Hornsmill Brook at Hornsmill Bridge
EA name: HORNSMILL BROOK AT HORNSMILL BRIDGE
Environment Agency sampling point NW-88000584 · 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
- 27 Aug 2026, 12:2035 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 26 since 17 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 348085, 374102As published, to the nearest 1 m. Open in a map
- River, by its own name
- Hornsmill Brook
- River, by the map
- Hornsmill BrookPlaced on the river its name gives, 28 m from the line.
- Next gauge downstream
- None tracedIts water reaches the sea without passing a gauge.
- Why it was sampled
- Monitoring (national agency policy) (21 samples)
Environmental monitoring statutory (EU directives) (5 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
75.7%
Sampled 27 Aug 2026, 35 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 27 Aug 2026, 12:20 | 75.7 | 75.7% |
| 14 Jul 2026, 10:39 | 85.3 | 85.3% |
| 29 Jun 2026, 09:33 | 83.5 | 83.5% |
| 22 May 2026, 12:15 | 86.4 | 86.4% |
| 17 Apr 2026, 12:04 | 89.1 | 89.1% |
| 23 Mar 2026, 13:32 | 90.6 | 90.6% |
| 27 Feb 2026, 11:35 | 93.2 | 93.2% |
| 14 Jan 2026, 09:34 | 91.3 | 91.3% |
| 12 Mar 2025, 12:19 | 96.1 | 96.1% |
| 17 Feb 2025, 13:42 | 95.5 | 95.5% |
| 21 Jan 2025, 13:46 | 94.5 | 94.5% |
| 6 Dec 2024, 12:41 | 94 | 94% |
| 20 Nov 2024, 13:07 | 94.2 | 94.2% |
| 14 Oct 2024, 13:59 | 89.6 | 89.6% |
| 16 Sep 2024, 09:27 | 89.4 | 89.4% |
| 28 Aug 2024, 13:35 | 79.8 | 79.8% |
| 18 Jul 2024, 09:15 | 86 | 86% |
| 17 Jun 2024, 13:17 | 84.5 | 84.5% |
| 14 May 2024, 13:57 | 76.4 | 76.4% |
| 17 Apr 2024, 13:32 | 87.5 | 87.5% |
| 18 Mar 2024, 09:53 | 90.2 | 90.2% |
| 26 Feb 2024, 09:55 | 93.8 | 93.8% |
| 18 Jan 2024, 11:44 | 94.9 | 94.9% |
| 4 Dec 2023, 10:58 | 94 | 94% |
| 21 Nov 2023, 13:59 | 91.1 | 91.1% |
| 17 Oct 2023, 12:34 | 90.6 | 90.6% |
Dissolved oxygen
as O2 · code 9924 · mg/l
7.53 mg/l
Sampled 27 Aug 2026, 35 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 27 Aug 2026, 12:20 | 7.53 | 7.53 mg/l |
| 14 Jul 2026, 10:39 | 8.59 | 8.59 mg/l |
| 29 Jun 2026, 09:33 | 8.5 | 8.5 mg/l |
| 22 May 2026, 12:15 | 8.84 | 8.84 mg/l |
| 17 Apr 2026, 12:04 | 9.8 | 9.8 mg/l |
| 23 Mar 2026, 13:32 | 10.6 | 10.6 mg/l |
| 27 Feb 2026, 11:35 | 10.8 | 10.8 mg/l |
| 14 Jan 2026, 09:34 | 12 | 12 mg/l |
