Tetbury Avon downstream of Stream Support
EA name: TETBURY AVON D/S STREAM SUPPORT
Environment Agency sampling point SW-Z6540110 · 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
- 6 Mar 2026, 09:507 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
- 20 since 22 Jul 2024 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 389519, 192535As published, to the nearest 1 m. Open in a map
- River, by its own name
- Tetbury Avon
- River, by the map
- River Avon (Tetbury Branch)Placed on a river whose name partly matches its own, 1 m from the line.
- Next gauge downstream
- Brokenborough On the Tetbury Avon · 6.5 km along the river
- Why it was sampled
- Monitoring (national agency policy) (20 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
97.9%
Sampled 6 Mar 2026, 7 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 Mar 2026, 09:50 | 97.9 | 97.9% |
| 9 Feb 2026, 08:58 | 94 | 94% |
| 19 Jan 2026, 11:03 | 96.4 | 96.4% |
| 10 Dec 2025, 09:22 | 92.2 | 92.2% |
| 18 Nov 2025, 11:56 | 96.3 | 96.3% |
| 23 Oct 2025, 08:23 | 83.4 | 83.4% |
| 22 Aug 2025, 10:57 | 71.1 | 71.1% |
| 30 Jul 2025, 10:17 | 74.1 | 74.1% |
| 27 Jun 2025, 08:41 | 53.5 | 53.5% |
| 30 May 2025, 08:09 | 65.2 | 65.2% |
| 28 Apr 2025, 10:36 | 87.5 | 87.5% |
| 12 Mar 2025, 09:34 | 96.8 | 96.8% |
| 10 Feb 2025, 10:24 | 97.8 | 97.8% |
| 22 Jan 2025, 10:08 | 95.8 | 95.8% |
| 10 Dec 2024, 11:13 | 94.8 | 94.8% |
| 19 Nov 2024, 14:46 | 92.1 | 92.1% |
| 18 Oct 2024, 12:39 | 95.8 | 95.8% |
| 17 Sep 2024, 11:43 | 68.9 | 68.9% |
| 27 Aug 2024, 09:38 | 61.1 | 61.1% |
| 22 Jul 2024, 11:13 | 82.6 | 82.6% |
Dissolved oxygen
as O2 · code 9924 · mg/l
11.1 mg/l
Sampled 6 Mar 2026, 7 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 Mar 2026, 09:50 | 11.1 | 11.1 mg/l |
| 9 Feb 2026, 08:58 | 10.8 | 10.8 mg/l |
| 19 Jan 2026, 11:03 | 10.9 | 10.9 mg/l |
| 10 Dec 2025, 09:22 | 10.5 | 10.5 mg/l |
| 18 Nov 2025, 11:56 | 10.7 | 10.7 mg/l |
| 23 Oct 2025, 08:23 | 9.24 | 9.24 mg/l |
| 22 Aug 2025, 10:57 | 7.59 | 7.59 mg/l |
| 30 Jul 2025, 10:17 | 7.81 | 7.81 mg/l |
| 27 Jun 2025, 08:41 | 5.67 | 5.67 mg/l |
| 30 May 2025, 08:09 | 6.93 | 6.93 mg/l |
| 28 Apr 2025, 10:36 | 9.7 | 9.7 mg/l |
| 12 Mar 2025, 09:34 | 11.6 | 11.6 mg/l |
| 10 Feb 2025, 10:24 | 11.5 | 11.5 mg/l |
| 22 Jan 2025, 10:08 | 11 | 11 mg/l |
| 10 Dec 2024, 11:13 | 10.8 | 10.8 mg/l |
| 19 Nov 2024, 14:46 | 10.7 | 10.7 mg/l |
| 18 Oct 2024, 12:39 | 10.4 | 10.4 mg/l |
| 17 Sep 2024, 11:43 | 7.29 | 7.29 mg/l |
| 27 Aug 2024, 09:38 | 6.51 | 6.51 mg/l |
| 22 Jul 2024, 11:13 | 8.78 | 8.78 mg/l |
Water temperature
code 0076 · °C
9.9 °C
Sampled 6 Mar 2026, 7 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 Mar 2026, 09:50 | 9.9 | 9.9 °C |
| 9 Feb 2026, 08:58 | 9.3 | 9.3 °C |
| 19 Jan 2026, 11:03 | 9.8 | 9.8 °C |
| 10 Dec 2025, 09:22 | 9.7 | 9.7 °C |
| 18 Nov 2025, 11:56 | 10.5 | 10.5 °C |
| 23 Oct 2025, 08:23 | 10.7 | 10.7 °C |
| 22 Aug 2025, 10:57 | 12.3 | 12.3 °C |
| 30 Jul 2025, 10:17 | 12.9 | 12.9 °C |
| 27 Jun 2025, 08:41 | 12.6 | 12.6 °C |
| 30 May 2025, 08:09 | 12.5 | 12.5 °C |
| 28 Apr 2025, 10:36 | 10.7 | 10.7 °C |
| 12 Mar 2025, 09:34 | 7.6 | 7.6 °C |
| 10 Feb 2025, 10:24 | 8.3 | 8.3 °C |
| 22 Jan 2025, 10:08 | 9.1 | 9.1 °C |
| 10 Dec 2024, 11:13 | 9.5 | 9.5 °C |
| 19 Nov 2024, 14:46 | 8.7 | 8.7 °C |
