Blackwater above Aldershot Military S/W
EA name: BLACKWATER ABOVE ALDERSHOT MILITARY S/W
Environment Agency sampling point TH-PLDR0002 · 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
- 1 Jul 2026, 11:573 months ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 34 since 18 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 488500, 151930As published, to the nearest 10 m. Open in a map
- River, by its own name
- Blackwater
- River, by the map
- Blackwater RiverPlaced on the river its name gives, 5 m from the line.
- Next gauge downstream
- Farnborough On the River Blackwater · 5.0 km along the river
- Nearest gauge upstream
- Tongham On the River Blackwater · 3.1 km along the river
- Why it was sampled
- Environmental monitoring statutory (EU directives) (27 samples)
Monitoring (national agency policy) (7 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
42.7%
Sampled 1 Jul 2026, 3 months ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 Jul 2026, 11:57 | 42.7 | 42.7% |
| 12 Jun 2026, 09:44 | 38.6 | 38.6% |
| 22 May 2026, 08:48 | 38.7 | 38.7% |
| 10 Apr 2026, 08:47 | 57.2 | 57.2% |
| 18 Mar 2026, 09:49 | 60.7 | 60.7% |
| 10 Feb 2026, 10:32 | 70.1 | 70.1% |
| 7 Jan 2026, 11:36 | 61.4 | 61.4% |
| 11 Dec 2025, 10:09 | 70.4 | 70.4% |
| 5 Nov 2025, 09:32 | 48.7 | 48.7% |
| 9 Oct 2025, 11:01 | 53.9 | 53.9% |
| 16 Apr 2025, 14:22 | 66.4 | 66.4% |
| 5 Mar 2025, 10:52 | 65 | 65% |
| 10 Feb 2025, 10:06 | 70.2 | 70.2% |
| 23 Jan 2025, 09:57 | 68.2 | 68.2% |
| 9 Dec 2024, 10:21 | 70.4 | 70.4% |
| 11 Nov 2024, 12:47 | 55.4 | 55.4% |
| 1 Oct 2024, 11:44 | 59.4 | 59.4% |
| 12 Sep 2024, 09:38 | 54.7 | 54.7% |
| 8 Aug 2024, 09:46 | 49.7 | 49.7% |
| 5 Jul 2024, 13:38 | 25.6 | 25.6% |
| 3 Jun 2024, 11:11 | 51.6 | 51.6% |
Dissolved oxygen
as O2 · code 9924 · mg/l
3.92 mg/l
Sampled 1 Jul 2026, 3 months ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 Jul 2026, 11:57 | 3.92 | 3.92 mg/l |
| 12 Jun 2026, 09:44 | 3.77 | 3.77 mg/l |
| 22 May 2026, 08:48 | 3.76 | 3.76 mg/l |
| 10 Apr 2026, 08:47 | 6.22 | 6.22 mg/l |
| 18 Mar 2026, 09:49 | 6.65 | 6.65 mg/l |
| 10 Feb 2026, 10:32 | 7.88 | 7.88 mg/l |
| 7 Jan 2026, 11:36 | 7.41 | 7.41 mg/l |
| 11 Dec 2025, 10:09 | 7.86 | 7.86 mg/l |
| 5 Nov 2025, 09:32 | 4.93 | 4.93 mg/l |
| 9 Oct 2025, 11:01 | 5.44 | 5.44 mg/l |
| 16 Apr 2025, 14:22 | 6.8 | 6.8 mg/l |
