Northlew Stream upstream of Northlew sewage treatment works
EA name: NORTHLEW STREAM U/S NORTHLEW STW
Environment Agency sampling point SW-72932020 · 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
- 3 Jul 2026, 12:183 months ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 20 since 2 Oct 2023 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Planned investigation (local monitoring)
- Where
- National Grid 250756, 99026As published, to the nearest 1 m. Open in a map
- River, by its own name
- Northlew Stream
- River, by the map
- Not placedIts name gives Northlew Stream; the only line close by, 0 m away, is River Lew and is not traced into it. The river map cannot say which watercourse this is.
- Next gauge downstream
- Not known
- Why it was sampled
- Planned investigation (local monitoring) (20 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
87.5%
Sampled 3 Jul 2026, 3 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Jul 2026, 12:18 | 87.5 | 87.5% |
| 19 Jun 2026, 10:37 | 89.7 | 89.7% |
| 7 May 2026, 12:45 | 99.2 | 99.2% |
| 10 Apr 2026, 13:22 | 97.7 | 97.7% |
| 31 Mar 2025, 10:39 | 100.5 | 100.5% |
| 6 Feb 2025, 10:48 | 98.8 | 98.8% |
| 3 Jan 2025, 13:31 | 99 | 99% |
| 10 Dec 2024, 11:58 | 97.5 | 97.5% |
| 26 Nov 2024, 13:30 | 98.6 | 98.6% |
| 21 Oct 2024, 12:39 | 98.1 | 98.1% |
| 13 Sep 2024, 10:16 | 99.4 | 99.4% |
| 2 Aug 2024, 13:16 | 99.3 | 99.3% |
| 5 Jul 2024, 11:48 | 95.5 | 95.5% |
| 20 Jun 2024, 12:00 | 91.8 | 91.8% |
| 30 May 2024, 13:47 | 97.8 | 97.8% |
| 1 Feb 2024, 12:55 | 99 | 99% |
| 12 Jan 2024, 11:39 | 98.8 | 98.8% |
| 7 Dec 2023, 10:46 | 100.6 | 100.6% |
| 3 Nov 2023, 13:01 | 96.2 | 96.2% |
| 2 Oct 2023, 12:29 | 96.4 | 96.4% |
Dissolved oxygen
as O2 · code 9924 · mg/l
8.63 mg/l
Sampled 3 Jul 2026, 3 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Jul 2026, 12:18 | 8.63 | 8.63 mg/l |
| 19 Jun 2026, 10:37 | 8.7 | 8.7 mg/l |
| 7 May 2026, 12:45 | 10.9 | 10.9 mg/l |
| 10 Apr 2026, 13:22 | 11.2 | 11.2 mg/l |
| 31 Mar 2025, 10:39 | 11.6 | 11.6 mg/l |
| 6 Feb 2025, 10:48 | 13 | 13 mg/l |
| 3 Jan 2025, 13:31 | 12.7 | 12.7 mg/l |
| 10 Dec 2024, 11:58 | 11.6 | 11.6 mg/l |
| 26 Nov 2024, 13:30 | 11.3 | 11.3 mg/l |
| 21 Oct 2024, 12:39 | 10.5 | 10.5 mg/l |
| 13 Sep 2024, 10:16 | 11.4 | 11.4 mg/l |
| 2 Aug 2024, 13:16 | 9.43 | 9.43 mg/l |
| 5 Jul 2024, 11:48 | 9.71 | 9.71 mg/l |
| 20 Jun 2024, 12:00 | 9.48 | 9.48 mg/l |
| 30 May 2024, 13:47 | 10.4 | 10.4 mg/l |
| 1 Feb 2024, 12:55 | 11.9 | 11.9 mg/l |
| 12 Jan 2024, 11:39 | 12.5 | 12.5 mg/l |
| 7 Dec 2023, 10:46 | 11.3 | 11.3 mg/l |
| 3 Nov 2023, 13:01 | 10.5 | 10.5 mg/l |
| 2 Oct 2023, 12:29 | 9.63 | 9.63 mg/l |
Water temperature
code 0076 · °C
15.9 °C
Sampled 3 Jul 2026, 3 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Jul 2026, 12:18 | 15.9 | 15.9 °C |
| 19 Jun 2026, 10:37 | 16.7 | 16.7 °C |
| 7 May 2026, 12:45 | 11.2 | 11.2 °C |
| 10 Apr 2026, 13:22 | 9.1 | 9.1 °C |
| 31 Mar 2025, 10:39 | 9 | 9 °C |
| 6 Feb 2025, 10:48 | 3.8 | 3.8 °C |
| 3 Jan 2025, 13:31 | 4.8 | 4.8 °C |
| 10 Dec 2024, 11:58 | 7.6 | 7.6 °C |
| 26 Nov 2024, 13:30 | 9.3 | 9.3 °C |
| 21 Oct 2024, 12:39 | 12.2 | 12.2 °C |
| 13 Sep 2024, 10:16 | 9.1 | 9.1 °C |