| 12 Mar 2025, 12:19 | 11.9 | 11.9 mg/l |
| 17 Feb 2025, 13:42 | 11.8 | 11.8 mg/l |
| 21 Jan 2025, 13:46 | 11.8 | 11.8 mg/l |
| 6 Dec 2024, 12:41 | 11.2 | 11.2 mg/l |
| 20 Nov 2024, 13:07 | 11.6 | 11.6 mg/l |
| 14 Oct 2024, 13:59 | 10.2 | 10.2 mg/l |
| 16 Sep 2024, 09:27 | 9.59 | 9.59 mg/l |
| 28 Aug 2024, 13:35 | 8.13 | 8.13 mg/l |
| 18 Jul 2024, 09:15 | 8.73 | 8.73 mg/l |
| 17 Jun 2024, 13:17 | 8.78 | 8.78 mg/l |
| 14 May 2024, 13:57 | 7.84 | 7.84 mg/l |
| 17 Apr 2024, 13:32 | 9.81 | 9.81 mg/l |
| 18 Mar 2024, 09:53 | 10.6 | 10.6 mg/l |
| 26 Feb 2024, 09:55 | 11.9 | 11.9 mg/l |
| 18 Jan 2024, 11:44 | 13.1 | 13.1 mg/l |
| 4 Dec 2023, 10:58 | 12 | 12 mg/l |
| 21 Nov 2023, 13:59 | 10.4 | 10.4 mg/l |
| 17 Oct 2023, 12:34 | 10 | 10 mg/l |
Water temperature
code 0076 · °C
15.5 °C
Sampled 27 Aug 2026, 35 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 27 Aug 2026, 12:20 | 15.5 | 15.5 °C |
| 14 Jul 2026, 10:39 | 14.9 | 14.9 °C |
| 29 Jun 2026, 09:33 | 14.4 | 14.4 °C |
| 22 May 2026, 12:15 | 14.2 | 14.2 °C |
| 17 Apr 2026, 12:04 | 11 | 11 °C |
| 23 Mar 2026, 13:32 | 8.5 | 8.5 °C |
| 27 Feb 2026, 11:35 | 8.9 | 8.9 °C |
| 14 Jan 2026, 09:34 | 3.7 | 3.7 °C |
| 12 Mar 2025, 12:19 | 6.3 | 6.3 °C |
| 17 Feb 2025, 13:42 | 6.2 | 6.2 °C |
| 21 Jan 2025, 13:46 | 5.9 | 5.9 °C |
| 6 Dec 2024, 12:41 | 7.6 | 7.6 °C |
| 20 Nov 2024, 13:07 | 6.5 | 6.5 °C |
| 14 Oct 2024, 13:59 | 9.7 | 9.7 °C |
| 16 Sep 2024, 09:27 | 12.1 | 12.1 °C |
| 28 Aug 2024, 13:35 | 14.4 | 14.4 °C |
| 18 Jul 2024, 09:15 | 14.6 | 14.6 °C |
| 17 Jun 2024, 13:17 | 13.5 | 13.5 °C |
| 14 May 2024, 13:57 | 14.1 | 14.1 °C |
| 17 Apr 2024, 13:32 | 10.2 | 10.2 °C |
| 18 Mar 2024, 09:53 | 8.1 | 8.1 °C |
| 26 Feb 2024, 09:55 | 5.2 | 5.2 °C |
| 18 Jan 2024, 11:44 | 1.9 | 1.9 °C |
| 4 Dec 2023, 10:58 | 5 | 5 °C |
| 21 Nov 2023, 13:59 | 9.6 | 9.6 °C |
| 17 Oct 2023, 12:34 | 10.7 | 10.7 °C |
pH
code 0061
7.55
Sampled 27 Aug 2026, 35 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 27 Aug 2026, 12:20 | 7.55 | 7.55 |
| 14 Jul 2026, 10:39 | 8.07 | 8.07 |
| 29 Jun 2026, 09:33 | 8.01 | 8.01 |
| 22 May 2026, 12:15 | 7.9 | 7.9 |
| 17 Apr 2026, 12:04 | 7.74 | 7.74 |
| 23 Mar 2026, 13:32 | 7.79 | 7.79 |
| 27 Feb 2026, 11:35 | 7.76 | 7.76 |
| 14 Jan 2026, 09:34 | 7.72 | 7.72 |
| 12 Mar 2025, 12:19 | 7.87 | 7.87 |
| 17 Feb 2025, 13:42 | 7.98 | 7.98 |
