Hornsmill Brook at Marsh Lane
EA name: HORNSMILL BROOK AT MARSH LANE
Environment Agency sampling point NW-88000588 · 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
- 19 Aug 2026, 11:2343 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 29 since 27 Nov 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 347621, 376817As published, to the nearest 1 m. Open in a map
- River, by its own name
- Hornsmill Brook
- River, by the map
- Not placedIts name gives Hornsmill Brook; the only line close by, 6 m away, is Hoolpool Gutter and is not traced into it. The river map cannot say which watercourse this is.
- Next gauge downstream
- Not known
- Why it was sampled
- Monitoring (national agency policy) (15 samples)
Environmental monitoring statutory (EU directives) (14 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
42.1%
Sampled 19 Aug 2026, 43 days ago · 29 results banked
Every result (29)
| Sampled | Result as published | Reads as |
|---|---|---|
| 19 Aug 2026, 11:23 | 42.1 | 42.1% |
| 10 Jun 2026, 12:00 | 90.2 | 90.2% |
| 11 May 2026, 13:33 | 115.9 | 115.9% |
| 24 Mar 2026, 11:27 | 132.3 | 132.3% |
| 25 Feb 2026, 12:54 | 67.8 | 67.8% |
| 14 Jan 2026, 13:25 | 76.1 | 76.1% |
| 3 Dec 2025, 14:08 | 49.8 | 49.8% |
| 4 Nov 2025, 14:32 | 50.3 | 50.3% |
| 20 Oct 2025, 13:12 | 54.2 | 54.2% |
| 21 Aug 2025, 14:59 | 92.5 | 92.5% |
| 7 Jul 2025, 11:01 | 97.3 | 97.3% |
| 27 May 2025, 13:58 | 127.6 | 127.6% |
| 16 Apr 2025, 10:19 | 72 | 72% |
| 13 Mar 2025, 12:44 | 103.9 | 103.9% |
| 19 Feb 2025, 08:37 | 71.9 | 71.9% |
| 29 Jan 2025, 12:39 | 85.8 | 85.8% |
| 9 Dec 2024, 09:44 | 83.5 | 83.5% |
| 28 Nov 2024, 11:47 | 75.4 | 75.4% |
| 28 Oct 2024, 13:52 | 40.3 | 40.3% |
| 26 Sep 2024, 11:30 | 56.7 | 56.7% |
| 29 Aug 2024, 11:09 | 27.9 | 27.9% |
| 30 Jul 2024, 09:45 | 30.4 | 30.4% |
| 27 Jun 2024, 12:20 | 39.6 | 39.6% |
| 30 May 2024, 12:10 | 69.6 | 69.6% |
| 21 Mar 2024, 12:11 | 80.6 | 80.6% |
| 26 Feb 2024, 09:28 | 79.6 | 79.6% |
| 31 Jan 2024, 10:59 | 71.6 | 71.6% |
| 13 Dec 2023, 09:29 | 74.2 | 74.2% |
| 27 Nov 2023, 14:34 | 56.8 | 56.8% |
Dissolved oxygen
as O2 · code 9924 · mg/l
3.94 mg/l
Sampled 19 Aug 2026, 43 days ago · 29 results banked
Every result (29)
| Sampled | Result as published | Reads as |
|---|---|---|
