Helmdon Brook Helmdon Road Bridge
EA name: HELMDON BK.HELMDON RD.BR.
Environment Agency sampling point AN-04M17 · 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
- 7 Sep 2026, 17:5431 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 12 since 5 Oct 2023 Imported periods: 1 Oct 2023 – 8 Oct 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Monitoring (national agency policy) · results completed 9 Sep 2026
- Where
- National Grid 458736, 243799As published, to the nearest 1 m. Open in a map
- River, by its own name
- Its name does not give one
- River, by the map
- River TovePlaced by position alone, on a line whose map name differs from its own, 13 m from the line.
- Next gauge downstream
- Towcester On the River Tove · 14 km along the river
- Why it was sampled
- Environmental monitoring statutory (EU directives) (6 samples)
Monitoring (national agency policy) (6 samples)
Results here were completed a median of 2 days after the sample was taken (2 to 4 days, 4 samples). 4 visits found no water to sample (recorded as “No flow”).
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
92.8%
Sampled 12 Jun 2026, 4 months ago · 8 results banked
Every result (8)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Jun 2026, 11:51 | 92.8 | 92.8% |
| 28 May 2026, 10:09 | 89.8 | 89.8% |
| 16 Apr 2026, 14:23 | 102.4 | 102.4% |
| 1 Mar 2024, 12:37 | 95.9 | 95.9% |
| 5 Feb 2024, 15:54 | 97 | 97% |
| 4 Jan 2024, 11:52 | 95 | 95% |
| 4 Dec 2023, 10:42 | 93.6 | 93.6% |
| 13 Nov 2023, 11:54 | 92.5 | 92.5% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.44 mg/l
Sampled 12 Jun 2026, 4 months ago · 8 results banked
Every result (8)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Jun 2026, 11:51 | 9.44 | 9.44 mg/l |
| 28 May 2026, 10:09 | 8.94 | 8.94 mg/l |
| 16 Apr 2026, 14:23 | 11 | 11 mg/l |
| 1 Mar 2024, 12:37 | 11.8 | 11.8 mg/l |
| 5 Feb 2024, 15:54 | 11.3 | 11.3 mg/l |
| 4 Jan 2024, 11:52 | 11.4 | 11.4 mg/l |
| 4 Dec 2023, 10:42 | 11.5 | 11.5 mg/l |
| 13 Nov 2023, 11:54 | 10.4 | 10.4 mg/l |
Water temperature
code 0076 · °C
14.5 °C
Sampled 12 Jun 2026, 4 months ago · 8 results banked
Every result (8)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Jun 2026, 11:51 | 14.5 | 14.5 °C |
| 28 May 2026, 10:09 | 15.5 | 15.5 °C |
| 16 Apr 2026, 14:23 | 11.9 | 11.9 °C |
| 1 Mar 2024, 12:37 | 6.5 | 6.5 °C |
| 5 Feb 2024, 15:54 | 8.6 | 8.6 °C |
| 4 Jan 2024, 11:52 | 7.3 | 7.3 °C |
| 4 Dec 2023, 10:42 | 6.4 | 6.4 °C |
| 13 Nov 2023, 11:54 | 9.9 | 9.9 °C |
pH
code 0061
8.22
Sampled 12 Jun 2026, 4 months ago · 8 results banked
Every result (8)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Jun 2026, 11:51 | 8.22 | 8.22 |
| 28 May 2026, 10:09 | 8.16 | 8.16 |
| 16 Apr 2026, 14:23 | 8.56 | 8.56 |
| 1 Mar 2024, 12:37 | 7.87 | 7.87 |
| 5 Feb 2024, 15:54 | 8.22 | 8.22 |
| 4 Jan 2024, 11:52 | 7.96 | 7.96 |
| 4 Dec 2023, 10:42 | 7.77 | 7.77 |
| 13 Nov 2023, 11:54 | 7.79 | 7.79 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 12 Jun 2026, 4 months ago · 8 results banked
Every result (8)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Jun 2026, 11:51 | <0.03 | below 0.03 mg/l (not detected above this) |