| 5 Mar 2025, 10:52 | 7.65 | 7.65 mg/l |
| 10 Feb 2025, 10:06 | 8.51 | 8.51 mg/l |
| 23 Jan 2025, 09:57 | 8.04 | 8.04 mg/l |
| 9 Dec 2024, 10:21 | 8.12 | 8.12 mg/l |
| 11 Nov 2024, 12:47 | 5.76 | 5.76 mg/l |
| 1 Oct 2024, 11:44 | 6.09 | 6.09 mg/l |
| 12 Sep 2024, 09:38 | 5.64 | 5.64 mg/l |
| 8 Aug 2024, 09:46 | 4.71 | 4.71 mg/l |
| 5 Jul 2024, 13:38 | 2.39 | 2.39 mg/l |
| 3 Jun 2024, 11:11 | 5.06 | 5.06 mg/l |
Water temperature
code 0076 · °C
19.4 °C
Sampled 1 Jul 2026, 3 months ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 Jul 2026, 11:57 | 19.4 | 19.4 °C |
| 12 Jun 2026, 09:44 | 16.4 | 16.4 °C |
| 22 May 2026, 08:48 | 16.6 | 16.6 °C |
| 10 Apr 2026, 08:47 | 11.5 | 11.5 °C |
| 18 Mar 2026, 09:49 | 11.2 | 11.2 °C |
| 10 Feb 2026, 10:32 | 10.1 | 10.1 °C |
| 7 Jan 2026, 11:36 | 7.2 | 7.2 °C |
| 11 Dec 2025, 10:09 | 10.4 | 10.4 °C |
| 5 Nov 2025, 09:32 | 14.7 | 14.7 °C |
| 9 Oct 2025, 11:01 | 14.8 | 14.8 °C |
| 16 Apr 2025, 14:22 | 14.2 | 14.2 °C |
| 5 Mar 2025, 10:52 | 8.2 | 8.2 °C |
| 10 Feb 2025, 10:06 | 7 | 7 °C |
| 23 Jan 2025, 09:57 | 8.1 | 8.1 °C |
| 9 Dec 2024, 10:21 | 9 | 9 °C |
| 11 Nov 2024, 12:47 | 13.5 | 13.5 °C |
| 1 Oct 2024, 11:44 | 14.1 | 14.1 °C |
| 12 Sep 2024, 09:38 | 13.9 | 13.9 °C |
| 8 Aug 2024, 09:46 | 17.8 | 17.8 °C |
| 5 Jul 2024, 13:38 | 18.6 | 18.6 °C |
| 3 Jun 2024, 11:11 | 16.2 | 16.2 °C |
pH
code 0061
7.25
Sampled 1 Jul 2026, 3 months ago · 34 results banked
Every result (34)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 Jul 2026, 11:57 | 7.25 | 7.25 |
| 12 Jun 2026, 09:44 | 7.04 | 7.04 |
| 22 May 2026, 08:48 | 7.02 | 7.02 |
| 10 Apr 2026, 08:47 | 7.2 | 7.2 |
| 18 Mar 2026, 09:49 | 7.32 | 7.32 |
| 10 Feb 2026, 10:32 | 7.31 | 7.31 |
| 7 Jan 2026, 11:36 | 7.16 | 7.16 |
| 11 Dec 2025, 10:09 | 7.4 | 7.4 |
| 5 Nov 2025, 09:32 | 7.22 | 7.22 |
| 9 Oct 2025, 11:01 | 7.12 | 7.12 |
| 11 Sep 2025, 09:21 | 7.29 | 7.29 |
| 14 Aug 2025, 09:29 | 7.31 | 7.31 |
| 24 Jul 2025, 09:24 | 7.37 | 7.37 |
| 26 Jun 2025, 10:19 | 7.33 | 7.33 |
| 22 May 2025, 11:55 | 7.09 | 7.09 |
| 16 Apr 2025, 14:22 | 7.33 | 7.33 |
| 5 Mar 2025, 10:52 | 7.46 | 7.46 |
| 10 Feb 2025, 10:06 | 7.37 | 7.37 |
| 23 Jan 2025, 09:57 | 7.22 | 7.22 |
| 9 Dec 2024, 10:21 | 7.5 | 7.5 |
| 11 Nov 2024, 12:47 | 7.37 | 7.37 |
| 1 Oct 2024, 11:44 | 6.85 | 6.85 |
| 12 Sep 2024, 09:38 | 7.3 | 7.3 |
| 8 Aug 2024, 09:46 | 7.27 | 7.27 |