| 19 Aug 2026, 11:23 | 3.94 | 3.94 mg/l |
| 10 Jun 2026, 12:00 | 9.14 | 9.14 mg/l |
| 11 May 2026, 13:33 | 12 | 12 mg/l |
| 24 Mar 2026, 11:27 | 14.7 | 14.7 mg/l |
| 25 Feb 2026, 12:54 | 7.73 | 7.73 mg/l |
| 14 Jan 2026, 13:25 | 9.89 | 9.89 mg/l |
| 3 Dec 2025, 14:08 | 6.16 | 6.16 mg/l |
| 4 Nov 2025, 14:32 | 5.25 | 5.25 mg/l |
| 20 Oct 2025, 13:12 | 5.61 | 5.61 mg/l |
| 21 Aug 2025, 14:59 | 8.67 | 8.67 mg/l |
| 7 Jul 2025, 11:01 | 9.37 | 9.37 mg/l |
| 27 May 2025, 13:58 | 12.7 | 12.7 mg/l |
| 16 Apr 2025, 10:19 | 7.8 | 7.8 mg/l |
| 13 Mar 2025, 12:44 | 12.7 | 12.7 mg/l |
| 19 Feb 2025, 08:37 | 9.72 | 9.72 mg/l |
| 29 Jan 2025, 12:39 | 10.6 | 10.6 mg/l |
| 9 Dec 2024, 09:44 | 10.4 | 10.4 mg/l |
| 28 Nov 2024, 11:47 | 9.98 | 9.98 mg/l |
| 28 Oct 2024, 13:52 | 4.28 | 4.28 mg/l |
| 26 Sep 2024, 11:30 | 6 | 6 mg/l |
| 29 Aug 2024, 11:09 | 2.72 | 2.72 mg/l |
| 30 Jul 2024, 09:45 | 2.93 | 2.93 mg/l |
| 27 Jun 2024, 12:20 | 3.58 | 3.58 mg/l |
| 30 May 2024, 12:10 | 7.02 | 7.02 mg/l |
| 21 Mar 2024, 12:11 | 9.19 | 9.19 mg/l |
| 26 Feb 2024, 09:28 | 10.2 | 10.2 mg/l |
| 31 Jan 2024, 10:59 | 9.16 | 9.16 mg/l |
| 13 Dec 2023, 09:29 | 9.06 | 9.06 mg/l |
| 27 Nov 2023, 14:34 | 7.04 | 7.04 mg/l |
Water temperature
code 0076 · °C
18.4 °C
Sampled 19 Aug 2026, 43 days ago · 29 results banked
Every result (29)
| Sampled | Result as published | Reads as |
|---|---|---|
| 19 Aug 2026, 11:23 | 18.4 | 18.4 °C |
| 10 Jun 2026, 12:00 | 14.6 | 14.6 °C |
| 11 May 2026, 13:33 | 13.5 | 13.5 °C |
| 24 Mar 2026, 11:27 | 10.3 | 10.3 °C |
| 25 Feb 2026, 12:54 | 9.1 | 9.1 °C |
| 14 Jan 2026, 13:25 | 3.9 | 3.9 °C |
| 3 Dec 2025, 14:08 | 6 | 6 °C |
| 4 Nov 2025, 14:32 | 12.5 | 12.5 °C |
| 20 Oct 2025, 13:12 | 13.1 | 13.1 °C |
| 21 Aug 2025, 14:59 | 18.3 | 18.3 °C |
| 7 Jul 2025, 11:01 | 17 | 17 °C |
| 27 May 2025, 13:58 | 15.3 | 15.3 °C |
| 16 Apr 2025, 10:19 | 10.9 | 10.9 °C |
| 13 Mar 2025, 12:44 | 6.6 | 6.6 °C |
| 19 Feb 2025, 08:37 | 2.8 | 2.8 °C |
| 29 Jan 2025, 12:39 | 6.1 | 6.1 °C |
| 9 Dec 2024, 09:44 | 5.8 | 5.8 °C |
| 28 Nov 2024, 11:47 | 3.6 | 3.6 °C |
| 28 Oct 2024, 13:52 | 12.5 | 12.5 °C |
| 26 Sep 2024, 11:30 | 12.7 | 12.7 °C |
| 29 Aug 2024, 11:09 | 16.5 | 16.5 °C |
| 30 Jul 2024, 09:45 | 17 | 17 °C |
| 27 Jun 2024, 12:20 | 20.1 | 20.1 °C |
| 30 May 2024, 12:10 | 14.9 | 14.9 °C |
