River Blackwater Appleford
EA name: R.BLACKWATER APPLEFORD
Environment Agency sampling point AN-BL03 · 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
- 5 May 2026, 09:535 months ago · time as the Environment Agency records it (UK clock time; the source gives no time zone). Not sampled since, as far as the archive shows: the Environment Agency was asked up to 30 Sep 2026 and had nothing newer.
- Samples banked
- 24 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 Monitoring (national agency policy)
- Where
- National Grid 584473, 215824As published, to the nearest 1 m. Open in a map
- River, by its own name
- Blackwater
- River, by the map
- River BlackwaterPlaced on the river its name gives, 16 m from the line.
- Next gauge downstream
- None tracedIts water reaches the sea without passing a gauge.Beside Appleford Bridge: too close to say above or below.
- Nearest gauge upstream
- Stisted On the River Blackwater · 19 km along the river
- Why it was sampled
- Monitoring (national agency policy) (24 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
91%
Sampled 5 May 2026, 5 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 May 2026, 09:53 | 91 | 91% |
| 8 Apr 2026, 09:07 | 95.6 | 95.6% |
| 5 Mar 2026, 09:54 | 95 | 95% |
| 11 Feb 2026, 10:08 | 94.6 | 94.6% |
| 2 Jan 2026, 14:49 | 96.2 | 96.2% |
| 9 Dec 2025, 09:47 | 88.3 | 88.3% |
| 3 Mar 2025, 07:50 | 95.3 | 95.3% |
| 4 Feb 2025, 08:32 | 94.9 | 94.9% |
| 21 Jan 2025, 13:04 | 96.6 | 96.6% |
| 10 Dec 2024, 13:18 | 92.7 | 92.7% |
| 21 Nov 2024, 09:45 | 92 | 92% |
| 16 Oct 2024, 09:49 | 86 | 86% |
| 24 Sep 2024, 10:52 | 77.5 | 77.5% |
| 23 Aug 2024, 09:52 | 90.4 | 90.4% |
| 16 Jul 2024, 15:45 | 97.6 | 97.6% |
| 20 Jun 2024, 13:34 | 95.3 | 95.3% |
| 16 May 2024, 14:40 | 96.4 | 96.4% |
| 18 Apr 2024, 14:54 | 132 | 132% |
| 20 Mar 2024, 13:52 | 101 | 101% |
| 17 Jan 2024, 09:09 | 91.7 | 91.7% |
| 5 Dec 2023, 09:53 | 89.9 | 89.9% |
| 20 Nov 2023, 09:07 | 91.8 | 91.8% |
| 23 Oct 2023, 09:29 | 87.2 | 87.2% |
| 17 Oct 2023, 09:50 | 88.3 | 88.3% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.33 mg/l
Sampled 5 May 2026, 5 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 May 2026, 09:53 | 9.33 | 9.33 mg/l |
| 8 Apr 2026, 09:07 | 10.7 | 10.7 mg/l |
| 5 Mar 2026, 09:54 | 11.3 | 11.3 mg/l |
| 11 Feb 2026, 10:08 | 11 | 11 mg/l |
| 2 Jan 2026, 14:49 | 12.9 | 12.9 mg/l |
| 9 Dec 2025, 09:47 | 10.1 | 10.1 mg/l |
| 3 Mar 2025, 07:50 | 12.2 | 12.2 mg/l |
| 4 Feb 2025, 08:32 | 12.1 | 12.1 mg/l |
| 21 Jan 2025, 13:04 | 12.2 | 12.2 mg/l |
| 10 Dec 2024, 13:18 | 11.2 | 11.2 mg/l |
| 21 Nov 2024, 09:45 | 11.7 | 11.7 mg/l |
| 16 Oct 2024, 09:49 | 9.18 | 9.18 mg/l |
| 24 Sep 2024, 10:52 | 7.66 | 7.66 mg/l |
| 23 Aug 2024, 09:52 | 8.66 | 8.66 mg/l |
| 16 Jul 2024, 15:45 | 9.29 | 9.29 mg/l |
