River Allen at Trevillick
EA name: RIVER ALLEN AT TREVILLICK (also listed as “RSN0099 TREVILLICK”)
Environment Agency sampling point SW-RSN0099 · 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
- 4 Feb 2026, 11:008 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 8 Oct 2026 and had nothing newer.
- Samples banked
- 2 since 7 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 206647, 79156As published, to the nearest 1 m. Open in a map
- River, by its own name
- Allen
- River, by the map
- River AllenPlaced on the river its name gives, 3 m from the line.
- Next gauge downstream
- Penvose On the River Allen · 2.3 km along the river
- Why it was sampled
- Monitoring (national agency policy) (2 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
99%
Sampled 4 Feb 2026, 8 months ago · 2 results banked
Every result (2)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Feb 2026, 11:00 | 99 | 99% |
| 7 Jan 2026, 10:24 | 97.8 | 97.8% |
Dissolved oxygen
as O2 · code 9924 · mg/l
11.2 mg/l
Sampled 4 Feb 2026, 8 months ago · 2 results banked
Every result (2)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Feb 2026, 11:00 | 11.2 | 11.2 mg/l |
| 7 Jan 2026, 10:24 | 11.5 | 11.5 mg/l |
Water temperature
code 0076 · °C
9.7 °C
Sampled 4 Feb 2026, 8 months ago · 2 results banked
Every result (2)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Feb 2026, 11:00 | 9.7 | 9.7 °C |
| 7 Jan 2026, 10:24 | 8.1 | 8.1 °C |
pH
code 0061
7.8
Sampled 4 Feb 2026, 8 months ago · 2 results banked
Every result (2)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Feb 2026, 11:00 | 7.8 | 7.8 |
| 7 Jan 2026, 10:24 | 7.36 | 7.36 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.02 mg/l
Sampled 4 Feb 2026, 8 months ago · 2 results banked
Every result (2)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Feb 2026, 11:00 | 0.02 | 0.02 mg/l |
| 7 Jan 2026, 10:24 | 0.02 | 0.02 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
4.09 mg/l
Sampled 4 Feb 2026, 8 months ago · 2 results banked
Every result (2)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Feb 2026, 11:00 | 4.09 | 4.09 mg/l |
| 7 Jan 2026, 10:24 | 4.39 | 4.39 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.024 mg/l
Sampled 4 Feb 2026, 8 months ago · 2 results banked
Every result (2)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Feb 2026, 11:00 | 0.024 | 0.024 mg/l |
| 7 Jan 2026, 10:24 | 0.02 | 0.02 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
182 µS/cm
Sampled 4 Feb 2026, 8 months ago · 2 results banked
Every result (2)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Feb 2026, 11:00 | 182 | 182 µS/cm |
| 7 Jan 2026, 10:24 | 263 | 263 µS/cm |
Everything measured here
19 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 19 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 2 | Jan 2026 – Feb 2026 | 99% 4 Feb 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 2 | Jan 2026 – Feb 2026 | 11.2 mg/l 4 Feb 2026 |
| Temperature of Water 0076 | River water | 2 | Jan 2026 – Feb 2026 | 9.7 °C 4 Feb 2026 |
| pH 0061 | River water | 2 | Jan 2026 – Feb 2026 | 7.8 4 Feb 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 2 | Jan 2026 – Feb 2026 | 0.02 mg/l 4 Feb 2026 |
| Nitrate as N 0117 | River water | 2 | Jan 2026 – Feb 2026 | 4.09 mg/l 4 Feb 2026 |
| Orthophosphate, reactive as P 0180 | River water | 2 | Jan 2026 – Feb 2026 | 0.024 mg/l 4 Feb 2026 |
| Conductivity at 25 C 0077 | River water | 2 | Jan 2026 – Feb 2026 | 182 µS/cm 4 Feb 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 2 | Jan 2026 – Feb 2026 | 43 mg/l 4 Feb 2026 |
| Ammonia un-ionised as N 0119 | River water | 2 | Jan 2026 – Feb 2026 | 0.00023 mg/l 4 Feb 2026 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 2 | Jan 2026 – Feb 2026 | 1.2 mg/l 4 Feb 2026 |
| Chloride 0172 | River water | 2 | Jan 2026 – Feb 2026 | 23 mg/l 4 Feb 2026 |
| Flow Type 2896 | River water | 2 | Jan 2026 – Feb 2026 | High Flow 4 Feb 2026 |
| GCMS Screen : Target Based multi-residue screening : Semi Quantitative 4994 | River water | 1 | Jan 2026 – Jan 2026 | 1 text result 7 Jan 2026 |
| Nitrite as N 0118 | River water | 2 | Jan 2026 – Feb 2026 | 0.0078 mg/l 4 Feb 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 2 | Jan 2026 – Feb 2026 | 4.1 mg/l 4 Feb 2026 |
| Phosphorus, Total as P 0348 | River water | 2 | Jan 2026 – Feb 2026 | 0.041 mg/l 4 Feb 2026 |
| Silica, reactive as SiO2 0182 | River water | 2 | Jan 2026 – Feb 2026 | 15 mg/l 4 Feb 2026 |
| Solids, Suspended at 105 C 0135 | River water | 2 | Jan 2026 – Feb 2026 | 9 mg/l 4 Feb 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.