Headwaters Barnwell Brook upstream of Barnwell sewage treatment works
EA name: HDWTRS BARNWELL BK U/S BARNWELL STW (also listed as “HEADWATERS BARNWELL BROOK U/S BARNWELL STW”)
Environment Agency sampling point AN-BARNWLUS · 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
- 25 Mar 2026, 14:026 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 9 Apr 2024 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Planned investigation (national agency policy)
- Where
- National Grid 504824, 285179As published, to the nearest 1 m. Open in a map
- River, by its own name
- Hdwtrs Barnwell Brook
- River, by the map
- Barnwell BrookPlaced on a river whose name partly matches its own, 1 m from the line.
- Next gauge downstream
- WANSFORD A47 NO1 WITS 24 km along the river
- Why it was sampled
- Planned investigation (national agency policy) (24 samples)
9 visits found no water to sample (recorded as “No flow”).
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
118.5%
Sampled 25 Mar 2026, 6 months ago · 13 results banked
Every result (13)
| Sampled | Result as published | Reads as |
|---|---|---|
| 25 Mar 2026, 14:02 | 118.5 | 118.5% |
| 12 Feb 2026, 10:20 | 95.9 | 95.9% |
| 6 Jan 2026, 13:40 | 104.3 | 104.3% |
| 1 Dec 2025, 14:48 | 92.5 | 92.5% |
| 2 Jun 2025, 13:45 | 49.4 | 49.4% |
| 2 Apr 2025, 12:27 | 135.9 | 135.9% |
| 10 Mar 2025, 10:46 | 103.6 | 103.6% |
| 10 Feb 2025, 10:11 | 98.6 | 98.6% |
| 24 Jan 2025, 10:56 | 99.5 | 99.5% |
| 4 Dec 2024, 14:08 | 100.1 | 100.1% |
| 5 Nov 2024, 11:02 | 89.9 | 89.9% |
| 9 Oct 2024, 09:11 | 91.2 | 91.2% |
| 3 Jun 2024, 08:43 | 83.4 | 83.4% |
Dissolved oxygen
as O2 · code 9924 · mg/l
13.6 mg/l
Sampled 25 Mar 2026, 6 months ago · 13 results banked
Every result (13)
| Sampled | Result as published | Reads as |
|---|---|---|
| 25 Mar 2026, 14:02 | 13.6 | 13.6 mg/l |
| 12 Feb 2026, 10:20 | 11.6 | 11.6 mg/l |
| 6 Jan 2026, 13:40 | 14.7 | 14.7 mg/l |
| 1 Dec 2025, 14:48 | 10.6 | 10.6 mg/l |
| 2 Jun 2025, 13:45 | 4.93 | 4.93 mg/l |
| 2 Apr 2025, 12:27 | 14.9 | 14.9 mg/l |
| 10 Mar 2025, 10:46 | 12.5 | 12.5 mg/l |
| 10 Feb 2025, 10:11 | 12.6 | 12.6 mg/l |
| 24 Jan 2025, 10:56 | 12.2 | 12.2 mg/l |
| 4 Dec 2024, 14:08 | 12.1 | 12.1 mg/l |
| 5 Nov 2024, 11:02 | 9.92 | 9.92 mg/l |
| 9 Oct 2024, 09:11 | 9.56 | 9.56 mg/l |
| 3 Jun 2024, 08:43 | 8.77 | 8.77 mg/l |
Water temperature
code 0076 · °C
9.1 °C
Sampled 25 Mar 2026, 6 months ago · 13 results banked
Every result (13)
| Sampled | Result as published | Reads as |
|---|---|---|
| 25 Mar 2026, 14:02 | 9.1 | 9.1 °C |
| 12 Feb 2026, 10:20 | 7.2 | 7.2 °C |
| 6 Jan 2026, 13:40 | 1.2 | 1.2 °C |
| 1 Dec 2025, 14:48 | 9.1 | 9.1 °C |
| 2 Jun 2025, 13:45 | 15.4 | 15.4 °C |
| 2 Apr 2025, 12:27 | 11.2 | 11.2 °C |
| 10 Mar 2025, 10:46 | 7.2 | 7.2 °C |
| 10 Feb 2025, 10:11 | 4.9 | 4.9 °C |
| 24 Jan 2025, 10:56 | 6.6 | 6.6 °C |
| 4 Dec 2024, 14:08 | 7.2 | 7.2 °C |
| 5 Nov 2024, 11:02 | 10.9 | 10.9 °C |
| 9 Oct 2024, 09:11 | 13.1 | 13.1 °C |
| 3 Jun 2024, 08:43 | 13 | 13 °C |
pH
code 0061
8.11
Sampled 25 Mar 2026, 6 months ago · 13 results banked
Every result (13)
| Sampled | Result as published | Reads as |
|---|---|---|
| 25 Mar 2026, 14:02 | 8.11 | 8.11 |
| 12 Feb 2026, 10:20 | 8.06 | 8.06 |
| 6 Jan 2026, 13:40 | 8.05 | 8.05 |
| 1 Dec 2025, 14:48 | 8 | 8 |
| 2 Jun 2025, 13:45 | 7.62 | 7.62 |
| 2 Apr 2025, 12:27 | 8.21 | 8.21 |
| 10 Mar 2025, 10:46 | 8.05 | 8.05 |
| 10 Feb 2025, 10:11 | 8.17 | 8.17 |
| 24 Jan 2025, 10:56 | 8.02 | 8.02 |
| 4 Dec 2024, 14:08 | 8.14 | 8.14 |
| 5 Nov 2024, 11:02 | 7.98 | 7.98 |
| 9 Oct 2024, 09:11 | 7.85 | 7.85 |
| 3 Jun 2024, 08:43 | 7.82 | 7.82 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 25 Mar 2026, 6 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 25 Mar 2026, 14:02 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Feb 2026, 10:20 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Jan 2026, 13:40 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Dec 2025, 14:48 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Jun 2025, 13:45 | 2.3 | 2.3 mg/l |