| 28 May 2026, 10:09 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Apr 2026, 14:23 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Mar 2024, 12:37 | 0.23 | 0.23 mg/l |
| 5 Feb 2024, 15:54 | 0.032 | 0.032 mg/l |
| 4 Jan 2024, 11:52 | 0.17 | 0.17 mg/l |
| 4 Dec 2023, 10:42 | 0.053 | 0.053 mg/l |
| 13 Nov 2023, 11:54 | 0.032 | 0.032 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
8.38 mg/l
Sampled 12 Jun 2026, 4 months ago · 7 results banked
Every result (7)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Jun 2026, 11:51 | 8.38 | 8.38 mg/l |
| 28 May 2026, 10:09 | 14.9 | 14.9 mg/l |
| 16 Apr 2026, 14:23 | 6.76 | 6.76 mg/l |
| 1 Mar 2024, 12:37 | 3.08 | 3.08 mg/l |
| 4 Jan 2024, 11:52 | 4.38 | 4.38 mg/l |
| 4 Dec 2023, 10:42 | 5.29 | 5.29 mg/l |
| 13 Nov 2023, 11:54 | 5.89 | 5.89 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.069 mg/l
Sampled 12 Jun 2026, 4 months ago · 8 results banked
Every result (8)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Jun 2026, 11:51 | 0.069 | 0.069 mg/l |
| 28 May 2026, 10:09 | 0.089 | 0.089 mg/l |
| 16 Apr 2026, 14:23 | 0.028 | 0.028 mg/l |
| 1 Mar 2024, 12:37 | 0.065 | 0.065 mg/l |
| 5 Feb 2024, 15:54 | 0.039 | 0.039 mg/l |
| 4 Jan 2024, 11:52 | 0.051 | 0.051 mg/l |
| 4 Dec 2023, 10:42 | 0.11 | 0.11 mg/l |
| 13 Nov 2023, 11:54 | 0.086 | 0.086 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
744 µS/cm
Sampled 12 Jun 2026, 4 months ago · 8 results banked
Every result (8)
| Sampled | Result as published | Reads as |
|---|---|---|
| 12 Jun 2026, 11:51 | 744 | 744 µS/cm |
| 28 May 2026, 10:09 | 829 | 829 µS/cm |
| 16 Apr 2026, 14:23 | 726 | 726 µS/cm |
| 1 Mar 2024, 12:37 | 452 | 452 µS/cm |
| 5 Feb 2024, 15:54 | 814 | 814 µS/cm |
| 4 Jan 2024, 11:52 | 623 | 623 µS/cm |
| 4 Dec 2023, 10:42 | 445 | 445 µS/cm |
| 13 Nov 2023, 11:54 | 523 | 523 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 | 8 | Nov 2023 – Jun 2026 | 92.8% 12 Jun 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 8 | Nov 2023 – Jun 2026 | 9.44 mg/l 12 Jun 2026 |
| Temperature of Water 0076 | River water | 8 | Nov 2023 – Jun 2026 | 14.5 °C 12 Jun 2026 |
| pH 0061 | River water | 8 | Nov 2023 – Jun 2026 | 8.22 12 Jun 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 8 | Nov 2023 – Jun 2026 | below 0.03 mg/l 12 Jun 2026 |
| Nitrate as N 0117 | River water | 7 | Nov 2023 – Jun 2026 | 8.38 mg/l 12 Jun 2026 |
| Orthophosphate, reactive as P 0180 | River water | 8 | Nov 2023 – Jun 2026 | 0.069 mg/l 12 Jun 2026 |
| Conductivity at 25 C 0077 | River water | 8 | Nov 2023 – Jun 2026 | 744 µS/cm 12 Jun 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 8 | Nov 2023 – Jun 2026 | 230 mg/l 12 Jun 2026 |
| Ammonia un-ionised as N 0119 | River water | 8 | Nov 2023 – Jun 2026 | below 0.00076 mg/l 12 Jun 2026 |
| Nitrite as N 0118 | River water | 7 | Nov 2023 – Jun 2026 | 0.016 mg/l 12 Jun 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 8 | Nov 2023 – Jun 2026 | 8.4 mg/l 12 Jun 2026 |
| No flow /No sample 7668 | River water | 4 | Oct 2023 – Sep 2026 | No flow/discharge at sampling point 7 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.