Little Ouse River downstream of Thetford sewage treatment works O/F
EA name: LT.OUSE R. D/S THETFORD STW O/F
Environment Agency sampling point AN-45M02A · 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
- 14 Jul 2026, 10:103 months ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 29 since 16 Oct 2023 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 585102, 283726As published, to the nearest 1 m. Open in a map
- River, by its own name
- Lt Ouse
- River, by the map
- Not placedIts name gives Lt Ouse; the only line close by, 3 m away, is Little Ouse River and is not traced into it. The river map cannot say which watercourse this is.
- Next gauge downstream
- Not known
- Why it was sampled
- Monitoring (national agency policy) (27 samples)
Environmental monitoring statutory (EU directives) (2 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
90.2%
Sampled 15 Jan 2026, 9 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Jan 2026, 10:12 | 90.2 | 90.2% |
| 15 Dec 2025, 12:33 | 92.9 | 92.9% |
| 4 Dec 2025, 13:56 | 86.1 | 86.1% |
| 20 Nov 2025, 10:10 | 84.2 | 84.2% |
| 7 Nov 2025, 14:06 | 74.1 | 74.1% |
| 28 Oct 2025, 09:23 | 85.3 | 85.3% |
| 11 Jul 2025, 11:48 | 84.1 | 84.1% |
| 11 Mar 2025, 13:17 | 96.7 | 96.7% |
| 4 Feb 2025, 15:55 | 95.3 | 95.3% |
| 20 Jan 2025, 14:29 | 94.6 | 94.6% |
| 9 Dec 2024, 14:07 | 87.1 | 87.1% |
| 18 Nov 2024, 13:24 | 87.3 | 87.3% |
| 24 Oct 2024, 10:21 | 89.2 | 89.2% |
| 18 Sep 2024, 13:44 | 100.8 | 100.8% |
| 19 Aug 2024, 14:33 | 108.4 | 108.4% |
| 15 Jul 2024, 12:48 | 99.6 | 99.6% |
| 17 Jun 2024, 09:46 | 94.7 | 94.7% |
| 17 May 2024, 11:02 | 94.3 | 94.3% |
| 24 Apr 2024, 10:09 | 94.3 | 94.3% |
| 18 Mar 2024, 11:53 | 93.8 | 93.8% |
| 19 Feb 2024, 13:54 | 86.1 | 86.1% |
| 15 Jan 2024, 12:54 | 88.7 | 88.7% |
| 5 Dec 2023, 11:41 | 87.4 | 87.4% |
| 20 Nov 2023, 13:35 | 82.7 | 82.7% |
| 16 Oct 2023, 13:44 | 91.8 | 91.8% |
Dissolved oxygen
as O2 · code 9924 · mg/l
11.2 mg/l
Sampled 15 Jan 2026, 9 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Jan 2026, 10:12 | 11.2 | 11.2 mg/l |
| 15 Dec 2025, 12:33 | 11 | 11 mg/l |
| 4 Dec 2025, 13:56 | 10.3 | 10.3 mg/l |
| 20 Nov 2025, 10:10 | 10.5 | 10.5 mg/l |
| 7 Nov 2025, 14:06 | 7.81 | 7.81 mg/l |
| 28 Oct 2025, 09:23 | 9.59 | 9.59 mg/l |
| 11 Jul 2025, 11:48 | 7.44 | 7.44 mg/l |
