | 7.98 |
| 11 Jun 2024, 13:26 | 7.93 | 7.93 |
| 7 Mar 2024, 10:35 | 8.2 | 8.2 |
| 1 Feb 2024, 12:50 | 8.1 | 8.1 |
| 4 Jan 2024, 14:12 | 8.1 | 8.1 |
| 4 Dec 2023, 11:35 | 8 | 8 |
| 7 Nov 2023, 10:43 | 8 | 8 |
| 4 Oct 2023, 10:16 | 7.78 | 7.78 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.043 mg/l
Sampled 17 Sep 2026, 14 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Sep 2026, 14:56 | 0.043 | 0.043 mg/l |
| 14 Aug 2026, 13:25 | 0.033 | 0.033 mg/l |
| 10 Jun 2026, 14:17 | 0.41 | 0.41 mg/l |
| 5 May 2026, 12:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Apr 2026, 10:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Mar 2026, 14:15 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Feb 2026, 11:12 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Jan 2026, 11:31 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Dec 2025, 13:06 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Nov 2025, 10:43 | 0.04 | 0.04 mg/l |
| 8 Oct 2025, 10:55 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Apr 2025, 09:42 | 0.39 | 0.39 mg/l |
| 18 Mar 2025, 08:36 | 0.082 | 0.082 mg/l |
| 10 Feb 2025, 08:58 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Jan 2025, 10:37 | 0.031 | 0.031 mg/l |
| 4 Nov 2024, 10:09 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Oct 2024, 09:16 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Sep 2024, 10:37 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Aug 2024, 08:12 | 0.083 | 0.083 mg/l |
| 9 Jul 2024, 13:30 | 0.049 | 0.049 mg/l |
| 11 Jun 2024, 13:26 | 0.071 | 0.071 mg/l |
| 7 Mar 2024, 10:35 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Jan 2024, 14:12 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Dec 2023, 11:35 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Nov 2023, 10:43 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Oct 2023, 10:16 | 0.12 | 0.12 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
1.19 mg/l
Sampled 17 Sep 2026, 14 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Sep 2026, 14:56 | 1.19 | 1.19 mg/l |
| 14 Aug 2026, 13:25 | 0.786 | 0.786 mg/l |
| 10 Jun 2026, 14:17 | 4.59 | 4.59 mg/l |
| 5 May 2026, 12:38 | 1.28 | 1.28 mg/l |
| 15 Apr 2026, 10:08 | 3.08 | 3.08 mg/l |
| 9 Mar 2026, 14:15 | 8.38 | 8.38 mg/l |
| 2 Feb 2026, 11:12 | 20 | 20 mg/l |
| 5 Jan 2026, 11:31 | 12 | 12 mg/l |
| 9 Dec 2025, 13:06 | 42 | 42 mg/l |
| 7 Nov 2025, 10:43 | 0.306 | 0.306 mg/l |
| 8 Oct 2025, 10:55 | 0.626 | 0.626 mg/l |
| 1 Apr 2025, 09:42 | 4.67 | 4.67 mg/l |
| 18 Mar 2025, 08:36 | 6.49 | 6.49 mg/l |
| 10 Feb 2025, 08:58 | 15 | 15 mg/l |
| 16 Jan 2025, 10:37 | 8.29 | 8.29 mg/l |
| 4 Nov 2024, 10:09 | 2.78 | 2.78 mg/l |
| 7 Oct 2024, 09:16 | 8.37 | 8.37 mg/l |
| 2 Sep 2024, 10:37 | 0.514 | 0.514 mg/l |
| 5 Aug 2024, 08:12 | 1.77 | 1.77 mg/l |
| 9 Jul 2024, 13:30 | 11 | 11 mg/l |
| 11 Jun 2024, 13:26 | 4.26 | 4.26 mg/l |
| 7 Mar 2024, 10:35 | 8.29 | 8.29 mg/l |
| 1 Feb 2024, 12:50 | 8.77 | 8.77 mg/l |
| 4 Jan 2024, 14:12 | 12 | 12 mg/l |
| 4 Dec 2023, 11:35 | 15 | 15 mg/l |
| 7 Nov 2023, 10:43 | 14 | 14 mg/l |
| 4 Oct 2023, 10:16 | 1.05 | 1.05 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.16 mg/l
Sampled 17 Sep 2026, 14 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Sep 2026, 14:56 | 0.16 | 0.16 mg/l |
| 14 Aug 2026, 13:25 | 0.11 | 0.11 mg/l |
| 10 Jun 2026, 14:17 | 0.09 | 0.09 mg/l |
| 5 May 2026, 12:38 | 0.015 | 0.015 mg/l |
| 15 Apr 2026, 10:08 | <0.01 | below 0.01 mg/l (not detected above this) |
| 9 Mar 2026, 14:15 | 0.019 | 0.019 mg/l |
| 2 Feb 2026, 11:12 | 0.028 | 0.028 mg/l |
| 5 Jan 2026, 11:31 | 0.033 | 0.033 mg/l |
| 9 Dec 2025, 13:06 | 0.046 | 0.046 mg/l |
| 7 Nov 2025, 10:43 | 0.11 | 0.11 mg/l |
| 8 Oct 2025, 10:55 | 0.19 | 0.19 mg/l |
| 1 Apr 2025, 09:42 | 0.063 | 0.063 mg/l |
| 18 Mar 2025, 08:36 | 0.024 | 0.024 mg/l |
| 10 Feb 2025, 08:58 | 0.031 | 0.031 mg/l |
