Mill Stream downstream of Horsepool
EA name: MILL STREAM D/S HORSEPOOL (also listed as “MILL STREAM DOWNSTREAM HORSEPOOL”)
Environment Agency sampling point SW-50040755 · 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, 09:3727 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 30 since 16 Oct 2023 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Planned investigation (local monitoring)
- Where
- National Grid 357878, 84623As published, to the nearest 1 m. Open in a map
- River, by its own name
- Mill Stream
- River, by the map
- Mill StreamPlaced on the river its name gives, 234 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) (16 samples)
Planned investigation (local monitoring) (12 samples)
Environmental monitoring statutory (EU directives) (2 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
94.5%
Sampled 4 Sep 2026, 27 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 09:37 | 94.5 | 94.5% |
| 10 Aug 2026, 10:32 | 99.1 | 99.1% |
| 22 Jul 2026, 11:26 | 97.8 | 97.8% |
| 29 Jun 2026, 11:05 | 96 | 96% |
| 6 May 2026, 12:44 | 93.6 | 93.6% |
| 16 Apr 2026, 14:39 | 102.7 | 102.7% |
| 12 Mar 2026, 13:08 | 95.2 | 95.2% |
| 5 Feb 2026, 12:09 | 97 | 97% |
| 15 Jan 2026, 11:10 | 97 | 97% |
| 17 Dec 2025, 12:00 | 96.5 | 96.5% |
| 25 Nov 2025, 12:25 | 86.6 | 86.6% |
| 2 Oct 2025, 12:13 | 97.1 | 97.1% |
| 11 Sep 2025, 12:40 | 95.2 | 95.2% |
| 21 Aug 2025, 10:52 | 95.1 | 95.1% |
| 23 Jul 2025, 11:18 | 93.8 | 93.8% |
| 24 Jun 2025, 10:45 | 96.5 | 96.5% |
| 30 May 2025, 10:07 | 94.7 | 94.7% |
| 3 Apr 2025, 11:28 | 103.7 | 103.7% |
| 5 Mar 2025, 13:38 | 98.9 | 98.9% |
| 18 Feb 2025, 11:04 | 99.3 | 99.3% |
| 9 Dec 2024, 08:32 | 91.1 | 91.1% |
| 11 Nov 2024, 11:14 | 87.5 | 87.5% |
| 11 Oct 2024, 10:12 | 84.9 | 84.9% |
| 6 Sep 2024, 12:33 | 98.4 | 98.4% |
| 7 Aug 2024, 12:44 | 97.3 | 97.3% |
| 3 Jul 2024, 14:01 | 95.2 | 95.2% |
| 13 Jun 2024, 12:14 | 95.6 | 95.6% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.02 mg/l
Sampled 4 Sep 2026, 27 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 09:37 | 9.02 | 9.02 mg/l |
| 10 Aug 2026, 10:32 | 9.55 | 9.55 mg/l |
| 22 Jul 2026, 11:26 | 9.35 | 9.35 mg/l |
| 29 Jun 2026, 11:05 | 9.16 | 9.16 mg/l |
| 6 May 2026, 12:44 | 9.75 | 9.75 mg/l |
| 16 Apr 2026, 14:39 | 10.6 | 10.6 mg/l |
| 12 Mar 2026, 13:08 | 10.7 | 10.7 mg/l |
| 5 Feb 2026, 12:09 | 11.1 | 11.1 mg/l |
| 15 Jan 2026, 11:10 | 11.3 | 11.3 mg/l |
| 17 Dec 2025, 12:00 | 11 | 11 mg/l |
| 25 Nov 2025, 12:25 | 10.3 | 10.3 mg/l |