| 20 Jun 2024, 13:34 | 9.22 | 9.22 mg/l |
| 16 May 2024, 14:40 | 9.57 | 9.57 mg/l |
| 18 Apr 2024, 14:54 | 14.3 | 14.3 mg/l |
| 20 Mar 2024, 13:52 | 10.8 | 10.8 mg/l |
| 17 Jan 2024, 09:09 | 12.4 | 12.4 mg/l |
| 5 Dec 2023, 09:53 | 11.2 | 11.2 mg/l |
| 20 Nov 2023, 09:07 | 10.5 | 10.5 mg/l |
| 23 Oct 2023, 09:29 | 9.69 | 9.69 mg/l |
| 17 Oct 2023, 09:50 | 9.72 | 9.72 mg/l |
Water temperature
code 0076 · °C
14.1 °C
Sampled 5 May 2026, 5 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 May 2026, 09:53 | 14.1 | 14.1 °C |
| 8 Apr 2026, 09:07 | 10.1 | 10.1 °C |
| 5 Mar 2026, 09:54 | 7.7 | 7.7 °C |
| 11 Feb 2026, 10:08 | 8.7 | 8.7 °C |
| 2 Jan 2026, 14:49 | 3.1 | 3.1 °C |
| 9 Dec 2025, 09:47 | 9.5 | 9.5 °C |
| 3 Mar 2025, 07:50 | 4.9 | 4.9 °C |
| 4 Feb 2025, 08:32 | 4.9 | 4.9 °C |
| 21 Jan 2025, 13:04 | 5.4 | 5.4 °C |
| 10 Dec 2024, 13:18 | 7.2 | 7.2 °C |
| 21 Nov 2024, 09:45 | 5.1 | 5.1 °C |
| 16 Oct 2024, 09:49 | 12.3 | 12.3 °C |
| 24 Sep 2024, 10:52 | 15.8 | 15.8 °C |
| 23 Aug 2024, 09:52 | 17.3 | 17.3 °C |
| 16 Jul 2024, 15:45 | 17.6 | 17.6 °C |
| 20 Jun 2024, 13:34 | 16.8 | 16.8 °C |
| 16 May 2024, 14:40 | 15.6 | 15.6 °C |
| 18 Apr 2024, 14:54 | 11.8 | 11.8 °C |
| 20 Mar 2024, 13:52 | 12.4 | 12.4 °C |
| 17 Jan 2024, 09:09 | 2.9 | 2.9 °C |
| 5 Dec 2023, 09:53 | 5.9 | 5.9 °C |
| 20 Nov 2023, 09:07 | 9.4 | 9.4 °C |
| 23 Oct 2023, 09:29 | 10.6 | 10.6 °C |
| 17 Oct 2023, 09:50 | 11 | 11 °C |
pH
code 0061
7.99
Sampled 5 May 2026, 5 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 May 2026, 09:53 | 7.99 | 7.99 |
| 8 Apr 2026, 09:07 | 8.23 | 8.23 |
| 5 Mar 2026, 09:54 | 7.96 | 7.96 |
| 11 Feb 2026, 10:08 | 8.02 | 8.02 |
| 2 Jan 2026, 14:49 | 8.24 | 8.24 |
| 9 Dec 2025, 09:47 | 7.91 | 7.91 |
| 3 Mar 2025, 07:50 | 8.05 | 8.05 |
| 4 Feb 2025, 08:32 | 8.17 | 8.17 |
| 21 Jan 2025, 13:04 | 8.12 | 8.12 |
| 10 Dec 2024, 13:18 | 8.02 | 8.02 |
| 21 Nov 2024, 09:45 | 7.98 | 7.98 |
| 16 Oct 2024, 09:49 | 8.05 | 8.05 |
| 24 Sep 2024, 10:52 | 7.82 | 7.82 |
| 23 Aug 2024, 09:52 | 8.27 | 8.27 |
| 16 Jul 2024, 15:45 | 8.28 | 8.28 |
| 20 Jun 2024, 13:34 | 8.13 | 8.13 |
| 16 May 2024, 14:40 | 8.11 | 8.11 |
| 18 Apr 2024, 14:54 | 8.59 | 8.59 |
| 20 Mar 2024, 13:52 | 8.15 | 8.15 |
| 17 Jan 2024, 09:09 | 8.09 | 8.09 |
| 5 Dec 2023, 09:53 | 7.93 | 7.93 |
| 20 Nov 2023, 09:07 | 7.97 | 7.97 |
| 23 Oct 2023, 09:29 | 7.86 | 7.86 |
| 17 Oct 2023, 09:50 | 7.93 | 7.93 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.13 mg/l
Sampled 5 May 2026, 5 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 May 2026, 09:53 | 0.13 | 0.13 mg/l |
| 8 Apr 2026, 09:07 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Mar 2026, 09:54 | 0.041 | 0.041 mg/l |
| 11 Feb 2026, 10:08 | 0.05 | 0.05 mg/l |
| 2 Jan 2026, 14:49 | 0.14 | 0.14 mg/l |
