Great Eau (upstream of South Thoresby)
EA name: GREAT EAU (UPSTREAM OF SOUTH THORESBY) (also listed as “GREAT EAU (UPSTREAM OF SOUTH THORESBY) - GB105029061620”)
Environment Agency sampling point AN-GEAU7 · 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
- 8 Sep 2026, 10:0623 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 23 since 6 Jun 2024 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Environmental monitoring statutory (EU directives)
- Where
- National Grid 538756, 375691As published, to the nearest 1 m. Open in a map
- River, by its own name
- Great Eau
- River, by the map
- Calceby BeckOn a small stream traced into the river its name gives, 1 m from the line.
- Next gauge downstream
- None tracedIts water reaches the sea without passing a gauge.
- Why it was sampled
- Environmental monitoring statutory (EU directives) (23 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
89.7%
Sampled 8 Sep 2026, 23 days ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 8 Sep 2026, 10:06 | 89.7 | 89.7% |
| 14 Aug 2026, 12:28 | 86.3 | 86.3% |
| 15 Jul 2026, 11:14 | 92.6 | 92.6% |
| 15 Jun 2026, 09:36 | 96.7 | 96.7% |
| 20 May 2026, 10:13 | 96.1 | 96.1% |
| 27 Apr 2026, 11:01 | 98 | 98% |
| 11 Mar 2026, 08:30 | 95.7 | 95.7% |
| 9 Feb 2026, 08:18 | 94.6 | 94.6% |
| 13 Jan 2026, 09:07 | 95.3 | 95.3% |
| 4 Dec 2025, 08:02 | 91.5 | 91.5% |
| 10 Nov 2025, 12:34 | 81.6 | 81.6% |
| 17 Oct 2025, 07:35 | 88.1 | 88.1% |
| 7 Apr 2025, 10:14 | 102 | 102% |
| 12 Mar 2025, 08:16 | 95.8 | 95.8% |
| 12 Feb 2025, 09:21 | 97.3 | 97.3% |
| 3 Jan 2025, 09:20 | 97.2 | 97.2% |
| 5 Dec 2024, 11:15 | 92.1 | 92.1% |
| 5 Nov 2024, 10:54 | 92.4 | 92.4% |
| 16 Oct 2024, 13:08 | 92.8 | 92.8% |
| 5 Sep 2024, 08:32 | 91.6 | 91.6% |
| 15 Aug 2024, 10:36 | 93.7 | 93.7% |
| 3 Jul 2024, 08:47 | 91.6 | 91.6% |
| 6 Jun 2024, 08:07 | 95.7 | 95.7% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.14 mg/l
Sampled 8 Sep 2026, 23 days ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 8 Sep 2026, 10:06 | 9.14 | 9.14 mg/l |
| 14 Aug 2026, 12:28 | 8.13 | 8.13 mg/l |
| 15 Jul 2026, 11:14 | 9.23 | 9.23 mg/l |
| 15 Jun 2026, 09:36 | 10.4 | 10.4 mg/l |
| 20 May 2026, 10:13 | 10.3 | 10.3 mg/l |
| 27 Apr 2026, 11:01 | 10.7 | 10.7 mg/l |
| 11 Mar 2026, 08:30 | 11.2 | 11.2 mg/l |
| 9 Feb 2026, 08:18 | 11.4 | 11.4 mg/l |
| 13 Jan 2026, 09:07 | 11.7 | 11.7 mg/l |
| 4 Dec 2025, 08:02 | 10.9 | 10.9 mg/l |
| 10 Nov 2025, 12:34 | 8.9 | 8.9 mg/l |
| 17 Oct 2025, 07:35 | 9.72 | 9.72 mg/l |
| 7 Apr 2025, 10:14 | 12.4 | 12.4 mg/l |
| 12 Mar 2025, 08:16 | 12 | 12 mg/l |
| 12 Feb 2025, 09:21 | 12 | 12 mg/l |
| 3 Jan 2025, 09:20 | 12.8 | 12.8 mg/l |
| 5 Dec 2024, 11:15 | 10.5 | 10.5 mg/l |
