River Yeo Thornford
EA name: R YEO THORNFORD
Environment Agency sampling point SW-E4002500 · 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
- 22 Sep 2026, 12:1934 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 18 since 8 Apr 2025 Imported periods: 1 Oct 2023 – 26 Oct 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Environmental monitoring statutory (EU directives) · results completed 6 Oct 2026
- Where
- National Grid 360315, 113806As published, to the nearest 1 m. Open in a map
- River, by its own name
- Yeo
- River, by the map
- River IvelPlaced on the river its name gives, 16 m from the line.
- Next gauge downstream
- Pen Mill On the River Yeo · 8.0 km along the river
- Nearest gauge upstream
- Sherborne Lake On the River Yeo · 5.7 km along the river
- Why it was sampled
- Environmental monitoring statutory (EU directives) (18 samples)
Results here were completed a median of 4 days after the sample was taken (3 to 14 days, 4 samples).
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
72.8%
Sampled 22 Sep 2026, 34 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 22 Sep 2026, 12:19 | 72.8 | 72.8% |
| 11 Aug 2026, 10:45 | 74.9 | 74.9% |
| 13 Jul 2026, 10:56 | 83.4 | 83.4% |
| 26 Jun 2026, 10:43 | 73.2 | 73.2% |
| 13 May 2026, 11:55 | 87.1 | 87.1% |
| 22 Apr 2026, 11:04 | 92.3 | 92.3% |
| 24 Mar 2026, 09:27 | 97.8 | 97.8% |
| 13 Feb 2026, 08:48 | 94.2 | 94.2% |
| 16 Jan 2026, 10:42 | 93.4 | 93.4% |
| 10 Dec 2025, 11:05 | 88 | 88% |
| 5 Nov 2025, 11:40 | 80.5 | 80.5% |
| 9 Oct 2025, 08:58 | 81.2 | 81.2% |
| 11 Sep 2025, 11:36 | 81.8 | 81.8% |
| 8 Aug 2025, 11:13 | 83.9 | 83.9% |
| 23 Jul 2025, 12:00 | 79.6 | 79.6% |
| 25 Jun 2025, 09:01 | 88.2 | 88.2% |
| 30 May 2025, 12:41 | 85.1 | 85.1% |
| 8 Apr 2025, 11:00 | 97.8 | 97.8% |
Dissolved oxygen
as O2 · code 9924 · mg/l
7.05 mg/l
Sampled 22 Sep 2026, 34 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 22 Sep 2026, 12:19 | 7.05 | 7.05 mg/l |
| 11 Aug 2026, 10:45 | 7.09 | 7.09 mg/l |
| 13 Jul 2026, 10:56 | 7.72 | 7.72 mg/l |
| 26 Jun 2026, 10:43 | 6.37 | 6.37 mg/l |
| 13 May 2026, 11:55 | 9.37 | 9.37 mg/l |
| 22 Apr 2026, 11:04 | 10.1 | 10.1 mg/l |
| 24 Mar 2026, 09:27 | 11 | 11 mg/l |
| 13 Feb 2026, 08:48 | 11.2 | 11.2 mg/l |
| 16 Jan 2026, 10:42 | 11.3 | 11.3 mg/l |
| 10 Dec 2025, 11:05 | 9.84 | 9.84 mg/l |
| 5 Nov 2025, 11:40 | 8.35 | 8.35 mg/l |
| 9 Oct 2025, 08:58 | 8.85 | 8.85 mg/l |
| 11 Sep 2025, 11:36 | 8.17 | 8.17 mg/l |
| 8 Aug 2025, 11:13 | 8.1 | 8.1 mg/l |
| 23 Jul 2025, 12:00 | 7.61 | 7.61 mg/l |
| 25 Jun 2025, 09:01 | 8.63 | 8.63 mg/l |
| 30 May 2025, 12:41 | 8.2 | 8.2 mg/l |
| 8 Apr 2025, 11:00 | 10.8 | 10.8 mg/l |
Water temperature
code 0076 · °C
16.8 °C
Sampled 22 Sep 2026, 34 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 22 Sep 2026, 12:19 | 16.8 | 16.8 °C |
| 11 Aug 2026, 10:45 | 17.9 | 17.9 °C |
| 13 Jul 2026, 10:56 | 19 | 19 °C |
| 26 Jun 2026, 10:43 | 22.1 | 22.1 °C |
| 13 May 2026, 11:55 | 12 | 12 °C |
| 22 Apr 2026, 11:04 | 11.2 | 11.2 °C |
| 24 Mar 2026, 09:27 | 10.2 | 10.2 °C |
| 13 Feb 2026, 08:48 | 7.8 | 7.8 °C |