| 11 Mar 2025, 13:17 | 11.2 | 11.2 mg/l |
| 4 Feb 2025, 15:55 | 11.9 | 11.9 mg/l |
| 20 Jan 2025, 14:29 | 11.8 | 11.8 mg/l |
| 9 Dec 2024, 14:07 | 10.5 | 10.5 mg/l |
| 18 Nov 2024, 13:24 | 10.3 | 10.3 mg/l |
| 24 Oct 2024, 10:21 | 9.77 | 9.77 mg/l |
| 18 Sep 2024, 13:44 | 9.99 | 9.99 mg/l |
| 19 Aug 2024, 14:33 | 10.3 | 10.3 mg/l |
| 15 Jul 2024, 12:48 | 9.81 | 9.81 mg/l |
| 17 Jun 2024, 09:46 | 9.67 | 9.67 mg/l |
| 17 May 2024, 11:02 | 9.48 | 9.48 mg/l |
| 24 Apr 2024, 10:09 | 10.7 | 10.7 mg/l |
| 18 Mar 2024, 11:53 | 10.3 | 10.3 mg/l |
| 19 Feb 2024, 13:54 | 9.65 | 9.65 mg/l |
| 15 Jan 2024, 12:54 | 11.6 | 11.6 mg/l |
| 5 Dec 2023, 11:41 | 10.9 | 10.9 mg/l |
| 20 Nov 2023, 13:35 | 9.36 | 9.36 mg/l |
| 16 Oct 2023, 13:44 | 10.2 | 10.2 mg/l |
Water temperature
code 0076 · °C
5.9 °C
Sampled 15 Jan 2026, 9 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Jan 2026, 10:12 | 5.9 | 5.9 °C |
| 15 Dec 2025, 12:33 | 7.9 | 7.9 °C |
| 4 Dec 2025, 13:56 | 7.5 | 7.5 °C |
| 20 Nov 2025, 10:10 | 5.9 | 5.9 °C |
| 7 Nov 2025, 14:06 | 12.9 | 12.9 °C |
| 28 Oct 2025, 09:23 | 10.1 | 10.1 °C |
| 11 Jul 2025, 11:48 | 21.3 | 21.3 °C |
| 11 Mar 2025, 13:17 | 8.9 | 8.9 °C |
| 4 Feb 2025, 15:55 | 5.9 | 5.9 °C |
| 20 Jan 2025, 14:29 | 6 | 6 °C |
| 9 Dec 2024, 14:07 | 7.3 | 7.3 °C |
| 18 Nov 2024, 13:24 | 8.2 | 8.2 °C |
| 24 Oct 2024, 10:21 | 11.2 | 11.2 °C |
| 18 Sep 2024, 13:44 | 15.7 | 15.7 °C |
| 19 Aug 2024, 14:33 | 17.6 | 17.6 °C |
| 15 Jul 2024, 12:48 | 16 | 16 °C |
| 17 Jun 2024, 09:46 | 14.3 | 14.3 °C |
| 17 May 2024, 11:02 | 15 | 15 °C |
| 24 Apr 2024, 10:09 | 9.6 | 9.6 °C |
| 18 Mar 2024, 11:53 | 11 | 11 °C |
| 19 Feb 2024, 13:54 | 10.2 | 10.2 °C |
| 15 Jan 2024, 12:54 | 4 | 4 °C |
| 5 Dec 2023, 11:41 | 5.7 | 5.7 °C |
| 20 Nov 2023, 13:35 | 9.8 | 9.8 °C |
| 16 Oct 2023, 13:44 | 10.4 | 10.4 °C |
pH
code 0061
7.66
Sampled 14 Jul 2026, 3 months ago · 29 results banked
Every result (29)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Jul 2026, 10:10 | 7.66 | 7.66 |
| 27 Apr 2026, 11:28 | 7.88 | 7.88 |
| 15 Jan 2026, 10:12 | 7.9 | 7.9 |
| 15 Dec 2025, 12:33 | 7.73 | 7.73 |
| 4 Dec 2025, 13:56 | 7.81 | 7.81 |
| 20 Nov 2025, 10:10 | 7.82 | 7.82 |
| 7 Nov 2025, 14:06 | 7.72 | 7.72 |
| 28 Oct 2025, 09:23 | 7.81 | 7.81 |
| 11 Jul 2025, 11:48 | 7.7 | 7.7 |
