River Yeo Over Compton
EA name: R YEO OVER COMPTON (also listed as “OVERCOMPTON MILL”)
Environment Agency sampling point SW-E4003300 · 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
- 21 Sep 2026, 13:5517 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 12 since 3 Sep 2025 Imported periods: 1 Oct 2023 – 8 Oct 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Environmental monitoring statutory (EU directives) · results completed 23 Sep 2026
- Where
- National Grid 358032, 116683As 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, 2 m from the line.
- Next gauge downstream
- Ilchester On the River Yeo · 14 km along the river
- Nearest gauge upstream
- Pen Mill On the River Yeo · 1.1 km along the river
- Why it was sampled
- Environmental monitoring statutory (EU directives) (12 samples)
Results here were completed a median of 4 days after the sample was taken (2 to 9 days, 12 samples).
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
90.3%
Sampled 21 Sep 2026, 17 days ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 13:55 | 90.3 | 90.3% |
| 11 Aug 2026, 13:40 | 89 | 89% |
| 21 Jul 2026, 08:37 | 88.8 | 88.8% |
| 4 Jun 2026, 09:23 | 93 | 93% |
| 13 May 2026, 10:54 | 91.7 | 91.7% |
| 21 Apr 2026, 14:52 | 111.6 | 111.6% |
| 13 Apr 2026, 12:15 | 99.7 | 99.7% |
| 27 Feb 2026, 12:33 | 95.9 | 95.9% |
| 30 Jan 2026, 11:37 | 95.8 | 95.8% |
| 10 Dec 2025, 12:15 | 94.8 | 94.8% |
| 18 Nov 2025, 10:31 | 94.5 | 94.5% |
| 3 Sep 2025, 10:33 | 91 | 91% |
Dissolved oxygen
as O2 · code 9924 · mg/l
8.74 mg/l
Sampled 21 Sep 2026, 17 days ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 13:55 | 8.74 | 8.74 mg/l |
| 11 Aug 2026, 13:40 | 8.23 | 8.23 mg/l |
| 21 Jul 2026, 08:37 | 8.45 | 8.45 mg/l |
| 4 Jun 2026, 09:23 | 9.44 | 9.44 mg/l |
| 13 May 2026, 10:54 | 9.82 | 9.82 mg/l |
| 21 Apr 2026, 14:52 | 11.9 | 11.9 mg/l |
| 13 Apr 2026, 12:15 | 11 | 11 mg/l |
| 27 Feb 2026, 12:33 | 10.6 | 10.6 mg/l |
| 30 Jan 2026, 11:37 | 11.4 | 11.4 mg/l |
| 10 Dec 2025, 12:15 | 10.5 | 10.5 mg/l |
| 18 Nov 2025, 10:31 | 10.9 | 10.9 mg/l |
| 3 Sep 2025, 10:33 | 8.77 | 8.77 mg/l |
Water temperature
code 0076 · °C
16.8 °C
Sampled 21 Sep 2026, 17 days ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 13:55 | 16.8 | 16.8 °C |
| 11 Aug 2026, 13:40 | 19 | 19 °C |
| 21 Jul 2026, 08:37 | 17.6 | 17.6 °C |
| 4 Jun 2026, 09:23 | 14.6 | 14.6 °C |
| 13 May 2026, 10:54 | 12.2 | 12.2 °C |
| 21 Apr 2026, 14:52 | 12.4 | 12.4 °C |
| 13 Apr 2026, 12:15 | 11 | 11 °C |
| 27 Feb 2026, 12:33 | 10.7 | 10.7 °C |
| 30 Jan 2026, 11:37 | 7.9 | 7.9 °C |
| 10 Dec 2025, 12:15 | 10.7 | 10.7 °C |
| 18 Nov 2025, 10:31 | 8.9 | 8.9 °C |
| 3 Sep 2025, 10:33 | 17 | 17 °C |
pH
code 0061
7.84
Sampled 21 Sep 2026, 17 days ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 13:55 | 7.84 | 7.84 |
| 11 Aug 2026, 13:40 | 7.8 | 7.8 |
| 21 Jul 2026, 08:37 | 8.07 | 8.07 |
| 4 Jun 2026, 09:23 | 8.18 | 8.18 |
| 13 May 2026, 10:54 | 8.07 | 8.07 |
| 21 Apr 2026, 14:52 | 8.22 | 8.22 |
| 13 Apr 2026, 12:15 | 8.09 | 8.09 |
| 27 Feb 2026, 12:33 | 8.39 | 8.39 |
| 30 Jan 2026, 11:37 | 7.99 | 7.99 |
| 10 Dec 2025, 12:15 | 8.02 | 8.02 |
| 18 Nov 2025, 10:31 | 8.05 | 8.05 |
| 3 Sep 2025, 10:33 | 8.11 | 8.11 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 21 Sep 2026, 17 days ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 13:55 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Aug 2026, 13:40 | 0.035 | 0.035 mg/l |
| 21 Jul 2026, 08:37 | 0.12 | 0.12 mg/l |
