Horsenden Stream at the Ford, Bledlow
EA name: HORSENDEN STREAM AT THE FORD, BLEDLOW
Environment Agency sampling point TH-PTAR0089 · 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 Aug 2026, 11:5945 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 17 since 23 Apr 2025 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 477600, 204000As published, to the nearest 100 m (so up to about 70 m out). Open in a map
- River, by its own name
- Horsenden Stream
- River, by the map
- Horsenden StreamPlaced on the river its name gives, 308 m from the line.
- Next gauge downstream
- None tracedThe map stops before any gauge.
- Why it was sampled
- Environmental monitoring statutory (EU directives) (17 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
92.1%
Sampled 17 Aug 2026, 45 days ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Aug 2026, 11:59 | 92.1 | 92.1% |
| 28 Jul 2026, 13:27 | 91.4 | 91.4% |
| 17 Jun 2026, 10:06 | 94.9 | 94.9% |
| 12 May 2026, 10:10 | 95.3 | 95.3% |
| 24 Apr 2026, 10:16 | 96.5 | 96.5% |
| 6 Mar 2026, 09:15 | 94.7 | 94.7% |
| 4 Feb 2026, 09:54 | 86.2 | 86.2% |
| 9 Jan 2026, 11:06 | 93.9 | 93.9% |
| 8 Dec 2025, 12:35 | 89.7 | 89.7% |
| 24 Nov 2025, 14:21 | 91.1 | 91.1% |
| 30 Oct 2025, 13:18 | 88.2 | 88.2% |
| 22 Sep 2025, 13:01 | 93.1 | 93.1% |
| 11 Aug 2025, 11:29 | 95.3 | 95.3% |
| 2 Jul 2025, 10:55 | 90.2 | 90.2% |
| 11 Jun 2025, 10:19 | 91.7 | 91.7% |
| 21 May 2025, 09:28 | 91.1 | 91.1% |
| 23 Apr 2025, 14:13 | 86.5 | 86.5% |
Dissolved oxygen
as O2 · code 9924 · mg/l
8.7 mg/l
Sampled 17 Aug 2026, 45 days ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Aug 2026, 11:59 | 8.7 | 8.7 mg/l |
| 28 Jul 2026, 13:27 | 8.44 | 8.44 mg/l |
| 17 Jun 2026, 10:06 | 9.13 | 9.13 mg/l |
| 12 May 2026, 10:10 | 11.1 | 11.1 mg/l |
| 24 Apr 2026, 10:16 | 11.3 | 11.3 mg/l |
| 6 Mar 2026, 09:15 | 10.8 | 10.8 mg/l |
| 4 Feb 2026, 09:54 | 10.2 | 10.2 mg/l |
| 9 Jan 2026, 11:06 | 11.7 | 11.7 mg/l |
| 8 Dec 2025, 12:35 | 9.89 | 9.89 mg/l |
| 24 Nov 2025, 14:21 | 10.6 | 10.6 mg/l |
| 30 Oct 2025, 13:18 | 9.77 | 9.77 mg/l |
| 22 Sep 2025, 13:01 | 10 | 10 mg/l |
| 11 Aug 2025, 11:29 | 9.26 | 9.26 mg/l |
| 2 Jul 2025, 10:55 | 8.68 | 8.68 mg/l |
| 11 Jun 2025, 10:19 | 9.43 | 9.43 mg/l |
| 21 May 2025, 09:28 | 9.64 | 9.64 mg/l |
| 23 Apr 2025, 14:13 | 9.39 | 9.39 mg/l |
Water temperature
code 0076 · °C
18 °C
Sampled 17 Aug 2026, 45 days ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Aug 2026, 11:59 | 18 | 18 °C |
| 28 Jul 2026, 13:27 | 19.1 | 19.1 °C |
| 17 Jun 2026, 10:06 | 17.1 | 17.1 °C |
| 12 May 2026, 10:10 | 8.7 | 8.7 °C |
| 24 Apr 2026, 10:16 | 8.5 | 8.5 °C |
| 6 Mar 2026, 09:15 | 9.6 | 9.6 °C |
| 4 Feb 2026, 09:54 | 8.1 | 8.1 °C |
| 9 Jan 2026, 11:06 | 6 | 6 °C |
| 8 Dec 2025, 12:35 | 10.9 | 10.9 °C |
| 24 Nov 2025, 14:21 | 8.6 | 8.6 °C |
| 30 Oct 2025, 13:18 | 10.7 | 10.7 °C |