| 2 Oct 2025, 12:13 | 10.1 | 10.1 mg/l |
| 11 Sep 2025, 12:40 | 9.53 | 9.53 mg/l |
| 21 Aug 2025, 10:52 | 9.5 | 9.5 mg/l |
| 23 Jul 2025, 11:18 | 9.02 | 9.02 mg/l |
| 24 Jun 2025, 10:45 | 9.32 | 9.32 mg/l |
| 30 May 2025, 10:07 | 9.36 | 9.36 mg/l |
| 3 Apr 2025, 11:28 | 11.4 | 11.4 mg/l |
| 5 Mar 2025, 13:38 | 11.9 | 11.9 mg/l |
| 18 Feb 2025, 11:04 | 12.3 | 12.3 mg/l |
| 9 Dec 2024, 08:32 | 10.8 | 10.8 mg/l |
| 11 Nov 2024, 11:14 | 9.47 | 9.47 mg/l |
| 11 Oct 2024, 10:12 | 9.15 | 9.15 mg/l |
| 6 Sep 2024, 12:33 | 9.75 | 9.75 mg/l |
| 7 Aug 2024, 12:44 | 9.11 | 9.11 mg/l |
| 3 Jul 2024, 14:01 | 9.31 | 9.31 mg/l |
| 13 Jun 2024, 12:14 | 9.98 | 9.98 mg/l |
Water temperature
code 0076 · °C
17.5 °C
Sampled 4 Sep 2026, 27 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 09:37 | 17.5 | 17.5 °C |
| 10 Aug 2026, 10:32 | 17 | 17 °C |
| 22 Jul 2026, 11:26 | 17.4 | 17.4 °C |
| 29 Jun 2026, 11:05 | 17.5 | 17.5 °C |
| 6 May 2026, 12:44 | 13.4 | 13.4 °C |
| 16 Apr 2026, 14:39 | 13.9 | 13.9 °C |
| 12 Mar 2026, 13:08 | 10.1 | 10.1 °C |
| 5 Feb 2026, 12:09 | 9.4 | 9.4 °C |
| 15 Jan 2026, 11:10 | 8.6 | 8.6 °C |
| 17 Dec 2025, 12:00 | 9.6 | 9.6 °C |
| 25 Nov 2025, 12:25 | 7.8 | 7.8 °C |
| 2 Oct 2025, 12:13 | 13.5 | 13.5 °C |
| 11 Sep 2025, 12:40 | 15.2 | 15.2 °C |
| 21 Aug 2025, 10:52 | 15.3 | 15.3 °C |
| 23 Jul 2025, 11:18 | 17.1 | 17.1 °C |
| 24 Jun 2025, 10:45 | 16.9 | 16.9 °C |
| 30 May 2025, 10:07 | 15.8 | 15.8 °C |
| 3 Apr 2025, 11:28 | 11.2 | 11.2 °C |
| 5 Mar 2025, 13:38 | 7.3 | 7.3 °C |
| 18 Feb 2025, 11:04 | 6.2 | 6.2 °C |
| 9 Dec 2024, 08:32 | 7.9 | 7.9 °C |
| 11 Nov 2024, 11:14 | 11.7 | 11.7 °C |
| 11 Oct 2024, 10:12 | 11.9 | 11.9 °C |
| 6 Sep 2024, 12:33 | 15.7 | 15.7 °C |
| 7 Aug 2024, 12:44 | 18.4 | 18.4 °C |
| 3 Jul 2024, 14:01 | 16.3 | 16.3 °C |
| 13 Jun 2024, 12:14 | 13.3 | 13.3 °C |
pH
code 0061
8.08
Sampled 4 Sep 2026, 27 days ago · 30 results banked
Every result (30)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 09:37 | 8.08 | 8.08 |
| 10 Aug 2026, 10:32 | 8.05 | 8.05 |
| 22 Jul 2026, 11:26 | 8.15 | 8.15 |
| 29 Jun 2026, 11:05 | 8.11 | 8.11 |
| 6 May 2026, 12:44 | 8.13 | 8.13 |
| 16 Apr 2026, 14:39 | 8.3 | 8.3 |
| 12 Mar 2026, 13:08 | 8.14 | 8.14 |
| 5 Feb 2026, 12:09 | 8.09 | 8.09 |
| 15 Jan 2026, 11:10 | 8.22 | 8.22 |
| 17 Dec 2025, 12:00 | 8.08 | 8.08 |
| 25 Nov 2025, 12:25 | 7.88 | 7.88 |
| 2 Oct 2025, 12:13 | 8.17 | 8.17 |
| 11 Sep 2025, 12:40 | 8.18 | 8.18 |
| 21 Aug 2025, 10:52 | 8.23 | 8.23 |
