River Blyth upstream of Mells near Holton
EA name: R.BLYTH U/S MELLS NEAR HOLTON (also listed as “RSN0469 R.BLYTH U/S MELLS NEAR HOLTON”)
Environment Agency sampling point AN-RSN0469 · 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 Aug 2026, 11:4241 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 20 since 28 Jan 2025 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 640413, 276967As published, to the nearest 1 m. Open in a map
- River, by its own name
- Blyth
- River, by the map
- River BlythPlaced on the river its name gives, 1 m from the line.
- Next gauge downstream
- None tracedIts water reaches the sea without passing a gauge.
- Nearest gauge upstream
- Huntingfield On the Huntingfield Watercourse · 10.0 km along the river
- Why it was sampled
- Monitoring (national agency policy) (20 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
40.8%
Sampled 21 Aug 2026, 41 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Aug 2026, 11:42 | 40.8 | 40.8% |
| 23 Jul 2026, 09:28 | 61 | 61% |
| 2 Jun 2026, 11:09 | 53.7 | 53.7% |
| 6 May 2026, 10:38 | 59.9 | 59.9% |
| 13 Apr 2026, 13:35 | 87.2 | 87.2% |
| 6 Mar 2026, 10:50 | 89.6 | 89.6% |
| 2 Feb 2026, 12:31 | 96 | 96% |
| 12 Jan 2026, 13:17 | 96.2 | 96.2% |
| 4 Dec 2025, 12:55 | 87.5 | 87.5% |
| 11 Nov 2025, 09:41 | 53.6 | 53.6% |
| 14 Oct 2025, 09:48 | 64.5 | 64.5% |
| 3 Sep 2025, 11:48 | 56.2 | 56.2% |
| 12 Aug 2025, 11:53 | 66.3 | 66.3% |
| 24 Jul 2025, 12:17 | 57.5 | 57.5% |
| 23 Jun 2025, 12:18 | 73.6 | 73.6% |
| 30 May 2025, 12:15 | 63 | 63% |
| 24 Apr 2025, 10:39 | 82.7 | 82.7% |
| 4 Mar 2025, 09:31 | 89.6 | 89.6% |
| 14 Feb 2025, 11:53 | 94.1 | 94.1% |
| 28 Jan 2025, 10:44 | 93.1 | 93.1% |
Dissolved oxygen
as O2 · code 9924 · mg/l
4 mg/l
Sampled 21 Aug 2026, 41 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Aug 2026, 11:42 | 4 | 4 mg/l |
| 23 Jul 2026, 09:28 | 6.06 | 6.06 mg/l |
| 2 Jun 2026, 11:09 | 5.28 | 5.28 mg/l |
| 6 May 2026, 10:38 | 6.46 | 6.46 mg/l |
| 13 Apr 2026, 13:35 | 9.79 | 9.79 mg/l |
| 6 Mar 2026, 10:50 | 10.5 | 10.5 mg/l |
| 2 Feb 2026, 12:31 | 11.8 | 11.8 mg/l |
| 12 Jan 2026, 13:17 | 12 | 12 mg/l |
| 4 Dec 2025, 12:55 | 10.5 | 10.5 mg/l |
| 11 Nov 2025, 09:41 | 5.88 | 5.88 mg/l |
| 14 Oct 2025, 09:48 | 6.77 | 6.77 mg/l |
| 3 Sep 2025, 11:48 | 5.45 | 5.45 mg/l |
| 12 Aug 2025, 11:53 | 6.25 | 6.25 mg/l |
| 24 Jul 2025, 12:17 | 5.6 | 5.6 mg/l |
| 23 Jun 2025, 12:18 | 7.33 | 7.33 mg/l |
| 30 May 2025, 12:15 | 6.18 | 6.18 mg/l |
| 24 Apr 2025, 10:39 | 8.94 | 8.94 mg/l |
| 4 Mar 2025, 09:31 | 11.6 | 11.6 mg/l |
| 14 Feb 2025, 11:53 | 12.1 | 12.1 mg/l |