| 22 Sep 2025, 13:01 | 12 | 12 °C |
| 11 Aug 2025, 11:29 | 16.6 | 16.6 °C |
| 2 Jul 2025, 10:55 | 17.1 | 17.1 °C |
| 11 Jun 2025, 10:19 | 14 | 14 °C |
| 21 May 2025, 09:28 | 12.7 | 12.7 °C |
| 23 Apr 2025, 14:13 | 11.6 | 11.6 °C |
pH
code 0061
8.21
Sampled 17 Aug 2026, 45 days ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Aug 2026, 11:59 | 8.21 | 8.21 |
| 28 Jul 2026, 13:27 | 8.03 | 8.03 |
| 17 Jun 2026, 10:06 | 8.15 | 8.15 |
| 12 May 2026, 10:10 | 8.21 | 8.21 |
| 24 Apr 2026, 10:16 | 8.16 | 8.16 |
| 6 Mar 2026, 09:15 | 8.09 | 8.09 |
| 4 Feb 2026, 09:54 | 7.97 | 7.97 |
| 9 Jan 2026, 11:06 | 8.05 | 8.05 |
| 8 Dec 2025, 12:35 | 8.19 | 8.19 |
| 24 Nov 2025, 14:21 | 8.11 | 8.11 |
| 30 Oct 2025, 13:18 | 8.12 | 8.12 |
| 22 Sep 2025, 13:01 | 8.19 | 8.19 |
| 11 Aug 2025, 11:29 | 8.19 | 8.19 |
| 2 Jul 2025, 10:55 | 8.13 | 8.13 |
| 11 Jun 2025, 10:19 | 8.03 | 8.03 |
| 21 May 2025, 09:28 | 8.22 | 8.22 |
| 23 Apr 2025, 14:13 | 8.03 | 8.03 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 17 Aug 2026, 45 days ago · 16 results banked
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Aug 2026, 11:59 | <0.03 | below 0.03 mg/l (not detected above this) |
| 28 Jul 2026, 13:27 | 0.041 | 0.041 mg/l |
| 17 Jun 2026, 10:06 | 0.033 | 0.033 mg/l |
| 12 May 2026, 10:10 | 0.078 | 0.078 mg/l |
| 24 Apr 2026, 10:16 | 0.11 | 0.11 mg/l |
| 6 Mar 2026, 09:15 | 0.1 | 0.1 mg/l |
| 4 Feb 2026, 09:54 | 0.22 | 0.22 mg/l |
| 9 Jan 2026, 11:06 | 0.084 | 0.084 mg/l |
| 8 Dec 2025, 12:35 | 0.045 | 0.045 mg/l |
| 24 Nov 2025, 14:21 | 0.14 | 0.14 mg/l |
| 30 Oct 2025, 13:18 | 0.037 | 0.037 mg/l |
| 22 Sep 2025, 13:01 | 0.048 | 0.048 mg/l |
| 11 Aug 2025, 11:29 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Jul 2025, 10:55 | 0.062 | 0.062 mg/l |
| 11 Jun 2025, 10:19 | 0.057 | 0.057 mg/l |
| 21 May 2025, 09:28 | 0.066 | 0.066 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
9.63 mg/l
Sampled 17 Aug 2026, 45 days ago · 16 results banked
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Aug 2026, 11:59 | 9.63 | 9.63 mg/l |
| 28 Jul 2026, 13:27 | 13.9 | 13.9 mg/l |
| 17 Jun 2026, 10:06 | 8.53 | 8.53 mg/l |
| 12 May 2026, 10:10 | 8.81 | 8.81 mg/l |
| 24 Apr 2026, 10:16 | 8.59 | 8.59 mg/l |
| 6 Mar 2026, 09:15 | 7.43 | 7.43 mg/l |
| 4 Feb 2026, 09:54 | 6.05 | 6.05 mg/l |
| 9 Jan 2026, 11:06 | 7.56 | 7.56 mg/l |
| 8 Dec 2025, 12:35 | 7.62 | 7.62 mg/l |
| 24 Nov 2025, 14:21 | 8.49 | 8.49 mg/l |
| 30 Oct 2025, 13:18 | 9.89 | 9.89 mg/l |
| 22 Sep 2025, 13:01 | 12.9 | 12.9 mg/l |
| 11 Aug 2025, 11:29 | 9.86 | 9.86 mg/l |
| 2 Jul 2025, 10:55 | 9.94 | 9.94 mg/l |
| 11 Jun 2025, 10:19 | 9.02 | 9.02 mg/l |
| 21 May 2025, 09:28 | 6.99 | 6.99 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.33 mg/l
Sampled 17 Aug 2026, 45 days ago · 16 results banked
Every result (16)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Aug 2026, 11:59 | 0.33 | 0.33 mg/l |