| 2 Aug 2024, 13:16 | 17.7 | 17.7 °C |
| 5 Jul 2024, 11:48 | 14.5 | 14.5 °C |
| 20 Jun 2024, 12:00 | 13.8 | 13.8 °C |
| 30 May 2024, 13:47 | 12.6 | 12.6 °C |
| 1 Feb 2024, 12:55 | 7.3 | 7.3 °C |
| 12 Jan 2024, 11:39 | 5.3 | 5.3 °C |
| 7 Dec 2023, 10:46 | 10.2 | 10.2 °C |
| 3 Nov 2023, 13:01 | 11.4 | 11.4 °C |
| 2 Oct 2023, 12:29 | 15.3 | 15.3 °C |
pH
code 0061
7.3
Sampled 3 Jul 2026, 3 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Jul 2026, 12:18 | 7.3 | 7.3 |
| 19 Jun 2026, 10:37 | 7.26 | 7.26 |
| 7 May 2026, 12:45 | 7.46 | 7.46 |
| 10 Apr 2026, 13:22 | 7.42 | 7.42 |
| 31 Mar 2025, 10:39 | 7.25 | 7.25 |
| 6 Feb 2025, 10:48 | 7.3 | 7.3 |
| 3 Jan 2025, 13:31 | 7.17 | 7.17 |
| 10 Dec 2024, 11:58 | 7.03 | 7.03 |
| 26 Nov 2024, 13:30 | 7.14 | 7.14 |
| 21 Oct 2024, 12:39 | 7.14 | 7.14 |
| 13 Sep 2024, 10:16 | 7.76 | 7.76 |
| 2 Aug 2024, 13:16 | 7.5 | 7.5 |
| 5 Jul 2024, 11:48 | 7.54 | 7.54 |
| 20 Jun 2024, 12:00 | 7.49 | 7.49 |
| 30 May 2024, 13:47 | 7.54 | 7.54 |
| 1 Feb 2024, 12:55 | 7.23 | 7.23 |
| 12 Jan 2024, 11:39 | 7.24 | 7.24 |
| 7 Dec 2023, 10:46 | 6.86 | 6.86 |
| 3 Nov 2023, 13:01 | 7.04 | 7.04 |
| 2 Oct 2023, 12:29 | 7.12 | 7.12 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.12 mg/l
Sampled 3 Jul 2026, 3 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Jul 2026, 12:18 | 0.12 | 0.12 mg/l |
| 19 Jun 2026, 10:37 | 0.13 | 0.13 mg/l |
| 7 May 2026, 12:45 | 0.18 | 0.18 mg/l |
| 10 Apr 2026, 13:22 | 0.079 | 0.079 mg/l |
| 31 Mar 2025, 10:39 | 0.13 | 0.13 mg/l |
| 6 Feb 2025, 10:48 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Jan 2025, 13:31 | <0.03 | below 0.03 mg/l (not detected above this) |
| 10 Dec 2024, 11:58 | <0.03 | below 0.03 mg/l (not detected above this) |
| 26 Nov 2024, 13:30 | 0.039 | 0.039 mg/l |
| 21 Oct 2024, 12:39 | 0.06 | 0.06 mg/l |
| 13 Sep 2024, 10:16 | 0.047 | 0.047 mg/l |
| 2 Aug 2024, 13:16 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Jul 2024, 11:48 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Jun 2024, 12:00 | 0.035 | 0.035 mg/l |
| 30 May 2024, 13:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 1 Feb 2024, 12:55 | 0.053 | 0.053 mg/l |
| 12 Jan 2024, 11:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Dec 2023, 10:46 | 0.088 | 0.088 mg/l |
| 3 Nov 2023, 13:01 | 0.04 | 0.04 mg/l |
| 2 Oct 2023, 12:29 | 0.033 | 0.033 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
1.37 mg/l
Sampled 3 Jul 2026, 3 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Jul 2026, 12:18 | 1.37 | 1.37 mg/l |
| 19 Jun 2026, 10:37 | 1.37 | 1.37 mg/l |
| 7 May 2026, 12:45 | 1.38 | 1.38 mg/l |
| 10 Apr 2026, 13:22 | 1.29 | 1.29 mg/l |
| 31 Mar 2025, 10:39 | 5.32 | 5.32 mg/l |
| 6 Feb 2025, 10:48 | 1.9 | 1.9 mg/l |
| 3 Jan 2025, 13:31 | 2.1 | 2.1 mg/l |
| 10 Dec 2024, 11:58 | 2.1 | 2.1 mg/l |
| 26 Nov 2024, 13:30 | 2.59 | 2.59 mg/l |
| 21 Oct 2024, 12:39 | 2.09 | 2.09 mg/l |
| 13 Sep 2024, 10:16 | 1.59 | 1.59 mg/l |
| 2 Aug 2024, 13:16 | 1.1 | 1.1 mg/l |
| 5 Jul 2024, 11:48 | 1.09 | 1.09 mg/l |
| 20 Jun 2024, 12:00 | 1.68 | 1.68 mg/l |
| 30 May 2024, 13:47 | 0.996 | 0.996 mg/l |
| 1 Feb 2024, 12:55 | 1.69 | 1.69 mg/l |
| 12 Jan 2024, 11:39 | 2.1 | 2.1 mg/l |
| 7 Dec 2023, 10:46 | 2.49 | 2.49 mg/l |