| 16 Jan 2026, 10:42 | 7 | 7 °C |
| 10 Dec 2025, 11:05 | 10.3 | 10.3 °C |
| 5 Nov 2025, 11:40 | 13.6 | 13.6 °C |
| 9 Oct 2025, 08:58 | 11.4 | 11.4 °C |
| 11 Sep 2025, 11:36 | 15.3 | 15.3 °C |
| 8 Aug 2025, 11:13 | 16.9 | 16.9 °C |
| 23 Jul 2025, 12:00 | 17.4 | 17.4 °C |
| 25 Jun 2025, 09:01 | 16.3 | 16.3 °C |
| 30 May 2025, 12:41 | 17 | 17 °C |
| 8 Apr 2025, 11:00 | 10.7 | 10.7 °C |
pH
code 0061
7.85
Sampled 22 Sep 2026, 34 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 22 Sep 2026, 12:19 | 7.85 | 7.85 |
| 11 Aug 2026, 10:45 | 7.76 | 7.76 |
| 13 Jul 2026, 10:56 | 8.05 | 8.05 |
| 26 Jun 2026, 10:43 | 7.86 | 7.86 |
| 13 May 2026, 11:55 | 8.36 | 8.36 |
| 22 Apr 2026, 11:04 | 8.14 | 8.14 |
| 24 Mar 2026, 09:27 | 8.21 | 8.21 |
| 13 Feb 2026, 08:48 | 8.11 | 8.11 |
| 16 Jan 2026, 10:42 | 7.97 | 7.97 |
| 10 Dec 2025, 11:05 | 8.01 | 8.01 |
| 5 Nov 2025, 11:40 | 7.87 | 7.87 |
| 9 Oct 2025, 08:58 | 8.06 | 8.06 |
| 11 Sep 2025, 11:36 | 7.87 | 7.87 |
| 8 Aug 2025, 11:13 | 8.01 | 8.01 |
| 23 Jul 2025, 12:00 | 7.83 | 7.83 |
| 25 Jun 2025, 09:01 | 8.12 | 8.12 |
| 30 May 2025, 12:41 | 8.03 | 8.03 |
| 8 Apr 2025, 11:00 | 8.14 | 8.14 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.22 mg/l
Sampled 11 Aug 2026, 2 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Aug 2026, 10:45 | 0.22 | 0.22 mg/l |
| 13 Jul 2026, 10:56 | <0.03 | below 0.03 mg/l (not detected above this) |
| 26 Jun 2026, 10:43 | 0.16 | 0.16 mg/l |
| 13 May 2026, 11:55 | 0.039 | 0.039 mg/l |
| 22 Apr 2026, 11:04 | 0.082 | 0.082 mg/l |
| 24 Mar 2026, 09:27 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Feb 2026, 08:48 | 0.08 | 0.08 mg/l |
| 16 Jan 2026, 10:42 | 0.095 | 0.095 mg/l |
| 10 Dec 2025, 11:05 | 0.1 | 0.1 mg/l |
| 5 Nov 2025, 11:40 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Oct 2025, 08:58 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Sep 2025, 11:36 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Aug 2025, 11:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 23 Jul 2025, 12:00 | <0.03 | below 0.03 mg/l (not detected above this) |
| 25 Jun 2025, 09:01 | <0.03 | below 0.03 mg/l (not detected above this) |
| 30 May 2025, 12:41 | <0.03 | below 0.03 mg/l (not detected above this) |
| 8 Apr 2025, 11:00 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
6.35 mg/l
Sampled 11 Aug 2026, 2 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Aug 2026, 10:45 | 6.35 | 6.35 mg/l |
| 13 Jul 2026, 10:56 | 7.99 | 7.99 mg/l |
| 26 Jun 2026, 10:43 | 8.11 | 8.11 mg/l |
| 13 May 2026, 11:55 | 7.08 | 7.08 mg/l |
| 22 Apr 2026, 11:04 | 6.43 | 6.43 mg/l |
| 24 Mar 2026, 09:27 | 3.89 | 3.89 mg/l |
| 13 Feb 2026, 08:48 | 3.28 | 3.28 mg/l |
| 16 Jan 2026, 10:42 | 6.76 | 6.76 mg/l |
| 10 Dec 2025, 11:05 | 8.26 | 8.26 mg/l |
| 5 Nov 2025, 11:40 | 5.28 | 5.28 mg/l |
| 9 Oct 2025, 08:58 | 6.79 | 6.79 mg/l |
| 11 Sep 2025, 11:36 | 6.19 | 6.19 mg/l |
| 8 Aug 2025, 11:13 | 7.49 | 7.49 mg/l |
| 23 Jul 2025, 12:00 | 5.68 | 5.68 mg/l |
| 25 Jun 2025, 09:01 | 11 | 11 mg/l |
| 30 May 2025, 12:41 | 6.68 | 6.68 mg/l |