| 23 Jul 2025, 11:18 | 8.1 | 8.1 |
| 24 Jun 2025, 10:45 | 8.24 | 8.24 |
| 30 May 2025, 10:07 | 8.15 | 8.15 |
| 3 Apr 2025, 11:28 | 8.2 | 8.2 |
| 5 Mar 2025, 13:38 | 8.17 | 8.17 |
| 18 Feb 2025, 11:04 | 8.17 | 8.17 |
| 9 Dec 2024, 08:32 | 8 | 8 |
| 11 Nov 2024, 11:14 | 8.01 | 8.01 |
| 11 Oct 2024, 10:12 | 7.91 | 7.91 |
| 6 Sep 2024, 12:33 | 8.28 | 8.28 |
| 7 Aug 2024, 12:44 | 8.11 | 8.11 |
| 3 Jul 2024, 14:01 | 8.3 | 8.3 |
| 13 Jun 2024, 12:14 | 8.27 | 8.27 |
| 3 Apr 2024, 12:13 | 8.08 | 8.08 |
| 11 Jan 2024, 11:55 | 8.53 | 8.53 |
| 16 Oct 2023, 11:47 | 8.1 | 8.1 |
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 · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 09:37 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Aug 2026, 10:32 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Jul 2026, 11:26 | <0.03 | below 0.03 mg/l (not detected above this) |
| 29 Jun 2026, 11:05 | 0.039 | 0.039 mg/l |
| 6 May 2026, 12:44 | 0.17 | 0.17 mg/l |
| 16 Apr 2026, 14:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Mar 2026, 13:08 | 0.12 | 0.12 mg/l |
| 5 Feb 2026, 12:09 | 0.14 | 0.14 mg/l |
| 15 Jan 2026, 11:10 | 0.086 | 0.086 mg/l |
| 17 Dec 2025, 12:00 | 0.088 | 0.088 mg/l |
| 25 Nov 2025, 12:25 | 0.044 | 0.044 mg/l |
| 2 Oct 2025, 12:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Sep 2025, 12:40 | 0.037 | 0.037 mg/l |
| 21 Aug 2025, 10:52 | 0.034 | 0.034 mg/l |
| 23 Jul 2025, 11:18 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Jun 2025, 10:45 | <0.03 | below 0.03 mg/l (not detected above this) |
| 30 May 2025, 10:07 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Mar 2025, 13:38 | 0.043 | 0.043 mg/l |
| 18 Feb 2025, 11:04 | 0.067 | 0.067 mg/l |
| 11 Nov 2024, 11:14 | 0.14 | 0.14 mg/l |
| 11 Oct 2024, 10:12 | 0.11 | 0.11 mg/l |
| 6 Sep 2024, 12:33 | 0.08 | 0.08 mg/l |
| 7 Aug 2024, 12:44 | 0.047 | 0.047 mg/l |
| 3 Jul 2024, 14:01 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Jun 2024, 12:14 | 0.096 | 0.096 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
12 mg/l
Sampled 4 Sep 2026, 27 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 09:37 | 12 | 12 mg/l |
| 10 Aug 2026, 10:32 | 11 | 11 mg/l |
| 22 Jul 2026, 11:26 | 11 | 11 mg/l |
| 29 Jun 2026, 11:05 | 10.9 | 10.9 mg/l |
| 6 May 2026, 12:44 | 8.36 | 8.36 mg/l |
| 16 Apr 2026, 14:39 | 7.68 | 7.68 mg/l |
| 12 Mar 2026, 13:08 | 5.94 | 5.94 mg/l |
| 5 Feb 2026, 12:09 | 3.98 | 3.98 mg/l |
| 15 Jan 2026, 11:10 | 3.49 | 3.49 mg/l |