| 21 Mar 2024, 12:11 | 9.5 | 9.5 °C |
| 26 Feb 2024, 09:28 | 4.8 | 4.8 °C |
| 31 Jan 2024, 10:59 | 4.9 | 4.9 °C |
| 13 Dec 2023, 09:29 | 6.7 | 6.7 °C |
| 27 Nov 2023, 14:34 | 6.1 | 6.1 °C |
pH
code 0061
7.5
Sampled 19 Aug 2026, 43 days ago · 29 results banked
Every result (29)
| Sampled | Result as published | Reads as |
|---|---|---|
| 19 Aug 2026, 11:23 | 7.5 | 7.5 |
| 10 Jun 2026, 12:00 | 8.14 | 8.14 |
| 11 May 2026, 13:33 | 8.05 | 8.05 |
| 24 Mar 2026, 11:27 | 7.99 | 7.99 |
| 25 Feb 2026, 12:54 | 7.6 | 7.6 |
| 14 Jan 2026, 13:25 | 7.64 | 7.64 |
| 3 Dec 2025, 14:08 | 7.26 | 7.26 |
| 4 Nov 2025, 14:32 | 7.42 | 7.42 |
| 20 Oct 2025, 13:12 | 7.49 | 7.49 |
| 21 Aug 2025, 14:59 | 8.09 | 8.09 |
| 7 Jul 2025, 11:01 | 8.07 | 8.07 |
| 27 May 2025, 13:58 | 8.82 | 8.82 |
| 16 Apr 2025, 10:19 | 8.12 | 8.12 |
| 13 Mar 2025, 12:44 | 8.34 | 8.34 |
| 19 Feb 2025, 08:37 | 7.95 | 7.95 |
| 29 Jan 2025, 12:39 | 7.74 | 7.74 |
| 9 Dec 2024, 09:44 | 7.71 | 7.71 |
| 28 Nov 2024, 11:47 | 7.74 | 7.74 |
| 28 Oct 2024, 13:52 | 7.34 | 7.34 |
| 26 Sep 2024, 11:30 | 7.57 | 7.57 |
| 29 Aug 2024, 11:09 | 7.67 | 7.67 |
| 30 Jul 2024, 09:45 | 7.43 | 7.43 |
| 27 Jun 2024, 12:20 | 7.44 | 7.44 |
| 30 May 2024, 12:10 | 7.79 | 7.79 |
| 21 Mar 2024, 12:11 | 7.8 | 7.8 |
| 26 Feb 2024, 09:28 | 7.77 | 7.77 |
| 31 Jan 2024, 10:59 | 7.59 | 7.59 |
| 13 Dec 2023, 09:29 | 7.58 | 7.58 |
| 27 Nov 2023, 14:34 | 7.64 | 7.64 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.39 mg/l
Sampled 19 Aug 2026, 43 days ago · 28 results banked
Every result (28)
| Sampled | Result as published | Reads as |
|---|---|---|
| 19 Aug 2026, 11:23 | 0.39 | 0.39 mg/l |
| 10 Jun 2026, 12:00 | 1.3 | 1.3 mg/l |
| 11 May 2026, 13:33 | 0.24 | 0.24 mg/l |
| 24 Mar 2026, 11:27 | 0.46 | 0.46 mg/l |
| 25 Feb 2026, 12:54 | 1.8 | 1.8 mg/l |
| 14 Jan 2026, 13:25 | 0.31 | 0.31 mg/l |
| 3 Dec 2025, 14:08 | 14 | 14 mg/l |
| 4 Nov 2025, 14:32 | 4.7 | 4.7 mg/l |
| 20 Oct 2025, 13:12 | 5 | 5 mg/l |
| 21 Aug 2025, 14:59 | 0.21 | 0.21 mg/l |
| 7 Jul 2025, 11:01 | 5.4 | 5.4 mg/l |
| 27 May 2025, 13:58 | 9.2 | 9.2 mg/l |
| 16 Apr 2025, 10:19 | 0.12 | 0.12 mg/l |
| 13 Mar 2025, 12:44 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Feb 2025, 08:37 | 0.11 | 0.11 mg/l |
| 29 Jan 2025, 12:39 | 0.099 | 0.099 mg/l |