| 8 Apr 2025, 11:00 | 6.26 | 6.26 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.12 mg/l
Sampled 11 Aug 2026, 2 months ago · 17 results banked
Every result (17)
| Sampled | Result as published | Reads as |
|---|---|---|
| 11 Aug 2026, 10:45 | 0.12 | 0.12 mg/l |
| 13 Jul 2026, 10:56 | 0.13 | 0.13 mg/l |
| 26 Jun 2026, 10:43 | 0.13 | 0.13 mg/l |
| 13 May 2026, 11:55 | 0.081 | 0.081 mg/l |
| 22 Apr 2026, 11:04 | 0.047 | 0.047 mg/l |
| 24 Mar 2026, 09:27 | 0.033 | 0.033 mg/l |
| 13 Feb 2026, 08:48 | 0.087 | 0.087 mg/l |
| 16 Jan 2026, 10:42 | 0.09 | 0.09 mg/l |
| 10 Dec 2025, 11:05 | 0.11 | 0.11 mg/l |
| 5 Nov 2025, 11:40 | 0.11 | 0.11 mg/l |
| 9 Oct 2025, 08:58 | 0.094 | 0.094 mg/l |
| 11 Sep 2025, 11:36 | 0.13 | 0.13 mg/l |
| 8 Aug 2025, 11:13 | 0.32 | 0.32 mg/l |
| 23 Jul 2025, 12:00 | 0.29 | 0.29 mg/l |
| 25 Jun 2025, 09:01 | 0.17 | 0.17 mg/l |
| 30 May 2025, 12:41 | 0.13 | 0.13 mg/l |
| 8 Apr 2025, 11:00 | 0.032 | 0.032 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
768 µS/cm
Sampled 22 Sep 2026, 34 days ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 22 Sep 2026, 12:19 | 768 | 768 µS/cm |
| 11 Aug 2026, 10:45 | 726 | 726 µS/cm |
| 13 Jul 2026, 10:56 | 770 | 770 µS/cm |
| 26 Jun 2026, 10:43 | 756 | 756 µS/cm |
| 13 May 2026, 11:55 | 718 | 718 µS/cm |
| 22 Apr 2026, 11:04 | 673 | 673 µS/cm |
| 24 Mar 2026, 09:27 | 598 | 598 µS/cm |
| 13 Feb 2026, 08:48 | 452 | 452 µS/cm |
| 16 Jan 2026, 10:42 | 632 | 632 µS/cm |
| 10 Dec 2025, 11:05 | 646 | 646 µS/cm |
| 5 Nov 2025, 11:40 | 671 | 671 µS/cm |
| 9 Oct 2025, 08:58 | 762 | 762 µS/cm |
| 11 Sep 2025, 11:36 | 675 | 675 µS/cm |
| 8 Aug 2025, 11:13 | 751 | 751 µS/cm |
| 23 Jul 2025, 12:00 | 661 | 661 µS/cm |
| 25 Jun 2025, 09:01 | 677 | 677 µS/cm |
| 30 May 2025, 12:41 | 709 | 709 µS/cm |
| 8 Apr 2025, 11:00 | 682 | 682 µS/cm |
Everything measured here
12 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 12 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 18 | Apr 2025 – Sep 2026 | 72.8% 22 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 18 | Apr 2025 – Sep 2026 | 7.05 mg/l 22 Sep 2026 |
| Temperature of Water 0076 | River water | 18 | Apr 2025 – Sep 2026 | 16.8 °C 22 Sep 2026 |
| pH 0061 | River water | 18 | Apr 2025 – Sep 2026 | 7.85 22 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 17 | Apr 2025 – Aug 2026 | 0.22 mg/l 11 Aug 2026 |
| Nitrate as N 0117 | River water | 17 | Apr 2025 – Aug 2026 | 6.35 mg/l 11 Aug 2026 |
| Orthophosphate, reactive as P 0180 | River water | 17 | Apr 2025 – Aug 2026 | 0.12 mg/l 11 Aug 2026 |
| Conductivity at 25 C 0077 | River water | 18 | Apr 2025 – Sep 2026 | 768 µS/cm 22 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 17 | Apr 2025 – Aug 2026 | 200 mg/l 11 Aug 2026 |
| Ammonia un-ionised as N 0119 | River water | 17 | Apr 2025 – Aug 2026 | 0.00416 mg/l 11 Aug 2026 |
| Nitrite as N 0118 | River water | 17 | Apr 2025 – Aug 2026 | 0.052 mg/l 11 Aug 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 17 | Apr 2025 – Aug 2026 | 6.4 mg/l 11 Aug 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.