Hampshire Avon at Netheravon (downstream of sewage treatment works)
EA name: HAMPSHIRE AVON AT NETHERAVON (D/S STW) (also listed as “HAMPSHIRE AVON AT NETHERAVON DOWNSTREAM OF NETHERAVON STW”)
Environment Agency sampling point SW-50210456 · 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 Mar 2026, 11:168 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 25 Oct 2026 and had nothing newer.
- Samples banked
- 18 since 12 Oct 2023 Imported periods: 1 Oct 2023 – 25 Oct 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Environmental monitoring statutory (EU directives)
- Where
- National Grid 415407, 147908As published, to the nearest 1 m. Open in a map
- River, by its own name
- Hampshire Avon
- River, by the map
- River AvonPlaced on a river whose name partly matches its own, 6 m from the line.
- Next gauge downstream
- Amesbury On the River Avon · 12 km along the river (the path rests on a repair to the map)
- Nearest gauge upstream
- Upavon East On the River Avon · 12 km along the riverUpavon West On the River Avon · 12 km along the river
- Why it was sampled
- Environmental monitoring statutory (EU directives) (12 samples)
Monitoring (national agency policy) (6 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
98.8%
Sampled 5 Mar 2026, 8 months ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Mar 2026, 11:16 | 98.8 | 98.8% |
| 2 Feb 2026, 10:08 | 88.5 | 88.5% |
| 7 Jan 2026, 13:08 | 97.9 | 97.9% |
| 2 Dec 2025, 11:45 | 95.1 | 95.1% |
| 4 Nov 2025, 10:47 | 96.8 | 96.8% |
| 10 Oct 2025, 11:26 | 96 | 96% |
| 26 Sep 2025, 13:10 | 104.4 | 104.4% |
| 21 Aug 2025, 10:26 | 108.8 | 108.8% |
| 25 Jul 2025, 12:24 | 118.1 | 118.1% |
| 18 Jun 2025, 13:42 | 114.6 | 114.6% |
| 23 May 2025, 12:38 | 122.1 | 122.1% |
| 9 Apr 2025, 10:53 | 103.1 | 103.1% |
| 4 Mar 2024, 11:58 | 97.6 | 97.6% |
| 1 Feb 2024, 11:42 | 94.4 | 94.4% |
| 12 Jan 2024, 11:46 | 91.4 | 91.4% |
| 4 Dec 2023, 13:30 | 86.2 | 86.2% |
| 14 Nov 2023, 11:07 | 83.2 | 83.2% |
| 12 Oct 2023, 12:19 | 88.8 | 88.8% |
Dissolved oxygen
as O2 · code 9924 · mg/l
11.2 mg/l
Sampled 5 Mar 2026, 8 months ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Mar 2026, 11:16 | 11.2 | 11.2 mg/l |
| 2 Feb 2026, 10:08 | 10.4 | 10.4 mg/l |
| 7 Jan 2026, 13:08 | 12.2 | 12.2 mg/l |
| 2 Dec 2025, 11:45 | 11.1 | 11.1 mg/l |
| 4 Nov 2025, 10:47 | 10.3 | 10.3 mg/l |
| 10 Oct 2025, 11:26 | 10.2 | 10.2 mg/l |
| 26 Sep 2025, 13:10 | 11.6 | 11.6 mg/l |
| 21 Aug 2025, 10:26 | 11.1 | 11.1 mg/l |
| 25 Jul 2025, 12:24 | 11.3 | 11.3 mg/l |
| 18 Jun 2025, 13:42 | 10.7 | 10.7 mg/l |
| 23 May 2025, 12:38 | 12.7 | 12.7 mg/l |
| 9 Apr 2025, 10:53 | 11.7 | 11.7 mg/l |
| 4 Mar 2024, 11:58 | 11.6 | 11.6 mg/l |
| 1 Feb 2024, 11:42 | 10.9 | 10.9 mg/l |
| 12 Jan 2024, 11:46 | 11 | 11 mg/l |
| 4 Dec 2023, 13:30 | 9.92 | 9.92 mg/l |
| 14 Nov 2023, 11:07 | 9.33 | 9.33 mg/l |
| 12 Oct 2023, 12:19 | 9.21 | 9.21 mg/l |
Water temperature
code 0076 · °C
9.9 °C
Sampled 5 Mar 2026, 8 months ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Mar 2026, 11:16 | 9.9 | 9.9 °C |
| 2 Feb 2026, 10:08 | 8.1 | 8.1 °C |
| 7 Jan 2026, 13:08 | 5.9 | 5.9 °C |
| 2 Dec 2025, 11:45 | 8.7 | 8.7 °C |
| 4 Nov 2025, 10:47 | 12.3 | 12.3 °C |