| 9 Dec 2024, 09:44 | 0.072 | 0.072 mg/l |
| 28 Nov 2024, 11:47 | 0.075 | 0.075 mg/l |
| 28 Oct 2024, 13:52 | 0.24 | 0.24 mg/l |
| 26 Sep 2024, 11:30 | 0.14 | 0.14 mg/l |
| 29 Aug 2024, 11:09 | 3 | 3 mg/l |
| 30 Jul 2024, 09:45 | 0.28 | 0.28 mg/l |
| 27 Jun 2024, 12:20 | 0.27 | 0.27 mg/l |
| 30 May 2024, 12:10 | 0.27 | 0.27 mg/l |
| 21 Mar 2024, 12:11 | 5.2 | 5.2 mg/l |
| 26 Feb 2024, 09:28 | 0.082 | 0.082 mg/l |
| 13 Dec 2023, 09:29 | 0.17 | 0.17 mg/l |
| 27 Nov 2023, 14:34 | 3.3 | 3.3 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
13.7 mg/l
Sampled 19 Aug 2026, 43 days ago · 29 results banked
Every result (29)
| Sampled | Result as published | Reads as |
|---|---|---|
| 19 Aug 2026, 11:23 | 13.7 | 13.7 mg/l |
| 10 Jun 2026, 12:00 | 16.7 | 16.7 mg/l |
| 11 May 2026, 13:33 | 11.6 | 11.6 mg/l |
| 24 Mar 2026, 11:27 | 1.27 | 1.27 mg/l |
| 25 Feb 2026, 12:54 | 3.15 | 3.15 mg/l |
| 14 Jan 2026, 13:25 | 3.28 | 3.28 mg/l |
| 3 Dec 2025, 14:08 | 16.8 | 16.8 mg/l |
| 4 Nov 2025, 14:32 | 4.91 | 4.91 mg/l |
| 20 Oct 2025, 13:12 | 5.5 | 5.5 mg/l |
| 21 Aug 2025, 14:59 | 8.53 | 8.53 mg/l |
| 7 Jul 2025, 11:01 | 19.8 | 19.8 mg/l |
| 27 May 2025, 13:58 | 18.9 | 18.9 mg/l |
| 16 Apr 2025, 10:19 | 0.312 | 0.312 mg/l |
| 13 Mar 2025, 12:44 | <0.196 | below 0.196 mg/l (not detected above this) |
| 19 Feb 2025, 08:37 | 0.918 | 0.918 mg/l |
| 29 Jan 2025, 12:39 | 2.58 | 2.58 mg/l |
| 9 Dec 2024, 09:44 | 1.29 | 1.29 mg/l |
| 28 Nov 2024, 11:47 | 0.862 | 0.862 mg/l |
| 28 Oct 2024, 13:52 | 1.04 | 1.04 mg/l |
| 26 Sep 2024, 11:30 | 4.84 | 4.84 mg/l |
| 29 Aug 2024, 11:09 | 6.14 | 6.14 mg/l |
| 30 Jul 2024, 09:45 | 4.79 | 4.79 mg/l |
| 27 Jun 2024, 12:20 | 8.43 | 8.43 mg/l |
| 30 May 2024, 12:10 | 0.901 | 0.901 mg/l |
| 21 Mar 2024, 12:11 | 9.85 | 9.85 mg/l |
| 26 Feb 2024, 09:28 | 1.19 | 1.19 mg/l |
| 31 Jan 2024, 10:59 | 13.9 | 13.9 mg/l |
| 13 Dec 2023, 09:29 | 1.37 | 1.37 mg/l |
| 27 Nov 2023, 14:34 | 8.63 | 8.63 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.19 mg/l
Sampled 19 Aug 2026, 43 days ago · 29 results banked
Every result (29)
| Sampled | Result as published | Reads as |
|---|---|---|
| 19 Aug 2026, 11:23 | 0.19 | 0.19 mg/l |
| 10 Jun 2026, 12:00 | 0.35 | 0.35 mg/l |
| 11 May 2026, 13:33 | 0.33 | 0.33 mg/l |