| 5 Jul 2024, 13:38 | 7.14 | 7.14 |
| 3 Jun 2024, 11:11 | 7.25 | 7.25 |
| 3 May 2024, 12:36 | 7.5 | 7.5 |
| 16 Apr 2024, 10:00 | 7.55 | 7.55 |
| 11 Mar 2024, 11:17 | 7.42 | 7.42 |
| 5 Feb 2024, 11:08 | 7.35 | 7.35 |
| 22 Jan 2024, 12:47 | 7.2 | 7.2 |
| 6 Dec 2023, 10:43 | 7.33 | 7.33 |
| 8 Nov 2023, 11:56 | 7.17 | 7.17 |
| 18 Oct 2023, 11:31 | 7.32 | 7.32 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.14 mg/l
Sampled 1 Jul 2026, 3 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 Jul 2026, 11:57 | 0.14 | 0.14 mg/l |
| 12 Jun 2026, 09:44 | 0.17 | 0.17 mg/l |
| 22 May 2026, 08:48 | 0.2 | 0.2 mg/l |
| 10 Apr 2026, 08:47 | 0.28 | 0.28 mg/l |
| 18 Mar 2026, 09:49 | 0.3 | 0.3 mg/l |
| 10 Feb 2026, 10:32 | 0.15 | 0.15 mg/l |
| 7 Jan 2026, 11:36 | 2.2 | 2.2 mg/l |
| 11 Dec 2025, 10:09 | 0.23 | 0.23 mg/l |
| 5 Nov 2025, 09:32 | 0.23 | 0.23 mg/l |
| 9 Oct 2025, 11:01 | 0.17 | 0.17 mg/l |
| 16 Apr 2025, 14:22 | 0.23 | 0.23 mg/l |
| 5 Mar 2025, 10:52 | 0.2 | 0.2 mg/l |
| 10 Feb 2025, 10:06 | 0.44 | 0.44 mg/l |
| 23 Jan 2025, 09:57 | 1.1 | 1.1 mg/l |
| 11 Nov 2024, 12:47 | 0.2 | 0.2 mg/l |
| 1 Oct 2024, 11:44 | 0.24 | 0.24 mg/l |
| 12 Sep 2024, 09:38 | 0.15 | 0.15 mg/l |
| 8 Aug 2024, 09:46 | 0.2 | 0.2 mg/l |
| 5 Jul 2024, 13:38 | 0.22 | 0.22 mg/l |
| 3 Jun 2024, 11:11 | 0.22 | 0.22 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
13.9 mg/l
Sampled 1 Jul 2026, 3 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 Jul 2026, 11:57 | 13.9 | 13.9 mg/l |
| 12 Jun 2026, 09:44 | 11.9 | 11.9 mg/l |
| 22 May 2026, 08:48 | 13.9 | 13.9 mg/l |
| 10 Apr 2026, 08:47 | 14.9 | 14.9 mg/l |
| 18 Mar 2026, 09:49 | 9.22 | 9.22 mg/l |
| 10 Feb 2026, 10:32 | 5.57 | 5.57 mg/l |
| 7 Jan 2026, 11:36 | 6.44 | 6.44 mg/l |
| 11 Dec 2025, 10:09 | 8.24 | 8.24 mg/l |
| 5 Nov 2025, 09:32 | 9.92 | 9.92 mg/l |
| 9 Oct 2025, 11:01 | 14.9 | 14.9 mg/l |
| 16 Apr 2025, 14:22 | 10.9 | 10.9 mg/l |
| 5 Mar 2025, 10:52 | 6.84 | 6.84 mg/l |
| 10 Feb 2025, 10:06 | 4.71 | 4.71 mg/l |
| 23 Jan 2025, 09:57 | 8.85 | 8.85 mg/l |
| 11 Nov 2024, 12:47 | 13.9 | 13.9 mg/l |
| 1 Oct 2024, 11:44 | 3.66 | 3.66 mg/l |
| 12 Sep 2024, 09:38 | 8.95 | 8.95 mg/l |
| 8 Aug 2024, 09:46 | 11.9 | 11.9 mg/l |
| 5 Jul 2024, 13:38 | 13.9 | 13.9 mg/l |
| 3 Jun 2024, 11:11 | 10.8 | 10.8 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.54 mg/l