| 28 Jan 2025, 10:44 | 11.5 | 11.5 mg/l |
Water temperature
code 0076 · °C
16.1 °C
Sampled 21 Aug 2026, 41 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Aug 2026, 11:42 | 16.1 | 16.1 °C |
| 23 Jul 2026, 09:28 | 15.5 | 15.5 °C |
| 2 Jun 2026, 11:09 | 16 | 16 °C |
| 6 May 2026, 10:38 | 11.8 | 11.8 °C |
| 13 Apr 2026, 13:35 | 10.1 | 10.1 °C |
| 6 Mar 2026, 10:50 | 8.4 | 8.4 °C |
| 2 Feb 2026, 12:31 | 6.5 | 6.5 °C |
| 12 Jan 2026, 13:17 | 5.7 | 5.7 °C |
| 4 Dec 2025, 12:55 | 7.3 | 7.3 °C |
| 11 Nov 2025, 09:41 | 11.1 | 11.1 °C |
| 14 Oct 2025, 09:48 | 13 | 13 °C |
| 3 Sep 2025, 11:48 | 16.7 | 16.7 °C |
| 12 Aug 2025, 11:53 | 18 | 18 °C |
| 24 Jul 2025, 12:17 | 16.5 | 16.5 °C |
| 23 Jun 2025, 12:18 | 15.4 | 15.4 °C |
| 30 May 2025, 12:15 | 16.1 | 16.1 °C |
| 24 Apr 2025, 10:39 | 11.7 | 11.7 °C |
| 4 Mar 2025, 09:31 | 4.4 | 4.4 °C |
| 14 Feb 2025, 11:53 | 4.6 | 4.6 °C |
| 28 Jan 2025, 10:44 | 6.4 | 6.4 °C |
pH
code 0061
7.28
Sampled 21 Aug 2026, 41 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Aug 2026, 11:42 | 7.28 | 7.28 |
| 23 Jul 2026, 09:28 | 7.53 | 7.53 |
| 2 Jun 2026, 11:09 | 7.32 | 7.32 |
| 6 May 2026, 10:38 | 7.37 | 7.37 |
| 13 Apr 2026, 13:35 | 7.65 | 7.65 |
| 6 Mar 2026, 10:50 | 7.71 | 7.71 |
| 2 Feb 2026, 12:31 | 8.01 | 8.01 |
| 12 Jan 2026, 13:17 | 7.82 | 7.82 |
| 4 Dec 2025, 12:55 | 7.79 | 7.79 |
| 11 Nov 2025, 09:41 | 7.71 | 7.71 |
| 14 Oct 2025, 09:48 | 7.44 | 7.44 |
| 3 Sep 2025, 11:48 | 7.4 | 7.4 |
| 12 Aug 2025, 11:53 | 7.39 | 7.39 |
| 24 Jul 2025, 12:17 | 7.32 | 7.32 |
| 23 Jun 2025, 12:18 | 7.54 | 7.54 |
| 30 May 2025, 12:15 | 7.46 | 7.46 |
| 24 Apr 2025, 10:39 | 7.4 | 7.4 |
| 4 Mar 2025, 09:31 | 8.01 | 8.01 |
| 14 Feb 2025, 11:53 | 8 | 8 |
| 28 Jan 2025, 10:44 | 8.01 | 8.01 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.2 mg/l
Sampled 21 Aug 2026, 41 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Aug 2026, 11:42 | 0.2 | 0.2 mg/l |
| 23 Jul 2026, 09:28 | 0.065 | 0.065 mg/l |
| 2 Jun 2026, 11:09 | 0.074 | 0.074 mg/l |
| 6 May 2026, 10:38 | 0.2 | 0.2 mg/l |
| 13 Apr 2026, 13:35 | 0.23 | 0.23 mg/l |
| 6 Mar 2026, 10:50 | 0.051 | 0.051 mg/l |
| 2 Feb 2026, 12:31 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Jan 2026, 13:17 | 0.082 | 0.082 mg/l |
| 4 Dec 2025, 12:55 | 0.099 | 0.099 mg/l |
| 11 Nov 2025, 09:41 | 0.97 | 0.97 mg/l |
| 14 Oct 2025, 09:48 | 0.048 | 0.048 mg/l |
| 3 Sep 2025, 11:48 | 0.15 | 0.15 mg/l |
| 12 Aug 2025, 11:53 | 0.044 | 0.044 mg/l |
| 24 Jul 2025, 12:17 | 0.043 | 0.043 mg/l |
| 23 Jun 2025, 12:18 | 0.086 | 0.086 mg/l |
| 30 May 2025, 12:15 | 0.092 | 0.092 mg/l |