| 21 Jan 2025, 13:46 | 7.97 | 7.97 |
| 6 Dec 2024, 12:41 | 7.45 | 7.45 |
| 20 Nov 2024, 13:07 | 7.62 | 7.62 |
| 14 Oct 2024, 13:59 | 7.77 | 7.77 |
| 16 Sep 2024, 09:27 | 7.69 | 7.69 |
| 28 Aug 2024, 13:35 | 7.63 | 7.63 |
| 18 Jul 2024, 09:15 | 7.6 | 7.6 |
| 17 Jun 2024, 13:17 | 7.72 | 7.72 |
| 14 May 2024, 13:57 | 7.65 | 7.65 |
| 17 Apr 2024, 13:32 | 7.73 | 7.73 |
| 18 Mar 2024, 09:53 | 7.84 | 7.84 |
| 26 Feb 2024, 09:55 | 7.78 | 7.78 |
| 18 Jan 2024, 11:44 | 7.7 | 7.7 |
| 4 Dec 2023, 10:58 | 7.46 | 7.46 |
| 21 Nov 2023, 13:59 | 7.66 | 7.66 |
| 17 Oct 2023, 12:34 | 7.65 | 7.65 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.1 mg/l
Sampled 27 Aug 2026, 35 days ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 27 Aug 2026, 12:20 | 0.1 | 0.1 mg/l |
| 14 Jul 2026, 10:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 29 Jun 2026, 09:33 | 0.043 | 0.043 mg/l |
| 22 May 2026, 12:15 | 0.11 | 0.11 mg/l |
| 17 Apr 2026, 12:04 | 0.068 | 0.068 mg/l |
| 23 Mar 2026, 13:32 | 0.086 | 0.086 mg/l |
| 27 Feb 2026, 11:35 | 0.062 | 0.062 mg/l |
| 14 Jan 2026, 09:34 | 0.16 | 0.16 mg/l |
| 12 Mar 2025, 12:19 | 0.15 | 0.15 mg/l |
| 17 Feb 2025, 13:42 | 0.094 | 0.094 mg/l |
| 21 Jan 2025, 13:46 | 0.15 | 0.15 mg/l |
| 20 Nov 2024, 13:07 | 0.14 | 0.14 mg/l |
| 14 Oct 2024, 13:59 | 0.11 | 0.11 mg/l |
| 16 Sep 2024, 09:27 | 0.085 | 0.085 mg/l |
| 28 Aug 2024, 13:35 | 0.069 | 0.069 mg/l |
| 18 Jul 2024, 09:15 | 0.071 | 0.071 mg/l |
| 17 Jun 2024, 13:17 | 0.071 | 0.071 mg/l |
| 14 May 2024, 13:57 | 0.078 | 0.078 mg/l |
| 17 Apr 2024, 13:32 | 0.14 | 0.14 mg/l |
| 18 Mar 2024, 09:53 | 0.16 | 0.16 mg/l |
| 26 Feb 2024, 09:55 | 0.088 | 0.088 mg/l |
| 18 Jan 2024, 11:44 | 0.14 | 0.14 mg/l |
| 4 Dec 2023, 10:58 | 0.3 | 0.3 mg/l |
| 21 Nov 2023, 13:59 | 0.12 | 0.12 mg/l |
| 17 Oct 2023, 12:34 | 0.086 | 0.086 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
8.46 mg/l
Sampled 27 Aug 2026, 35 days ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 27 Aug 2026, 12:20 | 8.46 | 8.46 mg/l |
| 14 Jul 2026, 10:39 | 11 | 11 mg/l |
| 29 Jun 2026, 09:33 | 9.95 | 9.95 mg/l |
| 22 May 2026, 12:15 | 7.54 | 7.54 mg/l |
| 17 Apr 2026, 12:04 | 6.17 | 6.17 mg/l |
| 23 Mar 2026, 13:32 | 6.27 | 6.27 mg/l |
| 27 Feb 2026, 11:35 | 4.67 | 4.67 mg/l |
| 14 Jan 2026, 09:34 | 6.47 | 6.47 mg/l |
