Trethew Stream at Trebrownbridge
EA name: SSN0392 TRETHEW STREAM AT TREBROWNBRIDGE
Environment Agency sampling point SW-SSN0392 · 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 Aug 2026, 15:0555 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 8 since 22 Jan 2026 Imported periods: 1 Oct 2023 – 8 Oct 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Monitoring (national agency policy)
- Where
- National Grid 229846, 59688As published, to the nearest 1 m. Open in a map
- River, by its own name
- Trethew Stream
- River, by the map
- An unnamed streamPlaced by position alone (the only river line close by), 2 m from the line.
- Next gauge downstream
- Trebrownbridge On the River Seaton · 0.3 km along the riverTREBROWNBRIDGE 0.3 km along the river
- Why it was sampled
- Monitoring (national agency policy) (8 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
95.3%
Sampled 14 Aug 2026, 55 days ago · 8 results banked
Every result (8)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 15:05 | 95.3 | 95.3% |
| 9 Jul 2026, 14:18 | 94.4 | 94.4% |
| 9 Jun 2026, 15:42 | 96.4 | 96.4% |
| 21 May 2026, 13:16 | 97 | 97% |
| 16 Apr 2026, 10:39 | 99.6 | 99.6% |
| 9 Mar 2026, 14:06 | 98.8 | 98.8% |
| 6 Feb 2026, 12:48 | 99.1 | 99.1% |
| 22 Jan 2026, 10:46 | 98.1 | 98.1% |
Dissolved oxygen
as O2 · code 9924 · mg/l
8.71 mg/l
Sampled 14 Aug 2026, 55 days ago · 8 results banked
Every result (8)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 15:05 | 8.71 | 8.71 mg/l |
| 9 Jul 2026, 14:18 | 9.08 | 9.08 mg/l |
| 9 Jun 2026, 15:42 | 10 | 10 mg/l |
| 21 May 2026, 13:16 | 10.1 | 10.1 mg/l |
| 16 Apr 2026, 10:39 | 11 | 11 mg/l |
| 9 Mar 2026, 14:06 | 10.8 | 10.8 mg/l |
| 6 Feb 2026, 12:48 | 11 | 11 mg/l |
| 22 Jan 2026, 10:46 | 11.2 | 11.2 mg/l |
Water temperature
code 0076 · °C
19.6 °C
Sampled 14 Aug 2026, 55 days ago · 8 results banked
Every result (8)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 15:05 | 19.6 | 19.6 °C |
| 9 Jul 2026, 14:18 | 17.1 | 17.1 °C |
| 9 Jun 2026, 15:42 | 13.6 | 13.6 °C |
| 21 May 2026, 13:16 | 13.5 | 13.5 °C |
| 16 Apr 2026, 10:39 | 11 | 11 °C |
| 9 Mar 2026, 14:06 | 11.4 | 11.4 °C |
| 6 Feb 2026, 12:48 | 10.8 | 10.8 °C |
| 22 Jan 2026, 10:46 | 9.5 | 9.5 °C |
pH
code 0061
7.66
Sampled 14 Aug 2026, 55 days ago · 8 results banked
Every result (8)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 15:05 | 7.66 | 7.66 |
| 9 Jul 2026, 14:18 | 7.91 | 7.91 |
| 9 Jun 2026, 15:42 | 7.63 | 7.63 |
| 21 May 2026, 13:16 | 7.78 | 7.78 |
| 16 Apr 2026, 10:39 | 7.58 | 7.58 |
| 9 Mar 2026, 14:06 | 7.51 | 7.51 |
| 6 Feb 2026, 12:48 | 7.62 | 7.62 |
| 22 Jan 2026, 10:46 | 7.46 | 7.46 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 14 Aug 2026, 55 days ago · 8 results banked
Every result (8)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 15:05 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Jul 2026, 14:18 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Jun 2026, 15:42 | <0.03 | below 0.03 mg/l (not detected above this) |
| 21 May 2026, 13:16 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Apr 2026, 10:39 | <0.03 | below 0.03 mg/l (not detected above this) |