| 1 Apr 2025, 13:05 | 8.06 | 8.06 |
| 11 Mar 2025, 13:17 | 8.04 | 8.04 |
| 4 Feb 2025, 15:55 | 7.88 | 7.88 |
| 20 Jan 2025, 14:29 | 7.84 | 7.84 |
| 9 Dec 2024, 14:07 | 7.96 | 7.96 |
| 18 Nov 2024, 13:24 | 7.83 | 7.83 |
| 24 Oct 2024, 10:21 | 7.87 | 7.87 |
| 18 Sep 2024, 13:44 | 7.91 | 7.91 |
| 19 Aug 2024, 14:33 | 7.98 | 7.98 |
| 15 Jul 2024, 12:48 | 7.97 | 7.97 |
| 17 Jun 2024, 09:46 | 7.76 | 7.76 |
| 17 May 2024, 11:02 | 7.64 | 7.64 |
| 24 Apr 2024, 10:09 | 7.89 | 7.89 |
| 4 Apr 2024, 11:29 | 7.84 | 7.84 |
| 18 Mar 2024, 11:53 | 7.86 | 7.86 |
| 19 Feb 2024, 13:54 | 7.88 | 7.88 |
| 15 Jan 2024, 12:54 | 7.82 | 7.82 |
| 5 Dec 2023, 11:41 | 7.78 | 7.78 |
| 20 Nov 2023, 13:35 | 7.73 | 7.73 |
| 16 Oct 2023, 13:44 | 7.96 | 7.96 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.13 mg/l
Sampled 15 Dec 2025, 10 months ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Dec 2025, 12:33 | 0.13 | 0.13 mg/l |
| 4 Dec 2025, 13:56 | 0.21 | 0.21 mg/l |
| 20 Nov 2025, 10:10 | 0.28 | 0.28 mg/l |
| 7 Nov 2025, 14:06 | 0.4 | 0.4 mg/l |
| 11 Mar 2025, 13:17 | 0.064 | 0.064 mg/l |
| 4 Feb 2025, 15:55 | 0.11 | 0.11 mg/l |
| 20 Jan 2025, 14:29 | 0.14 | 0.14 mg/l |
| 9 Dec 2024, 14:07 | 0.13 | 0.13 mg/l |
| 18 Nov 2024, 13:24 | 0.22 | 0.22 mg/l |
| 24 Oct 2024, 10:21 | 0.084 | 0.084 mg/l |
| 18 Sep 2024, 13:44 | 0.064 | 0.064 mg/l |
| 19 Aug 2024, 14:33 | 0.14 | 0.14 mg/l |
| 15 Jul 2024, 12:48 | 0.095 | 0.095 mg/l |
| 17 Jun 2024, 09:46 | 0.086 | 0.086 mg/l |
| 17 May 2024, 11:02 | 0.18 | 0.18 mg/l |
| 24 Apr 2024, 10:09 | 0.091 | 0.091 mg/l |
| 18 Mar 2024, 11:53 | 0.1 | 0.1 mg/l |
| 19 Feb 2024, 13:54 | 0.049 | 0.049 mg/l |
| 15 Jan 2024, 12:54 | 0.1 | 0.1 mg/l |
| 5 Dec 2023, 11:41 | 0.082 | 0.082 mg/l |
| 20 Nov 2023, 13:35 | 0.088 | 0.088 mg/l |
| 16 Oct 2023, 13:44 | 0.23 | 0.23 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
10.9 mg/l
Sampled 15 Dec 2025, 10 months ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Dec 2025, 12:33 | 10.9 | 10.9 mg/l |
| 4 Dec 2025, 13:56 | 9.95 | 9.95 mg/l |
| 20 Nov 2025, 10:10 | 9.15 | 9.15 mg/l |
| 7 Nov 2025, 14:06 | 10.9 | 10.9 mg/l |
| 11 Mar 2025, 13:17 | 9.87 | 9.87 mg/l |
| 4 Feb 2025, 15:55 | 9.94 | 9.94 mg/l |
| 20 Jan 2025, 14:29 | 9.83 | 9.83 mg/l |
| 9 Dec 2024, 14:07 | 8.65 | 8.65 mg/l |
| 18 Nov 2024, 13:24 | 9.86 | 9.86 mg/l |