| 18 Oct 2024, 12:39 | 11.7 | 11.7 °C |
| 17 Sep 2024, 11:43 | 12.7 | 12.7 °C |
| 27 Aug 2024, 09:38 | 12.4 | 12.4 °C |
| 22 Jul 2024, 11:13 | 12.5 | 12.5 °C |
pH
code 0061
7.79
Sampled 6 Mar 2026, 7 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 Mar 2026, 09:50 | 7.79 | 7.79 |
| 9 Feb 2026, 08:58 | 7.73 | 7.73 |
| 19 Jan 2026, 11:03 | 7.77 | 7.77 |
| 10 Dec 2025, 09:22 | 7.83 | 7.83 |
| 18 Nov 2025, 11:56 | 7.79 | 7.79 |
| 23 Oct 2025, 08:23 | 7.2 | 7.2 |
| 22 Aug 2025, 10:57 | 7.17 | 7.17 |
| 30 Jul 2025, 10:17 | 7.48 | 7.48 |
| 27 Jun 2025, 08:41 | 7.57 | 7.57 |
| 30 May 2025, 08:09 | 7.46 | 7.46 |
| 28 Apr 2025, 10:36 | 7.68 | 7.68 |
| 12 Mar 2025, 09:34 | 7.74 | 7.74 |
| 10 Feb 2025, 10:24 | 7.87 | 7.87 |
| 22 Jan 2025, 10:08 | 7.88 | 7.88 |
| 10 Dec 2024, 11:13 | 7.76 | 7.76 |
| 19 Nov 2024, 14:46 | 7.73 | 7.73 |
| 18 Oct 2024, 12:39 | 7.74 | 7.74 |
| 17 Sep 2024, 11:43 | 7.51 | 7.51 |
| 27 Aug 2024, 09:38 | 7.45 | 7.45 |
| 22 Jul 2024, 11:13 | 7.5 | 7.5 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 6 Mar 2026, 7 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 Mar 2026, 09:50 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Feb 2026, 08:58 | 0.086 | 0.086 mg/l |
| 19 Jan 2026, 11:03 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Dec 2025, 09:22 | 0.21 | 0.21 mg/l |
| 18 Nov 2025, 11:56 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Oct 2025, 08:23 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Aug 2025, 10:57 | <0.03 | below 0.03 mg/l (not detected above this) |
| 30 Jul 2025, 10:17 | <0.03 | below 0.03 mg/l (not detected above this) |
| 27 Jun 2025, 08:41 | 0.036 | 0.036 mg/l |
| 30 May 2025, 08:09 | 0.043 | 0.043 mg/l |
| 28 Apr 2025, 10:36 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Mar 2025, 09:34 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Feb 2025, 10:24 | 0.062 | 0.062 mg/l |
| 22 Jan 2025, 10:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Dec 2024, 11:13 | 0.17 | 0.17 mg/l |
| 19 Nov 2024, 14:46 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Oct 2024, 12:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Sep 2024, 11:43 | 0.049 | 0.049 mg/l |
| 27 Aug 2024, 09:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Jul 2024, 11:13 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
7.1 mg/l
Sampled 6 Mar 2026, 7 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 Mar 2026, 09:50 | 7.1 | 7.1 mg/l |
| 9 Feb 2026, 08:58 | 5.7 | 5.7 mg/l |
| 19 Jan 2026, 11:03 | 7.4 | 7.4 mg/l |
| 10 Dec 2025, 09:22 | 7.79 | 7.79 mg/l |
| 18 Nov 2025, 11:56 | 8.2 | 8.2 mg/l |
| 23 Oct 2025, 08:23 | 11 | 11 mg/l |
| 22 Aug 2025, 10:57 | 0.406 | 0.406 mg/l |
| 30 Jul 2025, 10:17 | 0.516 | 0.516 mg/l |
| 27 Jun 2025, 08:41 | 0.596 | 0.596 mg/l |
| 30 May 2025, 08:09 | 0.996 | 0.996 mg/l |
| 28 Apr 2025, 10:36 | 6.5 | 6.5 mg/l |
| 12 Mar 2025, 09:34 | 6.7 | 6.7 mg/l |
| 10 Feb 2025, 10:24 | 6.5 | 6.5 mg/l |
| 22 Jan 2025, 10:08 | 6.6 | 6.6 mg/l |
| 10 Dec 2024, 11:13 | 6.59 | 6.59 mg/l |
| 19 Nov 2024, 14:46 | 5.59 | 5.59 mg/l |
| 18 Oct 2024, 12:39 | 6.5 | 6.5 mg/l |
| 17 Sep 2024, 11:43 | 1.8 | 1.8 mg/l |
| 27 Aug 2024, 09:38 | 1.2 | 1.2 mg/l |
| 22 Jul 2024, 11:13 | 6.19 | 6.19 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.032 mg/l