| 16 Jan 2025, 10:37 | 0.045 | 0.045 mg/l |
| 4 Nov 2024, 10:09 | 0.17 | 0.17 mg/l |
| 7 Oct 2024, 09:16 | 0.13 | 0.13 mg/l |
| 2 Sep 2024, 10:37 | 0.11 | 0.11 mg/l |
| 5 Aug 2024, 08:12 | 0.086 | 0.086 mg/l |
| 9 Jul 2024, 13:30 | 0.14 | 0.14 mg/l |
| 11 Jun 2024, 13:26 | 0.13 | 0.13 mg/l |
| 7 Mar 2024, 10:35 | 0.055 | 0.055 mg/l |
| 1 Feb 2024, 12:50 | 0.12 | 0.12 mg/l |
| 4 Jan 2024, 14:12 | 0.043 | 0.043 mg/l |
| 4 Dec 2023, 11:35 | 0.048 | 0.048 mg/l |
| 7 Nov 2023, 10:43 | 0.048 | 0.048 mg/l |
| 4 Oct 2023, 10:16 | 0.14 | 0.14 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
974 µS/cm
Sampled 17 Sep 2026, 14 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Sep 2026, 14:56 | 974 | 974 µS/cm |
| 14 Aug 2026, 13:25 | 805 | 805 µS/cm |
| 10 Jun 2026, 14:17 | 811 | 811 µS/cm |
| 5 May 2026, 12:38 | 846 | 846 µS/cm |
| 15 Apr 2026, 10:08 | 888 | 888 µS/cm |
| 9 Mar 2026, 14:15 | 792 | 792 µS/cm |
| 2 Feb 2026, 11:12 | 693 | 693 µS/cm |
| 5 Jan 2026, 11:31 | 924 | 924 µS/cm |
| 9 Dec 2025, 13:06 | 793 | 793 µS/cm |
| 7 Nov 2025, 10:43 | 996 | 996 µS/cm |
| 8 Oct 2025, 10:55 | 911 | 911 µS/cm |
| 1 Apr 2025, 09:42 | 860 | 860 µS/cm |
| 18 Mar 2025, 08:36 | 861 | 861 µS/cm |
| 10 Feb 2025, 08:58 | 717 | 717 µS/cm |
| 16 Jan 2025, 10:37 | 834 | 834 µS/cm |
| 6 Dec 2024, 09:40 | 683 | 683 µS/cm |
| 4 Nov 2024, 10:09 | 906 | 906 µS/cm |
| 7 Oct 2024, 09:16 | 808 | 808 µS/cm |
| 2 Sep 2024, 10:37 | 899 | 899 µS/cm |
| 5 Aug 2024, 08:12 | 877 | 877 µS/cm |
| 9 Jul 2024, 13:30 | 801 | 801 µS/cm |
| 11 Jun 2024, 13:26 | 905 | 905 µS/cm |
| 7 Mar 2024, 10:35 | 741 | 741 µS/cm |
| 1 Feb 2024, 12:50 | 833 | 833 µS/cm |
| 4 Jan 2024, 14:12 | 695 | 695 µS/cm |
| 4 Dec 2023, 11:35 | 661 | 661 µS/cm |
| 7 Nov 2023, 10:43 | 749 | 749 µS/cm |
| 4 Oct 2023, 10:16 | 907 | 907 µS/cm |
E. coli
confirmed, membrane filtration · code 2348 · per 100 ml
1900 per 100 ml
Sampled 4 Dec 2023, 2.8 years ago · 3 results banked
Every result (3)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Dec 2023, 11:35 | 1900 | 1900 per 100 ml |
| 7 Nov 2023, 10:43 | 1100 | 1100 per 100 ml |
| 4 Oct 2023, 10:16 | 1300 | 1300 per 100 ml |
Everything measured here
16 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 16 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 28 | Oct 2023 – Sep 2026 | 66.2% 17 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 28 | Oct 2023 – Sep 2026 | 6.62 mg/l 17 Sep 2026 |
| Temperature of Water 0076 | River water | 28 | Oct 2023 – Sep 2026 | 15.3 °C 17 Sep 2026 |
| pH 0061 | River water | 28 | Oct 2023 – Sep 2026 | 7.86 17 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 26 | Oct 2023 – Sep 2026 | 0.043 mg/l 17 Sep 2026 |
| Nitrate as N 0117 | River water | 27 | Oct 2023 – Sep 2026 | 1.19 mg/l 17 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 27 | Oct 2023 – Sep 2026 | 0.16 mg/l 17 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 28 | Oct 2023 – Sep 2026 | 974 µS/cm 17 Sep 2026 |
| Escherichia coli : Confirmed : MF 2348 | River water | 3 | Oct 2023 – Dec 2023 | 1900 per 100 ml 4 Dec 2023 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 27 | Oct 2023 – Sep 2026 | 320 mg/l 17 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 26 | Oct 2023 – Sep 2026 | 0.00084 mg/l 17 Sep 2026 |
| Enterococci: Intestinal: Confirmed: MF 3723 | River water | 3 | Oct 2023 – Dec 2023 | 1300 colony forming units / 100ml 4 Dec 2023 |
| Enterococci: Intestinal: Presumptive: MF 3722 | River water | 3 | Oct 2023 – Dec 2023 | 1600 colony forming units / 100ml 4 Dec 2023 |
| Nitrite as N 0118 | River water | 27 | Oct 2023 – Sep 2026 | 0.0087 mg/l 17 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 27 | Oct 2023 – Sep 2026 | 1.2 mg/l 17 Sep 2026 |
| No flow /No sample 7668 | River water | 1 | Jul 2026 – Jul 2026 | No flow/discharge at sampling point 9 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.