| 28 Jul 2026, 13:27 | 0.4 | 0.4 mg/l |
| 17 Jun 2026, 10:06 | 0.26 | 0.26 mg/l |
| 12 May 2026, 10:10 | 0.2 | 0.2 mg/l |
| 24 Apr 2026, 10:16 | 0.19 | 0.19 mg/l |
| 6 Mar 2026, 09:15 | 0.13 | 0.13 mg/l |
| 4 Feb 2026, 09:54 | 0.18 | 0.18 mg/l |
| 9 Jan 2026, 11:06 | 0.2 | 0.2 mg/l |
| 8 Dec 2025, 12:35 | 0.22 | 0.22 mg/l |
| 24 Nov 2025, 14:21 | 0.27 | 0.27 mg/l |
| 30 Oct 2025, 13:18 | 0.35 | 0.35 mg/l |
| 22 Sep 2025, 13:01 | 0.44 | 0.44 mg/l |
| 11 Aug 2025, 11:29 | 0.25 | 0.25 mg/l |
| 2 Jul 2025, 10:55 | 0.29 | 0.29 mg/l |
| 11 Jun 2025, 10:19 | 0.22 | 0.22 mg/l |
| 21 May 2025, 09:28 | 0.19 | 0.19 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
693 µS/cm
Sampled 17 Aug 2026, 45 days ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 17 Aug 2026, 11:59 | 693 | 693 µS/cm |
| 28 Jul 2026, 13:27 | 756 | 756 µS/cm |
| 17 Jun 2026, 10:06 | 674 | 674 µS/cm |
| 12 May 2026, 10:10 | 677 | 677 µS/cm |
| 24 Apr 2026, 10:16 | 677 | 677 µS/cm |
| 6 Mar 2026, 09:15 | 680 | 680 µS/cm |
| 4 Feb 2026, 09:54 | 661 | 661 µS/cm |
| 9 Jan 2026, 11:06 | 774 | 774 µS/cm |
| 8 Dec 2025, 12:35 | 718 | 718 µS/cm |
| 24 Nov 2025, 14:21 | 742 | 742 µS/cm |
| 30 Oct 2025, 13:18 | 743 | 743 µS/cm |
| 22 Sep 2025, 13:01 | 792 | 792 µS/cm |
| 11 Aug 2025, 11:29 | 691 | 691 µS/cm |
| 2 Jul 2025, 10:55 | 688 | 688 µS/cm |
| 11 Jun 2025, 10:19 | 690 | 690 µS/cm |
| 21 May 2025, 09:28 | 675 | 675 µS/cm |
| 23 Apr 2025, 14:13 | 604 | 604 µS/cm |
Everything measured here
13 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 13 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 17 | Apr 2025 – Aug 2026 | 92.1% 17 Aug 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 17 | Apr 2025 – Aug 2026 | 8.7 mg/l 17 Aug 2026 |
| Temperature of Water 0076 | River water | 17 | Apr 2025 – Aug 2026 | 18 °C 17 Aug 2026 |
| pH 0061 | River water | 17 | Apr 2025 – Aug 2026 | 8.21 17 Aug 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 16 | May 2025 – Aug 2026 | below 0.03 mg/l 17 Aug 2026 |
| Nitrate as N 0117 | River water | 16 | May 2025 – Aug 2026 | 9.63 mg/l 17 Aug 2026 |
| Orthophosphate, reactive as P 0180 | River water | 16 | May 2025 – Aug 2026 | 0.33 mg/l 17 Aug 2026 |
| Conductivity at 25 C 0077 | River water | 17 | Apr 2025 – Aug 2026 | 693 µS/cm 17 Aug 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 16 | May 2025 – Aug 2026 | 220 mg/l 17 Aug 2026 |
| Ammonia un-ionised as N 0119 | River water | 16 | May 2025 – Aug 2026 | below 0.00098 mg/l 17 Aug 2026 |
| BOD : 5 Day ATU 0085 | River water | 11 | May 2025 – Mar 2026 | 1.4 mg/l 6 Mar 2026 |
| Nitrite as N 0118 | River water | 16 | May 2025 – Aug 2026 | 0.074 mg/l 17 Aug 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 16 | May 2025 – Aug 2026 | 9.7 mg/l 17 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.