| 9 Mar 2026, 14:06 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Feb 2026, 12:48 | <0.03 | below 0.03 mg/l (not detected above this) |
| 22 Jan 2026, 10:46 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
2.2 mg/l
Sampled 14 Aug 2026, 55 days ago · 8 results banked
Every result (8)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 15:05 | 2.2 | 2.2 mg/l |
| 9 Jul 2026, 14:18 | 2.8 | 2.8 mg/l |
| 9 Jun 2026, 15:42 | 2.5 | 2.5 mg/l |
| 21 May 2026, 13:16 | 2.8 | 2.8 mg/l |
| 16 Apr 2026, 10:39 | 3.2 | 3.2 mg/l |
| 9 Mar 2026, 14:06 | 3.9 | 3.9 mg/l |
| 6 Feb 2026, 12:48 | 3.7 | 3.7 mg/l |
| 22 Jan 2026, 10:46 | 3.6 | 3.6 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.018 mg/l
Sampled 9 Jul 2026, 3 months ago · 7 results banked
Every result (7)
| Sampled | Result as published | Reads as |
|---|---|---|
| 9 Jul 2026, 14:18 | 0.018 | 0.018 mg/l |
| 9 Jun 2026, 15:42 | 0.014 | 0.014 mg/l |
| 21 May 2026, 13:16 | 0.017 | 0.017 mg/l |
| 16 Apr 2026, 10:39 | <0.01 | below 0.01 mg/l (not detected above this) |
| 9 Mar 2026, 14:06 | 0.013 | 0.013 mg/l |
| 6 Feb 2026, 12:48 | 0.011 | 0.011 mg/l |
| 22 Jan 2026, 10:46 | 0.012 | 0.012 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
240 µS/cm
Sampled 14 Aug 2026, 55 days ago · 8 results banked
Every result (8)
| Sampled | Result as published | Reads as |
|---|---|---|
| 14 Aug 2026, 15:05 | 240 | 240 µS/cm |
| 9 Jul 2026, 14:18 | 237 | 237 µS/cm |
| 9 Jun 2026, 15:42 | 225 | 225 µS/cm |
| 21 May 2026, 13:16 | 226 | 226 µS/cm |
| 16 Apr 2026, 10:39 | 227 | 227 µS/cm |
| 9 Mar 2026, 14:06 | 217 | 217 µS/cm |
| 6 Feb 2026, 12:48 | 202 | 202 µS/cm |
| 22 Jan 2026, 10:46 | 202 | 202 µS/cm |
Everything measured here
47 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 47 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 8 | Jan 2026 – Aug 2026 | 95.3% 14 Aug 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 8 | Jan 2026 – Aug 2026 | 8.71 mg/l 14 Aug 2026 |
| Temperature of Water 0076 | River water | 8 | Jan 2026 – Aug 2026 | 19.6 °C 14 Aug 2026 |
| pH 0061 | River water | 8 | Jan 2026 – Aug 2026 | 7.66 14 Aug 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 8 | Jan 2026 – Aug 2026 | below 0.03 mg/l 14 Aug 2026 |
| Nitrate as N 0117 | River water | 8 | Jan 2026 – Aug 2026 | 2.2 mg/l 14 Aug 2026 |
| Orthophosphate, reactive as P 0180 | River water | 7 | Jan 2026 – Jul 2026 | 0.018 mg/l 9 Jul 2026 |
| Conductivity at 25 C 0077 | River water | 8 | Jan 2026 – Aug 2026 | 240 µS/cm 14 Aug 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 8 | Jan 2026 – Aug 2026 | 61 mg/l 14 Aug 2026 |
| Aluminium, Dissolved 6037 | River water | 1 | Jan 2026 – Jan 2026 | below 20 µg/l 22 Jan 2026 |
| Aminomethylphosphonic acid 7125 | River water | 4 | Jan 2026 – Apr 2026 | below 0.1 µg/l 16 Apr 2026 |
| Ammonia un-ionised as N 0119 | River water | 8 | Jan 2026 – Aug 2026 | below 0.00051 mg/l 14 Aug 2026 |
| Barium, Dissolved 9446 | River water | 1 | Jan 2026 – Jan 2026 | below 10 µg/l 22 Jan 2026 |
| Boron, Dissolved 9447 | River water | 1 | Jan 2026 – Jan 2026 | below 100 µg/l 22 Jan 2026 |
| Cadmium, Dissolved 0106 | River water | 1 | Jan 2026 – Jan 2026 | below 0.01 µg/l 22 Jan 2026 |