| 24 Apr 2025, 10:39 | 0.043 | 0.043 mg/l |
| 4 Mar 2025, 09:31 | 0.059 | 0.059 mg/l |
| 14 Feb 2025, 11:53 | 0.075 | 0.075 mg/l |
| 28 Jan 2025, 10:44 | 0.04 | 0.04 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
7.69 mg/l
Sampled 21 Aug 2026, 41 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Aug 2026, 11:42 | 7.69 | 7.69 mg/l |
| 23 Jul 2026, 09:28 | 12.9 | 12.9 mg/l |
| 2 Jun 2026, 11:09 | 11.7 | 11.7 mg/l |
| 6 May 2026, 10:38 | 10.8 | 10.8 mg/l |
| 13 Apr 2026, 13:35 | 4.79 | 4.79 mg/l |
| 6 Mar 2026, 10:50 | 5.56 | 5.56 mg/l |
| 2 Feb 2026, 12:31 | 11 | 11 mg/l |
| 12 Jan 2026, 13:17 | 13 | 13 mg/l |
| 4 Dec 2025, 12:55 | 15.9 | 15.9 mg/l |
| 11 Nov 2025, 09:41 | 6.18 | 6.18 mg/l |
| 14 Oct 2025, 09:48 | 12 | 12 mg/l |
| 3 Sep 2025, 11:48 | 5.21 | 5.21 mg/l |
| 12 Aug 2025, 11:53 | 13.9 | 13.9 mg/l |
| 24 Jul 2025, 12:17 | 5.27 | 5.27 mg/l |
| 23 Jun 2025, 12:18 | 8.33 | 8.33 mg/l |
| 30 May 2025, 12:15 | 9.8 | 9.8 mg/l |
| 24 Apr 2025, 10:39 | 7.96 | 7.96 mg/l |
| 4 Mar 2025, 09:31 | 8.17 | 8.17 mg/l |
| 14 Feb 2025, 11:53 | 11 | 11 mg/l |
| 28 Jan 2025, 10:44 | 14 | 14 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.029 mg/l
Sampled 21 Aug 2026, 41 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Aug 2026, 11:42 | 0.029 | 0.029 mg/l |
| 23 Jul 2026, 09:28 | 0.026 | 0.026 mg/l |
| 2 Jun 2026, 11:09 | 0.028 | 0.028 mg/l |
| 6 May 2026, 10:38 | 0.038 | 0.038 mg/l |
| 13 Apr 2026, 13:35 | 0.033 | 0.033 mg/l |
| 6 Mar 2026, 10:50 | 0.044 | 0.044 mg/l |
| 2 Feb 2026, 12:31 | 0.069 | 0.069 mg/l |
| 12 Jan 2026, 13:17 | 0.071 | 0.071 mg/l |
| 4 Dec 2025, 12:55 | 0.038 | 0.038 mg/l |
| 11 Nov 2025, 09:41 | 0.038 | 0.038 mg/l |
| 14 Oct 2025, 09:48 | 0.018 | 0.018 mg/l |
| 3 Sep 2025, 11:48 | 0.04 | 0.04 mg/l |
| 12 Aug 2025, 11:53 | 0.023 | 0.023 mg/l |
| 24 Jul 2025, 12:17 | 0.035 | 0.035 mg/l |
| 23 Jun 2025, 12:18 | 0.022 | 0.022 mg/l |
| 30 May 2025, 12:15 | 0.031 | 0.031 mg/l |
| 24 Apr 2025, 10:39 | 0.013 | 0.013 mg/l |
| 4 Mar 2025, 09:31 | 0.024 | 0.024 mg/l |
| 14 Feb 2025, 11:53 | 0.047 | 0.047 mg/l |
| 28 Jan 2025, 10:44 | 0.067 | 0.067 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
1130 µS/cm
Sampled 21 Aug 2026, 41 days ago · 20 results banked
Every result (20)
| Sampled | Result as published | Reads as |
|---|---|---|
| 21 Aug 2026, 11:42 | 1130 | 1130 µS/cm |
| 23 Jul 2026, 09:28 | 1325 | 1325 µS/cm |
| 2 Jun 2026, 11:09 | 1120 | 1120 µS/cm |
| 6 May 2026, 10:38 | 1194 | 1194 µS/cm |
| 13 Apr 2026, 13:35 | 1083 | 1083 µS/cm |
| 6 Mar 2026, 10:50 | 926 | 926 µS/cm |
| 2 Feb 2026, 12:31 | 723 | 723 µS/cm |