| 24 Mar 2026, 11:27 | 0.3 | 0.3 mg/l |
| 25 Feb 2026, 12:54 | 0.41 | 0.41 mg/l |
| 14 Jan 2026, 13:25 | 0.23 | 0.23 mg/l |
| 3 Dec 2025, 14:08 | 0.92 | 0.92 mg/l |
| 4 Nov 2025, 14:32 | 2.9 | 2.9 mg/l |
| 20 Oct 2025, 13:12 | 1.3 | 1.3 mg/l |
| 21 Aug 2025, 14:59 | 0.29 | 0.29 mg/l |
| 7 Jul 2025, 11:01 | 0.71 | 0.71 mg/l |
| 27 May 2025, 13:58 | 1.2 | 1.2 mg/l |
| 16 Apr 2025, 10:19 | 0.74 | 0.74 mg/l |
| 13 Mar 2025, 12:44 | 0.3 | 0.3 mg/l |
| 19 Feb 2025, 08:37 | 0.37 | 0.37 mg/l |
| 29 Jan 2025, 12:39 | 0.21 | 0.21 mg/l |
| 9 Dec 2024, 09:44 | 0.56 | 0.56 mg/l |
| 28 Nov 2024, 11:47 | 0.51 | 0.51 mg/l |
| 28 Oct 2024, 13:52 | 0.48 | 0.48 mg/l |
| 26 Sep 2024, 11:30 | 0.36 | 0.36 mg/l |
| 29 Aug 2024, 11:09 | 1.4 | 1.4 mg/l |
| 30 Jul 2024, 09:45 | 0.45 | 0.45 mg/l |
| 27 Jun 2024, 12:20 | 0.12 | 0.12 mg/l |
| 30 May 2024, 12:10 | 0.74 | 0.74 mg/l |
| 21 Mar 2024, 12:11 | 0.78 | 0.78 mg/l |
| 26 Feb 2024, 09:28 | 0.19 | 0.19 mg/l |
| 31 Jan 2024, 10:59 | 0.75 | 0.75 mg/l |
| 13 Dec 2023, 09:29 | 0.19 | 0.19 mg/l |
| 27 Nov 2023, 14:34 | 0.49 | 0.49 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
841 µS/cm
Sampled 19 Aug 2026, 43 days ago · 29 results banked
Every result (29)
| Sampled | Result as published | Reads as |
|---|---|---|
| 19 Aug 2026, 11:23 | 841 | 841 µS/cm |
| 10 Jun 2026, 12:00 | 908 | 908 µS/cm |
| 11 May 2026, 13:33 | 2264 | 2264 µS/cm |
| 24 Mar 2026, 11:27 | 4366 | 4366 µS/cm |
| 25 Feb 2026, 12:54 | 4301 | 4301 µS/cm |
| 14 Jan 2026, 13:25 | 4082 | 4082 µS/cm |
| 3 Dec 2025, 14:08 | 2363 | 2363 µS/cm |
| 4 Nov 2025, 14:32 | 6498 | 6498 µS/cm |
| 20 Oct 2025, 13:12 | 4892 | 4892 µS/cm |
| 21 Aug 2025, 14:59 | 769 | 769 µS/cm |
| 7 Jul 2025, 11:01 | 892 | 892 µS/cm |
| 27 May 2025, 13:58 | 2484 | 2484 µS/cm |
| 16 Apr 2025, 10:19 | 5860 | 5860 µS/cm |
| 13 Mar 2025, 12:44 | 4286 | 4286 µS/cm |
| 19 Feb 2025, 08:37 | 3426 | 3426 µS/cm |
| 29 Jan 2025, 12:39 | 2422 | 2422 µS/cm |
| 9 Dec 2024, 09:44 | 2032 | 2032 µS/cm |
| 28 Nov 2024, 11:47 | 3091 | 3091 µS/cm |
| 28 Oct 2024, 13:52 | 1854 | 1854 µS/cm |
| 26 Sep 2024, 11:30 | 1322 | 1322 µS/cm |
| 29 Aug 2024, 11:09 | 5402 | 5402 µS/cm |
| 30 Jul 2024, 09:45 | 1960 | 1960 µS/cm |
| 27 Jun 2024, 12:20 | 1160 | 1160 µS/cm |
| 30 May 2024, 12:10 | 3654 | 3654 µS/cm |