| 24 Oct 2024, 10:21 | 8.27 | 8.27 mg/l |
| 18 Sep 2024, 13:44 | 9.87 | 9.87 mg/l |
| 19 Aug 2024, 14:33 | 9.76 | 9.76 mg/l |
| 15 Jul 2024, 12:48 | 7.46 | 7.46 mg/l |
| 17 Jun 2024, 09:46 | 8.26 | 8.26 mg/l |
| 17 May 2024, 11:02 | 8.05 | 8.05 mg/l |
| 24 Apr 2024, 10:09 | 8.97 | 8.97 mg/l |
| 18 Mar 2024, 11:53 | 8.06 | 8.06 mg/l |
| 19 Feb 2024, 13:54 | 6.17 | 6.17 mg/l |
| 15 Jan 2024, 12:54 | 8.45 | 8.45 mg/l |
| 5 Dec 2023, 11:41 | 8.56 | 8.56 mg/l |
| 20 Nov 2023, 13:35 | 7.25 | 7.25 mg/l |
| 16 Oct 2023, 13:44 | 7.06 | 7.06 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.11 mg/l
Sampled 15 Dec 2025, 10 months ago · 22 results banked
Every result (22)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Dec 2025, 12:33 | 0.11 | 0.11 mg/l |
| 4 Dec 2025, 13:56 | 0.11 | 0.11 mg/l |
| 20 Nov 2025, 10:10 | 0.22 | 0.22 mg/l |
| 7 Nov 2025, 14:06 | 0.16 | 0.16 mg/l |
| 11 Mar 2025, 13:17 | 0.044 | 0.044 mg/l |
| 4 Feb 2025, 15:55 | 0.072 | 0.072 mg/l |
| 20 Jan 2025, 14:29 | 0.082 | 0.082 mg/l |
| 9 Dec 2024, 14:07 | 0.13 | 0.13 mg/l |
| 18 Nov 2024, 13:24 | 0.1 | 0.1 mg/l |
| 24 Oct 2024, 10:21 | 0.079 | 0.079 mg/l |
| 18 Sep 2024, 13:44 | 0.096 | 0.096 mg/l |
| 19 Aug 2024, 14:33 | 0.11 | 0.11 mg/l |
| 15 Jul 2024, 12:48 | 0.076 | 0.076 mg/l |
| 17 Jun 2024, 09:46 | 0.066 | 0.066 mg/l |
| 17 May 2024, 11:02 | 0.095 | 0.095 mg/l |
| 24 Apr 2024, 10:09 | 0.057 | 0.057 mg/l |
| 18 Mar 2024, 11:53 | 0.063 | 0.063 mg/l |
| 19 Feb 2024, 13:54 | 0.072 | 0.072 mg/l |
| 15 Jan 2024, 12:54 | 0.092 | 0.092 mg/l |
| 5 Dec 2023, 11:41 | 0.079 | 0.079 mg/l |
| 20 Nov 2023, 13:35 | 0.091 | 0.091 mg/l |
| 16 Oct 2023, 13:44 | 0.16 | 0.16 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
885 µS/cm
Sampled 15 Jan 2026, 9 months ago · 25 results banked
Every result (25)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Jan 2026, 10:12 | 885 | 885 µS/cm |
| 15 Dec 2025, 12:33 | 925 | 925 µS/cm |
| 4 Dec 2025, 13:56 | 1014 | 1014 µS/cm |
| 20 Nov 2025, 10:10 | 923 | 923 µS/cm |
| 7 Nov 2025, 14:06 | 1043 | 1043 µS/cm |
| 28 Oct 2025, 09:23 | 906 | 906 µS/cm |
| 11 Jul 2025, 11:48 | 946 | 946 µS/cm |
| 11 Mar 2025, 13:17 | 816 | 816 µS/cm |
| 4 Feb 2025, 15:55 | 869 | 869 µS/cm |
| 20 Jan 2025, 14:29 | 879 | 879 µS/cm |
| 9 Dec 2024, 14:07 | 727 | 727 µS/cm |