| 9 Dec 2025, 09:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Mar 2025, 07:50 | 0.063 | 0.063 mg/l |
| 4 Feb 2025, 08:32 | 0.18 | 0.18 mg/l |
| 21 Jan 2025, 13:04 | 0.12 | 0.12 mg/l |
| 10 Dec 2024, 13:18 | 0.032 | 0.032 mg/l |
| 21 Nov 2024, 09:45 | 0.035 | 0.035 mg/l |
| 16 Oct 2024, 09:49 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Sep 2024, 10:52 | 0.4 | 0.4 mg/l |
| 23 Aug 2024, 09:52 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Jul 2024, 15:45 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Jun 2024, 13:34 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 May 2024, 14:40 | 0.047 | 0.047 mg/l |
| 18 Apr 2024, 14:54 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Mar 2024, 13:52 | 0.031 | 0.031 mg/l |
| 17 Jan 2024, 09:09 | 0.14 | 0.14 mg/l |
| 5 Dec 2023, 09:53 | 0.14 | 0.14 mg/l |
| 20 Nov 2023, 09:07 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Oct 2023, 09:29 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Oct 2023, 09:50 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
8.94 mg/l
Sampled 5 May 2026, 5 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 May 2026, 09:53 | 8.94 | 8.94 mg/l |
| 8 Apr 2026, 09:07 | 9.56 | 9.56 mg/l |
| 5 Mar 2026, 09:54 | 10.9 | 10.9 mg/l |
| 11 Feb 2026, 10:08 | 12 | 12 mg/l |
| 2 Jan 2026, 14:49 | 12.9 | 12.9 mg/l |
| 9 Dec 2025, 09:47 | 15.9 | 15.9 mg/l |
| 3 Mar 2025, 07:50 | 10.9 | 10.9 mg/l |
| 4 Feb 2025, 08:32 | 11.9 | 11.9 mg/l |
| 21 Jan 2025, 13:04 | 10.9 | 10.9 mg/l |
| 10 Dec 2024, 13:18 | 15 | 15 mg/l |
| 21 Nov 2024, 09:45 | 9.56 | 9.56 mg/l |
| 16 Oct 2024, 09:49 | 11 | 11 mg/l |
| 24 Sep 2024, 10:52 | 10.9 | 10.9 mg/l |
| 23 Aug 2024, 09:52 | 11 | 11 mg/l |
| 16 Jul 2024, 15:45 | 8.85 | 8.85 mg/l |
| 20 Jun 2024, 13:34 | 11 | 11 mg/l |
| 16 May 2024, 14:40 | 9.54 | 9.54 mg/l |
| 18 Apr 2024, 14:54 | 9.96 | 9.96 mg/l |
| 20 Mar 2024, 13:52 | 9.07 | 9.07 mg/l |
| 17 Jan 2024, 09:09 | 10.9 | 10.9 mg/l |
| 5 Dec 2023, 09:53 | 10.9 | 10.9 mg/l |
| 20 Nov 2023, 09:07 | 12 | 12 mg/l |
| 23 Oct 2023, 09:29 | 15 | 15 mg/l |
| 17 Oct 2023, 09:50 | 8.58 | 8.58 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.17 mg/l
Sampled 5 May 2026, 5 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 May 2026, 09:53 | 0.17 | 0.17 mg/l |
| 8 Apr 2026, 09:07 | 0.11 | 0.11 mg/l |
| 5 Mar 2026, 09:54 | 0.13 | 0.13 mg/l |
| 11 Feb 2026, 10:08 | 0.11 | 0.11 mg/l |
| 2 Jan 2026, 14:49 | 0.18 | 0.18 mg/l |
| 9 Dec 2025, 09:47 | 0.17 | 0.17 mg/l |
| 3 Mar 2025, 07:50 | 0.12 | 0.12 mg/l |
| 4 Feb 2025, 08:32 | 0.15 | 0.15 mg/l |
| 21 Jan 2025, 13:04 | 0.18 | 0.18 mg/l |
| 10 Dec 2024, 13:18 | 0.19 | 0.19 mg/l |
| 21 Nov 2024, 09:45 | 0.22 | 0.22 mg/l |
| 16 Oct 2024, 09:49 | 0.2 | 0.2 mg/l |
| 24 Sep 2024, 10:52 | 0.3 | 0.3 mg/l |
| 23 Aug 2024, 09:52 | 0.3 | 0.3 mg/l |
| 16 Jul 2024, 15:45 | 0.26 | 0.26 mg/l |