| 21 Mar 2024, 12:11 | 3309 | 3309 µS/cm |
| 26 Feb 2024, 09:28 | 3264 | 3264 µS/cm |
| 31 Jan 2024, 10:59 | 2163 | 2163 µS/cm |
| 13 Dec 2023, 09:29 | 2926 | 2926 µS/cm |
| 27 Nov 2023, 14:34 | 2766 | 2766 µS/cm |
Everything measured here
21 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 21 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 29 | Nov 2023 – Aug 2026 | 42.1% 19 Aug 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 29 | Nov 2023 – Aug 2026 | 3.94 mg/l 19 Aug 2026 |
| Temperature of Water 0076 | River water | 29 | Nov 2023 – Aug 2026 | 18.4 °C 19 Aug 2026 |
| pH 0061 | River water | 29 | Nov 2023 – Aug 2026 | 7.5 19 Aug 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 28 | Nov 2023 – Aug 2026 | 0.39 mg/l 19 Aug 2026 |
| Nitrate as N 0117 | River water | 29 | Nov 2023 – Aug 2026 | 13.7 mg/l 19 Aug 2026 |
| Orthophosphate, reactive as P 0180 | River water | 29 | Nov 2023 – Aug 2026 | 0.19 mg/l 19 Aug 2026 |
| Conductivity at 25 C 0077 | River water | 29 | Nov 2023 – Aug 2026 | 841 µS/cm 19 Aug 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 29 | Nov 2023 – Aug 2026 | 110 mg/l 19 Aug 2026 |
| Ammonia un-ionised as N 0119 | River water | 28 | Nov 2023 – Aug 2026 | 0.00424 mg/l 19 Aug 2026 |
| BOD : 5 Day ATU 0085 | River water | 24 | Feb 2024 – Aug 2026 | below 3 mg/l 19 Aug 2026 |
| Calcium 0241 | River water | 1 | Jan 2024 – Jan 2024 | 170 mg/l 31 Jan 2024 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 1 | Jan 2024 – Jan 2024 | 15 mg/l 31 Jan 2024 |
| Chloride 0172 | River water | 13 | Apr 2025 – Aug 2026 | 83 mg/l 19 Aug 2026 |
| Hardness, Total as CaCO3 0158 | River water | 1 | Jan 2024 – Jan 2024 | 618 mg/l 31 Jan 2024 |
| Magnesium 0237 | River water | 1 | Jan 2024 – Jan 2024 | 47 mg/l 31 Jan 2024 |
| Nitrite as N 0118 | River water | 29 | Nov 2023 – Aug 2026 | 0.35 mg/l 19 Aug 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 29 | Nov 2023 – Aug 2026 | 14 mg/l 19 Aug 2026 |
| Solids, Suspended at 105 C 0135 | River water | 13 | Apr 2025 – Aug 2026 | below 3 mg/l 19 Aug 2026 |
| Zinc 6455 | River water | 1 | Jan 2024 – Jan 2024 | 28 µg/l 31 Jan 2024 |
| Zinc, Dissolved 3408 | River water | 1 | Jan 2024 – Jan 2024 | 16 µg/l 31 Jan 2024 |
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.