| Calcium, Dissolved 0239 | River water | 1 | Jan 2026 – Jan 2026 | 17 mg/l 22 Jan 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 8 | Jan 2026 – Aug 2026 | 1.5 mg/l 14 Aug 2026 |
| Chloride 0172 | River water | 8 | Jan 2026 – Aug 2026 | 23 mg/l 14 Aug 2026 |
| Chromium, Dissolved 3409 | River water | 1 | Jan 2026 – Jan 2026 | below 0.5 µg/l 22 Jan 2026 |
| Copper : BLM Bioavailable 4821 | River water | 1 | Jan 2026 – Jan 2026 | 0.12 µg/l 22 Jan 2026 |
| Copper, Dissolved 6450 | River water | 1 | Jan 2026 – Jan 2026 | 0.58 µg/l 22 Jan 2026 |
| Flow Type 2896 | River water | 8 | Jan 2026 – Aug 2026 | Moderate Flow 14 Aug 2026 |
| GCMS Screen : Target Based multi-residue screening : Semi Quantitative 4994 | River water | 1 | Jun 2026 – Jun 2026 | 1 text result 9 Jun 2026 |
| Glyphosate 3007 | River water | 4 | Jan 2026 – Apr 2026 | below 0.1 µg/l 16 Apr 2026 |
| Hardness, Calcium 0163 | River water | 1 | Jan 2026 – Jan 2026 | 42.4 mg/l 22 Jan 2026 |
| Hardness, Total as CaCO3 0158 | River water | 1 | Jan 2026 – Jan 2026 | 61.4 mg/l 22 Jan 2026 |
| Iron, Dissolved 6460 | River water | 1 | Jan 2026 – Jan 2026 | 31 µg/l 22 Jan 2026 |
| Lead : BLM Bioavailable 3377 | River water | 1 | Jan 2026 – Jan 2026 | 0.04 µg/l 22 Jan 2026 |
| Lead, Dissolved 0052 | River water | 1 | Jan 2026 – Jan 2026 | below 0.1 µg/l 22 Jan 2026 |
| Lithium, Dissolved 4201 | River water | 1 | Jan 2026 – Jan 2026 | below 100 µg/l 22 Jan 2026 |
| Magnesium, Dissolved 0235 | River water | 1 | Jan 2026 – Jan 2026 | 4.6 mg/l 22 Jan 2026 |
| Manganese : BLM Bioavailable 4820 | River water | 1 | Jan 2026 – Jan 2026 | 1.7 µg/l 22 Jan 2026 |
| Manganese, Dissolved 6458 | River water | 1 | Jan 2026 – Jan 2026 | below 10 µg/l 22 Jan 2026 |
| Nickel : BLM Bioavailable 3878 | River water | 1 | Jan 2026 – Jan 2026 | 0.18 µg/l 22 Jan 2026 |
| Nickel, Dissolved 3410 | River water | 1 | Jan 2026 – Jan 2026 | below 0.5 µg/l 22 Jan 2026 |
| Nitrite as N 0118 | River water | 8 | Jan 2026 – Aug 2026 | below 0.004 mg/l 14 Aug 2026 |
| Nitrogen, Total as N 9686 | River water | 8 | Jan 2026 – Aug 2026 | 2.6 mg/l 14 Aug 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 8 | Jan 2026 – Aug 2026 | 2.2 mg/l 14 Aug 2026 |
| Phosphorus, Total as P 0348 | River water | 8 | Jan 2026 – Aug 2026 | 0.03 mg/l 14 Aug 2026 |
| Potassium, Dissolved 0209 | River water | 1 | Jan 2026 – Jan 2026 | 1.3 mg/l 22 Jan 2026 |
| Silica, reactive as SiO2 0182 | River water | 8 | Jan 2026 – Aug 2026 | 5.9 mg/l 14 Aug 2026 |
| Sodium, Dissolved 0205 | River water | 1 | Jan 2026 – Jan 2026 | 13 mg/l 22 Jan 2026 |
| Solids, Suspended at 105 C 0135 | River water | 8 | Jan 2026 – Aug 2026 | 3.3 mg/l 14 Aug 2026 |
| Strontium, Filtered 6693 | River water | 1 | Jan 2026 – Jan 2026 | 58 µg/l 22 Jan 2026 |
| Sulphate, Dissolved as SO4 7859 | River water | 1 | Jan 2026 – Jan 2026 | below 10 mg/l 22 Jan 2026 |
| Zinc : BLM Bioavailable 4822 | River water | 1 | Jan 2026 – Jan 2026 | 0.8 µg/l 22 Jan 2026 |
| Zinc, Dissolved 3408 | River water | 1 | Jan 2026 – Jan 2026 | 0.91 µg/l 22 Jan 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.