Sampled 1 Jul 2026, 3 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 Jul 2026, 11:57 | 0.54 | 0.54 mg/l |
| 12 Jun 2026, 09:44 | 0.6 | 0.6 mg/l |
| 22 May 2026, 08:48 | 0.74 | 0.74 mg/l |
| 10 Apr 2026, 08:47 | 0.6 | 0.6 mg/l |
| 18 Mar 2026, 09:49 | 0.52 | 0.52 mg/l |
| 10 Feb 2026, 10:32 | 0.22 | 0.22 mg/l |
| 7 Jan 2026, 11:36 | 0.41 | 0.41 mg/l |
| 11 Dec 2025, 10:09 | 0.13 | 0.13 mg/l |
| 5 Nov 2025, 09:32 | 0.16 | 0.16 mg/l |
| 9 Oct 2025, 11:01 | 0.2 | 0.2 mg/l |
| 16 Apr 2025, 14:22 | 0.99 | 0.99 mg/l |
| 5 Mar 2025, 10:52 | 0.39 | 0.39 mg/l |
| 10 Feb 2025, 10:06 | 0.24 | 0.24 mg/l |
| 23 Jan 2025, 09:57 | 0.24 | 0.24 mg/l |
| 11 Nov 2024, 12:47 | 0.45 | 0.45 mg/l |
| 1 Oct 2024, 11:44 | 0.22 | 0.22 mg/l |
| 12 Sep 2024, 09:38 | 0.28 | 0.28 mg/l |
| 8 Aug 2024, 09:46 | 0.5 | 0.5 mg/l |
| 5 Jul 2024, 13:38 | 0.47 | 0.47 mg/l |
| 3 Jun 2024, 11:11 | 0.34 | 0.34 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
781 µS/cm
Sampled 1 Jul 2026, 3 months ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 1 Jul 2026, 11:57 | 781 | 781 µS/cm |
| 12 Jun 2026, 09:44 | 643 | 643 µS/cm |
| 22 May 2026, 08:48 | 846 | 846 µS/cm |
| 10 Apr 2026, 08:47 | 810 | 810 µS/cm |
| 18 Mar 2026, 09:49 | 718 | 718 µS/cm |
| 10 Feb 2026, 10:32 | 600 | 600 µS/cm |
| 7 Jan 2026, 11:36 | 903 | 903 µS/cm |
| 11 Dec 2025, 10:09 | 666 | 666 µS/cm |
| 5 Nov 2025, 09:32 | 718 | 718 µS/cm |
| 9 Oct 2025, 11:01 | 823 | 823 µS/cm |
| 16 Apr 2025, 14:22 | 824 | 824 µS/cm |
| 5 Mar 2025, 10:52 | 726 | 726 µS/cm |
| 10 Feb 2025, 10:06 | 650 | 650 µS/cm |
| 23 Jan 2025, 09:57 | 776 | 776 µS/cm |
| 9 Dec 2024, 10:21 | 566 | 566 µS/cm |
| 11 Nov 2024, 12:47 | 824 | 824 µS/cm |
| 1 Oct 2024, 11:44 | 573 | 573 µS/cm |
| 12 Sep 2024, 09:38 | 665 | 665 µS/cm |
| 8 Aug 2024, 09:46 | 735 | 735 µS/cm |
| 5 Jul 2024, 13:38 | 712 | 712 µS/cm |
| 3 Jun 2024, 11:11 | 768 | 768 µS/cm |
Everything measured here
29 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 29 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 21 | Jun 2024 – Jul 2026 | 42.7% 1 Jul 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 21 | Jun 2024 – Jul 2026 | 3.92 mg/l 1 Jul 2026 |
| Temperature of Water 0076 | River water | 21 | Jun 2024 – Jul 2026 | 19.4 °C 1 Jul 2026 |
| pH 0061 | River water | 34 | Oct 2023 – Jul 2026 | 7.25 1 Jul 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 20 | Jun 2024 – Jul 2026 | 0.14 mg/l 1 Jul 2026 |