| 4 Jun 2026, 09:23 | 0.11 | 0.11 mg/l |
| 13 May 2026, 10:54 | 0.12 | 0.12 mg/l |
| 21 Apr 2026, 14:52 | 0.031 | 0.031 mg/l |
| 13 Apr 2026, 12:15 | 0.036 | 0.036 mg/l |
| 27 Feb 2026, 12:33 | 0.085 | 0.085 mg/l |
| 30 Jan 2026, 11:37 | 0.073 | 0.073 mg/l |
| 10 Dec 2025, 12:15 | 0.041 | 0.041 mg/l |
| 18 Nov 2025, 10:31 | 0.041 | 0.041 mg/l |
| 3 Sep 2025, 10:33 | 0.072 | 0.072 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
9.99 mg/l
Sampled 21 Sep 2026, 17 days ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 13:55 | 9.99 | 9.99 mg/l |
| 11 Aug 2026, 13:40 | 9.98 | 9.98 mg/l |
| 21 Jul 2026, 08:37 | 4.07 | 4.07 mg/l |
| 4 Jun 2026, 09:23 | 3.65 | 3.65 mg/l |
| 13 May 2026, 10:54 | 7.97 | 7.97 mg/l |
| 21 Apr 2026, 14:52 | 8.48 | 8.48 mg/l |
| 13 Apr 2026, 12:15 | 8.18 | 8.18 mg/l |
| 27 Feb 2026, 12:33 | 2.98 | 2.98 mg/l |
| 30 Jan 2026, 11:37 | 2.79 | 2.79 mg/l |
| 10 Dec 2025, 12:15 | 4.78 | 4.78 mg/l |
| 18 Nov 2025, 10:31 | 6.58 | 6.58 mg/l |
| 3 Sep 2025, 10:33 | 5.48 | 5.48 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.15 mg/l
Sampled 21 Sep 2026, 17 days ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 13:55 | 0.15 | 0.15 mg/l |
| 11 Aug 2026, 13:40 | 0.16 | 0.16 mg/l |
| 21 Jul 2026, 08:37 | 0.2 | 0.2 mg/l |
| 4 Jun 2026, 09:23 | 0.16 | 0.16 mg/l |
| 13 May 2026, 10:54 | 0.12 | 0.12 mg/l |
| 21 Apr 2026, 14:52 | 0.083 | 0.083 mg/l |
| 13 Apr 2026, 12:15 | 0.08 | 0.08 mg/l |
| 27 Feb 2026, 12:33 | 0.093 | 0.093 mg/l |
| 30 Jan 2026, 11:37 | 0.11 | 0.11 mg/l |
| 10 Dec 2025, 12:15 | 0.11 | 0.11 mg/l |
| 18 Nov 2025, 10:31 | 0.088 | 0.088 mg/l |
| 3 Sep 2025, 10:33 | 0.14 | 0.14 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
750 µS/cm
Sampled 21 Sep 2026, 17 days ago · 12 results banked
Every result (12)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Sep 2026, 13:55 | 750 | 750 µS/cm |
| 11 Aug 2026, 13:40 | 744 | 744 µS/cm |
| 21 Jul 2026, 08:37 | 680 | 680 µS/cm |
| 4 Jun 2026, 09:23 | 599 | 599 µS/cm |
| 13 May 2026, 10:54 | 674 | 674 µS/cm |
| 21 Apr 2026, 14:52 | 665 | 665 µS/cm |
| 13 Apr 2026, 12:15 | 673 | 673 µS/cm |
| 27 Feb 2026, 12:33 | 496 | 496 µS/cm |
| 30 Jan 2026, 11:37 | 404 | 404 µS/cm |
| 10 Dec 2025, 12:15 | 478 | 478 µS/cm |
| 18 Nov 2025, 10:31 | 625 | 625 µS/cm |
| 3 Sep 2025, 10:33 | 808 | 808 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 | 12 | Sep 2025 – Sep 2026 | 90.3% 21 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 12 | Sep 2025 – Sep 2026 | 8.74 mg/l 21 Sep 2026 |
| Temperature of Water 0076 | River water | 12 | Sep 2025 – Sep 2026 | 16.8 °C 21 Sep 2026 |
| pH 0061 | River water | 12 | Sep 2025 – Sep 2026 | 7.84 21 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 12 | Sep 2025 – Sep 2026 | below 0.03 mg/l 21 Sep 2026 |
| Nitrate as N 0117 | River water | 12 | Sep 2025 – Sep 2026 | 9.99 mg/l 21 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 12 | Sep 2025 – Sep 2026 | 0.15 mg/l 21 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 12 | Sep 2025 – Sep 2026 | 750 µS/cm 21 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 12 | Sep 2025 – Sep 2026 | 190 mg/l 21 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 12 | Sep 2025 – Sep 2026 | below 0.00063 mg/l 21 Sep 2026 |
| Nitrite as N 0118 | River water | 12 | Sep 2025 – Sep 2026 | 0.012 mg/l 21 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 12 | Sep 2025 – Sep 2026 | 10 mg/l 21 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.