| 12 Mar 2025, 12:19 | 6.97 | 6.97 mg/l |
| 17 Feb 2025, 13:42 | 5.88 | 5.88 mg/l |
| 21 Jan 2025, 13:46 | 4.07 | 4.07 mg/l |
| 20 Nov 2024, 13:07 | 3.47 | 3.47 mg/l |
| 14 Oct 2024, 13:59 | 5.26 | 5.26 mg/l |
| 16 Sep 2024, 09:27 | 4.77 | 4.77 mg/l |
| 28 Aug 2024, 13:35 | 9.04 | 9.04 mg/l |
| 18 Jul 2024, 09:15 | 5.17 | 5.17 mg/l |
| 17 Jun 2024, 13:17 | 7.65 | 7.65 mg/l |
| 14 May 2024, 13:57 | 5.43 | 5.43 mg/l |
| 17 Apr 2024, 13:32 | 3.87 | 3.87 mg/l |
| 18 Mar 2024, 09:53 | 3.57 | 3.57 mg/l |
| 26 Feb 2024, 09:55 | 4.27 | 4.27 mg/l |
| 18 Jan 2024, 11:44 | 5.78 | 5.78 mg/l |
| 4 Dec 2023, 10:58 | 2.28 | 2.28 mg/l |
| 21 Nov 2023, 13:59 | 3.07 | 3.07 mg/l |
| 17 Oct 2023, 12:34 | 4.17 | 4.17 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.17 mg/l
Sampled 27 Aug 2026, 35 days ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 27 Aug 2026, 12:20 | 0.17 | 0.17 mg/l |
| 14 Jul 2026, 10:39 | 0.14 | 0.14 mg/l |
| 29 Jun 2026, 09:33 | 0.15 | 0.15 mg/l |
| 22 May 2026, 12:15 | 0.14 | 0.14 mg/l |
| 17 Apr 2026, 12:04 | 0.14 | 0.14 mg/l |
| 23 Mar 2026, 13:32 | 0.11 | 0.11 mg/l |
| 27 Feb 2026, 11:35 | 0.12 | 0.12 mg/l |
| 14 Jan 2026, 09:34 | 0.12 | 0.12 mg/l |
| 12 Mar 2025, 12:19 | 0.094 | 0.094 mg/l |
| 17 Feb 2025, 13:42 | 0.07 | 0.07 mg/l |
| 21 Jan 2025, 13:46 | 0.11 | 0.11 mg/l |
| 20 Nov 2024, 13:07 | 0.16 | 0.16 mg/l |
| 14 Oct 2024, 13:59 | 0.13 | 0.13 mg/l |
| 16 Sep 2024, 09:27 | 0.15 | 0.15 mg/l |
| 28 Aug 2024, 13:35 | 0.14 | 0.14 mg/l |
| 18 Jul 2024, 09:15 | 0.12 | 0.12 mg/l |
| 17 Jun 2024, 13:17 | 0.12 | 0.12 mg/l |
| 14 May 2024, 13:57 | 0.14 | 0.14 mg/l |
| 17 Apr 2024, 13:32 | 0.13 | 0.13 mg/l |
| 18 Mar 2024, 09:53 | 0.084 | 0.084 mg/l |
| 26 Feb 2024, 09:55 | 0.088 | 0.088 mg/l |
| 18 Jan 2024, 11:44 | 0.093 | 0.093 mg/l |
| 4 Dec 2023, 10:58 | 0.13 | 0.13 mg/l |
| 21 Nov 2023, 13:59 | 0.17 | 0.17 mg/l |
| 17 Oct 2023, 12:34 | 0.14 | 0.14 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
762 µS/cm
Sampled 27 Aug 2026, 35 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 27 Aug 2026, 12:20 | 762 | 762 µS/cm |
| 14 Jul 2026, 10:39 | 825 | 825 µS/cm |
| 29 Jun 2026, 09:33 | 819 | 819 µS/cm |
| 22 May 2026, 12:15 | 753 | 753 µS/cm |
| 17 Apr 2026, 12:04 | 643 | 643 µS/cm |
| 23 Mar 2026, 13:32 | 616 | 616 µS/cm |
| 27 Feb 2026, 11:35 | 493 | 493 µS/cm |