| 17 Dec 2025, 12:00 | 5.09 | 5.09 mg/l |
| 25 Nov 2025, 12:25 | 6.08 | 6.08 mg/l |
| 2 Oct 2025, 12:13 | 9.98 | 9.98 mg/l |
| 11 Sep 2025, 12:40 | 6.66 | 6.66 mg/l |
| 21 Aug 2025, 10:52 | 9.65 | 9.65 mg/l |
| 23 Jul 2025, 11:18 | 9.96 | 9.96 mg/l |
| 24 Jun 2025, 10:45 | 9.73 | 9.73 mg/l |
| 30 May 2025, 10:07 | 9.96 | 9.96 mg/l |
| 5 Mar 2025, 13:38 | 6.49 | 6.49 mg/l |
| 18 Feb 2025, 11:04 | 7.37 | 7.37 mg/l |
| 9 Dec 2024, 08:32 | 4.43 | 4.43 mg/l |
| 11 Nov 2024, 11:14 | 8.09 | 8.09 mg/l |
| 11 Oct 2024, 10:12 | 4.45 | 4.45 mg/l |
| 6 Sep 2024, 12:33 | 4.97 | 4.97 mg/l |
| 7 Aug 2024, 12:44 | 10.9 | 10.9 mg/l |
| 3 Jul 2024, 14:01 | 9.36 | 9.36 mg/l |
| 13 Jun 2024, 12:14 | 9.39 | 9.39 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.12 mg/l
Sampled 4 Sep 2026, 27 days ago · 26 results banked
Every result (26)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 09:37 | 0.12 | 0.12 mg/l |
| 10 Aug 2026, 10:32 | 0.064 | 0.064 mg/l |
| 22 Jul 2026, 11:26 | 0.073 | 0.073 mg/l |
| 29 Jun 2026, 11:05 | 0.06 | 0.06 mg/l |
| 6 May 2026, 12:44 | 0.071 | 0.071 mg/l |
| 16 Apr 2026, 14:39 | 0.094 | 0.094 mg/l |
| 12 Mar 2026, 13:08 | 0.15 | 0.15 mg/l |
| 5 Feb 2026, 12:09 | 0.17 | 0.17 mg/l |
| 15 Jan 2026, 11:10 | 0.14 | 0.14 mg/l |
| 17 Dec 2025, 12:00 | 0.14 | 0.14 mg/l |
| 25 Nov 2025, 12:25 | 0.11 | 0.11 mg/l |
| 2 Oct 2025, 12:13 | 0.13 | 0.13 mg/l |
| 11 Sep 2025, 12:40 | 0.13 | 0.13 mg/l |
| 21 Aug 2025, 10:52 | 0.091 | 0.091 mg/l |
| 23 Jul 2025, 11:18 | 0.075 | 0.075 mg/l |
| 24 Jun 2025, 10:45 | 0.052 | 0.052 mg/l |
| 30 May 2025, 10:07 | 0.095 | 0.095 mg/l |
| 5 Mar 2025, 13:38 | 0.072 | 0.072 mg/l |
| 18 Feb 2025, 11:04 | 0.062 | 0.062 mg/l |
| 9 Dec 2024, 08:32 | 0.32 | 0.32 mg/l |
| 11 Nov 2024, 11:14 | 0.3 | 0.3 mg/l |
| 11 Oct 2024, 10:12 | 0.12 | 0.12 mg/l |
| 6 Sep 2024, 12:33 | 0.15 | 0.15 mg/l |
| 7 Aug 2024, 12:44 | 0.044 | 0.044 mg/l |
| 3 Jul 2024, 14:01 | 0.035 | 0.035 mg/l |
| 13 Jun 2024, 12:14 | 0.036 | 0.036 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
740 µS/cm
Sampled 4 Sep 2026, 27 days ago · 27 results banked
Every result (27)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 09:37 | 740 | 740 µS/cm |
| 10 Aug 2026, 10:32 | 697 | 697 µS/cm |
| 22 Jul 2026, 11:26 | 667 | 667 µS/cm |
| 29 Jun 2026, 11:05 | 710 | 710 µS/cm |
| 6 May 2026, 12:44 | 717 | 717 µS/cm |
| 16 Apr 2026, 14:39 | 695 | 695 µS/cm |
| 12 Mar 2026, 13:08 | 680 | 680 µS/cm |
| 5 Feb 2026, 12:09 | 546 | 546 µS/cm |
