Unnamed River upstream of Rowston sewage treatment works
EA name: UNNAMED RIVER U/S OF ROWSTON STW (also listed as “HEADWATERS OF UNNAMED RIVER U/S ROWSTON STW”)
Environment Agency sampling point AN-USRWSTN · 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
- 15 Apr 2026, 10:456 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
- 22 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 508354, 357000As published, to the nearest 1 m. Open in a map
- River, by its own name
- Unnamed
- River, by the map
- Not placedNo mapped watercourse within 500 m. The river map cannot say which watercourse this is.
- Next gauge downstream
- Not known
- Why it was sampled
- Monitoring (national agency policy) (22 samples)
4 visits found no water to sample (recorded as “No flow”).
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
95.4%
Sampled 15 Apr 2026, 6 months ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 10:45 | 95.4 | 95.4% |
| 16 Jan 2026, 11:14 | 88.4 | 88.4% |
| 7 Mar 2025, 09:10 | 99.1 | 99.1% |
| 13 Feb 2025, 10:01 | 98.4 | 98.4% |
| 28 Jan 2025, 08:58 | 91 | 91% |
| 5 Dec 2024, 10:56 | 89.1 | 89.1% |
| 18 Nov 2024, 10:19 | 83.6 | 83.6% |
| 18 Oct 2024, 09:09 | 56.3 | 56.3% |
| 15 Jul 2024, 10:23 | 85.7 | 85.7% |
| 18 Jun 2024, 10:11 | 81.1 | 81.1% |
| 13 May 2024, 10:32 | 81.1 | 81.1% |
| 15 Apr 2024, 10:29 | 91.2 | 91.2% |
| 18 Mar 2024, 12:07 | 107.4 | 107.4% |
| 19 Feb 2024, 14:05 | 94.4 | 94.4% |
| 15 Jan 2024, 10:03 | 89.6 | 89.6% |
| 5 Dec 2023, 10:02 | 88.9 | 88.9% |
| 20 Nov 2023, 09:17 | 87.4 | 87.4% |
| 16 Oct 2023, 09:04 | 84.5 | 84.5% |
Dissolved oxygen
as O2 · code 9924 · mg/l
10.3 mg/l
Sampled 15 Apr 2026, 6 months ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 10:45 | 10.3 | 10.3 mg/l |
| 16 Jan 2026, 11:14 | 11.2 | 11.2 mg/l |
| 7 Mar 2025, 09:10 | 11.8 | 11.8 mg/l |
| 13 Feb 2025, 10:01 | 12.8 | 12.8 mg/l |
| 28 Jan 2025, 08:58 | 11.4 | 11.4 mg/l |
| 5 Dec 2024, 10:56 | 10.3 | 10.3 mg/l |
| 18 Nov 2024, 10:19 | 10.6 | 10.6 mg/l |
| 18 Oct 2024, 09:09 | 6.4 | 6.4 mg/l |
| 15 Jul 2024, 10:23 | 8.93 | 8.93 mg/l |
| 18 Jun 2024, 10:11 | 8.64 | 8.64 mg/l |
| 13 May 2024, 10:32 | 8.25 | 8.25 mg/l |
| 15 Apr 2024, 10:29 | 10.7 | 10.7 mg/l |
| 18 Mar 2024, 12:07 | 11.9 | 11.9 mg/l |
| 19 Feb 2024, 14:05 | 11 | 11 mg/l |
| 15 Jan 2024, 10:03 | 12.4 | 12.4 mg/l |
| 5 Dec 2023, 10:02 | 11 | 11 mg/l |
| 20 Nov 2023, 09:17 | 10 | 10 mg/l |
| 16 Oct 2023, 09:04 | 9.61 | 9.61 mg/l |
Water temperature
code 0076 · °C
11.7 °C
Sampled 15 Apr 2026, 6 months ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 10:45 | 11.7 | 11.7 °C |
| 16 Jan 2026, 11:14 | 5.3 | 5.3 °C |
| 7 Mar 2025, 09:10 | 7.7 | 7.7 °C |
| 13 Feb 2025, 10:01 | 4.2 | 4.2 °C |
| 28 Jan 2025, 08:58 | 5.7 | 5.7 °C |
| 5 Dec 2024, 10:56 | 8.8 | 8.8 °C |
| 18 Nov 2024, 10:19 | 5.1 | 5.1 °C |
| 18 Oct 2024, 09:09 | 9.6 | 9.6 °C |
| 15 Jul 2024, 10:23 | 13.4 | 13.4 °C |
| 18 Jun 2024, 10:11 | 12.4 | 12.4 °C |
| 13 May 2024, 10:32 | 14.5 | 14.5 °C |
| 15 Apr 2024, 10:29 | 8.4 | 8.4 °C |
| 18 Mar 2024, 12:07 | 10.6 | 10.6 °C |
| 19 Feb 2024, 14:05 | 8.6 | 8.6 °C |
| 15 Jan 2024, 10:03 | 2 | 2 °C |
| 5 Dec 2023, 10:02 | 6.2 | 6.2 °C |
| 20 Nov 2023, 09:17 | 9.3 | 9.3 °C |
| 16 Oct 2023, 09:04 | 9.6 | 9.6 °C |
pH
code 0061
8.06