| 10 Mar 2025, 10:46 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Feb 2025, 10:11 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Jan 2025, 10:56 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Dec 2024, 14:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Nov 2024, 11:02 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Oct 2024, 09:11 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Jun 2024, 08:43 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
12 mg/l
Sampled 25 Mar 2026, 6 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 25 Mar 2026, 14:02 | 12 | 12 mg/l |
| 12 Feb 2026, 10:20 | 19 | 19 mg/l |
| 6 Jan 2026, 13:40 | 24 | 24 mg/l |
| 1 Dec 2025, 14:48 | 32 | 32 mg/l |
| 2 Jun 2025, 13:45 | 16.4 | 16.4 mg/l |
| 10 Mar 2025, 10:46 | 12 | 12 mg/l |
| 10 Feb 2025, 10:11 | 15 | 15 mg/l |
| 24 Jan 2025, 10:56 | 12 | 12 mg/l |
| 4 Dec 2024, 14:08 | 15 | 15 mg/l |
| 5 Nov 2024, 11:02 | 8.58 | 8.58 mg/l |
| 9 Oct 2024, 09:11 | 19 | 19 mg/l |
| 3 Jun 2024, 08:43 | 7.24 | 7.24 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.04 mg/l
Sampled 25 Mar 2026, 6 months ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 25 Mar 2026, 14:02 | 0.04 | 0.04 mg/l |
| 12 Feb 2026, 10:20 | 0.052 | 0.052 mg/l |
| 6 Jan 2026, 13:40 | 0.082 | 0.082 mg/l |
| 1 Dec 2025, 14:48 | 0.058 | 0.058 mg/l |
| 2 Jun 2025, 13:45 | 2.4 | 2.4 mg/l |
| 10 Mar 2025, 10:46 | 0.042 | 0.042 mg/l |
| 10 Feb 2025, 10:11 | 0.047 | 0.047 mg/l |
| 24 Jan 2025, 10:56 | 0.06 | 0.06 mg/l |
| 4 Dec 2024, 14:08 | 0.068 | 0.068 mg/l |
| 5 Nov 2024, 11:02 | 0.08 | 0.08 mg/l |
| 9 Oct 2024, 09:11 | 0.074 | 0.074 mg/l |
| 3 Jun 2024, 08:43 | 0.077 | 0.077 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
845 µS/cm
Sampled 25 Mar 2026, 6 months ago · 13 results banked
Every result (13)
| Sampled | Result as published | Reads as |
|---|---|---|
| 25 Mar 2026, 14:02 | 845 | 845 µS/cm |
| 12 Feb 2026, 10:20 | 704 | 704 µS/cm |
| 6 Jan 2026, 13:40 | 940 | 940 µS/cm |
| 1 Dec 2025, 14:48 | 879 | 879 µS/cm |
| 2 Jun 2025, 13:45 | 1085 | 1085 µS/cm |
| 2 Apr 2025, 12:27 | 906 | 906 µS/cm |
| 10 Mar 2025, 10:46 | 928 | 928 µS/cm |
| 10 Feb 2025, 10:11 | 867 | 867 µS/cm |
| 24 Jan 2025, 10:56 | 921 | 921 µS/cm |
| 4 Dec 2024, 14:08 | 870 | 870 µS/cm |
| 5 Nov 2024, 11:02 | 912 | 912 µS/cm |
| 9 Oct 2024, 09:11 | 678 | 678 µS/cm |
| 3 Jun 2024, 08:43 | 961 | 961 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 | 13 | Jun 2024 – Mar 2026 | 118.5% 25 Mar 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 13 | Jun 2024 – Mar 2026 | 13.6 mg/l 25 Mar 2026 |
| Temperature of Water 0076 | River water | 13 | Jun 2024 – Mar 2026 | 9.1 °C 25 Mar 2026 |
| pH 0061 | River water | 13 | Jun 2024 – Mar 2026 | 8.11 25 Mar 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 12 | Jun 2024 – Mar 2026 | below 0.03 mg/l 25 Mar 2026 |
| Nitrate as N 0117 | River water | 12 | Jun 2024 – Mar 2026 | 12 mg/l 25 Mar 2026 |
| Orthophosphate, reactive as P 0180 | River water | 12 | Jun 2024 – Mar 2026 | 0.04 mg/l 25 Mar 2026 |
| Conductivity at 25 C 0077 | River water | 13 | Jun 2024 – Mar 2026 | 845 µS/cm 25 Mar 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 12 | Jun 2024 – Mar 2026 | 240 mg/l 25 Mar 2026 |
| Ammonia un-ionised as N 0119 | River water | 12 | Jun 2024 – Mar 2026 | below 0.00051 mg/l 25 Mar 2026 |
| BOD : 5 Day ATU 0085 | River water | 11 | Jun 2024 – Mar 2026 | 1.6 mg/l 25 Mar 2026 |
| Nitrite as N 0118 | River water | 12 | Jun 2024 – Mar 2026 | 0.017 mg/l 25 Mar 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 12 | Jun 2024 – Mar 2026 | 12 mg/l 25 Mar 2026 |
| No flow /No sample 7668 | River water | 9 | Jul 2024 – Nov 2025 | No flow/discharge at sampling point 7 Nov 2025 |
| Solids, Suspended at 105 C 0135 | River water | 14 | Apr 2024 – Mar 2026 | 6.9 mg/l 25 Mar 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.