Benny Stream at Trewerry Mill
EA name: BENNY STREAM AT TREWERRY MILL
Environment Agency sampling point SW-82410610 · 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
- 30 Jun 2025, 11:0515 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
- 8 since 13 Nov 2024 Imported periods: 1 Oct 2023 – 8 Oct 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Planned investigation (local monitoring)
- Where
- National Grid 183723, 58023As published, to the nearest 1 m. Open in a map
- River, by its own name
- Benny Stream
- River, by the map
- An unnamed streamPlaced by position alone (the only river line close by), 1 m from the line.
- Next gauge downstream
- Gwills On the River Gannel · 1.8 km along the riverGWILLS 1.8 km along the river
- Why it was sampled
- Planned investigation (local monitoring) (8 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
96.3%
Sampled 30 Jun 2025, 15 months ago · 8 results banked
Every result (8)
| Sampled | Result as published | Reads as |
|---|---|---|
| 30 Jun 2025, 11:05 | 96.3 | 96.3% |
| 30 May 2025, 10:50 | 100.3 | 100.3% |
| 1 May 2025, 10:05 | 100.9 | 100.9% |
| 31 Mar 2025, 09:48 | 102.2 | 102.2% |
| 12 Feb 2025, 10:05 | 98.8 | 98.8% |
| 15 Jan 2025, 09:34 | 97.3 | 97.3% |
| 17 Dec 2024, 09:33 | 96.3 | 96.3% |
| 13 Nov 2024, 09:30 | 94.5 | 94.5% |
Water temperature
code 0076 · °C
15.2 °C
Sampled 30 Jun 2025, 15 months ago · 8 results banked
Every result (8)
| Sampled | Result as published | Reads as |
|---|---|---|
| 30 Jun 2025, 11:05 | 15.2 | 15.2 °C |
| 30 May 2025, 10:50 | 14.9 | 14.9 °C |
| 1 May 2025, 10:05 | 12.3 | 12.3 °C |
| 31 Mar 2025, 09:48 | 8.4 | 8.4 °C |
| 12 Feb 2025, 10:05 | 7.4 | 7.4 °C |
| 15 Jan 2025, 09:34 | 8.4 | 8.4 °C |
| 17 Dec 2024, 09:33 | 10.7 | 10.7 °C |
| 13 Nov 2024, 09:30 | 9.4 | 9.4 °C |
pH
code 0061
7.7
Sampled 30 Jun 2025, 15 months ago · 8 results banked
Every result (8)
| Sampled | Result as published | Reads as |
|---|---|---|
| 30 Jun 2025, 11:05 | 7.7 | 7.7 |
| 30 May 2025, 10:50 | 7.33 | 7.33 |
| 1 May 2025, 10:05 | 7.8 | 7.8 |
| 31 Mar 2025, 09:48 | 7.6 | 7.6 |
| 12 Feb 2025, 10:05 | 7.51 | 7.51 |
| 15 Jan 2025, 09:34 | 7.5 | 7.5 |
| 17 Dec 2024, 09:33 | 7.5 | 7.5 |
| 13 Nov 2024, 09:30 | 7.7 | 7.7 |
Conductivity
at 25 °C · code 0077 · µS/cm
307 µS/cm
Sampled 30 Jun 2025, 15 months ago · 8 results banked
Every result (8)
| Sampled | Result as published | Reads as |
|---|---|---|
| 30 Jun 2025, 11:05 | 307 | 307 µS/cm |
| 30 May 2025, 10:50 | 307 | 307 µS/cm |
| 1 May 2025, 10:05 | 300 | 300 µS/cm |
| 31 Mar 2025, 09:48 | 312 | 312 µS/cm |
| 12 Feb 2025, 10:05 | 317 | 317 µS/cm |
| 15 Jan 2025, 09:34 | 309 | 309 µS/cm |
| 17 Dec 2024, 09:33 | 312 | 312 µS/cm |