Sampled 15 Apr 2026, 6 months ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 10:45 | 8.06 | 8.06 |
| 16 Jan 2026, 11:14 | 7.88 | 7.88 |
| 7 Mar 2025, 09:10 | 8.2 | 8.2 |
| 13 Feb 2025, 10:01 | 8.11 | 8.11 |
| 28 Jan 2025, 08:58 | 7.86 | 7.86 |
| 5 Dec 2024, 10:56 | 7.94 | 7.94 |
| 18 Nov 2024, 10:19 | 7.98 | 7.98 |
| 18 Oct 2024, 09:09 | 7.62 | 7.62 |
| 15 Jul 2024, 10:23 | 8.06 | 8.06 |
| 18 Jun 2024, 10:11 | 8.04 | 8.04 |
| 13 May 2024, 10:32 | 7.98 | 7.98 |
| 15 Apr 2024, 10:29 | 8.08 | 8.08 |
| 18 Mar 2024, 12:07 | 8.04 | 8.04 |
| 19 Feb 2024, 14:05 | 7.94 | 7.94 |
| 15 Jan 2024, 10:03 | 8.25 | 8.25 |
| 5 Dec 2023, 10:02 | 7.83 | 7.83 |
| 20 Nov 2023, 09:17 | 7.9 | 7.9 |
| 16 Oct 2023, 09:04 | 7.91 | 7.91 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 15 Apr 2026, 6 months ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 10:45 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Jan 2026, 11:14 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Mar 2025, 09:10 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Feb 2025, 10:01 | <0.03 | below 0.03 mg/l (not detected above this) |
| 28 Jan 2025, 08:58 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Dec 2024, 10:56 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Nov 2024, 10:19 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Oct 2024, 09:09 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Jul 2024, 10:23 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Jun 2024, 10:11 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 May 2024, 10:32 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Apr 2024, 10:29 | 0.03 | 0.03 mg/l |
| 18 Mar 2024, 12:07 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Feb 2024, 14:05 | <0.03 | below 0.03 mg/l (not detected above this) |
| 15 Jan 2024, 10:03 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Dec 2023, 10:02 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Nov 2023, 09:17 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Oct 2023, 09:04 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
6.89 mg/l
Sampled 15 Apr 2026, 6 months ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 10:45 | 6.89 | 6.89 mg/l |
| 16 Jan 2026, 11:14 | 24 | 24 mg/l |
| 7 Mar 2025, 09:10 | 15 | 15 mg/l |
| 13 Feb 2025, 10:01 | 17 | 17 mg/l |
| 28 Jan 2025, 08:58 | 15 | 15 mg/l |
| 5 Dec 2024, 10:56 | 17 | 17 mg/l |
| 18 Nov 2024, 10:19 | 6.89 | 6.89 mg/l |
| 18 Oct 2024, 09:09 | 1.3 | 1.3 mg/l |
| 15 Jul 2024, 10:23 | 4.38 | 4.38 mg/l |
| 18 Jun 2024, 10:11 | 4.08 | 4.08 mg/l |
| 13 May 2024, 10:32 | 5.18 | 5.18 mg/l |
| 15 Apr 2024, 10:29 | 6.69 | 6.69 mg/l |
| 18 Mar 2024, 12:07 | 8.49 | 8.49 mg/l |
| 19 Feb 2024, 14:05 | 9.29 | 9.29 mg/l |
| 15 Jan 2024, 10:03 | 11 | 11 mg/l |
| 5 Dec 2023, 10:02 | 9.39 | 9.39 mg/l |
| 20 Nov 2023, 09:17 | 15 | 15 mg/l |
| 16 Oct 2023, 09:04 | 21 | 21 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
below 0.01 mg/l (not detected above this)
Sampled 15 Apr 2026, 6 months ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 10:45 | <0.01 | below 0.01 mg/l (not detected above this) |
| 16 Jan 2026, 11:14 | 0.025 | 0.025 mg/l |
| 7 Mar 2025, 09:10 | <0.01 | below 0.01 mg/l (not detected above this) |
| 13 Feb 2025, 10:01 | <0.01 | below 0.01 mg/l (not detected above this) |