| Nitrate as N 0117 | River water | 20 | Jun 2024 – Jul 2026 | 13.9 mg/l 1 Jul 2026 |
| Orthophosphate, reactive as P 0180 | River water | 20 | Jun 2024 – Jul 2026 | 0.54 mg/l 1 Jul 2026 |
| Conductivity at 25 C 0077 | River water | 21 | Jun 2024 – Jul 2026 | 781 µS/cm 1 Jul 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 20 | Jun 2024 – Jul 2026 | 120 mg/l 1 Jul 2026 |
| Ammonia un-ionised as N 0119 | River water | 20 | Jun 2024 – Jul 2026 | 0.00093 mg/l 1 Jul 2026 |
| BOD : 5 Day ATU 0085 | River water | 20 | Jun 2024 – Jul 2026 | 1.1 mg/l 1 Jul 2026 |
| Cadmium, Dissolved 0106 | River water | 34 | Oct 2023 – Jul 2026 | below 0.01 µg/l 1 Jul 2026 |
| Calcium 0241 | River water | 12 | Oct 2023 – Jul 2026 | 78 mg/l 1 Jul 2026 |
| Calcium, Dissolved 0239 | River water | 34 | Oct 2023 – Jul 2026 | 77 mg/l 1 Jul 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 33 | Oct 2023 – Jul 2026 | 6.4 mg/l 1 Jul 2026 |
| Chromium Hexavalent, Dissolved :- {Cr VI} 6619 | River water | 11 | Oct 2023 – Jul 2026 | 0.19 µg/l 1 Jul 2026 |
| Chromium, Dissolved 3409 | River water | 12 | Oct 2023 – Jul 2026 | below 0.5 µg/l 1 Jul 2026 |
| Copper : BLM Bioavailable 4821 | River water | 12 | Oct 2023 – Jul 2026 | 0.08 µg/l 1 Jul 2026 |
| Copper, Dissolved 6450 | River water | 12 | Oct 2023 – Jul 2026 | 2.4 µg/l 1 Jul 2026 |
| Hardness, Total as CaCO3 0158 | River water | 12 | Oct 2023 – Jul 2026 | 221 mg/l 1 Jul 2026 |
| Iron, Dissolved 6460 | River water | 12 | Oct 2023 – Jul 2026 | 130 µg/l 1 Jul 2026 |
| Magnesium 0237 | River water | 12 | Oct 2023 – Jul 2026 | 7.2 mg/l 1 Jul 2026 |
| Magnesium, Dissolved 0235 | River water | 34 | Oct 2023 – Jul 2026 | 7.1 mg/l 1 Jul 2026 |
| Nickel : BLM Bioavailable 3878 | River water | 33 | Oct 2023 – Jul 2026 | 0.71 µg/l 1 Jul 2026 |
| Nickel, Dissolved 3410 | River water | 34 | Oct 2023 – Jul 2026 | 3.7 µg/l 1 Jul 2026 |
| Nitrite as N 0118 | River water | 20 | Jun 2024 – Jul 2026 | 0.098 mg/l 1 Jul 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 20 | Jun 2024 – Jul 2026 | 14 mg/l 1 Jul 2026 |
| Zinc 6455 | River water | 12 | Oct 2023 – Jul 2026 | 21 µg/l 1 Jul 2026 |
| Zinc, Dissolved 3408 | River water | 12 | Oct 2023 – Jul 2026 | 13 µg/l 1 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.