| 5 Nov 2024, 10:54 | 10.2 | 10.2 mg/l |
| 16 Oct 2024, 13:08 | 9.84 | 9.84 mg/l |
| 5 Sep 2024, 08:32 | 9.4 | 9.4 mg/l |
| 15 Aug 2024, 10:36 | 9.4 | 9.4 mg/l |
| 3 Jul 2024, 08:47 | 9.69 | 9.69 mg/l |
| 6 Jun 2024, 08:07 | 10.5 | 10.5 mg/l |
Water temperature
code 0076 · °C
14.4 °C
Sampled 8 Sep 2026, 23 days ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 8 Sep 2026, 10:06 | 14.4 | 14.4 °C |
| 14 Aug 2026, 12:28 | 18.1 | 18.1 °C |
| 15 Jul 2026, 11:14 | 15.4 | 15.4 °C |
| 15 Jun 2026, 09:36 | 11.9 | 11.9 °C |
| 20 May 2026, 10:13 | 12 | 12 °C |
| 27 Apr 2026, 11:01 | 11.4 | 11.4 °C |
| 11 Mar 2026, 08:30 | 8.5 | 8.5 °C |
| 9 Feb 2026, 08:18 | 7.3 | 7.3 °C |
| 13 Jan 2026, 09:07 | 6.5 | 6.5 °C |
| 4 Dec 2025, 08:02 | 7.6 | 7.6 °C |
| 10 Nov 2025, 12:34 | 11.4 | 11.4 °C |
| 17 Oct 2025, 07:35 | 10.9 | 10.9 °C |
| 7 Apr 2025, 10:14 | 6.9 | 6.9 °C |
| 12 Mar 2025, 08:16 | 5.6 | 5.6 °C |
| 12 Feb 2025, 09:21 | 6.2 | 6.2 °C |
| 3 Jan 2025, 09:20 | 3.9 | 3.9 °C |
| 5 Dec 2024, 11:15 | 9.6 | 9.6 °C |
| 5 Nov 2024, 10:54 | 10.8 | 10.8 °C |
| 16 Oct 2024, 13:08 | 12.6 | 12.6 °C |
| 5 Sep 2024, 08:32 | 14.1 | 14.1 °C |
| 15 Aug 2024, 10:36 | 15.1 | 15.1 °C |
| 3 Jul 2024, 08:47 | 12.7 | 12.7 °C |
| 6 Jun 2024, 08:07 | 11.1 | 11.1 °C |
pH
code 0061
8.08
Sampled 8 Sep 2026, 23 days ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 8 Sep 2026, 10:06 | 8.08 | 8.08 |
| 14 Aug 2026, 12:28 | 7.94 | 7.94 |
| 15 Jul 2026, 11:14 | 8.13 | 8.13 |
| 15 Jun 2026, 09:36 | 8.32 | 8.32 |
| 20 May 2026, 10:13 | 8.21 | 8.21 |
| 27 Apr 2026, 11:01 | 8.32 | 8.32 |
| 11 Mar 2026, 08:30 | 8.12 | 8.12 |
| 9 Feb 2026, 08:18 | 7.99 | 7.99 |
| 13 Jan 2026, 09:07 | 8.2 | 8.2 |
| 4 Dec 2025, 08:02 | 8.03 | 8.03 |
| 10 Nov 2025, 12:34 | 7.84 | 7.84 |
| 17 Oct 2025, 07:35 | 8.08 | 8.08 |
| 7 Apr 2025, 10:14 | 8.26 | 8.26 |
| 12 Mar 2025, 08:16 | 8.38 | 8.38 |
| 12 Feb 2025, 09:21 | 8.19 | 8.19 |
| 3 Jan 2025, 09:20 | 8.27 | 8.27 |
| 5 Dec 2024, 11:15 | 8.05 | 8.05 |
| 5 Nov 2024, 10:54 | 8.16 | 8.16 |
| 16 Oct 2024, 13:08 | 8.32 | 8.32 |
| 5 Sep 2024, 08:32 | 8.11 | 8.11 |
| 15 Aug 2024, 10:36 | 8.22 | 8.22 |
| 3 Jul 2024, 08:47 | 8.12 | 8.12 |
| 6 Jun 2024, 08:07 | 8.21 | 8.21 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 8 Sep 2026, 23 days ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 8 Sep 2026, 10:06 | <0.03 | below 0.03 mg/l (not detected above this) |