| 18 Nov 2024, 13:24 | 916 | 916 µS/cm |
| 24 Oct 2024, 10:21 | 876 | 876 µS/cm |
| 18 Sep 2024, 13:44 | 885 | 885 µS/cm |
| 19 Aug 2024, 14:33 | 895 | 895 µS/cm |
| 15 Jul 2024, 12:48 | 861 | 861 µS/cm |
| 17 Jun 2024, 09:46 | 838 | 838 µS/cm |
| 17 May 2024, 11:02 | 867 | 867 µS/cm |
| 24 Apr 2024, 10:09 | 836 | 836 µS/cm |
| 18 Mar 2024, 11:53 | 832 | 832 µS/cm |
| 19 Feb 2024, 13:54 | 699 | 699 µS/cm |
| 15 Jan 2024, 12:54 | 847 | 847 µS/cm |
| 5 Dec 2023, 11:41 | 898 | 898 µS/cm |
| 20 Nov 2023, 13:35 | 845 | 845 µS/cm |
| 16 Oct 2023, 13:44 | 886 | 886 µS/cm |
Everything measured here
17 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 17 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 25 | Oct 2023 – Jan 2026 | 90.2% 15 Jan 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 25 | Oct 2023 – Jan 2026 | 11.2 mg/l 15 Jan 2026 |
| Temperature of Water 0076 | River water | 25 | Oct 2023 – Jan 2026 | 5.9 °C 15 Jan 2026 |
| pH 0061 | River water | 29 | Oct 2023 – Jul 2026 | 7.66 14 Jul 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 22 | Oct 2023 – Dec 2025 | 0.13 mg/l 15 Dec 2025 |
| Nitrate as N 0117 | River water | 22 | Oct 2023 – Dec 2025 | 10.9 mg/l 15 Dec 2025 |
| Orthophosphate, reactive as P 0180 | River water | 22 | Oct 2023 – Dec 2025 | 0.11 mg/l 15 Dec 2025 |
| Conductivity at 25 C 0077 | River water | 25 | Oct 2023 – Jan 2026 | 885 µS/cm 15 Jan 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 22 | Oct 2023 – Dec 2025 | 240 mg/l 15 Dec 2025 |
| Ammonia un-ionised as N 0119 | River water | 22 | Oct 2023 – Dec 2025 | 0.0011 mg/l 15 Dec 2025 |
| BOD : 5 Day ATU 0085 | River water | 18 | Feb 2024 – Dec 2025 | 1.4 mg/l 15 Dec 2025 |
| Calcium, Dissolved 0239 | River water | 12 | Oct 2023 – Jul 2026 | 120 mg/l 14 Jul 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 12 | Oct 2023 – Jul 2026 | 4.2 mg/l 14 Jul 2026 |
| Iron, Dissolved 6460 | River water | 12 | Oct 2023 – Jul 2026 | 37 µg/l 14 Jul 2026 |
| Magnesium, Dissolved 0235 | River water | 12 | Oct 2023 – Jul 2026 | 3.8 mg/l 14 Jul 2026 |
| Nitrite as N 0118 | River water | 22 | Oct 2023 – Dec 2025 | 0.057 mg/l 15 Dec 2025 |
| Nitrogen, Total Oxidised as N 0116 | River water | 22 | Oct 2023 – Dec 2025 | 11 mg/l 15 Dec 2025 |
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.