| 20 Jun 2024, 13:34 | 0.23 | 0.23 mg/l |
| 16 May 2024, 14:40 | 0.26 | 0.26 mg/l |
| 18 Apr 2024, 14:54 | 0.17 | 0.17 mg/l |
| 20 Mar 2024, 13:52 | 0.14 | 0.14 mg/l |
| 17 Jan 2024, 09:09 | 0.16 | 0.16 mg/l |
| 5 Dec 2023, 09:53 | 0.16 | 0.16 mg/l |
| 20 Nov 2023, 09:07 | 0.12 | 0.12 mg/l |
| 23 Oct 2023, 09:29 | 0.18 | 0.18 mg/l |
| 17 Oct 2023, 09:50 | 0.22 | 0.22 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
864 µS/cm
Sampled 5 May 2026, 5 months ago · 24 results banked
Every result (24)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 May 2026, 09:53 | 864 | 864 µS/cm |
| 8 Apr 2026, 09:07 | 855 | 855 µS/cm |
| 5 Mar 2026, 09:54 | 817 | 817 µS/cm |
| 11 Feb 2026, 10:08 | 719 | 719 µS/cm |
| 2 Jan 2026, 14:49 | 922 | 922 µS/cm |
| 9 Dec 2025, 09:47 | 867 | 867 µS/cm |
| 3 Mar 2025, 07:50 | 829 | 829 µS/cm |
| 4 Feb 2025, 08:32 | 802 | 802 µS/cm |
| 21 Jan 2025, 13:04 | 923 | 923 µS/cm |
| 10 Dec 2024, 13:18 | 651 | 651 µS/cm |
| 21 Nov 2024, 09:45 | 871 | 871 µS/cm |
| 16 Oct 2024, 09:49 | 852 | 852 µS/cm |
| 24 Sep 2024, 10:52 | 877 | 877 µS/cm |
| 23 Aug 2024, 09:52 | 1234 | 1234 µS/cm |
| 16 Jul 2024, 15:45 | 777 | 777 µS/cm |
| 20 Jun 2024, 13:34 | 892 | 892 µS/cm |
| 16 May 2024, 14:40 | 837 | 837 µS/cm |
| 18 Apr 2024, 14:54 | 915 | 915 µS/cm |
| 20 Mar 2024, 13:52 | 813 | 813 µS/cm |
| 17 Jan 2024, 09:09 | 872 | 872 µS/cm |
| 5 Dec 2023, 09:53 | 864 | 864 µS/cm |
| 20 Nov 2023, 09:07 | 700 | 700 µS/cm |
| 23 Oct 2023, 09:29 | 650 | 650 µS/cm |
| 17 Oct 2023, 09:50 | 801 | 801 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 | 24 | Oct 2023 – May 2026 | 91% 5 May 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 24 | Oct 2023 – May 2026 | 9.33 mg/l 5 May 2026 |
| Temperature of Water 0076 | River water | 24 | Oct 2023 – May 2026 | 14.1 °C 5 May 2026 |
| pH 0061 | River water | 24 | Oct 2023 – May 2026 | 7.99 5 May 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 24 | Oct 2023 – May 2026 | 0.13 mg/l 5 May 2026 |
| Nitrate as N 0117 | River water | 24 | Oct 2023 – May 2026 | 8.94 mg/l 5 May 2026 |
| Orthophosphate, reactive as P 0180 | River water | 24 | Oct 2023 – May 2026 | 0.17 mg/l 5 May 2026 |
| Conductivity at 25 C 0077 | River water | 24 | Oct 2023 – May 2026 | 864 µS/cm 5 May 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 24 | Oct 2023 – May 2026 | 230 mg/l 5 May 2026 |
| Ammonia un-ionised as N 0119 | River water | 24 | Oct 2023 – May 2026 | 0.00313 mg/l 5 May 2026 |
| BOD : 5 Day ATU 0085 | River water | 19 | Mar 2024 – May 2026 | 1.3 mg/l 5 May 2026 |
| Nitrite as N 0118 | River water | 24 | Oct 2023 – May 2026 | 0.061 mg/l 5 May 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 24 | Oct 2023 – May 2026 | 9 mg/l 5 May 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.