| 14 Aug 2026, 12:28 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Jul 2026, 11:14 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Jun 2026, 09:36 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 May 2026, 10:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 27 Apr 2026, 11:01 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Mar 2026, 08:30 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Feb 2026, 08:18 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Jan 2026, 09:07 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Dec 2025, 08:02 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Nov 2025, 12:34 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Oct 2025, 07:35 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Mar 2025, 08:16 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Feb 2025, 09:21 | 0.041 | 0.041 mg/l |
| 3 Jan 2025, 09:20 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Dec 2024, 11:15 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Nov 2024, 10:54 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Oct 2024, 13:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Sep 2024, 08:32 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Aug 2024, 10:36 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Jul 2024, 08:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Jun 2024, 08:07 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
8.49 mg/l
Sampled 8 Sep 2026, 23 days ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 8 Sep 2026, 10:06 | 8.49 | 8.49 mg/l |
| 14 Aug 2026, 12:28 | 9.39 | 9.39 mg/l |
| 15 Jul 2026, 11:14 | 9.49 | 9.49 mg/l |
| 15 Jun 2026, 09:36 | 9.28 | 9.28 mg/l |
| 20 May 2026, 10:13 | 8.98 | 8.98 mg/l |
| 27 Apr 2026, 11:01 | 9.78 | 9.78 mg/l |
| 11 Mar 2026, 08:30 | 9.78 | 9.78 mg/l |
| 9 Feb 2026, 08:18 | 9.59 | 9.59 mg/l |
| 13 Jan 2026, 09:07 | 9.39 | 9.39 mg/l |
| 4 Dec 2025, 08:02 | 9.28 | 9.28 mg/l |
| 10 Nov 2025, 12:34 | 7.29 | 7.29 mg/l |
| 17 Oct 2025, 07:35 | 9.19 | 9.19 mg/l |
| 12 Mar 2025, 08:16 | 9.88 | 9.88 mg/l |
| 12 Feb 2025, 09:21 | 9.67 | 9.67 mg/l |
| 3 Jan 2025, 09:20 | 9.98 | 9.98 mg/l |
| 5 Nov 2024, 10:54 | 9.98 | 9.98 mg/l |
| 16 Oct 2024, 13:08 | 8.88 | 8.88 mg/l |
| 5 Sep 2024, 08:32 | 9.48 | 9.48 mg/l |
| 15 Aug 2024, 10:36 | 11 | 11 mg/l |
| 3 Jul 2024, 08:47 | 9.38 | 9.38 mg/l |
| 6 Jun 2024, 08:07 | 9.67 | 9.67 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.03 mg/l
Sampled 8 Sep 2026, 23 days ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 8 Sep 2026, 10:06 | 0.03 | 0.03 mg/l |
| 14 Aug 2026, 12:28 | 0.032 | 0.032 mg/l |
| 15 Jul 2026, 11:14 | 0.043 | 0.043 mg/l |
| 15 Jun 2026, 09:36 | 0.023 | 0.023 mg/l |
| 20 May 2026, 10:13 | 0.015 | 0.015 mg/l |
| 27 Apr 2026, 11:01 | 0.013 | 0.013 mg/l |
| 11 Mar 2026, 08:30 | 0.017 | 0.017 mg/l |
| 9 Feb 2026, 08:18 | 0.015 | 0.015 mg/l |
| 13 Jan 2026, 09:07 | 0.013 | 0.013 mg/l |
| 4 Dec 2025, 08:02 | 0.021 | 0.021 mg/l |
| 10 Nov 2025, 12:34 | 0.025 | 0.025 mg/l |
| 17 Oct 2025, 07:35 | 0.018 | 0.018 mg/l |