| 12 Jan 2026, 13:17 | 789 | 789 µS/cm |
| 4 Dec 2025, 12:55 | 973 | 973 µS/cm |
| 11 Nov 2025, 09:41 | 1117 | 1117 µS/cm |
| 14 Oct 2025, 09:48 | 1253 | 1253 µS/cm |
| 3 Sep 2025, 11:48 | 919 | 919 µS/cm |
| 12 Aug 2025, 11:53 | 1299 | 1299 µS/cm |
| 24 Jul 2025, 12:17 | 921 | 921 µS/cm |
| 23 Jun 2025, 12:18 | 1131 | 1131 µS/cm |
| 30 May 2025, 12:15 | 1163 | 1163 µS/cm |
| 24 Apr 2025, 10:39 | 1105 | 1105 µS/cm |
| 4 Mar 2025, 09:31 | 996 | 996 µS/cm |
| 14 Feb 2025, 11:53 | 895 | 895 µS/cm |
| 28 Jan 2025, 10:44 | 789 | 789 µS/cm |
Everything measured here
20 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 20 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 20 | Jan 2025 – Aug 2026 | 40.8% 21 Aug 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 20 | Jan 2025 – Aug 2026 | 4 mg/l 21 Aug 2026 |
| Temperature of Water 0076 | River water | 20 | Jan 2025 – Aug 2026 | 16.1 °C 21 Aug 2026 |
| pH 0061 | River water | 20 | Jan 2025 – Aug 2026 | 7.28 21 Aug 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 20 | Jan 2025 – Aug 2026 | 0.2 mg/l 21 Aug 2026 |
| Nitrate as N 0117 | River water | 20 | Jan 2025 – Aug 2026 | 7.69 mg/l 21 Aug 2026 |
| Orthophosphate, reactive as P 0180 | River water | 20 | Jan 2025 – Aug 2026 | 0.029 mg/l 21 Aug 2026 |
| Conductivity at 25 C 0077 | River water | 20 | Jan 2025 – Aug 2026 | 1130 µS/cm 21 Aug 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 20 | Jan 2025 – Aug 2026 | 220 mg/l 21 Aug 2026 |
| Ammonia un-ionised as N 0119 | River water | 20 | Jan 2025 – Aug 2026 | 0.00111 mg/l 21 Aug 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 20 | Jan 2025 – Aug 2026 | 5.8 mg/l 21 Aug 2026 |
| Chloride 0172 | River water | 20 | Jan 2025 – Aug 2026 | 130 mg/l 21 Aug 2026 |
| Flow Type 2896 | River water | 16 | Jan 2025 – Aug 2026 | Moderate Flow 21 Aug 2026 |
| LCMS Screen : Semi Quantitative 7299 | River water | 2 | Mar 2026 – Jun 2026 | 1 text result 2 Jun 2026 |
| Nitrite as N 0118 | River water | 20 | Jan 2025 – Aug 2026 | 0.21 mg/l 21 Aug 2026 |
| Nitrogen, Total as N 9686 | River water | 20 | Jan 2025 – Aug 2026 | 8.8 mg/l 21 Aug 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 20 | Jan 2025 – Aug 2026 | 7.9 mg/l 21 Aug 2026 |
| Phosphorus, Total as P 0348 | River water | 20 | Jan 2025 – Aug 2026 | 0.046 mg/l 21 Aug 2026 |
| Silica, reactive as SiO2 0182 | River water | 20 | Jan 2025 – Aug 2026 | 12 mg/l 21 Aug 2026 |
| Solids, Suspended at 105 C 0135 | River water | 9 | Dec 2025 – Aug 2026 | 3.3 mg/l 21 Aug 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.