| 10 Oct 2025, 11:26 | 12.5 | 12.5 °C |
| 26 Sep 2025, 13:10 | 10.6 | 10.6 °C |
| 21 Aug 2025, 10:26 | 14.3 | 14.3 °C |
| 25 Jul 2025, 12:24 | 17.4 | 17.4 °C |
| 18 Jun 2025, 13:42 | 18.5 | 18.5 °C |
| 23 May 2025, 12:38 | 13.4 | 13.4 °C |
| 9 Apr 2025, 10:53 | 9.6 | 9.6 °C |
| 4 Mar 2024, 11:58 | 7.7 | 7.7 °C |
| 1 Feb 2024, 11:42 | 8.8 | 8.8 °C |
| 12 Jan 2024, 11:46 | 7.4 | 7.4 °C |
| 4 Dec 2023, 13:30 | 9.1 | 9.1 °C |
| 14 Nov 2023, 11:07 | 10.2 | 10.2 °C |
| 12 Oct 2023, 12:19 | 13.6 | 13.6 °C |
pH
code 0061
7.67
Sampled 5 Mar 2026, 8 months ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Mar 2026, 11:16 | 7.67 | 7.67 |
| 2 Feb 2026, 10:08 | 7.93 | 7.93 |
| 7 Jan 2026, 13:08 | 8.04 | 8.04 |
| 2 Dec 2025, 11:45 | 8.04 | 8.04 |
| 4 Nov 2025, 10:47 | 8.06 | 8.06 |
| 10 Oct 2025, 11:26 | 8.1 | 8.1 |
| 26 Sep 2025, 13:10 | 8.36 | 8.36 |
| 21 Aug 2025, 10:26 | 8.24 | 8.24 |
| 25 Jul 2025, 12:24 | 8.27 | 8.27 |
| 18 Jun 2025, 13:42 | 8.21 | 8.21 |
| 23 May 2025, 12:38 | 8.23 | 8.23 |
| 9 Apr 2025, 10:53 | 8.03 | 8.03 |
| 4 Mar 2024, 11:58 | 7.86 | 7.86 |
| 1 Feb 2024, 11:42 | 7.83 | 7.83 |
| 12 Jan 2024, 11:46 | 7.84 | 7.84 |
| 4 Dec 2023, 13:30 | 7.81 | 7.81 |
| 14 Nov 2023, 11:07 | 7.76 | 7.76 |
| 12 Oct 2023, 12:19 | 7.87 | 7.87 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 5 Mar 2026, 8 months ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Mar 2026, 11:16 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Feb 2026, 10:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Jan 2026, 13:08 | 0.062 | 0.062 mg/l |
| 2 Dec 2025, 11:45 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Nov 2025, 10:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Oct 2025, 11:26 | <0.03 | below 0.03 mg/l (not detected above this) |
| 26 Sep 2025, 13:10 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 Aug 2025, 10:26 | 0.85 | 0.85 mg/l |
| 25 Jul 2025, 12:24 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Jun 2025, 13:42 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 May 2025, 12:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Apr 2025, 10:53 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Mar 2024, 11:58 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Feb 2024, 11:42 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Jan 2024, 11:46 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Dec 2023, 13:30 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Nov 2023, 11:07 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Oct 2023, 12:19 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
6.19 mg/l
Sampled 5 Mar 2026, 8 months ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Mar 2026, 11:16 | 6.19 | 6.19 mg/l |
| 2 Feb 2026, 10:08 | 5.19 | 5.19 mg/l |
| 7 Jan 2026, 13:08 | 6.86 | 6.86 mg/l |
| 2 Dec 2025, 11:45 | 5.26 | 5.26 mg/l |
| 4 Nov 2025, 10:47 | 5.79 | 5.79 mg/l |
| 10 Oct 2025, 11:26 | 6.58 | 6.58 mg/l |
| 26 Sep 2025, 13:10 | 7.09 | 7.09 mg/l |
| 21 Aug 2025, 10:26 | 7.18 | 7.18 mg/l |
| 25 Jul 2025, 12:24 | 6.98 | 6.98 mg/l |
| 18 Jun 2025, 13:42 | 6.98 | 6.98 mg/l |
| 23 May 2025, 12:38 | 6.98 | 6.98 mg/l |
| 9 Apr 2025, 10:53 | 7.08 | 7.08 mg/l |
| 4 Mar 2024, 11:58 | 5.78 | 5.78 mg/l |
| 1 Feb 2024, 11:42 | 6.88 | 6.88 mg/l |