| 13 Nov 2024, 09:30 | 313 | 313 µS/cm |
Everything measured here
28 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 28 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 8 | Nov 2024 – Jun 2025 | 96.3% 30 Jun 2025 |
| Temperature of Water 0076 | River water | 8 | Nov 2024 – Jun 2025 | 15.2 °C 30 Jun 2025 |
| pH 0061 | River water | 8 | Nov 2024 – Jun 2025 | 7.7 30 Jun 2025 |
| Conductivity at 25 C 0077 | River water | 8 | Nov 2024 – Jun 2025 | 307 µS/cm 30 Jun 2025 |
| Barium, Dissolved 9446 | River water | 8 | Nov 2024 – Jun 2025 | below 10 µg/l 30 Jun 2025 |
| Boron, Dissolved 9447 | River water | 8 | Nov 2024 – Jun 2025 | below 100 µg/l 30 Jun 2025 |
| Cadmium 0108 | River water | 8 | Nov 2024 – Jun 2025 | 0.4 µg/l 30 Jun 2025 |
| Cadmium, Dissolved 0106 | River water | 8 | Nov 2024 – Jun 2025 | 0.36 µg/l 30 Jun 2025 |
| Calcium, Dissolved 0239 | River water | 8 | Nov 2024 – Jun 2025 | 22 mg/l 30 Jun 2025 |
| Carbon, Organic, Dissolved as C :- {DOC} 0301 | River water | 8 | Nov 2024 – Jun 2025 | 1.3 mg/l 30 Jun 2025 |
| Copper 6452 | River water | 8 | Nov 2024 – Jun 2025 | 1.5 µg/l 30 Jun 2025 |
| Copper, Dissolved 6450 | River water | 8 | Nov 2024 – Jun 2025 | 1.2 µg/l 30 Jun 2025 |
| Hardness, Total as CaCO3 0158 | River water | 8 | Nov 2024 – Jun 2025 | 92.8 mg/l 30 Jun 2025 |
| Iron, Dissolved 6460 | River water | 8 | Nov 2024 – Jun 2025 | 87 µg/l 30 Jun 2025 |
| Lead 0050 | River water | 8 | Nov 2024 – Jun 2025 | 11 µg/l 30 Jun 2025 |
| Lead, Dissolved 0052 | River water | 8 | Nov 2024 – Jun 2025 | 4.4 µg/l 30 Jun 2025 |
| Lithium, Dissolved 4201 | River water | 8 | Nov 2024 – Jun 2025 | below 100 µg/l 30 Jun 2025 |
| Magnesium, Dissolved 0235 | River water | 8 | Nov 2024 – Jun 2025 | 9.2 mg/l 30 Jun 2025 |
| Manganese, Dissolved 6458 | River water | 8 | Nov 2024 – Jun 2025 | 110 µg/l 30 Jun 2025 |
| Nickel 6462 | River water | 8 | Nov 2024 – Jun 2025 | 9.7 µg/l 30 Jun 2025 |
| Nickel, Dissolved 3410 | River water | 8 | Nov 2024 – Jun 2025 | 9 µg/l 30 Jun 2025 |
| Potassium, Dissolved 0209 | River water | 8 | Nov 2024 – Jun 2025 | 2.7 mg/l 30 Jun 2025 |
| Sodium, Dissolved 0205 | River water | 8 | Nov 2024 – Jun 2025 | 19 mg/l 30 Jun 2025 |
| Solids, Suspended at 105 C 0135 | River water | 8 | Nov 2024 – Jun 2025 | below 3 mg/l 30 Jun 2025 |
| Strontium, Filtered 6693 | River water | 8 | Nov 2024 – Jun 2025 | 100 µg/l 30 Jun 2025 |
| Sulphate, Dissolved as SO4 7859 | River water | 8 | Nov 2024 – Jun 2025 | 29 mg/l 30 Jun 2025 |
| Zinc 6455 | River water | 8 | Nov 2024 – Jun 2025 | 140 µg/l 30 Jun 2025 |
| Zinc, Dissolved 3408 | River water | 8 | Nov 2024 – Jun 2025 | 130 µg/l 30 Jun 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.