| 28 Jan 2025, 08:58 | 0.024 | 0.024 mg/l |
| 5 Dec 2024, 10:56 | 0.016 | 0.016 mg/l |
| 18 Nov 2024, 10:19 | <0.01 | below 0.01 mg/l (not detected above this) |
| 18 Oct 2024, 09:09 | <0.01 | below 0.01 mg/l (not detected above this) |
| 15 Jul 2024, 10:23 | <0.01 | below 0.01 mg/l (not detected above this) |
| 18 Jun 2024, 10:11 | 0.017 | 0.017 mg/l |
| 13 May 2024, 10:32 | <0.01 | below 0.01 mg/l (not detected above this) |
| 15 Apr 2024, 10:29 | <0.01 | below 0.01 mg/l (not detected above this) |
| 18 Mar 2024, 12:07 | 0.012 | 0.012 mg/l |
| 19 Feb 2024, 14:05 | 0.019 | 0.019 mg/l |
| 15 Jan 2024, 10:03 | 0.019 | 0.019 mg/l |
| 5 Dec 2023, 10:02 | 0.028 | 0.028 mg/l |
| 20 Nov 2023, 09:17 | <0.01 | below 0.01 mg/l (not detected above this) |
| 16 Oct 2023, 09:04 | <0.01 | below 0.01 mg/l (not detected above this) |
Conductivity
at 25 °C · code 0077 · µS/cm
851 µS/cm
Sampled 15 Apr 2026, 6 months ago · 18 results banked
Every result (18)
| Sampled | Result as published | Reads as |
|---|---|---|
| 15 Apr 2026, 10:45 | 851 | 851 µS/cm |
| 16 Jan 2026, 11:14 | 696 | 696 µS/cm |
| 7 Mar 2025, 09:10 | 825 | 825 µS/cm |
| 13 Feb 2025, 10:01 | 790 | 790 µS/cm |
| 28 Jan 2025, 08:58 | 671 | 671 µS/cm |
| 5 Dec 2024, 10:56 | 712 | 712 µS/cm |
| 18 Nov 2024, 10:19 | 815 | 815 µS/cm |
| 18 Oct 2024, 09:09 | 829 | 829 µS/cm |
| 15 Jul 2024, 10:23 | 734 | 734 µS/cm |
| 18 Jun 2024, 10:11 | 773 | 773 µS/cm |
| 13 May 2024, 10:32 | 783 | 783 µS/cm |
| 15 Apr 2024, 10:29 | 735 | 735 µS/cm |
| 18 Mar 2024, 12:07 | 683 | 683 µS/cm |
| 19 Feb 2024, 14:05 | 649 | 649 µS/cm |
| 15 Jan 2024, 10:03 | 762 | 762 µS/cm |
| 5 Dec 2023, 10:02 | 563 | 563 µS/cm |
| 20 Nov 2023, 09:17 | 759 | 759 µS/cm |
| 16 Oct 2023, 09:04 | 783 | 783 µS/cm |
Everything measured here
14 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 14 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 18 | Oct 2023 – Apr 2026 | 95.4% 15 Apr 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 18 | Oct 2023 – Apr 2026 | 10.3 mg/l 15 Apr 2026 |
| Temperature of Water 0076 | River water | 18 | Oct 2023 – Apr 2026 | 11.7 °C 15 Apr 2026 |
| pH 0061 | River water | 18 | Oct 2023 – Apr 2026 | 8.06 15 Apr 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 18 | Oct 2023 – Apr 2026 | below 0.03 mg/l 15 Apr 2026 |
| Nitrate as N 0117 | River water | 18 | Oct 2023 – Apr 2026 | 6.89 mg/l 15 Apr 2026 |
| Orthophosphate, reactive as P 0180 | River water | 18 | Oct 2023 – Apr 2026 | below 0.01 mg/l 15 Apr 2026 |
| Conductivity at 25 C 0077 | River water | 18 | Oct 2023 – Apr 2026 | 851 µS/cm 15 Apr 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 18 | Oct 2023 – Apr 2026 | 300 mg/l 15 Apr 2026 |
| Ammonia un-ionised as N 0119 | River water | 18 | Oct 2023 – Apr 2026 | below 0.00062 mg/l 15 Apr 2026 |
| BOD : 5 Day ATU 0085 | River water | 14 | Feb 2024 – Apr 2026 | 4 mg/l 15 Apr 2026 |
| Nitrite as N 0118 | River water | 18 | Oct 2023 – Apr 2026 | 0.012 mg/l 15 Apr 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 18 | Oct 2023 – Apr 2026 | 6.9 mg/l 15 Apr 2026 |
| No flow /No sample 7668 | River water | 4 | Aug 2024 – Oct 2025 | No flow/discharge at sampling point 21 Oct 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.