| 12 Mar 2025, 08:16 | <0.01 | below 0.01 mg/l (not detected above this) |
| 12 Feb 2025, 09:21 | 0.012 | 0.012 mg/l |
| 3 Jan 2025, 09:20 | 0.01 | 0.01 mg/l |
| 5 Nov 2024, 10:54 | <0.01 | below 0.01 mg/l (not detected above this) |
| 16 Oct 2024, 13:08 | 0.013 | 0.013 mg/l |
| 5 Sep 2024, 08:32 | 0.019 | 0.019 mg/l |
| 15 Aug 2024, 10:36 | 0.018 | 0.018 mg/l |
| 3 Jul 2024, 08:47 | 0.018 | 0.018 mg/l |
| 6 Jun 2024, 08:07 | 0.016 | 0.016 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
608 µS/cm
Sampled 8 Sep 2026, 23 days ago · 23 results banked
Every result (23)
| Sampled | Result as published | Reads as |
|---|---|---|
| 8 Sep 2026, 10:06 | 608 | 608 µS/cm |
| 14 Aug 2026, 12:28 | 587 | 587 µS/cm |
| 15 Jul 2026, 11:14 | 610 | 610 µS/cm |
| 15 Jun 2026, 09:36 | 624 | 624 µS/cm |
| 20 May 2026, 10:13 | 609 | 609 µS/cm |
| 27 Apr 2026, 11:01 | 614 | 614 µS/cm |
| 11 Mar 2026, 08:30 | 631 | 631 µS/cm |
| 9 Feb 2026, 08:18 | 621 | 621 µS/cm |
| 13 Jan 2026, 09:07 | 632 | 632 µS/cm |
| 4 Dec 2025, 08:02 | 660 | 660 µS/cm |
| 10 Nov 2025, 12:34 | 649 | 649 µS/cm |
| 17 Oct 2025, 07:35 | 627 | 627 µS/cm |
| 7 Apr 2025, 10:14 | 668 | 668 µS/cm |
| 12 Mar 2025, 08:16 | 671 | 671 µS/cm |
| 12 Feb 2025, 09:21 | 663 | 663 µS/cm |
| 3 Jan 2025, 09:20 | 678 | 678 µS/cm |
| 5 Dec 2024, 11:15 | 664 | 664 µS/cm |
| 5 Nov 2024, 10:54 | 665 | 665 µS/cm |
| 16 Oct 2024, 13:08 | 664 | 664 µS/cm |
| 5 Sep 2024, 08:32 | 629 | 629 µS/cm |
| 15 Aug 2024, 10:36 | 626 | 626 µS/cm |
| 3 Jul 2024, 08:47 | 637 | 637 µS/cm |
| 6 Jun 2024, 08:07 | 671 | 671 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 | 23 | Jun 2024 – Sep 2026 | 89.7% 8 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 23 | Jun 2024 – Sep 2026 | 9.14 mg/l 8 Sep 2026 |
| Temperature of Water 0076 | River water | 23 | Jun 2024 – Sep 2026 | 14.4 °C 8 Sep 2026 |
| pH 0061 | River water | 23 | Jun 2024 – Sep 2026 | 8.08 8 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 22 | Jun 2024 – Sep 2026 | below 0.03 mg/l 8 Sep 2026 |
| Nitrate as N 0117 | River water | 21 | Jun 2024 – Sep 2026 | 8.49 mg/l 8 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 21 | Jun 2024 – Sep 2026 | 0.03 mg/l 8 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 23 | Jun 2024 – Sep 2026 | 608 µS/cm 8 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 22 | Jun 2024 – Sep 2026 | 220 mg/l 8 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 22 | Jun 2024 – Sep 2026 | below 0.00075 mg/l 8 Sep 2026 |
| Nitrite as N 0118 | River water | 22 | Jun 2024 – Sep 2026 | 0.0054 mg/l 8 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 21 | Jun 2024 – Sep 2026 | 8.5 mg/l 8 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.