| 14 Jan 2026, 09:34 | 492 | 492 µS/cm |
| 12 Mar 2025, 12:19 | 626 | 626 µS/cm |
| 17 Feb 2025, 13:42 | 607 | 607 µS/cm |
| 21 Jan 2025, 13:46 | 493 | 493 µS/cm |
| 6 Dec 2024, 12:41 | 346 | 346 µS/cm |
| 20 Nov 2024, 13:07 | 438 | 438 µS/cm |
| 14 Oct 2024, 13:59 | 587 | 587 µS/cm |
| 16 Sep 2024, 09:27 | 496 | 496 µS/cm |
| 28 Aug 2024, 13:35 | 738 | 738 µS/cm |
| 18 Jul 2024, 09:15 | 542 | 542 µS/cm |
| 17 Jun 2024, 13:17 | 650 | 650 µS/cm |
| 14 May 2024, 13:57 | 578 | 578 µS/cm |
| 17 Apr 2024, 13:32 | 468 | 468 µS/cm |
| 18 Mar 2024, 09:53 | 578 | 578 µS/cm |
| 26 Feb 2024, 09:55 | 475 | 475 µS/cm |
| 18 Jan 2024, 11:44 | 568 | 568 µS/cm |
| 4 Dec 2023, 10:58 | 364 | 364 µS/cm |
| 21 Nov 2023, 13:59 | 463 | 463 µS/cm |
| 17 Oct 2023, 12:34 | 522 | 522 µS/cm |
Everything measured here
15 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 15 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 26 | Oct 2023 – Aug 2026 | 75.7% 27 Aug 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 26 | Oct 2023 – Aug 2026 | 7.53 mg/l 27 Aug 2026 |
| Temperature of Water 0076 | River water | 26 | Oct 2023 – Aug 2026 | 15.5 °C 27 Aug 2026 |
| pH 0061 | River water | 26 | Oct 2023 – Aug 2026 | 7.55 27 Aug 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 25 | Oct 2023 – Aug 2026 | 0.1 mg/l 27 Aug 2026 |
| Nitrate as N 0117 | River water | 25 | Oct 2023 – Aug 2026 | 8.46 mg/l 27 Aug 2026 |
| Orthophosphate, reactive as P 0180 | River water | 25 | Oct 2023 – Aug 2026 | 0.17 mg/l 27 Aug 2026 |
| Conductivity at 25 C 0077 | River water | 26 | Oct 2023 – Aug 2026 | 762 µS/cm 27 Aug 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 25 | Oct 2023 – Aug 2026 | 250 mg/l 27 Aug 2026 |
| Ammonia un-ionised as N 0119 | River water | 25 | Oct 2023 – Aug 2026 | 0.00098 mg/l 27 Aug 2026 |
| BOD : 5 Day ATU 0085 | River water | 21 | Feb 2024 – Aug 2026 | below 5 mg/l 27 Aug 2026 |
| Chloride 0172 | River water | 5 | Apr 2026 – Aug 2026 | 45 mg/l 27 Aug 2026 |
| Nitrite as N 0118 | River water | 25 | Oct 2023 – Aug 2026 | 0.036 mg/l 27 Aug 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 25 | Oct 2023 – Aug 2026 | 8.5 mg/l 27 Aug 2026 |
| Solids, Suspended at 105 C 0135 | River water | 5 | Apr 2026 – Aug 2026 | 43 mg/l 27 Aug 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.