| 3 Nov 2023, 13:01 | 2.69 | 2.69 mg/l |
| 2 Oct 2023, 12:29 | 1.69 | 1.69 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.15 mg/l
Sampled 3 Jul 2026, 3 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Jul 2026, 12:18 | 0.15 | 0.15 mg/l |
| 19 Jun 2026, 10:37 | 0.15 | 0.15 mg/l |
| 7 May 2026, 12:45 | 0.18 | 0.18 mg/l |
| 10 Apr 2026, 13:22 | 0.048 | 0.048 mg/l |
| 31 Mar 2025, 10:39 | 1 | 1 mg/l |
| 6 Feb 2025, 10:48 | 0.026 | 0.026 mg/l |
| 3 Jan 2025, 13:31 | 0.018 | 0.018 mg/l |
| 10 Dec 2024, 11:58 | <0.01 | below 0.01 mg/l (not detected above this) |
| 26 Nov 2024, 13:30 | 0.033 | 0.033 mg/l |
| 21 Oct 2024, 12:39 | 0.043 | 0.043 mg/l |
| 13 Sep 2024, 10:16 | 0.054 | 0.054 mg/l |
| 2 Aug 2024, 13:16 | 0.023 | 0.023 mg/l |
| 5 Jul 2024, 11:48 | 0.061 | 0.061 mg/l |
| 20 Jun 2024, 12:00 | 0.24 | 0.24 mg/l |
| 30 May 2024, 13:47 | 0.037 | 0.037 mg/l |
| 1 Feb 2024, 12:55 | 0.039 | 0.039 mg/l |
| 12 Jan 2024, 11:39 | 0.038 | 0.038 mg/l |
| 7 Dec 2023, 10:46 | 0.058 | 0.058 mg/l |
| 3 Nov 2023, 13:01 | 0.037 | 0.037 mg/l |
| 2 Oct 2023, 12:29 | 0.069 | 0.069 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
176 µS/cm
Sampled 3 Jul 2026, 3 months ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 3 Jul 2026, 12:18 | 176 | 176 µS/cm |
| 19 Jun 2026, 10:37 | 157 | 157 µS/cm |
| 7 May 2026, 12:45 | 152 | 152 µS/cm |
| 10 Apr 2026, 13:22 | 125 | 125 µS/cm |
| 31 Mar 2025, 10:39 | 207 | 207 µS/cm |
| 6 Feb 2025, 10:48 | 121 | 121 µS/cm |
| 3 Jan 2025, 13:31 | 133 | 133 µS/cm |
| 10 Dec 2024, 11:58 | 122 | 122 µS/cm |
| 26 Nov 2024, 13:30 | 118 | 118 µS/cm |
| 21 Oct 2024, 12:39 | 120 | 120 µS/cm |
| 13 Sep 2024, 10:16 | 135 | 135 µS/cm |
| 2 Aug 2024, 13:16 | 153 | 153 µS/cm |
| 5 Jul 2024, 11:48 | 166 | 166 µS/cm |
| 20 Jun 2024, 12:00 | 170 | 170 µS/cm |
| 30 May 2024, 13:47 | 130 | 130 µS/cm |
| 1 Feb 2024, 12:55 | 129 | 129 µS/cm |
| 12 Jan 2024, 11:39 | 127 | 127 µS/cm |
| 7 Dec 2023, 10:46 | 129 | 129 µS/cm |
| 3 Nov 2023, 13:01 | 130 | 130 µS/cm |
| 2 Oct 2023, 12:29 | 156 | 156 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 | 20 | Oct 2023 – Jul 2026 | 87.5% 3 Jul 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 20 | Oct 2023 – Jul 2026 | 8.63 mg/l 3 Jul 2026 |
| Temperature of Water 0076 | River water | 20 | Oct 2023 – Jul 2026 | 15.9 °C 3 Jul 2026 |
| pH 0061 | River water | 20 | Oct 2023 – Jul 2026 | 7.3 3 Jul 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 20 | Oct 2023 – Jul 2026 | 0.12 mg/l 3 Jul 2026 |
| Nitrate as N 0117 | River water | 20 | Oct 2023 – Jul 2026 | 1.37 mg/l 3 Jul 2026 |
| Orthophosphate, reactive as P 0180 | River water | 20 | Oct 2023 – Jul 2026 | 0.15 mg/l 3 Jul 2026 |
| Conductivity at 25 C 0077 | River water | 20 | Oct 2023 – Jul 2026 | 176 µS/cm 3 Jul 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 19 | Oct 2023 – Jul 2026 | 44 mg/l 3 Jul 2026 |
| Ammonia un-ionised as N 0119 | River water | 20 | Oct 2023 – Jul 2026 | 0.00069 mg/l 3 Jul 2026 |
| Nitrite as N 0118 | River water | 20 | Oct 2023 – Jul 2026 | 0.032 mg/l 3 Jul 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 20 | Oct 2023 – Jul 2026 | 1.4 mg/l 3 Jul 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.