Sampled 6 Mar 2026, 7 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 Mar 2026, 09:50 | 0.032 | 0.032 mg/l |
| 9 Feb 2026, 08:58 | 0.066 | 0.066 mg/l |
| 19 Jan 2026, 11:03 | 0.038 | 0.038 mg/l |
| 10 Dec 2025, 09:22 | 0.079 | 0.079 mg/l |
| 18 Nov 2025, 11:56 | 0.031 | 0.031 mg/l |
| 23 Oct 2025, 08:23 | 0.057 | 0.057 mg/l |
| 22 Aug 2025, 10:57 | <0.01 | below 0.01 mg/l (not detected above this) |
| 30 Jul 2025, 10:17 | <0.01 | below 0.01 mg/l (not detected above this) |
| 27 Jun 2025, 08:41 | 0.011 | 0.011 mg/l |
| 30 May 2025, 08:09 | <0.01 | below 0.01 mg/l (not detected above this) |
| 28 Apr 2025, 10:36 | 0.045 | 0.045 mg/l |
| 12 Mar 2025, 09:34 | 0.031 | 0.031 mg/l |
| 10 Feb 2025, 10:24 | 0.047 | 0.047 mg/l |
| 22 Jan 2025, 10:08 | 0.031 | 0.031 mg/l |
| 10 Dec 2024, 11:13 | 0.046 | 0.046 mg/l |
| 19 Nov 2024, 14:46 | 0.081 | 0.081 mg/l |
| 18 Oct 2024, 12:39 | 0.028 | 0.028 mg/l |
| 17 Sep 2024, 11:43 | 0.011 | 0.011 mg/l |
| 27 Aug 2024, 09:38 | <0.01 | below 0.01 mg/l (not detected above this) |
| 22 Jul 2024, 11:13 | 0.046 | 0.046 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
564 µS/cm
Sampled 6 Mar 2026, 7 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 6 Mar 2026, 09:50 | 564 | 564 µS/cm |
| 9 Feb 2026, 08:58 | 504 | 504 µS/cm |
| 19 Jan 2026, 11:03 | 567 | 567 µS/cm |
| 10 Dec 2025, 09:22 | 567 | 567 µS/cm |
| 18 Nov 2025, 11:56 | 584 | 584 µS/cm |
| 23 Oct 2025, 08:23 | 603 | 603 µS/cm |
| 22 Aug 2025, 10:57 | 519 | 519 µS/cm |
| 30 Jul 2025, 10:17 | 615 | 615 µS/cm |
| 27 Jun 2025, 08:41 | 658 | 658 µS/cm |
| 30 May 2025, 08:09 | 622 | 622 µS/cm |
| 28 Apr 2025, 10:36 | 613 | 613 µS/cm |
| 12 Mar 2025, 09:34 | 595 | 595 µS/cm |
| 10 Feb 2025, 10:24 | 589 | 589 µS/cm |
| 22 Jan 2025, 10:08 | 580 | 580 µS/cm |
| 10 Dec 2024, 11:13 | 590 | 590 µS/cm |
| 19 Nov 2024, 14:46 | 696 | 696 µS/cm |
| 18 Oct 2024, 12:39 | 582 | 582 µS/cm |
| 17 Sep 2024, 11:43 | 613 | 613 µS/cm |
| 27 Aug 2024, 09:38 | 611 | 611 µS/cm |
| 22 Jul 2024, 11:13 | 616 | 616 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 | 20 | Jul 2024 – Mar 2026 | 97.9% 6 Mar 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 20 | Jul 2024 – Mar 2026 | 11.1 mg/l 6 Mar 2026 |
| Temperature of Water 0076 | River water | 20 | Jul 2024 – Mar 2026 | 9.9 °C 6 Mar 2026 |
| pH 0061 | River water | 20 | Jul 2024 – Mar 2026 | 7.79 6 Mar 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 20 | Jul 2024 – Mar 2026 | below 0.03 mg/l 6 Mar 2026 |
| Nitrate as N 0117 | River water | 20 | Jul 2024 – Mar 2026 | 7.1 mg/l 6 Mar 2026 |
| Orthophosphate, reactive as P 0180 | River water | 20 | Jul 2024 – Mar 2026 | 0.032 mg/l 6 Mar 2026 |
| Conductivity at 25 C 0077 | River water | 20 | Jul 2024 – Mar 2026 | 564 µS/cm 6 Mar 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 20 | Jul 2024 – Mar 2026 | 240 mg/l 6 Mar 2026 |
| Ammonia un-ionised as N 0119 | River water | 20 | Jul 2024 – Mar 2026 | below 0.00034 mg/l 6 Mar 2026 |
| BOD : 5 Day ATU 0085 | River water | 19 | Jul 2024 – Mar 2026 | below 1 mg/l 6 Mar 2026 |
| Nitrite as N 0118 | River water | 20 | Jul 2024 – Mar 2026 | below 0.004 mg/l 6 Mar 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 20 | Jul 2024 – Mar 2026 | 7.1 mg/l 6 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.