| 15 Jan 2026, 11:10 | 559 | 559 µS/cm |
| 17 Dec 2025, 12:00 | 620 | 620 µS/cm |
| 25 Nov 2025, 12:25 | 668 | 668 µS/cm |
| 2 Oct 2025, 12:13 | 700 | 700 µS/cm |
| 11 Sep 2025, 12:40 | 655 | 655 µS/cm |
| 21 Aug 2025, 10:52 | 659 | 659 µS/cm |
| 23 Jul 2025, 11:18 | 647 | 647 µS/cm |
| 24 Jun 2025, 10:45 | 679 | 679 µS/cm |
| 30 May 2025, 10:07 | 716 | 716 µS/cm |
| 3 Apr 2025, 11:28 | 736 | 736 µS/cm |
| 5 Mar 2025, 13:38 | 713 | 713 µS/cm |
| 18 Feb 2025, 11:04 | 734 | 734 µS/cm |
| 9 Dec 2024, 08:32 | 715 | 715 µS/cm |
| 11 Nov 2024, 11:14 | 780 | 780 µS/cm |
| 11 Oct 2024, 10:12 | 611 | 611 µS/cm |
| 6 Sep 2024, 12:33 | 607 | 607 µS/cm |
| 7 Aug 2024, 12:44 | 713 | 713 µS/cm |
| 3 Jul 2024, 14:01 | 700 | 700 µS/cm |
| 13 Jun 2024, 12:14 | 762 | 762 µS/cm |
Everything measured here
17 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 17 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 27 | Jun 2024 – Sep 2026 | 94.5% 4 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 27 | Jun 2024 – Sep 2026 | 9.02 mg/l 4 Sep 2026 |
| Temperature of Water 0076 | River water | 27 | Jun 2024 – Sep 2026 | 17.5 °C 4 Sep 2026 |
| pH 0061 | River water | 30 | Oct 2023 – Sep 2026 | 8.08 4 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 25 | Jun 2024 – Sep 2026 | below 0.03 mg/l 4 Sep 2026 |
| Nitrate as N 0117 | River water | 26 | Jun 2024 – Sep 2026 | 12 mg/l 4 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 26 | Jun 2024 – Sep 2026 | 0.12 mg/l 4 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 27 | Jun 2024 – Sep 2026 | 740 µS/cm 4 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 26 | Jun 2024 – Sep 2026 | 190 mg/l 4 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 25 | Jun 2024 – Sep 2026 | below 0.00094 mg/l 4 Sep 2026 |
| Calcium, Dissolved 0239 | River water | 11 | Oct 2023 – Jul 2026 | 100 mg/l 22 Jul 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 10 | Oct 2023 – Jul 2026 | 1.8 mg/l 22 Jul 2026 |
| Iron, Dissolved 6460 | River water | 11 | Oct 2023 – Jul 2026 | below 30 µg/l 22 Jul 2026 |
| Magnesium, Dissolved 0235 | River water | 11 | Oct 2023 – Jul 2026 | 5.4 mg/l 22 Jul 2026 |
| Nitrite as N 0118 | River water | 26 | Jun 2024 – Sep 2026 | 0.016 mg/l 4 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 26 | Jun 2024 – Sep 2026 | 12 mg/l 4 Sep 2026 |
| Solids, Suspended at 105 C 0135 | River water | 6 | Apr 2026 – Sep 2026 | 16 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.