| 12 Jan 2024, 11:46 | 5.98 | 5.98 mg/l |
| 4 Dec 2023, 13:30 | 5.38 | 5.38 mg/l |
| 14 Nov 2023, 11:07 | 5.28 | 5.28 mg/l |
| 12 Oct 2023, 12:19 | 6.19 | 6.19 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.098 mg/l
Sampled 5 Mar 2026, 8 months ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Mar 2026, 11:16 | 0.098 | 0.098 mg/l |
| 2 Feb 2026, 10:08 | 0.15 | 0.15 mg/l |
| 7 Jan 2026, 13:08 | 0.11 | 0.11 mg/l |
| 2 Dec 2025, 11:45 | 0.16 | 0.16 mg/l |
| 4 Nov 2025, 10:47 | 0.14 | 0.14 mg/l |
| 10 Oct 2025, 11:26 | 0.15 | 0.15 mg/l |
| 26 Sep 2025, 13:10 | 0.14 | 0.14 mg/l |
| 21 Aug 2025, 10:26 | 0.15 | 0.15 mg/l |
| 25 Jul 2025, 12:24 | 0.13 | 0.13 mg/l |
| 18 Jun 2025, 13:42 | 0.13 | 0.13 mg/l |
| 23 May 2025, 12:38 | 0.11 | 0.11 mg/l |
| 9 Apr 2025, 10:53 | 0.074 | 0.074 mg/l |
| 4 Mar 2024, 11:58 | 0.14 | 0.14 mg/l |
| 1 Feb 2024, 11:42 | 0.12 | 0.12 mg/l |
| 12 Jan 2024, 11:46 | 0.12 | 0.12 mg/l |
| 4 Dec 2023, 13:30 | 0.17 | 0.17 mg/l |
| 14 Nov 2023, 11:07 | 0.17 | 0.17 mg/l |
| 12 Oct 2023, 12:19 | 0.14 | 0.14 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
602 µS/cm
Sampled 5 Mar 2026, 8 months ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 5 Mar 2026, 11:16 | 602 | 602 µS/cm |
| 2 Feb 2026, 10:08 | 554 | 554 µS/cm |
| 7 Jan 2026, 13:08 | 644 | 644 µS/cm |
| 2 Dec 2025, 11:45 | 646 | 646 µS/cm |
| 4 Nov 2025, 10:47 | 675 | 675 µS/cm |
| 10 Oct 2025, 11:26 | 660 | 660 µS/cm |
| 26 Sep 2025, 13:10 | 650 | 650 µS/cm |
| 21 Aug 2025, 10:26 | 663 | 663 µS/cm |
| 25 Jul 2025, 12:24 | 691 | 691 µS/cm |
| 18 Jun 2025, 13:42 | 624 | 624 µS/cm |
| 23 May 2025, 12:38 | 629 | 629 µS/cm |
| 9 Apr 2025, 10:53 | 614 | 614 µS/cm |
| 4 Mar 2024, 11:58 | 576 | 576 µS/cm |
| 1 Feb 2024, 11:42 | 622 | 622 µS/cm |
| 12 Jan 2024, 11:46 | 604 | 604 µS/cm |
| 4 Dec 2023, 13:30 | 513 | 513 µS/cm |
| 14 Nov 2023, 11:07 | 595 | 595 µS/cm |
| 12 Oct 2023, 12:19 | 643 | 643 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 | 18 | Oct 2023 – Mar 2026 | 98.8% 5 Mar 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 18 | Oct 2023 – Mar 2026 | 11.2 mg/l 5 Mar 2026 |
| Temperature of Water 0076 | River water | 18 | Oct 2023 – Mar 2026 | 9.9 °C 5 Mar 2026 |
| pH 0061 | River water | 18 | Oct 2023 – Mar 2026 | 7.67 5 Mar 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 18 | Oct 2023 – Mar 2026 | below 0.03 mg/l 5 Mar 2026 |
| Nitrate as N 0117 | River water | 18 | Oct 2023 – Mar 2026 | 6.19 mg/l 5 Mar 2026 |
| Orthophosphate, reactive as P 0180 | River water | 18 | Oct 2023 – Mar 2026 | 0.098 mg/l 5 Mar 2026 |
| Conductivity at 25 C 0077 | River water | 18 | Oct 2023 – Mar 2026 | 602 µS/cm 5 Mar 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 18 | Oct 2023 – Mar 2026 | 260 mg/l 5 Mar 2026 |
| Ammonia un-ionised as N 0119 | River water | 18 | Oct 2023 – Mar 2026 | below 0.00026 mg/l 5 Mar 2026 |
| Nitrite as N 0118 | River water | 18 | Oct 2023 – Mar 2026 | 0.014 mg/l 5 Mar 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 18 | Oct 2023 – Mar 2026 | 6.2 mg/l 5 Mar 2026 |
| Solids, Suspended at 105 C 0135 | River water | 6 | Oct 2023 – Mar 2024 | 7.9 mg/l 4 Mar 2024 |
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.